Agilent Technologies Low-Profile Modular Power System Series N6700 Service Guide
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Safety Notices The following general safety precautions must be observed during all phases of operation of this instrument. Failure to comply with these precautions or with specific warnings or instructions elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies assumes no liability for the customer's failure to comply with these requirements. General Do not use this product in any manner not specified by the manufacturer.
Contents 1 - Introduction ...................................................................................................................................... 5 Returning an Instrument .................................................................................... 6 Instrument Identification.................................................................................... 6 Firmware Upgrade ...............................................................................................
1 Introduction Returning an Instrument .................................................................................... 6 Instrument Identification.................................................................................... 6 Firmware Upgrade ............................................................................................... 7 This manual discusses the troubleshooting procedures for the N6700B, N6701A, and N6702A MPS mainframes.
1 Introduction Returning an Instrument Before returning your instrument to Agilent Technologies for service or repair, perform the “Preliminary Checkout” procedures in the beginning of chapter 4. Warranty Repair If your instrument fails during the warranty period, Agilent Technologies will replace or repair it free of charge. After your warranty expires, Agilent Technologies will replace or repair it at a competitive price. The standard repair process is “whole unit exchange”.
Introduction 1 Additional Information For Agilent N6700 MPS mainframes, you can query the model number, serial number, firmware revision, backup and active firmware. For power modules, you can query the model number, serial number, installed options, voltage, current and power rating. Front Panel: SCPI Command: Select System\About\Frame.
2 Performance Verification Verification Description .................................................................................... 10 Verification Procedure ...................................................................................... 13 Test Record Forms ............................................................................................
2 Performance Verification Verification Description Verification and Calibration Equipment Required The equipment listed in the following table, or the equivalent to this equipment, is required for the performance tests and for calibration. Test record sheets are included at the back of this section. 10 Type Specifications Recommended Model Digital Multimeter Resolution: 10 nV @ 1V; Readout: 8 1/2 digits Accuracy: 20 ppm Agilent 3458A or equivalent Current Monitor 15 A (0.
Performance Verification 2 Measurement Techniques Voltmeter To ensure that the values read by the voltmeter during both the verification procedure and the calibration procedure are not affected by the instantaneous measurement of the AC peaks of the output current ripple, make several DC measurements and average them. If you are using an Agilent 3458A DMM, you can set up the voltmeter to do this automatically. From the instrument’s front panel, program 100 power line cycles per measurement.
2 Performance Verification Verification Test Set-up The following figures show the verification test set-ups. Connect all leads to the output terminals as shown in the following figure. Twist the + and - load leads to reduce noise and inductance. +S + -S +S + + -S +S -S Current shunt DC voltmeter Electronic load or resistor 50 A. + + + Electronic load, fixed resistor, or N6782A in CC load mode B. + -S C.
Performance Verification 2 Verification Procedure Constant Voltage Tests NOTE Test each output channel individually. Refer to the appropriate test record form for the instrument settings of the model you are checking. Voltage Programming and Readback Accuracy Test category = performance, calibration This test verifies that the voltage programming and measurement functions are within specifications.
2 Performance Verification Test category = performance This test measures the change in output voltage resulting from a change in output current from full load to no load. 1 Turn off the power system and connect a DMM and an electronic load (see Test Setup A). 2 Turn on the power system and program the instrument settings as described in the test record form under “CV Load Effect”. 3 Set the electronic load for the output channel’s current as described in the test record form under “CV Load Effect”.
Performance Verification 2 CV Ripple and Noise Test category = performance Periodic and random deviations in the output combine to produce a residual AC voltage superimposed on the DC output voltage. This residual voltage is specified as the rms or peak-to-peak noise in the frequency range specified in the Agilent N6700 Modular Power System Family Specifications Guide.
2 Performance Verification Transient Recovery Time (all except N678xA SMU and N6783A) Test category = performance This test measures the time for the output voltage to recover to within the specified value following a 50% change in the load current. 1 Turn off the power system and connect an oscilloscope across the sense terminals (see Test Setup A). Connect an electronic load to the output terminals.
Performance Verification 2 3 Set the N6784A that is being used as the load as follows: a. Emulation Mode = CC Load (in current priority mode) b. + Voltage limit = 6.12 V c. Current Slew setting: N678xA: Maximum (the default) N6783A: 67500 A/s (for a pulse rise/fall time of 20 µs) d. Arb = Current Pulse e. Load pulse properties: N678xA: I0= −0.1 A; I1= −1.5A; T0= 1ms; T1= 1ms; T2= 1ms N6783A: I0= −0.15A; I1= −1.5A; T0= 0.5ms; T1= 0.5ms; T2= 0.5ms f. Continuous = ON g. Press Arb run.
2 Performance Verification Constant Current Tests NOTE Test each output channel individually. Refer to the appropriate test record form for the instrument settings of the model you are checking. Current Programming and Readback Accuracy Test category = performance, calibration This test verifies that the current programming and measurement functions are within specifications. 18 1 Turn off the power system and connect the current shunt directly across the output terminals.
Performance Verification 2 “Current Readback, 200 μA Current”. Record the current reading of the Agilent 3458A and the current measured over the interface. Readings should be within limits specified for the appropriate model under “Current Readback, 200μA Range”. 8 For models N6763A–N6766A, and N6783A only. Set the current measurement to the low range. Set the instrument as described under “Current Readback, Low Current”. Repeat step 5. Record the current measured over the interface.
2 Performance Verification CC Load Effect Test category = performance This test measures the change in output current resulting from a change in output voltage from full scale to short circuit. 1 Turn off the power system and connect the current shunt, DMM, and electronic load (see Test Setup B). Connect the DMM directly across the current shunt. 2 Turn on the power system and program the instrument settings as described in the test record under “CC Load Effect”.
Performance Verification 2 5 Adjust the AC input to the lowest rated line voltage (86 VAC). 6 Divide the voltage drop (DMM reading) across the current monitoring resistor by its resistance to convert to amps and record this value (Iout). 7 Adjust the AC input to the highest rated line voltage (264 VAC). 8 Divide the voltage drop (DMM reading) across the current monitoring resistor by its resistance to convert to amps and record this value (Iout).
2 Performance Verification Test Record Forms Test Record Form – Agilent N6731B and N6741B Agilent N6731B and N6741B Description Report No _______________ Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface Both Both − 4 mV Vout − 20 mV __________ __________ + 34 mV Vout + 20 mV High Voltage Vout Voltage measured over interface Both Both 4.
Performance Verification 2 Test Record Form – Agilent N6732B and N6742B Agilent N6732B and N6742B Description Report No _______________ Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface Both Both − 4 mV Vout − 20 mV __________ __________ + 34 mV Vout + 20 mV High Voltage Vout Voltage measured over interface Both Both 7.973 V Vout − 28 mV __________ __________ 8.
2 Performance Verification Test Record Form – Agilent N6733B and N6743B Agilent N6733B and N6743B Description Report No _______________ Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface Both Both + 10 mV Vout − 20 mV __________ __________ + 50 mV Vout + 20 mV High Voltage Vout Voltage measured over interface Both Both 19.96 V Vout − 40 mV __________ __________ 20.
Performance Verification 2 Test Record Form – Agilent N6734B and N6744B Agilent N6734B and N6744B Description Report No _______________ Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface Both Both + 5 mV Vout − 35 mV __________ __________ + 75 mV Vout + 35 mV High Voltage Vout Voltage measured over interface Both Both 34.93 V Vout − 70 mV __________ __________ 35.
2 Performance Verification Test Record Form – Agilent N6735B and N6745B Agilent N6735B and N6745B Description Report No _______________ Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface Both Both + 10 mV Vout − 60 mV __________ __________ + 130 mV Vout + 60 mV High Voltage Vout Voltage measured over interface Both Both 59.88 V Vout − 120 mV __________ __________ 60.
Performance Verification 2 Test Record Form – Agilent N6736B and N6746B Agilent N6736B and N6746B Description Report No _______________ Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface Both Both 0 mV Vout − 100 mV __________ __________ + 200 mV Vout + 100 mV High Voltage Vout Voltage measured over interface Both Both 99.8 V Vout − 200 mV __________ __________ 100.
2 Performance Verification Test Record Form – Agilent N6751A and N6752A Agilent N6751A and N6752A Description Report No _______________ Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface Both Both + 1 mV Vout − 20 mV __________ __________ + 39 mV Vout + 20 mV High Voltage Vout Voltage measured over interface Both Both 49.951 V Vout − 45 mV __________ __________ 50.
Performance Verification 2 Test Record Form – Agilent N6753A and N6755A Agilent N6753A and N6755A Description Report No _______________ Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface Both Both 0 mV Vout − 10 mV __________ __________ + 20 mV Vout + 10 mV High Voltage Vout Voltage measured over interface Both Both 19.978 V Vout −20 mV __________ __________ 20.
2 Performance Verification Test Record Form – Agilent N6754A and N6756A Agilent N6754A and N6756A Description Report No _______________ Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface Both Both 0 mV Vout − 25 mV __________ __________ + 50 mV Vout + 25 mV High Voltage Vout Voltage measured over interface Both Both 59.939 V Vout − 55 mV __________ __________ 60.
Performance Verification 2 Test Record Form – Agilent N6761A and N6762A Agilent N6761A and N6762A Description Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface High Voltage Vout Voltage measured over interface Low Range Voltage Prog.
2 Performance Verification Test Record Form – Agilent N6763A and N6765A Agilent N6763A and N6765A Description Report No _______________ Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface Both Both + 5 mV Vout − 10 mV __________ __________ + 15 mV Vout + 10 mV High Voltage Vout Voltage measured over interface Low Voltage measured over interface Both Both Both 19.
Performance Verification 2 Test Record Form – Agilent N6764A and N6766A Agilent N6764A and N6766A Description Report No _______________ Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface High Voltage Vout Voltage measured over interface Low Voltage measured over interface CV Load Effect CV Source Effect Both Both Both Both Both + 13 mV Vout − 25 mV 59.
2 Performance Verification Test Record Form – Agilent N6773A Agilent Model N6773A Report No _______________ Description Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface + 10 mV Vout − 20 mV __________ __________ + 50 mV Vout + 20 mV High Voltage Vout Voltage measured over interface 19.96 V Vout − 40 mV __________ __________ 20.
Performance Verification 2 Test Record Form – Agilent N6774A Agilent Model N6774A Report No _______________ Description Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface + 5 mV Vout − 35 mV __________ __________ + 75 mV Vout + 35 mV High Voltage Vout Voltage measured over interface 34.93 V Vout − 70 mV __________ __________ 35.
2 Performance Verification Test Record Form – Agilent N6775A Agilent Model N6775A Report No _______________ Description Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface + 10 mV Vout − 60 mV __________ __________ + 130 mV Vout + 60 mV High Voltage Vout Voltage measured over interface 59.88 V Vout − 120 mV __________ __________ 60.
Performance Verification 2 Test Record Form – Agilent N6776A Agilent Model N6776A Report No _______________ Description Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface 0 mV Vout − 100 mV __________ __________ + 200 mV Vout + 100 mV High Voltage Vout Voltage measured over interface 99.8 V Vout − 200 mV __________ __________ 100.
2 Performance Verification Test Record Form – Agilent N6777A Agilent Model N6777A Report No _______________ Description Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface 0 mV Vout − 150 mV __________ __________ + 300 mV Vout + 150 mV High Voltage Vout Voltage measured over interface 149.7 V Vout − 300 mV __________ __________ 150.
Performance Verification 2 Test Record Form – Agilent N6781A, N6782A, and N6784A SMU Agilent N6781A, N6782A and N6784A Report No _______________ Description Model Minimum Specs. Date __________________ Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface All All − 1.8 mV Vout − 1.2 mV __________ __________ + 1.8 mV Vout + 1.2 mV High Voltage Vout Voltage measured over interface All All 19.9932 V Vout − 6.
2 Performance Verification Agilent N678xA SMU Test Record Card (continued) Constant Current Tests - continued CC Load Effect 3 A output range 1 A output range 300 mA output range 100 mA & 10 mA output ranges All All N6781/82A N6784A − 100 μA − 50 μA − 50 μA − 5 μA __________ __________ __________ __________ + 100 μA + 50 μA + 50 μA + 5 μA All − 60 μA __________ + 60 μA __________ __________ 1.004 Ω 1.
Performance Verification 2 Test Record Form – Agilent N6783A-BAT and N6783A-MFG Agilent N6783A-BAT, N6783A-MFG Report No _______________ Description Model Date __________________ Minimum Specs. Results Maximum Specs. Constant Voltage Tests Voltage Programming & Readback Minimum Voltage Vout Voltage measured over interface High Voltage Vout Voltage measured over interface Both Both N6783A-BAT N6783A-MFG N6783A-BAT N6783A-MFG +5 mV Vout − 5 mV 7.982 V 5.
3 Calibration Calibration Description ..................................................................................... 44 Calibration Procedure – Models N673xB, N674xB, N677xA ..................... 46 Calibration Procedure – Models N675xA ...................................................... 49 Calibration Procedure – Models N676xA ...................................................... 53 Calibration Procedure – Models N678xA SMU ............................................
3 Calibration Calibration Description Refer to the “Equipment Required” section in chapter 2 for a list of the equipment required for calibration. Also refer to “Measurement Techniques” for information about connecting the voltmeter and current shunt. Additional information about calibration follows: The correct password is required to enter the Admin menu, which contains the calibration function. The password is factoryset to 0 (zero).
Calibration 3 Calibration Set-up The following figures show the calibration test set-ups. Connect all leads to the output terminals as shown in the following figure. Twist the + and - load leads to reduce noise and inductance. +S + -S +S + -S +S + +S -S + -S + Agilent 3458A configured as a voltmeter + Agilent 3458A configured as a voltmeter A. Current shunt 25 Ohm resistor (not used for Models N6753A & N6754A) + Agilent 3458A configured as an ammeter +S +LS -LS -S B. D. C.
3 Calibration Calibration Procedure – Models N673xB, N674xB, N677xA Enter Calibration mode Front Panel: Select System\Admin\Login. SCPI Command: CAL:STAT ON, Enter your password in the Password field and press Select. Voltage Calibration High Range Programming and Measurement Step 1. Connect the voltage input of the Agilent 3458A DMM to an output channel (see Cal Setup A). Step 2. Select the full-scale voltage programming and measurement range.
Calibration 3 Step 6. Measure the output voltage with the DMM and enter the data. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. Press Next to finish calibration. SCPI Command: CAL:DATA Current Calibration High Range Programming and Measurement The output voltage may go negative at some point during this procedure on units that have polarity reversal relays (Option 760). Step 1. Connect a precision shunt resistor to the output.
3 Calibration Step 6. Calculate the shunt current (I=V/R) and enter the data. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. Press Next to finish calibration. SCPI Command: CAL:DATA Enter a Calibration Date Front Panel: SCPI Command: Select System\Admin\Cal\Date. Enter the calibration date in the Date field. If desired, you can enter alphanumeric data in this field.
Calibration 3 Calibration Procedure – Models N675xA Enter Calibration mode Front Panel: Select System\Admin\Login. SCPI Command: CAL:STAT ON, Enter your password in the Password field and press Select. Voltage Calibration High Range Programming and Measurement Step 1. Connect the voltage input of the Agilent 3458A DMM to an output channel (see Cal Setup A). Step 2. Select the full-scale voltage programming and measurement range.
3 Calibration Step 6. Measure the output voltage with the DMM and enter the data. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. Press Next to finish calibration. SCPI Command: CAL:DATA Voltage Common Mode Rejection Ratio Calibration Step 1. For this step, make the connections shown in Cal Setup C. Connect an external jumper between the +sense and the −sense terminals. Connect a second jumper from the +output to the −sense terminal.
Calibration 3 Step 4. Calculate the shunt current (I=V/R) and enter the data. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. SCPI Command: CAL:DATA Step 5. Select the second current calibration point. Front Panel: SCPI Command: CAL:LEV P2 *OPC? Select Next. The information field should indicate: “Enter P2 measured data” Step 6. Calculate the shunt current (I=V/R) and enter the data. Front Panel: Select the Measured Data field.
3 Calibration Step 4. Set the electronic load or connect the appropriate resistor for the second calibration point. Step 5. Select the second current calibration point. Front Panel: SCPI Command: CAL:LEV P2 *OPC? Select Next. The calibration is automatic. Downprogrammer Calibration Step 1. Remove all loads from the output. This procedure is automatic and takes a few seconds. Front Panel: Select System\Admin\Cal\Misc\Dprog. Then select Next.
Calibration 3 Calibration Procedure – Models N676xA Warm-up Period for Models N6761A and N6762A Models N6761A and N6762A require a 30-minute warm-up period in the reset (*RST) state before starting calibration. Enter Calibration mode Front Panel: Select System\Admin\Login. SCPI Command: CAL:STAT ON, Enter your password in the Password field and press Select. Voltage Calibration High Range Programming and Measurement Step 1.
3 Calibration Step 6. Measure the output voltage with the DMM and enter the data. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. Press Next to finish calibration. SCPI Command: CAL:DATA Low Range Voltage Programming Step 1. Select the low-voltage programming range. The value entered must be the maximum voltage of the range to be calibrated. This example selects the 5 V range of output 1. Front Panel: Select System\Admin\Cal\Volt\Vprog.
Calibration 3 Low Range Voltage Measurement Step 1. Select the low-voltage measurement range. The value entered must be the maximum voltage of the range to be calibrated. This example selects the 5 V measurement range of output 1. Front Panel: Select System\Admin\Cal\Volt\Vmeas. Then select the Low1 range. SCPI Command: CAL:VOLT:MEAS 5, (@1) Step 2. Select the first voltage calibration point. Front Panel: Select Next.
3 Calibration Current Calibration High Range Programming and Measurement The output voltage may go negative at some point during this procedure on units that have polarity reversal relays (Option 760). Step 1. Connect a precision shunt resistor to the output. The shunt resistor should be able to measure at least 120% of the output’s full-scale current (see Cal Setup B). Connect the Agilent 3458A across the shunt resistor. Step 2. Select the full-scale current programming range.
Calibration 3 Low Range Current Programming Step 1. Connect only the current measurement terminals of the Agilent 3458A to the output terminals. Step 2. Select the low-current programming range. The value to program a range must be the maximum current of the range. This example selects the 100 mA range of output 1. Front Panel: Select System\Admin\Cal\Curr\Iprog. Then select the Low1 range. SCPI Command: CAL:CURR 0.1, (@1) Step 3. Select the first current calibration point.
3 Calibration Low Range Current Measurement Step 1. Connect only the current measurement terminals of the Agilent 3458A to the output terminals. Step 2. Select the low-current measurement range. The value to program a range must be the maximum current of the range. This example selects the 100 mA range of output 1. Front Panel: Select System\Admin\Cal\Curr\Imeas Then select the Low1 range. SCPI Command: CAL:CURR:MEAS 0.1, (@1) Step 3. Select the first current calibration point.
Calibration 3 100 uA/200 uA Range Measurement - for Option 1UA or 2UA only Step 1. Remove all loads from the output. Leave the sense terminals connected to the output terminals. Step 2. Select either the 100 µA current measurement range or the 200 µA measurement range. Then wait 10 seconds. Front Panel: Select System\Admin\Cal\Curr\Imeas Then select the Low2 range. SCPI Command: CAL:CURR:MEAS 0.0001, (@1) *OPC? or CAL:CURR:MEAS 0.0002, (@1) *OPC? Step 3. Select the first current calibration point.
3 Calibration Step 3 Select the first current calibration point. Front Panel: SCPI Command: CAL:LEV P1 *OPC? Select Next. The calibration is automatic. Step 4. Set the electronic load or connect the appropriate resistor for the second calibration point. Step 5. Select the second current calibration point. Front Panel: SCPI Command: CAL:LEV P2 *OPC? Select Next. The calibration is automatic. Downprogrammer Calibration Step 1. Remove all loads from the output.
Calibration 3 Calibration Procedure – Models N678xA SMU Enter Calibration mode Front Panel: Select System\Admin\Login. SCPI Command: CAL:STAT ON, Enter your password in the Password field and press Select. Voltage Calibration High Range Programming and Measurement Step 1. Connect the voltage input of the Agilent 3458A to an output channel (see Cal Setup A). Step 2. Select the full-scale voltage programming and measurement range.
3 Calibration Step 6. Measure the output voltage with the DMM and enter the data. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. Press Next to finish calibration. SCPI Command: CAL:DATA Steps 7 and 8 only apply to model N6784A. Step 7. Select the third voltage calibration point for the negative range. Front Panel: Select Next. The information field should indicate: “Enter P3 measured data” SCPI Command: CAL:LEV P3 *OPC? Step 8.
Calibration 3 Step 4. Select the second voltage calibration point. Front Panel: SCPI Command: CAL:LEV P2 *OPC? Select Next. The information field should indicate: “Enter P2 measured data” Step 5. Measure the output voltage with the DMM and enter the data. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. Press Next to finish calibration. SCPI Command: CAL:DATA Step 6 only applies to models N6781A and N6782A. Step 6.
3 Calibration Step 2. Select the first voltage calibration point. Front Panel: Select Next. The information field should indicate: “Enter P1 measured data” SCPI Command: CAL:LEV P1 *OPC? Step 3. Measure the output voltage with the DMM and enter the data. This value may be positive or negative. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. SCPI Command: CAL:DATA Step 4. Select the second voltage calibration point.
Calibration 3 Positive Voltage Limit Step 1. Select the positive voltage limit range. The value to program a range must be the maximum voltage of the range to be calibrated. This example selects the 20 V positive limit range of output 1. Front Panel: Select System\Admin\Cal\Volt\Vlim Then select the High range. SCPI Command: CAL:VOLT:LIM:POS 20, (@1) Step 2. Select the first voltage calibration point. Front Panel: Select Next.
3 Calibration Auxiliary Voltage Measurement - Model N6781A Step 1. Connect the auxiliary input terminals to the output terminals of model N6781A. Also connect the voltage input of the Agilent 3458A to the output terminals of model N6781A (see Cal Setup E). Step 2. Select the auxiliary voltage measurement input. Front Panel: Select System\Admin\Cal\Volt\Vmeas Then select the Aux voltage range. SCPI Command: CAL:VOLT:MEAS:AUX (@1) Step 3. Select the first voltage calibration point.
Calibration 3 Current Calibration High Range Programming and Measurement Do not connect anything to the Sense terminals. Step 1. Connect a precision shunt resistor to the output. The shunt resistor should be able to measure at least 120% of the output’s rated fullscale current (see Cal Setup B). Connect the Agilent 3458A across the shunt resistor. Step 2. Select the full-scale current programming range. The value to program a range must be the maximum current of the range.
3 Calibration Step 7. Select the third voltage calibration point for the negative range. Front Panel: SCPI Command: CAL:LEV P3 *OPC? Select Next. The information field should indicate: “Enter P3 measured data” Step 8. Calculate the shunt current (I=V/R) and enter the data. The value should be negative. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. Press Next to finish calibration.
Calibration 3 Step 6. Measure the current with the Agilent 3458A and enter the value. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. SCPI Command: CAL:DATA Step 7. Select the third current calibration point for the negative range. Front Panel: Select Next. The information field should indicate: “Enter P3 measured data” SCPI Command: CAL:LEV P3 *OPC? Step 8. Measure the current with the Agilent 3458A and enter the value.
3 Calibration Step 5. Select the second current calibration point. Front Panel: Select Next. The information field should indicate: “Enter P2 measured data” SCPI Command: CAL:LEV P2 *OPC? Step 6. Measure the current with the Agilent 3458A and enter the value. This value should be negative. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. Press Next to finish calibration. SCPI Command: CAL:DATA 1 mA Measurement Range Step 1.
Calibration 3 10 μA Measurement Range Step 1. Connect the Agilent 3458A in series with a 1 MΩ resistor to the output (see equipment list in chapter 2 and Cal Setup D). Set the Agilent 3458A to measure current using the 100 μA range (no autoranging). The remote command to do this is “DCI 100e-6”. Step 2. Select the 10 μA measurement range of output 1. Front Panel: Select System\Admin\Cal\Curr\Imeas Then select the Low3 range. SCPI Command: CAL:CURR:MEAS 0.00001, (@1) Step 3.
3 Calibration Positive Current Limit Step 1. Connect a precision shunt resistor to the output. The shunt resistor should be able to measure at least 120% of the output’s rated fullscale current (see Cal Setup B). Connect the Agilent 3458A across the shunt resistor. Step 2. Select the 3 A positive limit range of output 1. Front Panel: Select System\Admin\Cal\Curr\Ilim. SCPI Command: CAL:CURR:LIM:POS 3, (@1) Step 3. Select the first current calibration point. Front Panel: Select Next.
Calibration 3 Resistance Calibration Step 1. Connect an electronic load directly to the N6781A output (see Cal Setup F). Set the load to constant current mode, current to 0.95A. Also connect the Agilent 3458A to the N6781A output terminals. Step 2. Select the 20 V resistance range of output 1. Front Panel: Select System\Admin\Cal\Misc\Resistance. Then select the High range. SCPI Command: CAL:RES 20 (@1) *OPC? Step 3. Select the first resistance calibration point. Front Panel: Select Next.
3 Calibration Enter a Calibration Date Front Panel: SCPI Command: Select System\Admin\Cal\Date. Enter the calibration date in the Date field. If desired, you can enter alphanumeric data in this field. To enter a calibration date: CAL:DATE “”, (@1) Save and Log out of Calibration Mode CAUTION 74 Storing calibration constants overwrites the existing ones in non-volatile memory.
Calibration 3 Calibration Procedure – Models N6783A-BDA and -MFG Enter Calibration mode Front Panel: Select System\Admin\Login. SCPI Command: CAL:STAT ON, Enter your password in the Password field and press Select. Voltage Calibration High Range Programming and Measurement Step 1. Connect the voltage input of the Agilent 3458A DMM to an output channel (see Cal Setup A). Step 2. Select the full-scale voltage programming and measurement range.
3 Calibration Step 6. Measure the output voltage with the DMM and enter the data. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. Press Next to finish calibration. SCPI Command: CAL:DATA Current Calibration High Range Programming and Measurement The output voltage may go negative at some point during this procedure on units that have polarity reversal relays (Option 760). Step 1. Connect a precision shunt resistor to the output.
Calibration 3 Step 6. Calculate the shunt current (I=V/R) and enter the data. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. Press Next to finish calibration. SCPI Command: CAL:DATA Low Range Current Measurement Step 1. Connect only the current measurement terminals of the Agilent 3458A to the output terminals (see Cal Setup D without the resistor). Step 2. Select the low current measurement range.
3 Calibration Step 3. Select the first current calibration point. Front Panel: SCPI Command: CAL:LEV P1 *OPC? Select Next. The information field should indicate: “Enter P1 measured data” Step 4. Calculate the shunt current (I=V/R); enter the negative current value. Front Panel: Select the Measured Data field. Enter the data from the external DMM. Press Select when done. SCPI Command: CAL:DATA Step 5. Select the second current calibration point.
Calibration 3 Change the Admin/Calibration Password The password must be numeric, and can be up to 15 digits in length. After it has been changed, you can only enter the calibration mode by providing the correct password. If the password is lost or forgotten, access can be restored by setting an internal switch that resets the password to zero (refer to “Accessing the Calibration switch” in chapter 4).
4 Disassembly Electrostatic Discharge (ESD) Precautions................................................... 82 Disassembly Procedures .................................................................................. 82 Installing a Redundant Ground for 400 Hz Operation ................................. 87 This chapter discusses the disassembly procedures for troubleshooting and repairing Agilent N6700B, N6701A, and N6702A MPS mainframes.
4 Disassembly Electrostatic Discharge (ESD) Precautions Almost all electrical components can be damaged by electrostatic discharge (ESD) during handling. Component damage can occur at electrostatic discharge voltages as low as 50 volts. The following guidelines will help prevent ESD damage when servicing the instrument or any electronic device. Disassemble instruments only in a static-free work area. Use a conductive work area to reduce static charges.
Disassembly 4 Removing/Installing Modules CAUTION Modules must be installed next to one another, starting with slot 1. Do not leave any empty slots between modules, otherwise the power system will not operate. Any remaining unused slots must have a filler module installed to ensure proper cooling. Do not install filler modules between power modules. Step 1. Remove the blower cover. Remove three screws from the top of the cover and two screws on the sides. Tilt the cover up and slide it out. Step 2.
4 Disassembly Step 3. To install a module, align the module over the alignment pins, and push it down onto the mainframe connector. Step 4. Fasten the module to the mainframe. Install the two screws from the power module or filler module at either end of the module. Because the RFI strips are applying upward pressure, continue pushing down on the module until the screws are fully tightened. Step 5. Replace the blower cover when finished. Accessing the Calibration switch Step 1. Remove the blower cover.
Disassembly 4 Removing/Installing the Interface (PPMC) board Step 1. Remove the blower cover. Remove three screws from the top of the cover and two screws on the sides. Tilt the cover up and slide it out. Step 2. Remove the interface cover. Remove the three screws along the left side of the unit. Then remove the screw at the front of the cover. Lift off the cover. Step 3. Use a hex wrench to remove the GPIB connector from the rear of the mainframe Disconnect all cable assemblies from the interface board.
4 Disassembly Step 5. To remove the front panel board, remove the six screws that secure the board to the front frame assembly. Step 6. To remove the display module, first disconnect the cable at the P1 connector and the ribbon cable at the J2 connector. Then untwist the tabs that hold the display module to the front panel board. Step 7. To reinstall the front panel assembly, perform the above steps in reverse order. Removing/Installing the Bulk Supply Step 1.
Disassembly 4 Installing a Redundant Ground for 400 Hz Operation Operation at 400 Hz requires the installation of a redundant ground from the instrument chassis to earth ground. The redundant ground must be permanently attached to the unit as well as to the earth ground point. The following procedure only describes how to make the permanent connection at the unit. The user must ensure the integrity and permanence of the connection at the earth ground point.
5 Troubleshooting Preliminary Checkout ........................................................................................ 90 Overall Troubleshooting ................................................................................... 91 Front Panel Troubleshooting ........................................................................... 94 Bias Board Troubleshooting ............................................................................ 94 Backplane Board Troubleshooting ........................
5 Troubleshooting Preliminary Checkout Is the instrument inoperative? Verify that the AC power cord is connected to the instrument. Verify that the front-panel On/Standby switch has been pushed. Is the display working? If the display is hard to read, but front-panel LED is lit and the fans are working, the display contrast setting may be too light or too dark. Use the front panel menu to set the display contrast.
Troubleshooting 5 Overall Troubleshooting Start Turn on unit and observe the display. After a few seconds it will display the Agilent logo and the GPIB address. After self- test, it should either display an error or go to metering mode. Is the fan running? NO NOTE: To troubleshoot the bulk supply on N6702A mainframes, disconnect the DC cables and the current sharing cable. Check each bulk supply individually. YES Is there a strange noise? Check the line switch.
5 Troubleshooting From Sheet 1 Single output failure? YES Perform verification procedures in Service guide. Calibrate the output if required. Replace the power module. YES Perform verification procedures in Service guide. Calibrate the output if required. Replace the power module. YES Perform verification procedures in Service guide. Calibrate the output if required. Replace the power module. YES Perform verification procedures in Service guide. Calibrate the output if required.
Troubleshooting 5 From Sheet 2 Remote sense not working? YES Check remote sense connections. Replace the power module. YES Replace the power module. YES Replace the power module. YES Check that power module contains correct options. Check for latest firmware revision and update if required Replace the power module. YES Perform bias assembly troubleshooting. Replace interface assembly. YES Check for latest firmware revision and update if required Replace interface assembly.
5 Troubleshooting Front Panel Troubleshooting Troubleshooting the front panel board involves checking for the presence of the correct bias voltages on the board. Refer to the following table and figure. Test Point Location Voltage Action TP 1 BKL_VCC +12 V If bias not present, troubleshoot the bias board or replace the front panel board. TP 2 P1 pin 3 +12 V If backlight voltage not present, replace the front panel board. If voltage is present and the display is not lit, replace the display.
Troubleshooting 5 Backplane Board Troubleshooting Troubleshooting the backplane board consists of visually inspecting the pins and pin connections. If there are missing or broken pins, replace the board. If there are bent pins, carefully try to straighten the pin. If you are unsuccessful, replace the board. Closely examine the solder connections at the pins. If there are cracks in the solder, carefully re-solder the connector. If unsuccessful, replace the board.
5 Troubleshooting Calibration and Passwords Calibration is not required after the mainframe has been repaired. All calibration information is module-specific and resides in each power module. However, if the A5 board that contains the calibration switches has been replaced, any calibration password that has been set will be lost. Passwords that are used to prevent access to the front panel Admin menu will also be lost.
6 Replaceable Parts Parts List ............................................................................................................. 98 Parts Location Diagrams .................................................................................. 99 The following table documents the replaceable parts assembles.
6 Replaceable Parts Parts List Reference Designator N6700B Part number N6701A Part number N6702A Part number Description A1 N6700-61001 N6700-61001 N6700-61001 A1 Front Panel PCA (tested) A2 0950-4655 0950-4687 0950-4687 (qty.
Replaceable Parts 6 Parts Location Diagrams 3 4 5 6 7 8 blue stripe faces right 2 9 1 10 20 11 A1 A2 A3 A4 12 blue stripe faces left 13 14 15 A5 blue stripes face back 16 red stripe faces back 17 19 18 Figure 4-1.
6 Replaceable Parts 3 8 7 6 5 4 blue stripe faces right 2 21 22 9 1 10 11 A1 A2 A3 A4 12 blue stripe faces left 13 14 A5 15 blue stripes face back 16 red stripe faces back 17 19 18 Figure 4-2.
Appendix A Error Messages Displaying Error Messages ............................................................................ 102 Error List............................................................................................................ 102 This appendix gives the error numbers and descriptions that are returned by the Agilent N6700 Modular Power System. Error messages can be displayed on the front panel and also read back programmatically.
Appendix A Error Messages Displaying Error Messages The instrument beeps each time a command syntax or hardware error is generated. The front-panel ERR annunciator turns on when one or more errors are currently stored in the SCPI error queue. Front Panel: Press the Error key. SCPI Command: SYST:ERR? If errors appear, use the navigation keys to scroll though the list. Errors are cleared as they are read. When all errors have been read, the ERR annunciator turns off and the error queue is cleared.
Error Messages Appendix A Device-dependent Errors (continued) 200 Hardware error channel A hardware error has occurred on the specified channel. 201 Invalid configuration, empty slots There is an empty slot between modules. This configuration is not allowed. 202 Selftest Fail A selftest failure has occurred. See selftest failure list for details. 203 Compatibility function not implemented The requested compatibility function is not available.
Appendix A Error Messages Command Errors (continued) 104 −108 Parameter not allowed More parameters were received than were expected. −109 Missing parameter Fewer parameters were received than were expected. −110 Command header error An error was detected in the header. −111 Header separator error A character that was not a valid header separator was found in the command string. −112 Program mnemonic too long The header contains more than 12 characters.
Error Messages Appendix A Command Errors (continued) −160 Block data error Generic block data error −161 Invalid block data The number of data bytes sent does not match the number of bytes specified in the header. −168 Block data not allowed Data was sent in arbitrary block format but is not allowed for this command. −170 Expression error Generic expression error −171 Invalid expression data The expression data element was invalid.
Appendix A Error Messages Query Errors (these errors set Standard Event Status register bit #2) −400 Query Error Generic error query −410 Query INTERRUPTED A condition causing an interrupted query error occurred. −420 Query UNTERMINATED A condition causing an unterminated query error occurred. −430 Query DEADLOCKED A condition causing a deadlocked query error occurred.
Appendix B Backdating Firmware Differences...................................................................................... 108 This appendix discusses differences in firmware revisions prior to revision D.01.07, D.00.00, and C.00.00.
Appendix B Backdating Firmware Differences Firmware Revisions Prior to D.01.07 The following features and capabilities are not available on mainframes with firmware revisions prior to D.01.07. Support for the N675xA/N676xA 300 W and 500 W power modules and the N6783A power modules. Firmware Revisions Prior to D.00.00 The following features and capabilities are not available on mainframes with firmware revisions prior to D.00.00. Support for models N678xA SMU. Firmware Revisions Prior to C.00.
Backdating Appendix B Front Panel Menu Commands for Firmware Revisions prior to D.00.00 Menu Command Control Description Output Voltage Programs voltage setting and range. Current Programs current setting and range. Delay Programs Turn-on /Turn off delay. Slew Programs voltage slew rate. Power Programs the power allocation function. Pol Lets you reverse the polarity of the output and sense terminals. Couple Couples output channels for output on/off synchronization.
Appendix B Backdating Menu Command System IO Control Description DigPort Pin1 Function Polarity Specifies the pin function: DigIn, DigIO, TrigIn, TrigOut, FaultOut. Specifies the pin polarity: Positive, Negative Pin2 Function Polarity Specifies the pin function: DigIn, DigIO, TrigIn, TrigOut. Specifies the pin polarity: Positive, Negative Pin3 Function Polarity Specifies the pin function: DigIn, DigIO, TrigIn, TrigOut, InhibitIn.
Backdating Appendix B Front Panel Menu Commands for Firmware Revisions prior to C.00.00 Menu Command Control Description Output Voltage Programs voltage setting and range. Current Programs current setting and range. Delay Program Turn-on /Turn Off delay. Range Selects voltage and current measurement range. Sweep Specifies measurement points, time interval, and trigger offset. Window Selects measurement window (Rectangular/Hanning). Control Lets you abort a measurement in progress.
Appendix B Backdating Menu Command System DigPort Control Description Pin 1 Pin 2 Pin 3 Preferences Function Specifies the pin function: DigIO, TrigIn, TrigOut, DigIn, or FaultOut.. Polarity Specifies the pin polarity. Function Specifies the pin function: DigIO, TrigIn, TrigOut, or DigIn. Polarity Specifies the pin polarity. Function Specifies the pin function: DigIO, TrigIn, TrigOut, DigIn, or InhibitIn. Polarity Specifies the pin polarity.
Index A assemblies replaceable ..................................................................... 98 B backplane board ................................................................ 95 bias board ..................................................................... 85, 94 bulk supply .......................................................................... 86 C calibration ........................................................................... 44 current downprogrammer ............................
Index preliminary checklist ......................................................... 90 print date ............................................................................... 2 R removing modules ............................................................. 83 repackaging .......................................................................... 6 replaceable parts list .................................................................................... 98 location .....................................
