Agilent N2820/1A High-Sensitivity Current Probes User’s Guide Agilent Technologies
Notices Restricted Rights Legend © Agilent Technologies, Inc. 2013 If software is for use in the performance of a U.S. Government prime contract or subcontract, Software is delivered and licensed as "Commercial computer software" as defined in DFAR 252.227-7014 (June 1995), or as a "commercial item" as defined in FAR 2.101(a) or as "Restricted computer software" as defined in FAR 52.227-19 (June 1987) or any equivalent agency regulation or contract clause.
Contents Contents 1 General Information Introduction 6 Accessories 10 Measurements on Battery Powered Devices 12 Connecting the Probe to The Oscilloscope 13 N2820A Probes and Dual-Grid View 18 Charge—A New Measurement 20 Dynamic Range 24 Inspecting the Probe 26 Returning the Probe for Service 27 Safety Information 28 2 Probing Introduction 32 Attaching a Probe Head 34 N2822/4A Probe Heads 35 N2825A User-Defined Head 37 Make-Before-Break Connectors 40 To Attach the Sensor Leads 44 To Change an N2825A Hea
Contents N2820A Input Impedance Input Load Model 69 5 68 Performance Verification Average Gain of Zoomed-In Channel 73 Average Gain of Zoomed-Out Channel 77 Performance Test Record 80 4 N2820/1A User’s Guide
1 General Information Introduction 6 Accessories 10 Measurements on Battery Powered Devices 12 Connecting the Probe to The Oscilloscope 13 N2820A Probes and Dual-Grid View 18 Charge—A New Measurement 20 Dynamic Range 24 Inspecting the Probe 26 Returning the Probe for Service 27 Safety Information 28 The N2820A and N2821A high- sensitivity current probes allow you to measure AC and DC currents from 50 μA to 5A.
1 General Information Introduction Introduction The N2820A and N2821A probes are shipped in the case that is shown in Figure 1. When you receive the probe, inspect it as described in “Inspecting the Probe” on page 26. When opening the case, lift out the foam cutout and flip the cutout over to reveal the ground lead and secondary cable as shown in the following figure. The secondary cable is only provided with N2820A probes.
General Information Introduction 1 includes two amplifiers and its main output can be switched between these two views. Before using an N2820A probe, connect the secondary cable as described in “Connecting the Probe to The Oscilloscope” on page 13. The N2821A single- channel probe looks identical to the N2820A but does not include the secondary cable. The accessories provided with the probes are shown in Figure 3 on page 10.
1 General Information Introduction Oscilloscope Compatibility NOTE The N2820A and N2821A probes are compatible with the Agilent oscilloscopes shown in Table 1. The table also lists the minimum required firmware version for the oscilloscope. The N2820A and N2821A probes are designed for oscilloscopes with 1 MW AutoProbe-interface channel inputs.
General Information Introduction 1 Infiniium Dual-Grid View The N2820A probe provides two channel- input cables which allow two simultaneous views of the current waveform: a high- gain zoomed- in and a low- gain zoomed- out view. On Infiniium oscilloscopes, both zoomed- in and zoomed- out waveforms can be simultaneously displayed in dual- grid view, where each waveform can be viewed in a different time span. To learn more about dual- grid view, refer to “N2820A Probes and Dual- Grid View” on page 18.
1 General Information Accessories Accessories Supplied Accessories The N2820A and N2821A probes come with the accessories shown in Figure 3. To learn how to use these accessories, refer to Chapter 2, “Probing”.
General Information Accessories NOTE Replacement Accessories To ensure the display of accurate waveforms, always connect the supplied ground lead when probing battery-powered devices, such as mobile phones. Refer to “Measurements on Battery Powered Devices” on page 12. Table 2 shows the available replacement accessories and parts.
1 General Information Measurements on Battery Powered Devices Measurements on Battery Powered Devices When making measurements on a battery- powered (floating) device, such as a mobile phone, always connect the supplied ground lead between ground on your device and the probe’s ground connector as shown in Figure 4. Simply snap the end of the ground lead onto the probe’s connector. Without the ground connection, the common mode voltage is not guaranteed to be within the common mode range of the amplifiers.
General Information Connecting the Probe to The Oscilloscope 1 Connecting the Probe to The Oscilloscope If you have an N2820A two- channel probe, locate the secondary cable and gently snap the cable into the probe amplifier as shown in Figure 5. The N2821A probes are not designed for use with the secondary cable and cannot be upgraded. Figure 5 To Clean the Probe Disconnect the probe from the oscilloscope and clean the probe with a soft cloth dampened with a mild soap and water solution.
1 General Information Connecting the Probe to The Oscilloscope Figure 6 14 Two N2820A Probes Connected to the Oscilloscope N2820/1A User’s Guide
General Information Connecting the Probe to The Oscilloscope Probe Configuration (Infiniium Oscilloscopes) 1 Use the Probe Configuration dialog box to setup your probe. For N2820A probes, the probe’s primary channel tab in the Probe Configuration dialog box configures both the primary and secondary channel. The secondary channel is listed on another tab but is not controlled from that tab.
1 General Information Connecting the Probe to The Oscilloscope 4 If you are using an N2821A probe, use the Primary Channel Output field to configure the input channel as a zoomed- in or zoomed- out channel. 5 If you are using an N2825A user- defined head, in the dialog box click Add Head to assign a unique name to the head and enter the resistance of the external RSENSE resistor in the User Def Head Resistance field. For more information, refer to “N2825A User- Defined Head” on page 37.
General Information Connecting the Probe to The Oscilloscope 1 To configure the probe N2820/1A User’s Guide 1 Connect the probe to the oscilloscope. On N2820A probes, connect the primary channel first followed by the secondary channel. 2 Press the front- panel channel key that is associated with the probe’s primary input. 3 Press the Probe softkey.
1 General Information N2820A Probes and Dual-Grid View N2820A Probes and Dual-Grid View When using an N2820A probe on a 9000 H- Series or 9000A Infiniium oscilloscope, the zoomed- in and zoomed- out waveforms can be simultaneously viewed in dual- grid view, as shown in Figure 9. In dual- grid view, the zoomed- out waveform originates from the probe's low- gain amplifier, and the zoomed- in waveform originates from the probe's high- gain amplifier.
General Information N2820A Probes and Dual-Grid View 1 If you’re familiar with the oscilloscope’s Zoom Mode, you may be interested to know that while Zoom Mode uses software to expand the zoomed- in waveform, dual- grid view uses hardware amplification applied by the probe’s high- gain amplifier. On the display, the white bounding- area box identifies the portion of the zoomed- out waveform that is displayed in the zoomed- in window. This box does not indicate waveform clipping.
1 General Information Charge—A New Measurement Charge—A New Measurement For the N2820A and N2821A probes, the oscilloscopes include a new measurement, Charge. This measurement determines the total current consumption over time with the results listed in ampere- hours (Ah). For N2820A probes, the measurement includes the area under the curve across both zoomed- in and zoomed- out waveforms.
General Information Charge—A New Measurement Zoom Mode Buttons 9000 H-Series and 9000A Oscilloscopes 3000 X and 4000 X-Series Oscilloscopes With the oscilloscope’s Zoom Mode turned on, gating can be used to show a reduced zoom- window time span compared to the normal window. This is indicated on the non- zoomed waveform by a white boundary- area box (Infiniium scopes) or a non- shaded boundary- area box (InfiniiVision scopes). Click the oscilloscope’s Zoom button to turn on Zoom Mode.
1 General Information Charge—A New Measurement On Infiniium Oscilloscopes To make a Charge measurement: 1 Connect the probe. If an N2825A user- defined head is used, enter the RSENSE resistance as explained in “Probe Configuration (Infiniium Oscilloscopes)” on page 15. 2 Click Measure > Mixed > Charge (N282XA). 3 In the Enter Measurement Info dialog box: a If Zoom Mode is turned on, select Gate to Zoom Window to enable a reduced zoom- window time span.
General Information Charge—A New Measurement On InfiniiVision Oscilloscopes 1 To make a Charge measurement: 1 Connect the probe. If an N2825A user- defined head is used, enter the RSENSE resistance as explained in “Probe Configuration (InfiniiVision Oscilloscopes)” on page 16. 2 Press the front- panel Meas key. 3 Press the Type: softkey. 4 Select one of two measurements: Charge - Full Screen. The Full Screen measurement interval variation measures the value on all displayed data points.
1 General Information Dynamic Range Dynamic Range The N2820A and N2821A probes provide a large dynamic measurement range (>20,000:1 or 86 dB on the zoomed- in channel) that allows you to observe both the entire current waveform and extremely small current fluctuations. As shown in Figure 13, you could simultaneously view a mobile phone’s 135 mA receive current pulses and 2 mA idle current in the presence of 2A transmit current pulses, with a single acquisition.
General Information Dynamic Range 1 about 50 µA and the zoomed- out channel can display about 2.2A for a dynamic range of approximately 93 dB: 2.2A 93dB = 20 log -------------50 μA The value of the RSENSE resistor can range from 1 mW to 1 MW as shown in Figure 29, “Maximum Current Range,” on page 54. Using these two RSENSE values in different measurements, the dynamic range could be increased to 100 dB.
1 General Information Inspecting the Probe Inspecting the Probe ■ Inspect the shipping container for damage. Keep the damaged shipping container or cushioning material until the contents of the shipment have been checked for completeness and the probe has been checked mechanically and electrically. ■ Check the accessories. ■ If the contents are incomplete or damaged, notify your Agilent Technologies Sales Office. ■ Inspect the probe.
General Information Returning the Probe for Service 1 Returning the Probe for Service If the probe is found to be defective we recommend sending it to an authorized service center for all repair and calibration needs. Perform the following steps before shipping the probe back to Agilent Technologies for service. 1 Contact your nearest Agilent sales office for information on obtaining an RMA number and return address.
1 General Information Safety Information Safety Information This manual provides information and warnings essential for operating this probe in a safe manner and for maintaining it in safe operating condition. Before using this equipment and to ensure safe operation and to obtain maximum performance from the probe, carefully read and observe the following warnings, cautions, and notes.
General Information Safety Information 1 WARNING Observe Probe Ratings. Do not apply any electrical potential to the probe input which exceeds the maximum rating of the probe. Make sure to comply with the voltage versus frequency derating curve found in this manual. WARNING Keep Away From Live Circuits. Avoid open circuitry. Do not touch connections or components when power is present. WARNING Indoor Use Only. Do not operate in wet/damp environments. Keep product surfaces dry and clean.
1 General Information Safety Information CAUTION NOTE The probe cable is a sensitive part of the probe and, therefore, you should be careful not to damage it through excessive bending or pulling. Avoid any mechanical shocks to this product in order to guarantee accurate performance and protection. Avoid, if possible, the proximity of other conductors which may create noise.
2 Probing Introduction 32 Attaching a Probe Head 34 N2822/4A Probe Heads 35 N2825A User-Defined Head 37 Make-Before-Break Connectors 40 To Attach the Sensor Leads 44 To Change an N2825A Head’s ID Resistor 45 To Add an RSENSE Resistor to an N2825A Head 49 In this chapter, you’ll learn how to configure and connect the probe to your Device Under Test (DUT). The probe accessories are very flexible and can be configured to match your unique probing requirements regarding convenience versus accuracy.
2 Probing Introduction Introduction As mentioned in chapter 1, there are three interchangeable RSENSE probe heads: N2822A, N2824A, and N2825A. The N2822A and N2824A heads include different internal RSENSE resistor values. The N2825A user- defined head does not include an RSENSE resistor and is selected in situations when you want to use your own external RSENSE resistor that is mounted on your DUT. For instructions on how to attach a probe head to the probe, refer to “Attaching a Probe Head” on page 34.
Probing Introduction Figure 14 N2820/1A User’s Guide 2 Different Probing Connections With Relative Merit 33
2 Probing Attaching a Probe Head Attaching a Probe Head You do not need any tools to attach or remove a probe head. To attach a head to the probe, gently press the head into position on the probe amplifier while carefully mating the connector as shown in Figure 15. Never apply excessive force when attaching the head. To remove a head, pull the head straight off the probe in the direction shown. NOTE Do not remove the four head screws when removing the head.
Probing N2822/4A Probe Heads 2 N2822/4A Probe Heads The N2822/4A heads include an RSENSE resistor. Because the oscilloscope recognizes when these probes are connected, the oscilloscope automatically knows the value of the RSENSE resistor when calculating measurements. Table 3 Description of Heads Description N2822A N2824A RSENSE Resistor 20 mΩ 100 mΩ ±1% ±1% RSENSE Tolerance a Maximum Power Dissipation Current Range Added Benefit 500 mW 500 mW 250 µA to 5A 50 µA to 2.
2 Probing N2822/4A Probe Heads Figure 16 Table 4 Vburden Developed Across Probing Components Resistance Added by Head Components Component 36 Resistance Contribution (Round Trip) Sensor Leads Without Socket 20 mΩ Sensor Leads With Socket 40 mΩ MBB Header Only (Not Connected) 20 mΩ MBB Header/Receptacle/Socket 40 mΩ RSENSE (N2822A Head) 20 mΩ RSENSE (N2824A Head) 100 mΩ Need a Different RSENSE Resistor Value? If you need to use a different RSENSE resistance than provided by the N2822A a
Probing N2825A User-Defined Head 2 N2825A User-Defined Head Use the N2825A user- defined head in situations where you want to use your own RSENSE resistor that you have mounted on your DUT. As shown in Figure 14 on page 33, the N2825A head has the lowest burden voltage. But, in some situations, the N2825A head may be less convenient to use than the N2822A and N2824A heads.
2 Probing N2825A User-Defined Head In the dialog box, use the User Def Head Resistance field to enter the RSENSE resistance. Because the oscilloscope associates this resistance with the N2825A head, you only need to enter the value of your RSENSE resistor the first time that you use the N2825A head. On InfiniiVision oscilloscopes, associate an N2825A head with a specific RSENSE resistance by pressing the front- panel channel key that is associated with the probe’s primary input.
Probing N2825A User-Defined Head Converting an N2825A to Internal RSENSE Head N2820/1A User’s Guide 2 Although the N2825A is intended to be used with an external RSENSE resistor mounted on your DUT, you can add an RSENSE resistor internal to the N2825A head. This converts the N2825A head so that it is similar to the N2822/4A heads. The value of the precision resistor can range from 1 mW to 1 MW in 1 mW increments.
2 Probing Make-Before-Break Connectors Make-Before-Break Connectors The supplied Make- Before- Break (MBB) connectors allow you to quickly probe multiple locations on your DUT without having to solder or unsolder the leads. You can easily connect and disconnect them without interrupting the circuit- under- test as shown in Figure 18. The MBB can be used with all RSENSE probe heads including the N2825A user- defined probe head.
Probing Make-Before-Break Connectors Figure 19 2 Socketed Lead Snaps Onto the MBB Receptacle To Use the MBB Connector 1 Solder one or more headers onto your DUT. 2 Snap the sensor lead’s socket onto the receptacle. NOTE 3 Once attached to the receptacle, the socket cannot easily be removed without deforming the receptacle. For information on ordering additional socketed sensor leads, receptacles, and headers, refer to Table 2 on page 11.
2 Probing Make-Before-Break Connectors Figure 20 42 Connecting the MBB Connector with N2822/4A Head N2820/1A User’s Guide
Probing Make-Before-Break Connectors Figure 21 To Download the Header Gerber File 2 MBB Connector With N2825A User-Defined Head You can download a Gerber file from Agilent that defines many of the parameters needed to design the PC board connection for the MBB header. Gerber files can be imported into many PC board layout applications. You can download this file using the following URL: www.agilent.
2 Probing To Attach the Sensor Leads To Attach the Sensor Leads 1 Detach the head from the probe amplifier as explained in “Attaching a Probe Head” on page 34. 2 Position the sensor leads into the head’s access hole as shown in Figure 22. Figure 22 3 Flip the head as shown in Figure 23 and insert the leads up through the PC board’s solder holes TP1 and TP2. Insert the RED (+) lead at TP2 and the BLACK lead at TP1. Solder the leads in place.
Probing To Change an N2825A Head’s ID Resistor 2 To Change an N2825A Head’s ID Resistor 1 Detach the head from the probe amplifier as explained in “Attaching a Probe Head” on page 34. 2 Remove the four hex screws that secure the cover of the N2825A RSENSE head and remove the cover. Figure 24 3 Remove the PC board from the head. Figure 25 4 N2820/1A User’s Guide Removing the N2825A Cover Remove PC Board On the reverse side of the PC board, locate ID resistor, R2, as shown in Figure 26.
2 Probing To Change an N2825A Head’s ID Resistor Figure 26 5 Replace the ID resistor with one of the values listed in Table 5. The default value loaded on the board is 16.2 kW. You can purchase a resistor from a supplier such as Digi- Key corporation. CAUTION If you are not skilled in soldering, ask a trained assembler to change the resistor. Table 5 6 46 Location of ID Resistor (R2) Valid N2825A ID Resistors Resistor Value Description 16.2 kΩ Default value. Resistor, ±1%, 0.
Probing To Change an N2825A Head’s ID Resistor 8 2 On Infiniium oscilloscopes, a Click the Setup > Probe Configuration menu command. b Select the tab for the probe’s primary channel. N2821A probes only have a primary channel. c In the User Def Head Resistance field, enter the resistance of the DUT’s RSENSE resistor in ohms. d In the dialog box, click Add Head to give your head with associated external RSENSE resistor a unique name.
2 Probing To Change an N2825A Head’s ID Resistor Table 6 N2825A Identification N2825A Marking 48 Associated DUT RSENSE Resistor Value ID Resistor Value Probe Name Registered on the Oscilloscope N2820/1A User’s Guide
Probing To Add an RSENSE Resistor to an N2825A Head 2 To Add an RSENSE Resistor to an N2825A Head You can add your own RSENSE resistor to N2825A heads. Use a resistor of type ±1%, 0.5W, TC ±600, thick film 2010 SMT. The value of the precision resistor can range from 1 mW to 1 MW in 1 mW increments. When selecting the resistance value, you must observe the 500 mW maximum power rating of the head. 1 Detach the head from the probe amplifier as explained in “Attaching a Probe Head” on page 34.
2 Probing To Add an RSENSE Resistor to an N2825A Head Figure 28 Location of RSENSE Resistor (R1) 4 Replace the head’s cover using the four screws. (M1.6 x 0.35, 5 mm long, Agilent part number 0515- 5210) CAUTION To avoid damaging the aluminum casting, do not over tighten the screws. 5 Connect the N2825A to an N2820/1A probe and connect the probe to the oscilloscope. 6 On Infiniium oscilloscopes, a Click the Setup > Probe Configuration menu command.
3 Characteristics and Specifications Current Range Graphs 54 Zoomed-In Input Voltage Range Versus Supply Voltage 56 Zoomed-In Input Current Range Versus Supply Voltage 57 Dimensions 59 This chapter provides the characteristics and specifications for the N2820A and N2821A probes. The probe should be warmed up for at least 20 minutes before any testing and the environmental conditions should not exceed the probe’s specified limits.
3 Characteristics and Specifications Table 7 Characteristics and Specifications Item Bandwidth (–3 dB) Risetime (Tr = 0.
Characteristics and Specifications Table 8 Environmental Characteristics Item Temperature (operating) Humidity (operating) ESD Indoor Use Table 9 3 Characteristic Operating: 0° C to 40° C Non-Operating: –40° C to 70° C Operating: tested at 95% RH @ +40° C Non-Operating: tested at 90% RH, +65° C 8 kV HBM This probe is rated for indoor use only Compatible Oscilloscopes InfiniiVision Oscilloscopes 3000 X-Series (with software version 2.30 or higher) 4000 X-Series (with software version 3.
3 Characteristics and Specifications Current Range Graphs Current Range Graphs The following graphs show the minimum and maximum current ranges versus RSENSE resistance. NOTE These graphs represent a condition where the sensor leads are solder attached to the RSENSE resistor, the maximum probe-head power rating of 500 mW is observed, and the oscilloscope is set to high-resolution.
Characteristics and Specifications Current Range Graphs Figure 30 N2820/1A User’s Guide 3 Minimum Current Range 55
3 Characteristics and Specifications Zoomed-In Input Voltage Range Versus Supply Voltage Zoomed-In Input Voltage Range Versus Supply Voltage For the zoomed- in probe input, the following graph shows the typical input voltage range allowed based on the supply voltage that you are measuring. For example, when measuring a 5V input, the input voltage range is \45 mV.
Characteristics and Specifications Zoomed-In Input Current Range Versus Supply Voltage 3 Zoomed-In Input Current Range Versus Supply Voltage For the zoomed- in probe input, the following two graphs show the typical input current range allowed based on the supply voltage that you are measuring. For example, when using an N2824A head and measuring a 5V input, the current range is \0.54A. When using an N2822A head and measuring a 5V input, the current range is \1.0A.
3 Characteristics and Specifications Zoomed-In Input Current Range Versus Supply Voltage Figure 33 58 Zoomed-In Input Current Range Versus Supply Voltage (N2822A 20 mW Head) N2820/1A User’s Guide
Characteristics and Specifications Dimensions 3 Dimensions Figure 34 N2820/1A User’s Guide Probe and Tip Dimensions 59
3 60 Characteristics and Specifications Dimensions N2820/1A User’s Guide
4 Performance Data Plots N2820A Frequency Response 62 N2820A Common Mode Rejection Ratio N2820A Step Response 65 N2820A Step Tracking 66 N2820A Input Impedance 68 Input Load Model 69 64 This chapter provides the performance plots for the N2820A.
4 Performance Data Plots N2820A Frequency Response N2820A Frequency Response BW: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Data Plots N2820A Frequency Response 4 BW: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.
4 Performance Data Plots N2820A Common Mode Rejection Ratio N2820A Common Mode Rejection Ratio Figure 37 64 Common Mode Rejection Ratio (CMRR) N2820/1A User’s Guide
Performance Data Plots N2820A Step Response 4 N2820A Step Response Zoomed- In Channel 10–90% rising edge step: . . . . . . . . . . . . . . . 584.2 ns 20–80% rising edge step: . . . . . . . . . . . . . . . 365.8 ns Zoomed- Out Channel 10–90% rising edge step: . . . . . . . . . . . . . . . 96.76 ns 20–80% rising edge step: . . . . . . . . . . . . . . . 63.
4 Performance Data Plots N2820A Step Tracking N2820A Step Tracking Input Step 10–90% Rise Time: . . . . . . . . . . . . . . . . . . . 1.688 µs 20–80% Rise Time: . . . . . . . . . . . . . . . . . . . 1.153 µs Output Step 10–90% Rise Time: . . . . . . . . . . . . . . . . . . . 1.769 µs 20–80% Rise Time: . . . . . . . . . . . . . . . . . . . 1.
Performance Data Plots N2820A Step Tracking 4 Input Step 10–90% Rise Time: . . . . . . . . . . . . . . . . . . . 446.9 ns 20–80% Rise Time: . . . . . . . . . . . . . . . . . . . 299.8 ns Output Step 10–90% Rise Time: . . . . . . . . . . . . . . . . . . . 450.0 ns 20–80% Rise Time: . . . . . . . . . . . . . . . . . . . 302.
4 Performance Data Plots N2820A Input Impedance N2820A Input Impedance Figure 41 68 Input Impedance N2820/1A User’s Guide
Performance Data Plots Input Load Model 4 Input Load Model Figure 42 N2820/1A User’s Guide Input Load Model 69
4 70 Performance Data Plots Input Load Model N2820/1A User’s Guide
5 Performance Verification Average Gain of Zoomed-In Channel 73 Average Gain of Zoomed-Out Channel 77 Performance Test Record 80 This chapter describes how to verify the performance of the N2820A and N2821A probes. The performance verification requires an N2825A probe head and consists of verifying the probe’s DC gain. NOTE The performance measured in this procedure is for the probe by itself.
5 Performance Verification Table 10 Required Test Equipment Test Equipment Recommended Model Digital Multimeter General purpose instrument for DC voltage measurement. DC Power Supply Recommended: ±20V Maximum: ≤ ±35V Probe Power Supply Agilent 1143A Probe Offset Control and Power Module Probe Adapter Agilent N1022A/B Probe Adapter. Adapters 3.
Performance Verification Average Gain of Zoomed-In Channel 5 Average Gain of Zoomed-In Channel This procedure applies to both N2820A and N2821A probes. NOTE 1 Allow the probe to warm up for at least 20 minutes. Snap an N2825A head onto the N2820/1A probe and connect the test equipment as shown in Figure 43. Be sure to connect the positive side of the DC supply to the red lead on the N2825A head. Figure 43 2 NOTE N2820/1A User’s Guide Test Setup for Measuring Vin Set the DC power supply to +20 mV.
5 Performance Verification Average Gain of Zoomed-In Channel 3 Record the value of +Vin measured on the multimeter: +Vin: 4 Move the multimeter’s leads to the banana plug on the output of the N1022A/B as shown in Figure 44.
Performance Verification Average Gain of Zoomed-In Channel 5 +V out positive gain = -----------+V in positive gain: 7 NOTE Set the DC power supply to –20 mV. Although this is the recommended setting, you can use any negative voltage less than –35 mV. 8 Connect the multimeter on the DC power supply as shown in Figure 43 on page 73.
5 Performance Verification Average Gain of Zoomed-In Channel positive gain + negative gain average gain = -----------------------------------------------------------2 average gain (zoomed- in): 14 76 The average gain (zoomed- in) should be 300 ±3%. Enter the value in Table 11 on page 80.
Performance Verification Average Gain of Zoomed-Out Channel 5 Average Gain of Zoomed-Out Channel Perform this procedure only for N2820A probes. NOTE 1 Allow the probe to warm up for at least 20 minutes. Snap an N2825A head onto the N2820/1A probe and connect the test equipment as shown in Figure 45. Be sure to connect the positive side of the DC supply to the red lead on the N2825A head. Figure 45 2 NOTE N2820/1A User’s Guide Test Setup for Measuring Vin Set the DC power supply to +500 mV.
5 Performance Verification Average Gain of Zoomed-Out Channel 3 Record the value of +Vin measured on the multimeter: +Vin: 4 Move the multimeter’s leads to the banana plug on the output of the N1022A/B as shown in Figure 46.
Performance Verification Average Gain of Zoomed-Out Channel 7 NOTE 5 Set the DC power supply to –500 mV. Although this is the recommended setting, you can use any negative voltage less than –700 mV. 8 Connect the multimeter on the DC power supply as shown in Figure 45 on page 77. 9 Record the value of –Vin measured on the multimeter: –Vin: 10 Connect the multimeter’s leads to the banana plug on the output of the N1022A/B as shown in Figure 46 on page 78.
5 Performance Verification Performance Test Record Performance Test Record Table 11 N2820/1A Performance Test Record Model #: Date: Tested by: Recommended next test date: Recommended Test Interval: 1 year / 2000 hours Probe Amplifier Test Limits Result Pass/Fail Average Gain of Zoomed-In Channel (N2820/1A) Average Gain (zoomed-in ) 300 ±3% Average Gain of Zoomed-Out Channel (N2820A only) Average Gain (zoomed-out) 80 1.
Index Index Numerics 1143A Probe Offset Control and Power Module, 72 dual-grid view, 9, 18 dynamic range and R-Sense resistor, 24 A E accessories replacement, 11 supplied, 10 Add Head field, 16 Agilent Technologies, contacting, 27 Ah, 20 attaching probe head, 34 ESD, 7 B battery-powered devices, 12 burden voltage, 35 F floating devices, 12 G Gate to Zoom Window, 21, 22 Gerber file, MBB header, 43 ground lead, 10, 12 H C cable primary, 7 secondary, 7 cables, 7 channel identification rings, 9 Charge
Index primary cable, 13 Primary Channel Output field, 16 probe cleaning, 13 configuration, 15 connecting, 13 inspecting, 26 leads, 32 N2820A connection order, 13 service, 27 Probe Configuration dialog box, 15, 47 Probe Configuration menu, 15 probe head attaching, 34 ID resistor, 45 N2822/4A, 35 N2825A, 37 probe power supply, 72 Probe softkey, 17, 38, 50 probe, configuring, 15, 17 probing connections, choices, 33 T twisted leads, 10 Type softkey, 23 U upgrade, 9 User Def Head Resistance field, 16 user-def
