SERVICE MANUAL 150 AND 300 WATT ELECTRONIC LOAD MODULES Agilent 60501B AND 60502B Part No. 5951-2830 SERVICE MANUAL FOR INSTRUMENTS WITH SERIAL NUMBERS Agilent 60501B US37240101 AND ABOVE Agilent 60502B US37240101 AND ABOVE For instruments with higher Serial Numbers, a change page may be included. Microfiche Part No.
CERTIFICATION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other International Standards Organization members.
SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation, service and repair of this instrument. Failure to comply with these precautions or with specific warnings 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. BEFORE APPLYING POWER.
Table of Contents General Information............................................................................................................................................................... 5 About This Manual ................................................................................................................................................................... 5 Troubleshooting Precautions .....................................................................................................
1 General Information About This Manual This manual is designed to be used along with the Agilent 6050A/6051A Service Manual. It includes service information that is specific to the 60501B/60502B Modules. Troubleshooting information such as fault isolation, signature analysis, and block-level troubleshooting is the same for all modules and is found in the Agilent 6050A/6051A Electronic Load Mainframe Service Manual.
Module Initialization EEPROM chip U342 on the Control Board stores the module's GPIB address and model number as well as other constants. The EEPROM was programmed with the proper constants at the factory. If the Control board or the EEPROM chip (U342) is replaced, the module must be reinitialized with the proper constants by programming the following commands in the order indicated. After it has been initialized, the module must also be recalibrated as described in the Operating Manual.
2 Verification Introduction This chapter contains test procedures that check the operation and calibration of the Agilent 60501B/60502B Electronic Load Modules. The tests are performed from the front panel of an Agilent 6050A/6051A Electronic Load Mainframe with the module installed in slot 1. The tests can also be used to determine which circuits are faulty when troubleshooting.
CC Mode Test This test verifies that the module operates in the CC Mode and that the current programming and readback to the front panel display are within specifications. For each DMM reading, the front panel display should be equal to: 60501B: DMM reading in amps ± ((DMM reading in amps x 0.0006) + 0.040). 60502B: DMM reading in amps ± ((DMM reading in amps x 0.0005) + 0.065).
d. Check the low current range as follows: 1. Press 60501B: 60502B: then then . . 2. Wait 10 seconds then record the DMM and front panel display readings. DMM reading should be between: 60501B: 29.57mV (2.957A) and 30.43mV (3.043A). 60502B: 59.19mV (5.919A) and 60.81mV (6.081A). 3. . Press 4. Wait 10 seconds and record the DMM and front panel display readings. DMM reading should be between: 60501B: 9.59mV (0.959A) and 10.41mV (1.041A). 60502B: 9.24mV (0.924A) and 10.76mV (1.076A).
. e. Press f. Record the DMM and front panel display readings. DMM reading should be between 2.947V and 3.053V. CR Mode Test This test verifies that the module operates in the CR Mode and that the resistance programming is within specifications.
c. Check the middle ohms range as follows: 1. Press 60501B: 60502B: , then . . 2. Set power supply for: 60501B: 10.9V and 8A. 60502B: 10.9V and 15A. 3. Measure the voltage across the monitor resistor and across the module's input terminals, then calculate the Electronic Load resistance. The result should be between: 60501B: 46 and 86 ohms. 60502B: 24.1 and 39.6 ohms. 4. Then press: 60501B: 60502B: . . 5.
Transient Operation and Slew Circuit Test This test verifies transient and slew circuit operation. The slew circuits cannot be calibrated. If slew rise time and/or fall time are not within specifications or the slew circuits are inoperative, perform either the "Transient Generator Troubleshooting", or the "Slew Circuit Troubleshooting" in Chapter 3 of the mainframe Service Manual. a. Use the test setup of Figure 2-1 except connect an oscilloscope across the 0.
h. Adjust the oscilloscope for a single rise or fall time display. Use delayed sweep. The rise time when measured from 10% to 90% or the fall time when measured from 90% to 10% should be between: 60501B: 0.6 and 1.0ms. 60502B: 1.5 and 2.5ms. CC Mode PARD Test CC mode PARD (periodic and random deviations) is specified as the rms input current in a frequency range 20Hz to 10Mhz. This test checks CC Mode PARD. a.
The Electronic Load's front panel should indicate between: 60501B: 33 volts and between 6 and 8 amps. 60502B: 33 volts and between 13 and 17 amps. The front panel Prot annunciator should also be on. to display " − − OP", indicating that an overpower condition exists and the Electronic Load is in power e. Press limit. f. Let the Electronic Load continue running. Within three minutes the Electronic Load should turn its input off, and the display should show ''PS − − OP'' indicating protection shutdown.
PERFORMANCE TEST RECORD - Agilent 60501B LOAD MODULE (Page 1 of 2) Test Facility: ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ Report No.
PERFORMANCE TEST RECORD - Agilent 60501B LOAD MODULE (Page 2 of 2) Model Agilent 60501B Test Description Report No.____________________ Minimum Specification Date______________________________ Results Maximum Specification Measurement Uncertainty CONSTANT CURRENT MODE TESTS 30 Ampere Range Programming and Readback High Current (30A) Front Panel Display Low Current (1A) Front Panel Display 29.930 AOUT -0.058 0.959 AOUT -0.040 ____________A ____________A ____________A ____________A 30.070 AOUT +0.
PERFORMANCE TEST RECORD - Agilent 60502B LOAD MODULE (Page 1 of 2) Test Facility: ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ Report No.
PERFORMANCE TEST RECORD - Agilent 60502B LOAD MODULE (Page 2 of 2) Model Agilent 60502B Test Description Report No.____________________ Minimum Specification Date______________________________ Results Maximum Specification Measurement Uncertainty CONSTANT CURRENT MODE TESTS 60 Ampere Range Programming and Readback High Current (60A) Front Panel Display Low Current (1A) Front Panel Display 59.865 AOUT -0.095 0.924 AOUT -0.065 ____________A ____________A ____________A ____________A 60.135 AOUT +0.
3 Replaceable Parts Introduction Tables 3-3 and 3-4 list the electrical components and Table 3-5 lists the mechanical components for the Agilent 60501B/60502B Electronic Load Modules. These tables provide the following information. • Reference designation (see Table 3-1). • Agilent part number. • Description of part (see Table 3-2). Refer to Figures 4-2 and 4-4 for component locations.
Table 3-3.
Table 3-3.
Table 3-3.
Table 3-3.
Table 3-4.
Table 3-4.
Table 3-4.
Table 3-4.
Table 3-4.
Table 3-5.
4 Diagrams Schematic Diagrams Schematic diagrams and component location diagrams are provided for the Control board as well as the Power board on two foldout pages. Two schematic diagrams of the Power board are included in Figure 4-2 on the first foldout; three schematic diagrams of the Control board are included in Figure 4-4 on the second foldout. Table 4-1 lists the notes that apply to both the Control board and Power board schematic diagrams.
Table 4-2.
Table 4-2.
Table 4-2.
