Optional Tests; Dc Voltage Load Regulation Test - Fluke 5700A Series Service Manual

5700A/5720A Series II Calibrator
Service Manual
21. Push the CLEAR REF WBND soft key on the 5790A. The 5790A wideband output
22. Push the SET REF soft key on the 5790A when the 5790A settles to a reading. This
23. Repeat steps 7 and 8 above for each frequency through 30 MHz. Only the 10 MHz,
24. Make sure the rear panel CALIBRATION switch is in the ENABLE position. Store

3-31. Optional Tests

These tests may be used in acceptance testing or following repair likely to affect the
characteristics tested here. They are not recommended to be done routinely. If the
Calibrator passes Calibration Performance Verification, you do not need to perform these
tests; verification either exercises these functions or is subject to their effects. The
Optional Tests include such checks as load regulation, noise, and distortion. Equipment
required for the optional tests is listed in Table 3-13.
DMM
RMS Differential Voltmeter
Power Decade Resistor
Differential Amplifier Plug-In
Oscilloscope Mainframe
DC Voltage Reference Standard
Reference Divider
Null Detector
Kelvin-Varley Divider

3-32. DC Voltage Load Regulation Test

Use Table 3-34 for a test record. Proceed as follows to test the dc voltage load regulation:
1. Ensure the Calibrator is in standby. With the test setup of Figure 3-5, connect the
2. Set the reference divider to 10V. Set the Calibrator output to 10V dc. Set the power
3-42
changes to 10 mV at 1 kHz.
is the 10 mV reference value from which all other frequencies will be compared.
20 MHz and 30 MHz points are adjusted.
the cal constants by pushing the STORE VALUES softkey. When the display returns
to normal, set the rear panel CALIBRATION switch to NORMAL. The Calibrator
wideband flatness calibration is now complete.
Table 3-13. Equipment Required For DC V Optional Tests
Equipment
power decade resistor across the Calibrator OUTPUT terminals. Connect two
shorting links between the Calibrator SENSE and OUTPUT terminals and select
external sense (EX SNS indicator lit).
decade resistor to 199Ω. Set the Calibrator to operate. Adjust the Calibrator as
necessary to obtain a null on the null detector. Rotate the most significant dial on the
power decade resistor to 9. Verify that the null detector indication changes less than
±2 µV. Set the Calibrator to standby.
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