Filter
Top Products
5700A/5720A Series II Calibrator
Service Manual
3-42
21. Push the CLEAR REF WBND soft key on the 5790A. The 5790A wideband output
changes to 10 mV at 1 kHz.
22. Push the SET REF soft key on the 5790A when the 5790A settles to a reading. This
is the 10 mV reference value from which all other frequencies will be compared.
23. Repeat steps 7 and 8 above for each frequency through 30 MHz. Only the 10 MHz,
20 MHz and 30 MHz points are adjusted.
24. Make sure the rear panel CALIBRATION switch is in the ENABLE position. Store
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.
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.
Table 3-13. Equipment Required For DC V Optional Tests
Equipment Model
DMM Wavetek 1281 or HP 3458A
RMS Differential Voltmeter Fluke 5790A
Power Decade Resistor Clarostat 240C
Differential Amplifier Plug-In Tektronix 7A22
Oscilloscope Mainframe Tektronix 7000 Series
DC Voltage Reference Standard Fluke 732B
Reference Divider Fluke 752A
Null Detector EM Electronics N11(Fluke 845A)
Kelvin-Varley Divider Fluke 720A
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
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).
2. Set the reference divider to 10V. Set the Calibrator output to 10V dc. Set the power
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.