5790B
Service Manual
3-36
Table 3-10. Required Equipment for Calibration Adjustment of the AF Option.
Required Equipment Manufacture and Model Minimum use Requirements
Power meter with REF OUT N/A
0.1 % short term stability. SWR
better than 1.05
Power Meter Tegam 1830A Published specifications
Coaxial RF Power Standard
Tegam M1130A or Keysight
478A (Option H76)
Calibration uncertainty of 0.3 %
or better.
PC with USB or serial port running Microsoft hyperterminal program
(hyperterm.exe) or similar
RS-232 serial communication
1. Connect the Power Reference System (Power Meter with Coaxial RF Power
Standard) to the 1 mW @ MHz source. Make a measurement to establish the
output of the source. This value shall be used in consecutive measurement
with the product.
2. Connect the matching N-type cable supplied as part of the AF option to the
Wideband input.
3. Connect to the source used in step 1.
4. Execute the remote command string: INPUT WBND; DFILT FAST, MEDIUM;
5. Execute the remote command string: *CLS; CAL_WBCABLE zzzzzz V; *OPC
6. Where zzzzzz represents the voltage equivalent of the characterized source.
A characterized value in mW the conversion to voltage is as follows:
mW_value * 50 * 10
-3
√
7. This completes the Product AF Option calibration. When finished the
calibration screen is shown. The correction is automatically stored.
8. The date of the AF 50 MHz cable calibration can be obtained by executing
the remote query: CAL_DATE? STORED,WBCABLE
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