CLOSED-CASE CALIBRATION
Each time the signal generator receives a reading from the controller, it adjusts its
internal settings and programs the new FM deviation. When the signal generator
receives two consecutive readings within 0.1 kHz of the target value (100 kHz) it
considers the displayed adjustment value correct and returns the end code.
The controller program must ensure that each mod meter reading is settled before
sending it to the 6080A/AN. The program listing in Appendix G uses a simple but
effective method to obtain valid mod meter readings.
The programming commands used in a remote FM calibration procedure are listed in
the Table 3-4. See Table 5B-3 in Section 5B of the Operator Manual for a complete
syntax description of each command.
Table 3-4. Remote Programming Commands for FM Calibration Procedure
COMMANDS
CAL_FM
CC_RDAM
CC_FREQ?
CC_TARGET?
RFOUT
CC_SAVE
CC_EXIT
ERROR?
STATUS/STATUS?
DESCRIPTION
Initiate the remote FM calibration procedure
Send the mod meter reading to the 6080A/AN
Request the RF frequency
Request the target value
Program the RF output on/off
Save the measured data
Abort the cal procedure immediately
Request the rejected entry status
Load/Request the overrange/uncal status
RF LEVEL CALIBRATION 3-11.
The RF level calibration procedures allow a single-point calibration of the RF output
level to be performed. An RF power meter is connected to the signal generator's RF
output and the level calibration factor is adjusted based on the meter reading. The
procedure specific parameters are as follows:
Adjustment Range: ± 1.00 dB
Adjustment Resolution: 0.01 dB
Target Value: 10.0 dBm
Frequency: 300.000000 MHz
RF Level: +10.0 dBm
External Equipment: RF Power Meter (HP 436A or equivalent)
When performing the front panel procedure, use the edit knob to adjust the level until
the measured level matches the target level. When the remote procedure is performed,
the process is under the control of a program running on an IEEE-488 bus controller.
3-10
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