CLOSED-CASE CALIBRATION
AM CALIBRATION 3-5.
The AM calibration procedures allow a single point calibration of the AM depth to be
performed. An RF modulation meter is connected to the 6080A/AN's RF output and
the AM calibration factor is adjusted based on the meter reading. The procedure
specific parameters are as follows:
Adjustment Range: ±5% AM Depth
Adjustment Resolution: 0.1%
Target Value: 50.0%
RF Frequency: 300.000000 MHz
RF Level: +10.0 dBm
Internal AM: ON
Modulation Frequency: 1 kHz
External Equipment: RF Modulation Analyzer (HP 8901A or equivalent)
When performing the front panel procedure, use the edit knob to adjust the AM depth
until the measured AM depth matches the target value. When performing the remote
procedure, the process is under the control of a program running on an IEEE-488 bus
controller.
The front panel display is reconfigured during the procedures. The target level is
displayed in the modulation field, the RF frequency is displayed in the frequency field,
the adjustment value is displayed in the amplitude field, and the CAL annunciator is
lit. The display is consistent for the front panel and remote procedures.
All adjustments update a temporary copy of the AM calibration factor. The copy in the
calibration memory is updated only after the store command is given explicitly. After
the store command has been given, the internal calibration factor is calculated from the
displayed adjustment value and is stored in the calibration memory. Subsequent AM
programming commands use the new calibration factor.
NOTE
Set the rear panel CAL/COMP switch to the 1 (on) position before
initiating an AM calibration procedure.
Front Panel AM Calibration Procedure 3-6.
The front panel AM calibration procedure is initiated by the following key sequence:
The display is reconfigured and several of the front panel controls are disabled or
operate differently than they normally do. Table 3-1 shows all of the active controls and
describes their function while the front panel AM calibration procedure is performed.
Perform the following to execute the front panel AM calibration procedure:
1. Set the rear panel CAL|COMP switch to 1 (on) position.
2. Enter special function 991 to initiate the AM procedure.
3. Connect the 6080A/AN's RF output to the modulation meter.
3-4
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