Reference Oscillator Calibration; Remote Programming Commands For Level Calibration Procedure - Fluke 6080A Service Manual

CLOSED-CASE CALIBRATION
CAL_LEVEL
CC_RPOWER
CC_FREQ?
CC_TARGET?
RFOUT
CC_SAVE
CC_EXIT
ERROR?
STATUS/STATUS?

REFERENCE OSCILLATOR CALIBRATION

The reference oscillator calibration procedures allow a single-point calibration of the
internal 10-MHz reference oscillator to be performed. A frequency counter is
connected to the 6080A/AN's RF output, and the reference oscillator calibration
factor is adjusted based on the counter reading. The procedure specific parameters are
as follows:
When performing the front panel procedure, use the edit knob to adjust the calibration
factor until the measured frequency 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 and is shown
below.
All adjustments update a temporary copy of the adjustment value. The copy in the
calibration memory is only updated 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.
3-14
Table 3-6. Remote Programming Commands for Level Calibration Procedure
COMMANDS
Adjustment Range: 256 counts (6 ppm minimum)
Adjustment Resolution: 1 count
Target Value: 100 MHz
RF Frequency: 100 MHz
External Equipment: Frequency Counter (Fluke 1953A or equivalent)
This procedure can be used only to adjust the frequency of the internal
reference oscillator. It cannot be used to adjust the frequency of the
optional high-stability or medium-stability references.
DESCRIPTION
Initiate the remote level calibration procedure
Send the power 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
NOTE
3-14.