Initiate 6080A/AN calibration procedure
Initialize measurement equipment
Loop
Ask 6080A/AN for RF frequency
Exit loop if frequency is special end code "9E+09"
Get reading from measurement equipment
Send reading the 6080A/AN
End loop
Save calibration data
Exit calibration procedure
CLOSED-CASE CALIBRATION
Front Panel Calibration 3-2.
The bright-digit editing feature is used to perform the adjustments when performing a
front panel calibration procedure. Each calibration subsection describes the function
of the front panel controls during the procedure.
Remote Calibration 3-3.
The remote calibration procedures allow the signal generator to be calibrated in a
totally automated station. When equipped with the required measurement equipment
and controller software, the process is reduced to connecting the instrument cables and
executing the program.
The controller and signal generator work together in a tightly coupled system. The sole
function of the controller software is to obtain valid readings from the measurement
equipment and convert them into a format understood by the signal generator. The
controller software must ensure that every reading is settled and valid before sending it
to the signal generator.
The basic structure of a calibration program is shown in Figure 3-1.
Figure 3-1. Basic Structure of Calibration Program
The controller initiates the calibration procedure and initializes the measurement
equipment. Then it requests the signal generator's RF frequency and waits for a
response. When a response is received, the controller gets a reading from the
measurement equipment and sends it to the signal generator. The program remains in
the loop until the signal generator returns the end code in response to the frequency
query. The loop is then exited and the data is saved in the calibration memory.
The controller queries the signal generator's RF frequency at each step to synchronize
its actions with the signal generator and to determine when the procedure is complete.
When the signal generator receives a reading, it updates its internal settings and does
not respond to the next frequency query until it is ready for another reading. The
controller must wait for the signal generator's output to settle before it is allowed to
take another reading.
The signal generator continues to receive readings and make adjustments until it gets
two consecutive readings within the error tolerance for the procedure, at which time
the adjustment is considered valid. The signal generator notifies the controller of this
by returning the special end code of "9E+09 Hz" in response to the next frequency
query.
3-2
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