Tektronix DSA8300 Service Manual page 43

DC Calibrator Adjust
Verification
DSA8300 Digital Serial Analyzer and Modules Service Manual
9. Set the instrument DC calibrator offset cal constant to -1 * DMM
reading by entering the following GPIB command:
"DcCalOffsetAdj",(-1.0 * the DMM reading)
Example:
CALCOMP:DOUBLE "DcCalOffsetAdj", 3.2e-4
10. Set the instrument calibrator to 1.0 V by entering the following GPIB
command:
CALIBRATE:DCCALIBRATOR 1.0
11. Record the DMM reading (reading1).
12. Set the instrument calibrator to -1.0 V by entering the following GPIB
command:
CALIBRATE:DCCALIBRATOR -1.0
13. Record the DMM reading (reading2).
14. Calculate the cal constant using the following equation: (–1.0 * Reading2
+ Reading1) ÷ 2.
15. Set the instrument calibrator Lsb cal constant by entering the following
GPIB command:
CALCOMP:DOUBLE "DcCalLsbAdj", (cal constant
calculated in previous step)
16. Wait 8 seconds, and then save the DC adjustments by entering the following
GPIB command:
CAL:SAVE:FACT:MAIN
17. Update the mainframe calibration time/date/temperature stamp by entering
the following GPIB command:
18. Turn on the instrument cal constant protection by entering the following
command:
SYST:PROT ON
To verify that the DC calibration adjustment was successful, complete the
following:
1. Set the instrument DC calibrator to -1.0 V by entering the following GPIB
command:
CALIBRATE:DCCALIBRATOR -1.0
2. Verify that the DMM reads -1.0 V ±1 mV
3. Set the instrument DC calibrator to 1.0 V by entering the following GPIB
command:
CALIBRATE:DCCALIBRATOR 1.0
4. Verify that the DMM reads 1.0 V ±1 mV
5. Set the instrument DC calibrator to 0.0 V by entering the following GPIB
command:
CALIBRATE:DCCALIBRATOR 0.0
6. Verify that the DMM reads 0.0 V ±0.1 mV
Adjustment Procedures
CALCOMP:DOUBLE
CAL:UPDATEINFO:MAIN
3–3