Tektronix DSA8200 Series, Service Manual

Page: 54 / 196

Adjustment Procedures
3- 4
DSA8200 Digital Serial Analyzer and Modules Service Manual
7. Enter the following GPIB command to set the instrument’s DC calibrator
offset cal constant to --1 * DMM reading:
CALCOMP:DOUBLE “DcCalOffsetAdj”,(--1.0 * the DMM reading)
Example: CALCOMP:DOUBLE “DcCalOffsetAdj”, 3.2e--4
8.
Wait 8 seconds then enter the following GPIB command to set the
instrument’s calibrator to 1.0 V:
CALIBRATE:DCCALIBRATOR 1.0
Record the DMM reading ( reading1 ).
9. Enter the following GPIB command to set the instrument’s calibrator to
--1.0 V:
CALIBRATE:DCCALIBRATOR --1.0
Record the DMM reading ( reading2 ).
Calculate cal constant as follows:
(
– 1.0 * Reading 2
+
Reading 1)
2
10.
Enter the following GPIB command to set the instrument’s calibrator Lsb cal
constant:
CALCOMP:DOUBLE “DcCalLsbAdj”,calculated result from Step 9.
11. Wait 8 seconds then enter the following GPIB command to save the DC
adjustments as follows:
CAL:SAVE:FACT:MAI
12. Update the mainframe calibration time/date/temperature stamp by entering
the following GPIB command:
CAL:UPDATEINFO:MAI
13.
Enter the following GPIB command to turn the instrument’s cal constant
protection on:
SYST:PROT ON
To verify that the DC calibration adjustment was successful complete the
following procedures:
1. Set the instrument’s DC calibrator to --1.0 V and verify as follows:
CALIBRATE:DCCALIBRATOR --1.0
2. Verify that the DMM reads --1.0 V 1 mV
3. Set the instrument’s DC calibrator to 1.0 V and verify as follows:
CALIBRATE:DCCALIBRATOR 1.0
4. Verify that the DMM reads 1.0 V 1 mV
DC Calibrator Adjust
Verification