Adjustment procedures
Adjust DC calibration
1.
Use the equipment connection shown in the preceding
fi
gure.
2.
Verify communication between the controller and DSA8300 by entering the
following GPIB command:
*IDN
The instrument should respond with Tektronix and Firmware Version
information.
3.
Turn off the DSA8300 cal constant protection by entering the following GPIB
command:
SYST:PROT OFF
4.
Set the DSA8300 DC calibrator offset cal constant to 0 by entering the
following GPIB command:
CALCOMP:DOUBLE "DcCalOffsetAdj",0.0
5.
Wait 8 seconds, and then set the instrument DC calibrator Lsb cal constant to
1.0 by entering the following GPIB command:
CALCOMP:DOUBLE "DcCalLsbAdj",1.0
6.
Wait 8 seconds, and then set the instrument DC calibrator output to 0 Volts by
entering the following GPIB command:
CALIBRATE:DCCALIBRATOR 0.0
7.
Record the DMM reading.
8.
Set the instrument DC calibrator offset cal constant to -1 * DMM reading by
entering the following GPIB command:
CALCOMP:DOUBLE "DcCalOffsetAdj",(-1.0 * the DMM reading)
Example:
CALCOMP:DOUBLE "DcCalOffsetAdj", 3.2e-4
9.
Set the instrument calibrator to 1.0 V by entering the following GPIB
command:
CALIBRATE:DCCALIBRATOR 1.0
10.
Record the DMM reading (
reading1
).
11.
Set the instrument calibrator to -1.0 V by entering the following GPIB
command:
CALIBRATE:DCCALIBRATOR -1.0
12.
Record the DMM reading (
reading2
).
13.
Calculate the cal constant using the following equation: (–1.0 * Reading2
+ Reading1) ÷ 2.
14.
Set the instrument calibrator Lsb cal constant by entering the following GPIB
command:
CALCOMP:DOUBLE "DcCalLsbAdj", (cal constant calculated
in previous step)
DSA8300 Digital Serial Analyzer and Modules Service Manual
15
