Tektronix TLA Series, Service Manual

Page: 54 / 130

Performance Verification
4- 14
TLA Series Digitizing Oscilloscope Modules Service Manual
This procedure checks the DC gain accuracy of the DSO module.
SW test name DC_GAIN_ACCURACY
Equipment
required Voltage reference (item 7)
Precision BNC cable (item 12)
Dual banana-to-BNC adapter (item 6)
Capacitor, 0.1 F
1
(item 8)
Prerequisites Warm-up time: 30 minutes
The logic analyzer application is not running
The performance verification and adjustment software is loaded
Test equipment connected as shown in Figure 4--3
Power-up diagnostics pass
INTERNAL_CAL test passes
1
Install the 0.1 F capacitor across the voltage reference output terminals
to reduce noise.
DSO module
CH 1
--
+
Voltage reference
Dual banana-to-BNC
adapter
Precision BNC
cable
0.1 F Capacitor
Figure 4- 3: Initial setup for the DC gain accuracy test
1.
Verify that all of the prerequisites listed previously are met for the procedure.
2.
Follow the on-screen instructions to run the test for each channel on the DSO
module.
3.
After the test begins, make changes to test equipment settings and connec-
tions when requested by the on-screen instructions.
4.
Verify that all of the tests pass. If a test fails, check the Troubleshooting
section on page 4--12.
DSO Procedure 2:
DC Gain Accuracy