User Manual 9250
3-4 Portrayal
Warm-up Period
Most instruments are subject to small amount of drifts when first
turned on. To ensure accuracy, turn on the power to the Model 9250
and allow it to warm-up for at least 10 minutes before beginning the
performance test procedure.
9250 Configuration
for the Tests
The 9250 is tested using the factory recommended configuration. The
instrument should be configured as follows for the performance tests:
Input impedance = 50
Ω
; Output impedance = 50
Ω
; Gain = 10;
Coupling = DC. Other configurations can be tested but slight
degradation of performance should be considered, as specified in
Appendix A
Recommended
Test Equipment
Recommended test equipment for troubleshooting, calibration and
performance checking is listed below. Test instruments other than
those listed may be used only if their specifications equal or exceed
the required characteristics.
Table
33-
31, Recommended Test Equipment
Equipment
Model No.
Manufacturer
Oscilloscope LT342
LeCroy
Distortion Analyzer
6900B
Krohn Hite
Digital Multimeter
2000
Keithley
Freq. Counter
6020
Tabor Electronics
Spectrum Analyzer
E4411
HP
Pulse Generator
8500
Tabor Electronics
Performance Check
Procedures
Use the following procedures to check the Model 9250 against the
specifications. A complete set of specifications is listed in Appendix
A. The following paragraphs show how to set up the instrument for the
test, what the specifications for the tested function are, and what
acceptable limits for the test are. If the instrument fails to perform
within the specified limits, the instrument must be calibrated or tested
to find the source of the problem.
