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3–2
Testing Performance
The procedures in this section test measurement performance using Performance
Specifications given in chapter 1 as performance standards. Specifications applicable to
individual tests are noted at the test for reference.
Testing Interval
The performance test procedures may be performed for incoming inspection of the
instrument and should be performed periodically thereafter to ensure and maintain peak
performance. The recommended test interval is yearly or every 2,000 hours of operation.
See Also Chapter 4, “Calibrating and Adjusting,” for information about the calibration cycle.
Equipment Required
A complete list of equipment required for the performance tests is in the Recommended
Test Equipment table in chapter 1. Equipment required for individual tests is listed in
the test. Any equipment satisfying the critical specifications listed may be substituted
for the recommended model. The procedures are based on the model or part number
recommended.
Self-Test Verification
To verify system operation with high confidence, without the test equipment and time
required for performance tests, perform the self-tests. These internal tests verify many
functions of the oscilloscope.
To run the self-tests, enable the graphical interface, then select Self Test from the
Utilities menu. The Self Test drop down list box allows you to select Scope Self Tests,
Key and Knob Test, or LED Test. A message is displayed with the instruction to remove
all inputs to the instrument. During execution of the self-tests, the oscilloscope displays
diagnostic messages indicating the status of each test.
If one of the self-tests fails,
FAILED is displayed rather than PASSED, and a 16-bit
diagnostic code is displayed. This code is used by factory service personnel when
troubleshooting the main assembly. Failure of a self-test indicates an assembly failure.
The assembly must be replaced before you attempt performance verification. For more
troubleshooting information, refer to chapter 5, “Troubleshooting.”
Test Interval Dependencies
The test interval depends on frequency and severity of use and the environmental conditions under which
the instrument is used. In recording test results, you may find that the test interval could be shortened or
lengthened; however, such a decision should be based on substantial quantitative data.