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Service Procedures 167
Appendix D
Quick Performance
Check
The quick performance check is a combination of internal self-test and an
abbreviated performance test (specified by the letter Q in the performance
verification tests). This test provides a simple method to achieve high
confidence in the function generator's ability to functionally operate and meet
specifications. These tests represent the absolute minimum set of
performance checks recommended following any service activity. Auditing
the function generator's performance for the quick check points (designated
by a Q) verifies performance for “normal” accuracy drift mechanisms. This
test does not check for abnormal component failures.
To perform the quick performance check, do the following:
• Set the function generator to reset state (*RST).
• Perform a complete self-test (*TST?).
• Perform only the performance verification tests indicated with the
letter Q.
If the function generator fails the quick performance check, adjustment or
repair is required.
Performance
Verification Tests
The performance verification tests are recommended as acceptance tests
when you first receive the function generator. The acceptance test results
should be compared against the 1 year test limits. After acceptance, you
should repeat the performance verification tests at every calibration interval.
If the function generator fails performance verification, adjustment or repair
is required.
Frequency Verification
This test verifies the frequency accuracy of the two sources in the function
generator. All output frequencies are derived from a single generated
frequency, and only one frequency point is checked. The second test verifies
the burst rate frequency.
Set the function generator for each output indicated in the table below. Use
a frequency meter to measure the output frequency. Compare the measured
results to the test limits shown in the table. This is a 50 Ω output termination
test.
Table D-2. Frequency Verification
Agilent E1441A Measurement
Function Out
Term
a
Ampl Freq Burst
Rate
Burst
Count
Nominal Error
Q Sine wave 50 Ω 3.5 Vrms 1.00 kHz — — 1.00 kHz ± 0.01 Hz
Q Square wave 50 Ω 3.5 Vrms 1.00 kHz 500 Hz 1 CYC 500 Hz ± 5 Hz
a.The E1441A has a fixed output impedance of 50 Ω on the "Output" terminal. Use the
OUTPut:LOAD 50 | INFinity | MIN | MAX command to set the output termination. HIGH Z
assumes no load on output. 50 Ω assumes a 50 Ω ± 0.1 Ω load on output.