PERFORMANCE TESTS
5-4
PERFORMANCE TESTS
These tests are intended to measure the SR715/720's conformance with its published specifications. These
test results, along with the results of the functional tests, can be recorded on the test sheet at the end of this
section.
Necessary Equipment
Instrument Critical Specifications Recommended Model
Time Interval Counter Time Interval Accuracy SRS SR620
1 ns max
DC/AC Voltmeter 5 1/2 digit DC accuracy Fluke 8840A with Option -09
True RMS AC to 100 kHz
Resistance Decade Box Accuracy 0.02 % IET HARS-Q-6-1
1 Ω - 1 MΩ
Capacitance Decade Box Accuracy 0.05 % IET HACS-A-4-1000p
1000pF - 10µF
Fixture to BNC Adapter SRS SR728
BNC to stacking banana plugs (4) Pomona 3073
Test Conditions
Warm up time: At least 30 minutes
Temperature: 23 °C ± 5 °C
1. Frequency Accuracy
This test measures the accuracy of the different output frequencies. They should be within 0.01% (100
ppm) of the nominal value.
1) Set the SR715/720 to its default conditions ([Recall] [0] [ENTER]). Set the unit to constant voltage
mode, 1 kHz and remove any part from the fixture.
2) Install the SR728 BNC adapter on the fixture. Connect the Ih lead to the frequency counter.
3) Verify that the frequency counter reads 1 kHz ± 0.1 Hz (± 0.01%). Record the result.
4) Repeat this at 100 Hz, 120 Hz, 10 kHz and 100 kHz (SR720 only). The frequencies should all be
within 0.01% of the nominal frequency. Record the results.
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