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3 Calibration Procedures Frequency Gain Verification Test Configuration: Frequency 6½ digits [SENSe:]FREQuency:APERture 1 1 Make sure you have read “DMM Test Considerations" on page 53. 2 Select the FREQUENCY function and set 6½ digits. 3 Select each range in the order shown below. Provide the input voltage and frequency indicated. Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for appropriate source settling.) Input Voltage 10 mV 1V [1] Frequency Range 100 Hz 100 mV 100 kHz 1V Quick Check Q Error from Nominal 24 hour 90 day 1 year ± 0.06 Hz ± 0.1 Hz ± 0.1 Hz ± 6 Hz ± 10 Hz ± 10 Hz [1] Verify only, No adjustment. For this test, isolate the calibrator’s output from earth ground. Q: Quick performance verification test points. 34980A Service Guide 59