Racal Instruments 2251A Operator's Manual page 71

4.1.11 Ratio A/B Test
4.1.11.1 Set the 2251A to its home state. Select Ratio A/B as the measurement mode, 50 ohms
for input A input impedance, DC input coupling for input B, external frequency
standard and set the measurement resolution to three digits.
(Command String: IP RA ALI SRS3)
4.1.11.2 Connect the 2251A to the signal generator as shown in Figure 4-8. Set the signal
generator to 50 MHz, 100 mV rms. Verify that the counters measurement result is
50000 ± 10.
4.1.11.3 Disconnect the test equipment.
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Figure 4-8, Ratio A / B Test Configuration