Input A Low Frequency Sensitivity Test Configuration; Input A Sensitivity Low Frequency Test - Racal Instruments 2251A Operator's Manual

4.1.6 Input A Sensitivity Test
4.1.6.0.1 Set the 2251A to its home state. Select 50 ohms input impedance for input A and
external frequency standard.
(Command String: IP ALI B1)
If Option 11 is installed connect the 2251A internal reference output to the external
signal source 10 MHz Input. Configure the external signal source to accept the
10MHz reference from the 2251A.
(Command String: IP ALI)
4.1.6.1 Connect the Function Generator to the 2251A as shown in Figure 4-1.
Figure 4-1, Input A Low Frequency Sensitivity Test Configuration
4.1.6.2 Apply the frequencies given in Table 4-1 to the counter. Verify that the 2251A gives
a stable reading within the tolerances given at less than the signal levels given.
Frequency
10 Hz
5 kHz
10 kHz
Table 4-1, Input A Sensitivity Low Frequency Test
4.1.6.3 Disconnect the test equipment.
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Signal level Resolution
25 mV rms 8
25 mV rms 8
25 mV rms 8
Tolerance
± 1 Hz
± 0.1 Hz
± 0.1 Hz
4-3