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4-6
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.
4.1.7.4
Connect the Signal Generator to the 2251A as shown in Figure 4-4.
Figure 4-4, Input B High Frequency Sensitivity Test Configuration
4.1.7.4.1
Set the 2251A measurement resolution to the values given in Table 4-4 and apply the
frequencies given in Table 4-4 to the counters input B. Verify that the 2251A gives
a stable reading within the tolerances given at less than the signal levels given.
Frequency
Signal level
Resolution
Tolerance
160 MHz
50 mV rms
9
± 1 Hz
100 MHz
25 mV rms
9
± 1 Hz
10 MHz
25 mV rms
8
± 1 Hz
100 kHz
25 mV rms
8
± 0.1 Hz
Table 4-4, Input B Sensitivity High Frequency Performance Limits
4.1.7.5
Disconnect the test equipment.
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Содержание 2251A
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