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4.5.4
Input C Amplifier Setup Procedure
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.
4.5.4.1
Connect the signal generator to the counter as shown in Figure 4-18.
4.5.4.2
Set R27 on the Channel C amplifier board fully clockwise.
4.5.4.3
Select Frequency C as the measurement function (Command code FC).
4.5.4.4
Set the signal generator output to 1 GHz, 10.0 mV rms.
4.5.4.5
Adjust R27 slowly clockwise until the GATE LED starts to flash and the
measurement result is 1GHz ±10 Hz.
4.5.4.6
Turn off the signal generator output. Reduce the signal generator output level to
9.0 mV rms.
4.5.4.7
Turn on the signal generator output and verify that the 2251A is not counting. If the
counter continues to count, repeat steps 5.5.5.4 to 5.5.5.7.
4.5.4.8
Disconnect the test equipment.
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Figure 4-18, Input C Setup Configuration
4-21
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