4-19
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: FA ALI SRS3)
4.5.2.3
Connect the counter to the signal generator as shown in Figure 4-16.
Figure 4-16, Input A Amplifier Setup Configuration
4.5.2.4
Set the signal generator output to 100 MHz, 3.0 mV rms
4.5.2.5
Adjust R10 to obtain a stable reading of 100 MHz ± 0.1 MHz. Verify that the
counters GATE LED is flashing.
4.5.2.6
Turn off the RF output of the signal generator.
4.5.2.7
Set the counter resolution to eight digits (Command code SRS8).
4.5.2.8
Increase the signal generator output level to 13 mV rms.
4.5.2.9
Adjust R12 slowly clockwise until the counter measurement result starts to become
unstable. Turn R12 slowly counterclockwise until the counter measurement result is
stable, value 100 MHz ± 1Hz.
4.5.2.10
Reduce the signal generator output level to 7 mV rms and verify that the GATE LED
stops flashing. If the LED continues to flash, repeat steps 5.5.3.8 to 5.5.3.10.
4.5.2.11
Disconnect the test equipment.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
