Connect the pulse generator to a power
Connect one side of the power splitter to
Input A on the counter using a coaxial ca-
ble.
Connect the other side of the power split-
ter to Input B on the counter.
Settings for the pulse generator:
— Amplitude = 2 Vpp, (high level +2 V and
low level 0 V)
— Period = approx. 1 ms
— Duration = approx. 50 ns
— Rise time = 2 ns
Restore the timer/counter's default settings
and make the following changes:
Press STAT/PLOT key to the right of the
display.
Settings for INPUT A and INPUT B:
The standard deviation (Std) should be <100
ps (90 & 90XL) or <70 ps (91).
Connect an oscilloscope to the 10 MHz
output on the rear of the counter. Use a
coaxial cable and 50 termination.
The output voltage should be sinusoidal
and >1Vp-p, typically 1Vrms.
Recall the DEFAULT settings.
Connect a stable 10 MHz signal (e.g REF
OUT from another counter) to input A.
Connect a 10 MHz, 100 mV
RMS
, (0.28
VP-P) signal from the LF synthesizer to
Select Ext Ref. by keying in the
SETTINGS Meas Ref External
The display should show 10 MHz.
Change the external reference frequency
The counting should continue, and the
display should still show 10 MHz.
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020
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