FREQ A, B
The counter measures frequency between 0
Hz and 400 MHz on Input A and Input B. The
Auto Trig function operates from 1 Hz
(default 100 Hz) to 300 MHz.
The Manual Trig covers the whole frequency
range
Frequencies above 100 Hz and up to 300
MHz are best measured using the Default
Setup. See page 2-16. Then Freq A will be
selected automatically. Other important
automatic settings are AC Coupling, Auto
Trig and Meas Time 200 ms. See below for
an explanation.
You are now ready to start
sing the most common function with a fair
chance to get a result without further
adjustments
Summary of Settings for Good
AC Coupling, because possible DC offset
is normally undesirable.
Auto Trig means Auto Hysteresis in this
case, (comparable to AGC) because
superimposed noise exceeding the normal
narrow hysteresis window will be
suppressed.
Meas Time 200 ms to get a reasonable
tradeoff between measurement speed and
resolution.
Some of the settings made above by recalling
the Default Setup can also be made by
activating the AUTOSET key. Pressing it once
means:
—
Auto Trig. Note that this setting will be
made once only if Man Trig has been se-
lected earlier.
Pressing AUTOSET twice within two seconds
also adds the following setting:
— Meas Time 200 ms.
Fig. 4-1 Frequency is measured as the
inverse of the time between one
trigger point and the next;
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020
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