Measuring the time between a start and a stop
condition on two separate channels is the basis
for all time interval measurements. In addition
to the fundamental function
Time Interval A to
B,
the counters also offer other channel
combinations and derived functions like
Pulse
Width
and Rise/Fall Time.
Time is measured between the
trigger point and the reset point. Accurate
measurements are possible only if the
hysteresis band is narrow.
Triggering
The set trigger level and trigger slope define
the start and stop triggering.
If Auto is on, the counter sets the trigger level
to 50% of the signal amplitude, which is ideal
for most time measurements.
Summary of Conditions for Reliable
Auto Once, that is freezing the levels de-
termined by
Auto Trig, is normally the
best choice when making time measure-
ments. Choose
Man Trig and press
AUTOSET once.
1x Attenuation. Selected automatically if
AUTOSET was used before to set the
trigger levels.
Even though the input amplifiers have high
sensitivity, the hysteresis band has a finite
value that would introduce a small timing
error for signals with different rise and fall
times, for instance asymmetrical pulse signals
like the one in Fig. 4-15. This timing error is
taken care of by using hysteresis compensation
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020
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