28
2.
CNT+ et CNT- :counting of pulses
3.
PW+ et PW- :pulse width
-
the mathematical function associated:
MATH
-
the period, the positive duty cycle and the mathematical function:
_MATH
-
the period, the negative duty cycle and the mathematical function:
PER_DCY-_MATH
-
the positive pulse width, the counting of positive pulses, its reference and the mathematical function:
PW+_CNT+_MATH
-
the negative pulse width, the counting of negative pulses, its reference and the mathematical function:
PW-_CNT-_MATH
Duty cycle
Display of the measurement in % of a logical signal (TTL, CMOS, etc.)
DCY+ duty cycle =
DCY- duty cycle = T -
The DCY duty cycle mode is optimized to measure the active or inactive intervals of
switching signals or logical signals. Electronic fuel injection systems and switching power
supplies, in particular, are controlled by pulses of variable width that can be verified by a
duty cycle measurement.
Pulse counting
Depending on the triggering conditions of the frequency counter, calculation of the
positive or negative pulses
Minimum pulse duration 5µs
Counting up to 99999
Triggering threshold 10% of range except for range 1000 V
AC
This threshold is positive in
, negative in
Reset of CNT by long press on MEAS… For negative events, cross the leads.
The pulse width function
measures the duration during which the signal is low or high.
The waveform measured must be periodic; its curve must repeat at intervals of equal
duration.
Pulse width
Depending on the triggering conditions of the frequency counter, measurement of the
pulse width in ms.
Resolution 10µs
Minimum pulse width 100µs
Accuracy 0.05%
10µs Maximum duration of a period 12.5s
Triggering threshold 20% of the range except for the 1000 V
AC
range
For negative events, cross the leads.
T
Summary of Contents for Metrix MTX 3292B
Page 54: ...54...
Page 55: ...55 X04854A02 Ed 01 02 2019...
