3.5 Basic Operations
3-43 ZM2376
Applying a trigger (measurement start)
_TRIG_
When the trigger source is Man (manual) and the measurement has not been executed, if the
_TRIG_
key is pressed, the measurement starts and it is executed only once. One-time
measurement will take long time when the frequency is lower than 1Hz, or the number of
averaging count is large. Note that the last measured value is displayed during the measurement.
BUSY lamp
During measurement, the BUSY lamp lights up or blinks.
Trigger delay time: Trigger delay setting menu
The trigger delay time is the time from trigger up to signal acquisition start. The signal settling time
varies depending on the nature of DUT or required accuracy. For the trigger delay time, set long time
to the extent that the measured value does not vary even if the trigger delay time is changed a little.
Press the _SHIFT_
+ [TRIG MODE] keys to display the trigger setting menu, and select Delay
with a numeric key and the trigger delay setting menu (see below) will be displayed.
Trigger Delay : 0.4567s Current setting
0.0000s to 999.9999s Available value ranges
Input a numeric value to set the trigger delay time.
If a setting is made or the EXIT operation is performed, one-previous menu comes back.
If the measurement frequency > 20kHz, the settlement of the internal bridge by
connection/disconnection of DUT will take 10ms at maximum. If the measurement frequency ≤
20kHz, the settling time of the internal bridge can be ignored.
For high dielectric type capacitors or inductors with a core having hysteresis characteristics, it is
recommended to acquire the signal after at least one period of signal elapsed (1ms at 1kHz, or 8ms at
120Hz) since the measurement signal was applied to the DUT. It may take long time for settling if
dielectrics absorption of DUT is large.
When the DUT does not have hysteresis or dielectrics absorption, the settling time of signal is
determined by the following two factors:
1) Time constant determined by the output impedance or maximum drive current of ZM2376 and
the capacitance of DUT.
2) ZM2376 internal settling time
The ZM2376 output impedance and maximum drive current depend on the measurement range.
For details “3.5.6.3 Measurement range”
If the DUT is pure capacitance C or inductor L, the signal settles at the time constant C×Rd or L/Rd
where the ZM2376 output impedance is Rd. Make allowance for the settling time of 5 to 7 times the
time constant. The settling time will vary if the current is limited.
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