7351 Series Digital Multimeter Operation Manual
5.8.2 Trigger Source Selection
5-15
5.8.2
Trigger Source Selection
The trigger source is selected in ’SRC’ in the
category in
.
Trigger source
IMMED
Performs continuous measurement with a time period that is set by the sam-
pling rate.
MAN
Detects an event when the
key is pressed or the trigger signal is input
from the external trigger connector.
EXT
Detects an event when the trigger signal is input from the external trigger con-
nector (7351A, 7351E + Option 03).
BUS
Detects an event when the *TRG command or GET command is received from
the enabled USB or GPIB bus.
The following shows the parameters whose settings automatically change depending on the trigger
source setting.
IMMED
HOLD: OFF
MAN
HOLD: ON
EXT
HOLD: ON
BUS
HOLD: ON
Trigger key
If the
key on the front panel is pressed when this instrument is in the local state and HOLD
ON, the measurement starts. The trigger key can be used regardless of the trigger source selection.
Trigger event buffer
If triggers are input while this instrument is in the measurement state, one trigger event is buffered.
In this case, the operation is the same as when the measurement is complete at the same time a trigger
is generated.
5.8.3
Trigger Delay (Td)
Time from a trigger input to sampling start can be delayed by setting the trigger delay.
Because timing with other devices can be adjusted by using this function, the measurement can be started
after the input becomes stable.
Table 5-3 shows the trigger delay time and setting resolution.
The trigger delay is set in ‘DELAY’ in the
in
.
Table 5-3 Trigger Delay Time, Setting Resolution, and Accuracy
Trigger delay
setting
Resolution *1
Delay time accuracy
Ext trigger
Bus trigger
0 to 600 ms
10
s
0.8 ms or less + resolution
3.2 ms to 3.7 ms + resolution
600.1 m to 6 s
100
s
0.8 ms or less + resolution
3.2 ms to 3.7 ms + resolution
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