MR8740T_user_manual_eng_20191016H.pdf - 第220页

215 External Input and Output External trigger terminal (EXT .TRIG) Externally inputting the trigger signal can trigger the instrument. Y ou can use this signal to control multiple instruments, achieving synchronous oper…

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214
External Input and Output
GND
TRIG OUT
100
kΩ
10 kΩ
5 V
High
4.0 V to 5.0 V
Low
0 V to 0.5 V
Pulse width
When the auto-range function is used, the instrument is triggered, outputting the TRIG OUT signal. Be careful
when performing auto-range measurement while using the TRIG OUT signals.
215
External Input and Output
External trigger terminal (EXT.TRIG)
Externally inputting the trigger signal can trigger the instrument. You can use this signal to control
multiple instruments, achieving synchronous operation.
How to an input signal
1
Connect each of the EXT.TRIG and GND terminals to an external signal-outputting device
with wires.
Refer to “2.3 Connecting the External Control Terminals” in Quick Start Manual.
2
> [Trigger] > [Common]
3
Click the [Trigger] button to set it to [On].
3
4
12
Externally Controlling the Instrument
216
External Input and Output
4
Click [External trigger].
The setting dialog box will appear.
(1)
(2)
(3)
(1) Set [External start trigger] to [On].
(2) Click the box to the right of the [External start trigger] box, and then from the list, choose
which direction to use for reception of the external trigger.
With the rising edge setting: [
]*
With the falling edge setting: [
]*
(3) Click the [Filter] box, and then choose a lter setting from the list.
5
Connect the EXT.TRIG terminal and GND, or input the pulse waves or rectangular waves to
the EXT.TRIG terminal. The signal shall have a high-level voltage of between 2.5 V and 10 V
and a low-level voltage of between 0 V and 0.8 V.
The instrument accepts the external trigger on the rising or falling edge of the input waveform.
Available voltage
range
High level: 2.5 V to 10 V; low level: 0 V to 0.8 V
Pulse width Whit the lter
disabled
High level: 1 ms or more; Low level: 2 μs or more
With the lter
enabled
High and low level: 2.5 ms or more
Maximum input
voltage
10 V DC
[ ]* [ ]*[ ]* [ ]*
[ ]*:
[ ]*:
5 V
EXT. TRIG
5 V
3 kΩ
9 kΩ
22 pF
GND
High
2.5 V to 10 V
Low
0 V to 0.8 V
With the rising edge setting
With the falling edge setting
*: When the trigger logical-condition is set to [AND], [High] or [Low] is displayed.