Hioki MR8740-50, Instruction Manual

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217
External Sampling (EXT.SMPL)
12.2 External Sampling (EXT.SMPL)
Externally inputting the signal can control the sampling rate.
How to an input signal
1
Connect each of the EXT.SMPL and GND terminals to an external signal-outputting device
with wires.
2
> [Status] > [Condition]
3
Click the [External sampling] button to set it to [On] .
4
Click the box to the right of the [External sampling] box, and then from the list, choose
which direction to use for reception of the external sampling signal.
With the rising edge setting: [ ]
With the rising edge setting: [ ]
5
Input pulse waves or rectangular waves to the EXT.SMPL 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.
Available voltage
range
High level: 2.5 V to 10 V; low level: 0 V to 0.8 V
Pulse width High and low level: 50 ns or more
Response frequency 10 MHz or less
Maximum input
voltage
10 V DC
EXT. SMPL 600 Ω
10 pF
5 V
GND
3 kΩ
5 V
t
t
H
t
L
t
H
> 50 ns, t
L
> 50 ns, t > 100 ns
High
2.5 V to 10 V
Low
0 V to 0.8 V
• If a sampling signal with 5 MHz or more is inputted, trigger points are delayed by one sample.
• When Model 8968 High Resolution Unit is used, the anti-aliasing filter ( > [Channel] > [each Unit] >
[A.A.F.] ) setting of [On] is invalid.
12
Externally Controlling the Instrument