MR8740、MR8741_user_manual_eng_20191016H.pdf - 第351页

16.2 External I/O (MR8741 Only) 339 13 Chapter 16 External Control (MR8741 Only) 15 16 4. The signal for the specified stat e is output. Output signal Open drain output (with voltage output) active LOW Output voltage ran…

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16.2 External I/O (MR8741 Only)
338
Signals can be output that indicate the MR8741 judgment state.
1. Connect the GO/OUT1, NG/OUT2, and GND terminals to the device(s) to be
controlled by single wires.
See: "16.1 Connecting External Control Terminals (MR8741 Only)" (p.336)
2. On the SYSTEM screen, open the [Environment] sheet and move the cursor to
the [GO/EXT.OUT1] or [NG/EXT.OUT2] item.
3. Select the conditions under which the instrument outputs a signal.
(when the [GO/EXT OUT1] item is selected)
Select
GO evaluation result output (low level output) is held until the next measurement starts.
(when the [NG/EXT OUT2] item is selected)
Select
NG evaluation result output (low level output) is held until the next measurement starts.
16.2.2 External Output (GO/OUT1) (NG/OUT2)
Signal Output Procedure
Measure A LOW signal is output when the judgment result is GO (pass).
Waveform
Evaluation
A LOW signal is output when the waveform evaluation result is GO (pass).
Value Evalua-
tion or Wave-
form
Evaluation
A LOW signal is output when either the value calculation or waveform calculation
evaluation result is GO (pass).
Value Evalua-
tion and Wave-
form
Evaluation
A LOW signal is output when both the value calculation and waveform evaluation
result are GO (pass).
Error
Output a LOW level signal when an error occurs.
Busy
A LOW signal is output when external start operation is disabled, such as during
startup and saving.
Trigger
Output a LOW level signal while instrument is waiting for a trigger.
Measure
A LOW signal is output when the judgment result is NG (fail).
Waveform
Evaluation
A LOW signal is output when the waveform evaluation result is NG (fail).
Value Evalua-
tion or Wave-
form
Evaluation
A LOW signal is output when either the value calculation or waveform calculation
evaluation result is NG (fail).
Value Evalua-
tion and Wave-
form
Evaluation
A LOW signal is output when both the value calculation and waveform evaluation
result are NG (fail).
Error
Output a LOW level signal when an error occurs.
Busy
A LOW signal is output during measurement and saving, and when it’s finished, a
HIGH signal is output.
Trigger
Output a LOW level signal while instrument is waiting for a trigger.
Calibration
1 kHz output for calibrating Model 9665 10:1 Probe and the 9666 100:1 Probe.
16.2 External I/O (MR8741 Only)
339
13
Chapter 16 External Control (MR8741 Only)
15
16
4. The signal for the specified state is output.
Output signal Open drain output (with voltage output) active LOW
Output voltage
range
HIGH level: 4.0 to 5.0 V, LOW level: 0 to 0.5 V
(current value:15 mA)
Maximum input
voltage
50 VDC, 50 mA, 200 mW
HIGH
4 to 5.0 V
LOW
0 to 0.5 V
Output period
HIGH
4 to 5.0 V
LOW
0 to 0.5 V
1 ms
500 s 500 s
Probe Calibration Active
Probe Calibration Inactive
GND
GO/OUT1
NG/OUT2
10 k
10 k
5 V
16.2 External I/O (MR8741 Only)
340
This applies to only the Memory function of MR8741.
The sampling speed can be controlled by applying an external signal.
1. Connect the cables for the corresponding output signals to SMPL and GND terminals.
2. On the SYSTEM screen, open the [Environment] sheet and move the cursor to
the [EXT.SMPL] item.
3. Select whether the sampling event occurs on the rising edge () of the waveform
or the falling edge (
).
4. Input HIGH level (3.0 to 5.0 V) and LOW level (0 to 0.8 V) pulse waves or rectan-
gular waves to the EXT.SMPL terminal.
Data is sampled on the rising edge or falling edge of the input waveform. Note
that the sampling frequency is limited by the selected edge.
For proper operation, pulse width must be at least as shown in the following table.
16.2.3 External Sampling (SMPL)
Signal Input Procedure
Minimum external sampling pulse width
Setting
(EXT.SMPL)
Pulse width
When the Roll Mode is set to
[On]
When the Roll Mode is set to
[Off]
t
H
t
L
t t
H
t
L
t
> 5 s> 5 s> 10 s > 50 ns > 50 ns > 100 ns
> 5 s> 5 s> 10 s > 50 ns > 50 ns > 100 ns
Voltage range HIGH level: 3.0 to 5.0 V, LOW level: 0 to 0.8 V
Pulse width HIGH, LOW level: 50 ns or greater
Response frequency 10 MHz or lower
Maximum input voltage
-0.5 to 7 V
HIGH
3.0 to 5.0 V
SMPL
LOW
0 to 0.8 V
100
150 pF
5 V
GND
t
t
L
t
H
t
H
> 50 ns t
L
> 50 ns t
> 100 ns
3.3 k
5 V
• When a sampling signal of 5 MHz or greater is input, trigger points are
delayed by 1 sample.
• When set to [Auto] or [On], the Roll Mode can be used with external sam-
pling. However, it is disabled if the external sampling input is faster than 100
kHz, to avoid degraded sampling accuracy.
• The anti-aliasing filter (A.A.F) is disabled regardless of its setting.
See:"7.9.1 Setting the Anti-aliasing Filter (A.A.F)" (p.162)
• When Roll Mode is set to ON, externally sampled signals will not be accepted
for the following periods:
(1) 150 s to 200 s after the first sampling clock has been entered, and
(2) Clock 2 when no signals are detected in the period (1) above.
• When external sampling is valid, the output settings of Models MR8790,
MR8791, and U8793 can not be updated.