MR8740、MR8741_user_manual_eng_20191016H.pdf - 第354页

16.2 External I/O (MR8741 Only) 342 You can input external sign als as trigger source s. In addition, multiple MR8741s can be u sed for parallel synchronous operation. 1. Connect the cables for the co rresponding externa…

16.2 External I/O (MR8741 Only)

341

Chapter 16 External Control (MR8741 Only)

You can output a signal when a trigger event occurs. In addition, multiple MR8741s can be used for

parallel synchronous operation.

1. Connect the cables for the output signals to TRIGOUT and GND terminals.

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 [TRIG.OUT] item.

3. Select the output signal type for the trigger output terminal.

Select

4. When trigger event occurs, a pulse wave changing from the HIGH level (4.0 to

5.0 V) to the LOW level (0 to 0.5 V) is output from the TRIG OUT terminal.

: Triggering should occur when the signal voltage level changes from HIGH to LOW.

16.2.4 Trigger Output (TRIG OUT)

Signal Output Procedure

Pulse After LOW level output, the signal goes HIGH after a specified interval.

Level

After the trigger is established, a LOW level signal will be outputted during the waveform

retrieval.

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)

Pulse width Pulse width at pulse setting time : 2 ms ± 1 ms

Pulse width at level setting time: (sampling rate × no. of data

points after trigger) or more

Maximum input

voltage

50 VDC, 50 mA, 200 mW

HIGH

4.0 to 5.0 V

LOW

0 to 0.5 V

GND

TRIG OUT

10 k

5 V

1 ms or

greater

When using memory division, the trigger output (TRIG_OUT terminal output)

may output the Low level or output erratically in the following conditions.

• The time axis range is 5 s/div to 100 s/div

• The record (measurement) time is 5 ms or less

• Tracking wave display is [OFF].

16.2 External I/O (MR8741 Only)

342

You can input external signals as trigger sources. In addition, multiple MR8741s can be used for

parallel synchronous operation.

1. Connect the cables for the corresponding external input signals to the EXT.TRIG

and GND terminals.

See: "16.1 Connecting External Control Terminals (MR8741 Only)" (p.336)

2. In the Trigger Settings window, set External trigger to [On].

3. On the SYSTEM screen, open the [Environment] sheet and move the cursor to

the [EXT.TRIG] item.

4. Select whether the trigger event occurs on the rising edge () of the waveform or

the falling edge (

).

5. Short-circuit the EXT.TRIG terminal and GND, or input a HIGH level (3.0 to 5.0

V) or LOW level (0 to 0.8 V) pulse wave or rectangular wave to the EXT.TRIG

terminal.

A trigger event occurs on the rising or falling edge of the input waveform.

16.2.5 External Trigger terminal (EXT.TRIG)

Signal Input Procedure

Output signal HIGH level: 3.0 to 5.0 V, LOW level: 0 to 0.8 V

Pulse width HIGH level: 50 ns or greater, LOW level: 50 ns or greater

Maximum input

voltage

-0.5 to 7 V

HIGH

3.0 to 5.0 V

LOW

0 to 0.8 V

50 ns or greater

GND

150 pF

100 

3.3 k

5 V

EXT.TRIG

[ ] [ ]

[ ]: Rising setting [ ]: Falling setting

[ ][ ]

5 V

17.1 General Specifications of the Instrument

343

Chapter 17 Specifications

Basic Specifications

Specifications Chapter 17

17.1 General Specifications of the Instrument

Measurement functions • Memory Function (high-speed data saving)

• Recorder Function (real time recording)

• FFT Function (frequency analysis)

Maximum number of channels MR8740: Block I 32 analog channels + 8 logic channels, or

26 analog channels + 56 logic channels at a maximum (Together with the

logic channels the instrument provides, when 3 modules of Model 8973

Logic Unit are installed)

Block II 22 analog channels + 8 logic channels, or

16 analog channels + 56 logic channels at a maximum (Together with the

logic channels the instrument provides, when 3 modules of Model 8973

Logic Unit are installed)

MR8741: 16 analog channels + 16 logic channels, or

10 analog channels + 64 logic channels at a maximum (Together with the

logic channels the instrument provides, when 3 modules of Model 8973

Logic Unit are installed)

Number of modules MR8740: Block I Up to 16 modules

Block II Up to 11 modules

Restrictions

• Up to 4 modules of Model 8971 Current Unit can be installed.

• Block I: Up to 3 modules of Model 8973 Logic Unit can be installed in ev-

ery slot except those for Unit 9 through Unit 16.

Block II: Up to 3 modules of Model 8973 Logic Unit can be installed in

every slot except those for Unit 9 through Unit 11.

MR8741: Up to 8 modules

Restrictions

• Model 8971 Current Unit cannot be used.

• Up to 3 modules of Model 8973 Logic Unit can be installed.

Number of the instrument

logic channels

MR8740: Block I 8 (The input connectors of logic probes share the ground with the instru-

ment.)

Block II 8 (The input connectors of logic probes share the ground with the instru-

ment.)

Restrictions imposed when the instrument logic channels are used (com-

mon to block I and II)

• Measurement resolution of each measuring module decreases to 12 bits

when the module is installed in a slot for Unit 1 or Unit 2.

• No frequency measuring modules are available when the module is in-

stalled in the slots for Unit 1 or Unit 2.

• Installing Model MR8990 Digital Voltmeter Unit in both slots for Unit 1

and Unit 2 disables the instrument logic channels.

MR8741: 16 (The input connectors of logic probes share the ground with the instrument.)

• Installing Model MR8990 Digital Voltmeter Unit in both slots for Unit 1 and Unit 2 dis-

ables the instrument logic channels.

• Restrictions imposed when the logic instrument channels are used (when the logic

measurement is set to on)

Measurement resolution of each measuring module decreases to 12 bits when the

module is installed in a slot for Unit 1 or Unit 2.

No frequency measuring modules are available when the module is installed in the

slots for Unit 1 or Unit 2.

Memory capacity 16MW /channel

Maximum sampling rate 20 MS / s (All channels simultaneously)

Timebase accuracy ± 0.01% (Relative error between grid and time)

Clock functions Automatic calendar, automatic leap year adjustment, 24-hour clock

Accuracy: ± 100 ppm (Operated within the operating temperature range)

Reference value: ± 10 ppm (at 25°C)

Backup battery life Approx. 10 years (reference duration at 25°C) for clock and settings

Operating environment Indoors, Pollution degree 2, up to 2000 m (6562-ft.) ASL

Operating temperature and

humidity

0°C to 40°C (32°F to 104°F), 20 to 80% RH (non-condensation)