MR8740、MR8741_user_manual_eng_20191016H.pdf - 第383页

371 Chapter 18 Maintenance and Service 14 18 T ransporting Pack the instrument so that it will no t sustain damage during shipping, and include a description of existing damage . We cannot accept responsibility for damag…

17.6 Specifications of Modules

370

10250-52A2PL: Sumitomo 3M products (SCSI-2 connector), (Centronics half-pitch 50 pins socket-

contact)

Recommended connection cable: KB-SHH2: Sanwa Supply (SCSI-2 connector) (Centron-

ics half 50-pin male)

Output Connector Specifications

Pin Signal name Pin Signal name

1 I_GND 26 I_GND

2 CH1 7 I_GND

3 CH2 28 I_GND

4 CH3 29 I_GND

5 CH4 30 I_GND

6 I_GND 31 I_GND

7 CH5 32 I_GND

8 CH6 33 I_GND

9 CH7 34 I_GND

10 CH8 35 I_GND

11 I_GND 36 I_GND

12 NC 37 I_GND

13 NC 38 I_GND

14 NC 39 I_GND

15 NC 40 I_GND

16 I_GND 41 I_GND

17 NC 42 I_GND

18 NC 43 I_GND

19 NC 44 I_GND

20 NC 45 I_GND

21 I_GND 46 I_GND

22 TEST2 (DIN03)I 47 I_GND

23 TEST3 (DIN02) 48 I_GND

24 NC 49 I_GND

25 NC 50 I_GND

Frame F_GND

CH1 to CH8: Pulse output

I_GND: Isolation GND (insulated GND)

F_GND: Non-Isolation GND (main instrument GND)

NC: No Connect

TESTn: Test pin DO NOT CONNECT

371

Chapter 18 Maintenance and Service

Transporting

Pack the instrument so that it will not sustain damage during shipping, and

include a description of existing damage. We cannot accept responsibility for

damage incurred during shipping.

Use the original packing materials when transporting the instrument, if possible.

Replaceable Parts

Certain parts require replacement periodically and at the end of their useful life:

(Useful life depends on the operating environment and frequency of use. Opera-

tion cannot be guaranteed beyond the following periods)

The fuse is housed in the power unit of the instrument. If the power does not turn

on, the fuse may be blown. If this occurs, a replacement or repair cannot be per-

formed by customers. Please contact your dealer or Hioki representative.

Maintenance and

Service Chapter 18

To avoid damage to the instrument, remove the USB memory stick before ship-

ping the instrument.

Part Life

Fan Motor

Approx. 60,000 hours

Power Source

Approx. 50,000 hours

Electrolytic

Capacitors

Approx. 45,000 hours

(The useful life of electrolytic capacitors varies greatly accord-

ing to the operating environment. In severe operating environ-

ments (40°C ambient temperature), degradation occurs in

about four years, so they should be replaced periodically.)

Lithium Battery

Approx. 10 years

This instrument contains a built-in lithium battery to back up

settings and the real-time clock. Have the battery replaced if

the date and time are found to lag substantially or if settings

are not retained when power is turned off and back on. Con-

tact your dealer or Hioki representative.

18.1 Trouble Shooting

372

18.1 Trouble Shooting

If damage is suspected, check the "Troubleshooting" section before

contacting your dealer or Hioki representative.

If Power and Operating Mouse Malfunction

Symptom Check Item, or Cause Remedy and Reference

The display does not

appear when you turn the

power on.

Is the power cord disconnected?

Are connections made correctly?

Verify that the power cord is connected

properly.

"2.4 Supplying Power" (p.55)

Cannot operate the instru-

ment with a mouse.

• Is the USB mouse connected?

• Are you using a hub or special

mouse?

• Is there a source of interference

nearby?

• Check the USB connector.

• If you are using a hub, connect the

mouse directly to the instrument.

Use an ordinary mouse.

• Move the mouse away from the source

of interference.

If the Display or Operations Malfunction

Symptom Check Item, or Cause Remedy and Reference

Data is not displayed on

an external LCD monitor.

• Is it connected properly?

• Is it a digital LCD monitor?

• Are you using a VGA-DVI adapter

cable?

• Check the connections and power of the

instrument and LCD monitor.

• An analog monitor (VGA output) cannot

be used. Use an LCD monitor with a DVI-

D (digital output) connector.

The monitor flickers.

• Is there a source of interference

nearby?

• Are you using a special LCD moni-

tor? (Although extremely uncom-

mon, flickering may be caused by

incompatibility with the LCD monitor.)

• Move the cable away from the source of

interference.

• Use an ordinary LCD monitor.

A waveform does not

appear when measure-

ment is started

• Is the “Pre-Trigger wait” message

displayed?

• Is the "Trigger wait" message dis-

played?

When pre-triggering is enabled, triggering is

ignored until the pre-trigger portion of the

waveform has been acquired. Recording

starts when a trigger occurs.

No changes occur in the

displayed waveform.

• Is the clamp sensor or connection

cable connected correctly?

• Is the vertical axis (voltage axis)

range set properly?

• Is the low-pass filter enabled?

Verify that the clamp sensor or connection

cable is connected correctly.

Verify the input channel settings.

While measuring with the

memory function, the dis-

played frequency is much

lower than the actual fre-

quency.

Aliasing may be occurring.

Change the timebase to use a faster sam-

pling rate.

"3.4.2 Time Axis Range and Sampling

Rate" (p.67)