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6 Maintenance and Service
6
Maintenance and Service
6.1 Repair, Inspection, and Cleaning
DANGER
Customers are not allowed to modify, disassemble, or repair the instrument.
Doing so may cause fire, electric shock, or injury.
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Calibrations
IMPORTANT
Periodic calibration is necessary in order to ensure that the instrument provides correct measurement results of the specified accuracy.
The calibration frequency varies depending on the status of the instrument or installation environment. We recommend that the calibration frequency is determined in accordance with the status of the instrument or installation environment and that you request that calibration be performed periodically.
Replacement parts and longevity
The longevity of the instrument varies depending on the usage environment and frequency.
Note that operation within the following period of time is not guaranteed. When replacing the part, contact your authorized Hioki distributor or reseller.
Backlight
Parts Longevity
Approx. 50,000 hours
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Repair, Inspection, and Cleaning
Cleaning
• To clean the instrument, wipe it gently with a soft cloth moistened with water or mild detergent.
• Wipe the display gently with a soft, dry cloth.
IMPORTANT
Never use solvents such as benzene, alcohol, acetone, ether, ketones, thinners or gasoline, as they can deform and discolor the case.
Disposal
Handle and dispose of the instrument in accordance with local regulations.
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Troubleshooting
6.2 Troubleshooting
• When a malfunction of the instrument is suspected, check the information in “Before sending the instrument for repair” and then, if necessary, contact your authorized Hioki distributor or reseller.
• When sending the instrument for repair, remove the batteries and pack it carefully to prevent damage during transportation.
Include cushioning material so the instrument cannot move within the package. Be sure to include details of the problem.
Hioki cannot be responsible for damage that occurs during transportation.
Before sending the instrument for repair
Symptom
Nothing appears in the display.
Or the display disappears after a short time.
A numerical value appears when nothing is connected.
Check and/or remedy
Check that the batteries are not exhausted.
Replace with new batteries. (p. 26)
Check that the auto power save function has not been activated.
Check the setting of the auto power save function.
(p. 70)
When the measurement terminal is open during
DC voltage (DCV) measurement or AC voltage
(ACV) measurement in the 60 mV range or 600 mV, a random value is displayed. This does not indicate a malfunction of the instrument. When the probe is connected to the measurement target, a normal numerical value is displayed. A high-input impedance voltmeter is used in the instrument for highly sensitive measurement. Consequently, external noise, such as inductive noise, appears as a numerical value.
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Troubleshooting
Symptom
(Current measurement)
The measured value does not appear.
(Except the current measurement)
The measured value does not appear.
Even after the connection or measurement, 0
(zero) still appears.
Even after short circuit of the probe, the measured value does not appear.
Zero adjustment is impossible.
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• Check that the test leads have been inserted at the ends.
Check and/or remedy
Check that the fuse is not blown.
Replace with a new fuse specified by our company.
(p. 106)
Check that the fuse holder is not deformed.
When removing the fuse, the holder is deformed if excessive force is applied. Pinch it with needlenose pliers and restore the shape of the fuse holder.
Check that the test lead is not broken.
Perform the continuity check to confirm the continuity of the test leads. (p. 34)
If the test lead is broken, replace the lead.
Check that the measurement method is correct.
• Check that the fuse is not blown. (p. 35)
If no problems have been found, the circuit may be malfunctioning. Send the instrument for repair.
The fuse may be blown.
Check method: “3 Check that the fuse is not broken.” (p. 35)
If the fuse is blown, replace with the specified fuse.
(p. 106)
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Troubleshooting
Symptom
The display does not stabilize and the value fluctuates; it is difficult to read the value.
Check and/or remedy
The display does not stabilize due to the influence of noise and/or input signals.
Set the display update slower (press SLOW for
1 second) so that the display fluctuation can be eliminated. (p. 59)
[-----] appears in the display.
Less than 5% of each range is outside of the guaranteed accuracy at AC voltage (V AC, mV AC),
DC+ACV measurement, and AC (ACμA, ACmA,
ACA).
Less than 15% of each range is outside of the guaranteed accuracy at AC clamp measurement.
The measured value does not stabilize if the measurement signal is small.
[----] appears when the rotary switch position is not confirmed. Set the rotary switch to the proper position.
The display does not stabilize due to the influence of noise and/or input signals.
The measured value of the frequency does not stabilize.
The range cannot be changed.
Turning on the power brings up the error display.
When nothing is connected, the error display appears.
The measurement range cannot be changed when
[REL] is lit. To change the range, press REL for at least 1 second to reset the REL function.
Reset the instrument. (p. 76)
If the same symptom still occurs even after resetting the instrument, send the instrument for repair.
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Troubleshooting
Other inquiries
Question
Would like to perform zero adjustment.
Would like to replace the fuse.
Would like to know how to obtain the fuse.
Can rechargeable batteries be used?
Solution
Using the relative value display function, zero adjustment can be performed. (p. 64)
These are available at authorized Hioki distributors or resellers.
Would like to control multiple instruments with 1 PC.
The instrument cannot communicate with the PC.
Would like to know commands.
Would like to perform communication using own software.
Rechargeable batteries can be used. However, the discharge characteristic of these batteries is different from that of alkaline batteries. Be aware that the remaining battery power display does not function properly.
To communicate with the instrument, the optional
DT4900-01 Communication Package is required. It is possible to control multiple instruments via USB ports.
• Is the communication setting between the instrument and the PC correct?
• Are the baud rate and parity check set correctly?
(p. 72)
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• Is the USB cable connected correctly? (p. 72)
Are the light receiving and emitting parts clean?
To communicate with the instrument, the optional
DT4900-01 Communication Package is required.
For details on commands, see the communication specifications in the CD accompanied by the communication package. These can also be downloaded from our Internet website.
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Error Display
6.3 Error Display
Error display
Err 001
Err 002
Err 004
Err 005
Description Solution
ROM error
Program
ROM error
Adjustment data
EEPROM error
Memory data
ADC error
Hardware malfunction
When the error appears in the display, it is necessary to solve by the actions below.
• Replace with new batteries.
(p. 26)
• Reset the instrument. (p. 76)
If the same symptom still occurs, it is necessary to repair the instrument.
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For other warning displays, refer to “1.4 Alarm Display and Battery
Indicator” (p. 23).
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Replacing Fuses
6.4 Replacing Fuses
If a fuse is blown, replace it with a new one as follows.
For details on how to check that the fuse is blown, see “3 Check that the fuse is not broken.” (p. 35).
WARNING
Replace the fuse only with one of the specified type, characteristics, rated current, and rated voltage.
Do not use fuses other than those specified (especially, do not use a fuse with higher-rated current) or do not short circuit and use the fuse holder. Doing so may damage the instrument and result in personal injury.
Specified fuses
For µA/mA terminal
(DT4281, DT4282)
Rating Resistance
630 mA/
1000 V
Approx.
1.2 Ω
For A terminal
(DT4282)
11 A/
1000 V
0.1 less
Ω or
Specifications
Manufacturer: HOLLYLAND
Breaking characteristic:
Fast-blow type
Breaking capacity:
50 kA AC/ 30 kA DC
Size: φ 10.3 mm × 38 mm
The fuses can be purchased via authorized Hioki distributors or resellers.
When removing the fuse, do not apply excessive force on the fuse holder. If the fuse holder is deformed, the connection becomes poor and the instrument cannot measure the current.
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Replacing Fuses
CAUTION
When replacing the fuse, do not allow foreign matter to enter the instrument. It may cause a malfunction.
1 Remove the test leads from the instrument.
2 Set the rotary switch to
OFF.
Screws
Rear
3 Using a Phillips screwdriver, remove the screws (2 locations) from the battery cover.
4 Remove the battery cover.
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µA/mA terminal fuse (Blue label)
5 Insert a slotted screwdriver or a similar tool (from the direction of the arrow in the left figure), and remove the fuse.
A terminal fuse
(Red label)
6 Attach a new fuse.
7 Reattach the battery cover.
8 Secure the cover with the screws.
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