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General & Technical FAQ

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The pointer does not deflect. (=Unable to measure.)

Check the continuity of test leads.
If there is a break, replace the faulty test lead.
How to check: Set to the resistance range and short the test leads.

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Unable to measure the current.

Check the fuse for a break. If yes, change it to a new rated fuse as specified.

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Unable to measure the resistance.

Check the battery voltage.
If the voltage is low, change it to a new battery.

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The pointer moves abnormally.

The cover over the pointer may be electrized. Wipe the cover with the cloth or apply
the antistatic additives or the detergent diluted with water.

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The pointer does not move to zero even by the zero ohm adjustment knob.

Check the battery voltage.
If the voltage is low, change it to a new battery.


The cover over the pointer may be electrized. Wipe the cover with the cloth or apply the antistatic additives or the detergent diluted with water.

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When the power is tuned on, nothing is displayed in the LCD.

Check if the batteries are set appropriately.
Set the batteries propoerly.
Check if the battery is exhausted.
If yes, replace with new batteries.

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The readings vary at the DC voltage range when the test is off.

This is normal condition.
DC value varies by the influence of noise.

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The readings do not vary when the test is on.

Check the continuity of test leads.
If there is a break, replace the faulty test lead.
How to check: Set to the resistance range and short circuit the test lead.

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The pointer does not deflect. (=Unable to measure.)

Check the continuity of test leads.
If there is a break, replace the faulty test lead.
How to check: Set to the resistance range and short the test leads.

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Unable to measure the resistance.

Check the battery voltage. If the voltage is low, replace the batteries.
Change it to a new battery.

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The readings fluctuate when measuring current.

Check if the jaws are closed properly.
If no, close the jaws properly.


Check if an object stick to the jaw tips.
If yes, remove the oject from the jaw tips.

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The transformer jaws beat when measuring large current.

This is normal condition.

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The pointer moves abnormally.

The cover over the pointer may be electrized.
Wipe the cover with the cloth or coat the cover with an anti-electrostatic agent or the detergent diluted with water.

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The pointer does not move to zero even by the zero ohm adjustment knob.

Check the battery voltage.
If the voltage is low, change it to a new battery.


The cover over the pointer may be electrized. Wipe the cover with the cloth or apply the antistatic additives or the detergent diluted with water.

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When the power is turned on, nothing is displayed in the LCD.

Check if the batteries are set appropriately.
Set the batteries propoerly.


Check if the battery is exhausted.
If yes, replace with new batteries.

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When the range is set to DC voltage, the readings vary although measuring nothing.

This is normal condition.
DC value varies by the influence of noise.

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The readings remain displayed in the LCD.

Check if the data hold switch remains on.
Turn off the data hold switch.


Check if the peak hold switch remains on.
Turn off the peak hold switch.

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Unable to measure. ("nc" is displayed.)

Check if a clamp sensor is connected to the leak logger properly.
Insert the sensor into the connector terminal firmly.

KEW 5010 doesn't recognize the voltage Sensor

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Unable to measure. ("Err" is displayed.)

Sensor other than Voltage Sensor may be connected to CH1 under the setting for Power Quality Analysis mode for KEW 5020.

Only the Voltage Sensor can be used under Power Quality Analysis mode.

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Inaccurate readings

Check if a clamp sensor is connected properly.
Insert the sensor into the connector terminal firmly.

Check if the jaws are closed properly.
If no, close the jaws properly.

Check if an object stick to the jaw tips.
If yes, remove the oject from the jaw tips.

Check if the Scale function is in operation.
When the "SCAL" symbol is displayed in the LCD, the measured value x(times) the scale value will be displayed.
Turn off the scale function.
(MODEL 5000/5001 Only)

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Nothing is displayed in the LCD.

Check the battery voltage.
If the voltage is low, replace the batteries.

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Battery symbol is blinked in the LCD.

Check the battery voltage.
If the voltage is low, replace the batteries.

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The readings fluctuate.

Check the battery voltage.
If the voltage is low, replace the batteries.

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When the leak logger is connected to the PC using the USB cable, the leak logger connected is not detected in the logger list.

Check if the USB cable is connected correctly.
If no, connect the USB cable correctly.

Check if the USB driver is installed.
If no, install the USB driver correctly.

Check if the USB driver is failed to be installed on the PC.
If the installation is failed, firstly delete the USB driver installed and re-install it.
Refer to the "M5000_QA001E.pdf" for details.

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When other USB device is connected, the PC goes to install the KEW LOGGER driver. How to delete entirely the KEW LOGGER USB driver?

Use the "Add/Remove Programs" tool in Control Panel to delete "FTDI FTD2XX USB Drivers".
Furthermore, delete the device driver information file which is copied in the INF folder under Windows System folder.
Refer to the "M5000_QA002E.pdf" for details.

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When trying to transmit the data, the following message appears. "Remove and insert the USB cable once."

Sometimes the static electricity may cause an error to the USB connection.
Follow the message and transmit the data again.

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When installing the USB driver with the hardware WindowsXP, the following remark appears. "The software you are installing for this hardware: KEW LEAK LOGGER 5000/5001 has not passed Windows Logo testing to verify its compatibility with Windows XP."

Click "Continue Anyway" to continue the installation.
As operation check was done, no problem shall happen.

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The pointer does not deflect when testing BATT. CHECK.

Check the battery voltage.
If the voltage is low, change it to a new battery.

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POWER-ON INDICATION LED does not light up when testing insulation.

Check if the batteries are set appropriately.
Set the batteries propoerly.

Check if the test leads are firmly inserted into the terminal of the instrument.
If not, insert the test leads firmly into the terminal of the instrument.

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POWER-ON INDICATION LED does not light up when testing AC voltage.

POWER-ON INDICATION LED will not light up when testing AC voltage.

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The pointer deflects only at testing BATT. CHECK.

Check the continuity of test leads.
If there is a break, replace the faulty test leads.
How to check: Set to the resistance range and short the test leads.

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The instrument sounds when measuring.

This is normal condition.
The transformer inside may generate sound, when testing with a high voltage.

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The pointer moves abnormally.

The cover over the pointer may be electrized. Wipe the cover with the cloth or apply the antistatic additives or the detergent diluted with water.

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When the power is tuned on, nothing is displayed in the LCD.

Check if the batteries are set appropriately.
If no, set the batteries propoerly.

Check if the battery is exhausted.
If yes, replace with new batteries.

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The pointer does not deflect. (=Unable to measure.)

Check the continuity of test leads.
If there is a break, replace the faulty test lead.
How to check: Set to the resistance range and short the test leads.

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When selecting Earth Voltage range, the LED lights up although the test leads is not connected.

This is normal condition.
The LED is designed to light up at the Earth Voltage range in order to avoid omitting to turn the switch to the OFF position.

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At the earth resistance ranges. Even though the prove is not connected, when the test button is pressed the LED lights up and the pointer deflects to the end.

This is not a fault. This operation is due to the inner short-circuit.

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When measuring the earth resistance, the OK lamp does not light up.

Check if the test leads are firmly connected with the unit.
If no, connect the test leads firmly to the tester.

Check if the test leads are firmly connected to the earth spikes.
If no, connect the test leads firmly to the earth spikes.

Check if the part where the earth spikes are stuck is enough moist.
If no, give enough water where the earth spikes are stuck.

Check the continuity of test leads.
If there is a break, replace the faulty test lead.
How to check: Set to the resistance range and short the test leads.

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The pointer moves abnormally.

The cover over the pointer may be electrized. Wipe the cover with the cloth or apply the antistatic additives or the detergent diluted with water.

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When the power is tuned on, nothing is displayed in the LCD.

Check if the batteries are set appropriately.
If no, set the batteries propoerly.

Check if the battery is exhausted.
If yes, replace with new batteries.

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Communication between KEW Windows for KEW6305 and KEW6305 unit fails while using Bluetooth communication.

Check the pairing connection is established or not. For the pairing procedure, please refer to the manuals of your Bluetooth devices or "KEW6305_QA001E.pdf" file.

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When you cancel the install operation in progress or fail to install the USB driver, it cannot be reinstalled.

First, please remove the USB driver, and reinstall it.
Please refer to "M6300_QA001E.pdf" for further details.

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Wish to remove the USB driver for KEW POWER METER completely since the install of the driver for "KEW POWER METER 6300" starts automatically when connecting other USB devices.

In Control Panel, click Add/Remove Programs, and remove "FTDI FTD2XX USB Drivers".
Then search and delete the Device Driver files which are copied in the INF folder in the Windows system folder.
Please refer to "M6300_QA002E.pdf" for further details.

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When installed the KEW POWER PLUS software, the personal computer did not recognize the Model 6300.

There is a possibility that the USB driver is not installed.
Please download the driver via the CD supplied.
Normally, when installed the software, the USB driver will be also automatically installed.
In the case that the USB driver only was deleted or to use more than two units of model 6300 with one personal computer, it is necessary to re-install the USB driver.

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When transferring the data between the model 6300 and the personal computer, the display indicates "Timer out error".

Please check if the model 6300 function switch is set at SET UP range.
When communicating with the personal computer, it is necessary to set at the SET UP range.

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Recorded data cannot be transferred to the personal computer.

Only the recorded data in the internal memory can be transferred to the personal computer via the USB cable. The recorded data in the CF card cannot be transferred directly to the personal computer. To transfer the recorded data you have to use the card reader model 8319.

*Other card readers available in the market are usable.

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When inserted the CF card, Model 6300 does not recognize the CF card. At the setting for CF card at the item No.19 to select "use" or "not use", the key indicator can not be changed from "off" to "on".

Do you use a CF card which Kyoritsu did not check and confirmed the operation?
Please refer to here for the CF cards which Kyoritsu checked the operation with Model 6300.

Are you formatting the CF card via computers?
It is possible that a CF card which was formatted via a personal computer cannot be used with model 6300. Please format the CF card which was formatted via a personal computer or the brand new CF card as per the procedure described in Setting 20 (Formatting of CF card).

*When the CF is formatted, all the data recorded in the CF card will be deleted.

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How to reset the file number starting with "001"?

It is possible to put back the file number to 001 at the Setting 23 (System reset).

CAUTION:
All the customized parameters should return to the initial value. And all the internal memory will be deleted.
If the same file number "001" already exists in the CF card, the former file will be overwritten.

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The recorded data did not remain.

At the W range, the data will be saved by pressing the SAVE key each time.
However, when you finish the measurement, if you set the function switch to the OFF position directly from the W range, the file will remain open and the data will not be saved. Be sure to set the function key to any ranges other than the OFF range from the W range in order to close the file.

When you manually stop recording at the Wh or DEMAND range, the saving symbol "FILE" appears in the LCD display.
If the function switch is set to OFF position during the "FILE" appears in the display, the measured data will be recorded.
Be sure that the "FILE" symbol is off from the display, then change the switch to the OFF position.

The recorded data in the internal memory will be deleted when the system reset (Setting 23) is used.

Be sure to set the function switch at the OFF position before you insert or remove a CF card from the unit. If the CF card is inserted or removed with the switch being set at the ranges other than the OFF range, it is possible that the data recorded in the CF card is damaged.

If the AC power supply is interrupted and the batteries are not incorporated, the data under measurement will be lost.
In the case of using batteries, in case the batteries exhaust, the 6300 automatically save the measured data. Therefore, it is recommended to install the batteries in the 6300 even if using AC power supply.

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"Err.004" appears on the LCD when power is ON.

The internal battery may be exhausted.
Please make contact with Kyoritsu or your local Kyoritsu distributor.

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Even if trying several times to set the clock at the current time, it becomes incorrect.

The internal battery may be exhausted.
Please make contact with Kyoritsu or your local Kyoritsu distributor.

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The measurements are in a big error.

Please check that you set the right clamp sensor type at the SET UP range (Setting 04). It should be same as the clamp sensors which you use for measurement.
This SET UP range (item No.04) is to set the type of clamp sensors you will use but not to set the current range.

For example: (M-8124:1000A, M-8125:500A, M-8126:200A, M-8127:100A, M-8128:50A)

Be sure to use the same type of sensor when you use more than one sensor. It is possible to connect maximum 3 clamp sensors at one measurement, however, it is possible to use one type of clamp sensor.

Be sure that the test leads are connected correctly to the voltage input terminals. At the single-phase 3-wire and three-phase 3-wire measurement, connect the test leads at VN (blue), V1(red), V2(green) at the voltage input terminals. Connect the lead at V3(black) terminal only at the three-phase 4 wire measurement.

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Current can be measured but voltage cannot be measured ("--- V" indication)

It is possible that the frequency of the measuring voltage is not within 40 - 70Hz.

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"0A" is indicated in the display when measuring the current.

At the current range (Setting:03), "0A" will be indicated when the value is less than 1% against the selected range. When the current range 100A is selected, and if the value is less than 1A, "0A" will be indicated in the display.
At the CT ratio (Setting:06), if the CT ratio is set to more than "1", the "0A" will be displayed for the 1% x CT ratio or less against the current range.

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Although without regenerative electric power, the active power (W) indicates minus value.

Please check if you clamp the sensor in reverse direction. Clamp the sensor so that the arrow symbol on the clamp sensor points the load side.

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The reactive power (Var) or Power factor (PF) measurement indicates minus.

The minus indication on Reactive power and Power factor means the phase lead (the phase of the current moves forward against the voltage.)
Without minus indication means the phase lag.

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Neutral current (An) is not displayed.

Neutral current will be displayed in the case that the wiring is set to three-phase 4-wire (3P4W) at the Setting:01.

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When starting to measure the integration power, the recording starts after the previous measured data.

If you do not want to remain the integration value recorded previously, please press the ESC key at least 2 seconds or reset the previous data as per Setting:12.
Reset of integration value (Setting:12) is not to delete the internal memory or the previous data which is recorded in the CF card.

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How to check the instantaneous value while measuring/recording the integration value.

In order to check the instantaneous value of the voltage, current, power factor and etc while measuring/recording at Wh range, it is possible to check the value by changing the switch to the W range. It will not affect the data under recording even if the range is changed to the W range.

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Is it possible to measure only the voltage?

It is possible to measure the voltage only connecting the voltage sensor but not connecting any clamp sensors.
On the other hand, it is also possible to measure only the current by connecting the clamp sensors but not connecting the voltage sensor

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Recording does not stop at the stop time and date which are set.

It is possible that you pressed the START/STOP key for 2 seconds or more when you start recording.
When the START/STOP key is pressed 2 seconds or more, the mode will be manual operation. Therefore, the setting of stop time and date will be cancelled. If set the start time and date to automatically start, press the START/STOP key once less than 2 seconds.
In case the recording even does not stop at the stop time and date which is set, please make contact with Kyoritsu or with your local Kyoritsu distributor.

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What are the measuring ranges for each clamp sensor?

Please see here for the display ranges and the accuracy ranges for each clamp sensor.

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CSV file data cannot be read with "KEW POWER PLUS 2", "PQA MASTER".

Haven't you first opened the file with Excel and closed the file you saved it with Excel? This action modifies the file making it not readable with the PQA MASTER software. Please do not open and save the files generated by 6300, 6310 with Excel. Or if you want to use Excel please use a copy of the file, maintaining the original file in order to be able to use it with the "KEW POWER PLUS 2", "PQA MASTER".

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