Draper DCM402 Instruction Booklet

400 SERIES

CLAMP METER

41967

IMPORTANT: Please read these instructions carefully to ensure the safe and effective use of this product and save
these instructions for future reference. This manual has been compiled by Draper Tools and is an integrated part of the
product with which it is enclosed and should be kept with it for future references.

This manual describes the purpose for which the product has been designed and contains all the necessary information
to ensure its correct and safe use. We recommend that this manual is read before any operation or, before performing
any kind of adjustment to the product and prior to any maintenance tasks. By following all the general safety
instructions contained in this manual, it will ensure both product and operator safety, together with longer life of the
product itself.

AlI photographs and drawings in this manual are supplied by Draper Tools to help illustrate the operation of the product.
Whilst every effort has been made to ensure accuracy of information contained in this manual, the Draper Tools policy

of continuous improvement determines the right to make modifications without prior warning.

1. TITLE PAGE

1.1 INTRODUCTION:

USER MANUAL FOR:

SERIES 400 CLAMP METER

Stock no. 41967.
Part no. DCM402.

1.2 REVISIONS:

Date first published July 2017

As our user manuals are continually updated, users should make sure that they use the
very latest version.

Downloads are available from: http://www.drapertools.com/manuals

DRAPER TOOLS LIMITED WEBSITE: drapertools.com
HURSLEY ROAD PRODUCT HELPLINE: [phone]
CHANDLER’S FORD GENERAL FAX: [phone]
EASTLEIGH
HAMPSHIRE
SO53 1YF
UK

1.3 UNDERSTANDING THIS MANUALS SAFETY CONTENT:

WARNING! Information that draws attention to the risk of injury or death.
CAUTION! Information that draws attention to the risk of damage to the product or

surroundings.

1.4 COPYRIGHT © NOTICE:

Copyright © Draper Tools Limited.
Permission is granted to reproduce this publication for personal & educational use only.
Commercial copying, redistribution, hiring or lending is prohibited.
No part of this publication may be stored in a retrieval system or transmitted in any other
form or means without written permission from Draper Tools Limited.

In all cases this copyright notice must remain intact.

2

2. CONTENTS

2.1 CONTENTS
Page content

1 TITLE PAGE

1.1 INTRODUCTION ........................................................................................................ 2

1.2 REVISION HISTORY ..................................................................................................2

1.3 UNDERSTANDING THIS MANUAL ...........................................................................2

1.4 COPYRIGHT NOTICE ................................................................................................2

2 CONTENTS

2.1 CONTENTS................................................................................................................. 3

3 GUARANTEE

3.1 GUARANTEE.............................................................................................................. 4

4 INTRODUCTION

4.1 GENERAL SPECIFICATIONS ....................................................................................5

4.2 TECHNICAL SPECIFICATIONS............................................................................. 5-9

5 HEALTH & SAFETY INFORMATION

5.1 SAFETY PRECAUTIONS .........................................................................................10

6 IDENTIFICATION

6.1 LCD ...........................................................................................................................12

7 UNPACKING & CHECKING

7.1 PACKAGING............................................................................................................. 13

7.2 WHAT’S IN THE BOX ...............................................................................................13

8 OPERATION INSTRUCTIONS

8.1 DATA HOLD..............................................................................................................14

8.2 SWITCHING FREQUENCY OR DUTY .....................................................................14

8.3 PEAK MEASUREMENT............................................................................................14

8.4 SWITCHING FUNCTIONS........................................................................................14

8.5 RELATIVE/INRUSH MEASUREMENT .....................................................................14

8.6 BACKLIGHT AND CLAMP HEAD LIGHTING ...........................................................15

8.7 AUTOMATIC SHUTDOWN FUNCTION....................................................................15

8.8 BUZZER....................................................................................................................15

8.9 PREPARATION FOR MEASUREMENT ...................................................................15

8.10

8.11 AC VOLTAGE MEASUREMENT ..............................................................................16

8.12 DC VOLTAGE MEASUREMENT ..............................................................................16

8.13 FREQUENCY MEASUREMENT CLAMP FREQUENCY MEASUREMENT.............16

8.14 VOLTAGE MEASUREMENT ....................................................................................17

8.15 FREQUENCY MEASUREMENT BY HZ/DUTY.........................................................17

8.16 DUTY CYCLE MEASUREMENT...............................................................................18

8.17 VOLTAGE MEASURED DUTY CYCLE ....................................................................18

8.18 MEASURE THE DUTY CYCLE IN HZ/DUTY............................................................19

8.19 RESISTANCE MEASUREMENT ..............................................................................19

8.20 DIODE TEST.............................................................................................................20

8.21 CONTINUITY TEST ..................................................................................................20

8.22 MEASURING TEMPERATURE ................................................................................20

8.23 MEASURING INRUSH CURRENT ...........................................................................20

9 MAINTENANCE

9.1 REPLACEMENT BATTERY......................................................................................21

10 EXPLANATION OF SYMBOLS

10.1 EXPLANATION OF SYMBOLS.................................................................................22

11 DISPOSAL

11.1 DISPOSAL ...............................................................................................................23

DECLARATION OF CONFORMITY......................................................................................ENCLOSED

.............................................................................. Page

AC AND DC CURRENT MEASUREMENT USING CURRENT CLAMP HEAD

....................15

3

3. GUARANTEE

3.1 GUARANTEE

Draper tools have been carefully tested and inspected before shipment and are guaranteed to
be free from defective materials and workmanship.
Should the tool develop a fault, please return the complete tool to your nearest distributor
or contact Draper Tools Limited, Chandler's Ford, Eastleigh, Hampshire, SO53 1YF.
England.
Telephone Sales Desk: [phone] or Product Helpline [phone].
A proof of purchase must be provided with the tool.
If upon inspection it is found that the fault occurring is due to defective materials or
workmanship, repairs will be carried out free of charge. This guarantee period covering
parts/labour is 12 months from the date of purchase except where tools are hired out when
the guarantee period is 90 days from the date of purchase. This guarantee does not apply
to normal wear and tear, nor does it cover any damage caused by misuse, careless or
unsafe handling, alterations, accidents, or repairs attempted or made by any personnel
other than the authorised Draper warranty repair agent.
Note: If the tool is found not to be within the terms of warranty, repairs and carriage
charges will be quoted and made accordingly.
This guarantee applies in lieu of any other guarantee expressed or implied and variations
of its terms are not authorised.
Your Draper guarantee is not effective unless you can produce upon request a dated
receipt or invoice to verify your proof of purchase within the guarantee period.
Please note that this guarantee is an additional benefit and does not affect your statutory
rights.
Draper Tools Limited.

4

4. INTRODUCTION

The Meter shall be designated for one year and recalibrated at 18°C to 28°C and a relative
humidity of less than 75%.

4.1 GENERAL SPECIFICATIONS

Auto-ranging/Manual ranging.
Full-scale overload protection
The maximum allowable voltage between the measuring end and the earth:

1000V DC or 750V AC
Display: LCD
Maximum display value: 5999 digits
Polarity indication: Automatic indication, '-' indicates negative polarity.
Over range display: '0L' or '-0L'.
Sampling time: about 3 times / sec
Unit display: with function, power unit display.
Automatic shutdown time: approx. 15 minutes after no signal
Power supply: DC power supply 4.5V
Battery type: 1.5V AAA battery
Battery under voltage indication: display symbol on LCD.
Temperature coefficient: less than 0.1 × accuracy / ℃
Working temperature: 18℃ ~ 28℃
Storage temperature: -10℃ ~ 50℃
Size: 208 × 78 × 35mm
Jaw opening maximum size: approx. 36mm
Clamp can measure the maximum diameter: approx. 26mm
Weight: approx. 240g (including battery)

4.2 TECHNICAL SPECIFICATIONS

Measuring range & accuracy
(Accuracy guaranteed at 23ºC ± 5ºC, humidity <75%)

Note: When measuring Sine waves with the true RMS method the meter may display a
reading between 1-50A. This is normal and does not affect the accuracy of the meter.

5

4. INTRODUCTION

AC Current

Range Accuracy Resolution

60A ±(2.5% rdg + 8 digits) 0.01A

600A 0.1A

Max. input current: 600A AC.
Frequency range: 50Hz.

DC Current

Range Accuracy Resolution

60A ±(2.0% rdg + 8 digits) 0.01A

600A 0.1A

Max. input current: 600A AC.

INRUSH Current

Range Accuracy Resolution

60A ±(5.0% rdg + 60 digits) 0.01A

600A 1A

Inrush measurement time: 100ms.
Amperage range: 20 ~ 600A.
Frequency range: 40 ~ 400Hz.

DC Voltage

Range Accuracy Resolution
600mV 0.1mV

6V ±(0.8% rdg + 5 digits) 0.001V

60V 0.01V

600V ±(1.0% rdg + 5 digits) 0.1V

Input impedance: 10MΩ.
Max. input voltage: 600V AC (RMS) or 600V DC.
Frequency range: 40 ~ 1000Hz.

Note:
In the low voltage range, with the test leads is not connected to the circuit under test, the
Meter may have a fluctuating reading, this is normal, this it is caused by high sensitivity of
the Meter, it does not affect the actual measurement results.

6

4. INTRODUCTION

AC Voltage

Range Accuracy Resolution

6V ±(1.0% rdg + 5 digits) 0.001V

60V 0.01V

600V ±(1.2% rdg + 5 digits) 0.1V

Input impedance: 10MΩ.
Max. input voltage: 600V AC (RMS) or 600V DC.
Frequency range: 40 ~ 1000Hz.

Note:
In the low voltage range, with the test leads is not connected to the circuit under test, the
Meter may have a fluctuating reading, this is normal, this it is caused by high sensitivity of
the Meter, it does not affect the actual measurement results.

Frequency
By V range

Range Accuracy Resolution

99.99Hz ±(1.5% rdg + 5 digits) 0.01Hz

999.9Hz 0.1Hz

9.999kHz 0.001kHz
Range: 10Hz ~ 10kHz

Input voltage range: ≥ 2V AC (RMS) (Higher frequencies require a larger input voltage)
Input impedance: 10MΩ
Maximum/ input voltage:：600V AC (RMS)

By HZ/DUTY range:

Range Accuracy Resolution

9.999Hz 0.001Hz

99.99Hz ±(3.0% rdg + 5 digits) 0.01Hz

999.9Hz 0.1Hz

9.999kHz 0.001kHz

99.99kHz 0.01kHz

999.9kHz 0.1kHz

9.999MHz 0.001MHz
Overload protection：250V DC or AC（RMS)

BY A range (Clamp Jaws):

Frequency response：10 ~ 1 kHz
Input current range：≥20A AC (RMS)
Max. input current：AC 1000A
Input voltage range：≥ 2V (Higher frequencies require a larger input voltage)

7

4. INTRODUCTION

Duty cycle

Range Accuracy Resolution
 0.1 – 99.9% ±(3.0% rdg + 3 digits) 0.1%

BY A range (Clamp Jaws):

Frequency response：10 ~ 1 kHz
Input current range：≥20A AC (RMS)
Max. input current：AC 1000A

By V range:

Frequency response：10 ~ 10 kHz
Input voltage range：≥ 2V AC
Input impedance：10MΩ
Maximum/ input voltage：750V AC (RMS)

By HZ/DUTY range:

Frequency response：10 ~ 10MHz
Input voltage range：≥ 2V AC（RMS）(Higher frequencies require a larger input voltage)
Maximum/ input voltage：250V AC（RMS）

Resistance

Range Accuracy Resolution
600Ω 0.1Ω
6kΩ ±(0.8% rdg + 3 digits) 0.001kΩ
60kΩ 0.01kΩ
600kΩ 0.1kΩ
6MΩ ±(1.2% rdg + 3 digits) 0.001MΩ
60MΩ ±(2.0% rdg + 5 digits) 0.1MΩ

Open circuit voltage: about 0.4V
Overload protection:：250V DC or AC（RMS）

Continuity Test

Range Resolution Function

0.1Ω

Overload protection: 250V DC or AC RMS.

8

If the measured circuit resistance is less than 50Ω, the

built-in buzzer inside the Meter may sound. Less than

10Ω will be pronounced

4. INTRODUCTION

Capacitance

Range Accuracy Resolution

9.999nF 0.001nF

99.99nF ±(3.0% rdg + 5 digits) 0.01nF

999.9nF 0.1nF

9.999μF 0.001μF

99.99μF 0.01μF

999.9μF 0.1μF

9.999mF ±(5.0% rdg + 5 digits) 0.001mF

99.99mF Not calibrated 0.01mF

Overload protection：250V DC or AC（RMS)

Diode Test

Range Resolution Function

0.001V

Forward DC current ~ 1mA
Reversed DC voltage ~ 3.0V
Overload protection: 250V DC or rms AC

Displaying approximate forward voltage of diode.

Temperature Measurement

Range Accuracy Resolution
−50℃−300℃ ±(1.0% + 4d) 1℃
301℃−1000℃ ±(1.9% + 5d) 1℃

-58℉−600℉ ±(1.2% + 6d) 1℉
601℉−1832℉ ±(1.9% + 6d) 1℉

9

5. HEALTH & SAFETY INFORMATION

Warning

To avoid electrical shock or personal injury.

Please read the safety information and “warnings and precautions” before use.

This is an AC-DC current digital clamp meter (hereinafter referred to as the clamp meter).
The whole circuit design is based on LSI A / D converter with full-scale overload protection
circuit and frequency measurement function.

The Clamp Meter can be used to measure the AC and DC voltage, AC and DC current,
resistance, capacitance, frequency, duty cycle, diodes and temp.

5.1 SAFETY PRECAUTIONS

The instrument strictly follows the GB4793 electronic measuring instrument safety
requirements IEC61010-1 and IEC1010-2-032 safety standards for the design and
production, in line with double insulation, over-voltage CAT III 600V and pollution level 2
safety standards.

Safe working habits

To avoid possible electric shock or personal injury, and to avoid damage to the instrument

or the object to be measured, use the meter in the following ways:

• Inspect the instrument. Do not use the instrument if the case is damaged. Check for

cracks or missing plastic parts. Pay particular attention to the insulating layer of the

connector.

• Inspect the test leads for insulation damage or bare metal. Check the continuity of the

test leads. If the test leads are damaged, replace them before using the instrument.

• Use the instrument to measure a known voltage to make sure the instrument operates

normally. Do not use if the instrument is working abnormally. Protection facilities may

have been damaged. If in doubt, the instrument should be sent for maintenance.

• Do not apply any voltage beyond the rated voltage indicated on the meter between any

terminal and earth ground.

• Warning: When working above 30V use caution not to touch exposed contacts due to

risk of electric shock. Only use the approved probes or clamps.

• Measurements must be made with the correct jack, function and range.

• Do not use the instrument near explosive gases, vapours or dust.

• When using the test leads, keep your fingers behind the test lead protector.

• When connecting, first connect the common test lead, and then connect the live test

lead. When disconnect, the live test lead and then disconnect the common test lead.

• Before you test the resistance, continuity and diodes, you must first cut off the power,

and discharge all the capacitors.

• If the meter is not used in accordance with the instructions, the safety protection

provided by the instrument may be impaired or invalidated.

• Ensure the instrument is switched off when opening the battery cover.

• When the battery under voltage indicator “ ” lights up, immediately replace the

battery. When the battery power is low, the meter may produce incorrect readings,

resulting in electric shock and personal injury. DO NOT mix new and old batteries and

do not use re-chargeable batteries.

• Before opening the battery cover, the test leads must be removed from the instrument.

• Please use a soft cloth to clean instrument case, do not use abrasives or solvents.

10

6. IDENTIFICATION




















 Measurement clamp head.
 Inspection light.
 Protection Guard: Protects the user's

hand from touching the danger zone.

 Clamp trigger.
 Measuring function selection dial.

 “SEL” function Button.
 Function buttons.
 Display.
 Probe sockets.
 Current direction marking.

11

6. IDENTIFICATION

6.1 LCD (Liquid-crystal display) - FIG. 1



 













FIG.1

 Inrush Current Measurement.
 Direct Current.
 Alternating Current.
 Diode Check.
 Continuity checking indicator.
 PEAK HOLD measuring status.
 Battery low indicator.
 Diode measurement indicator.
 Measure capacity indicator.

    





 Degrees Celsius, Degrees

Fahrenheit.

 Auto range indicator.
 Relative mode.
 Negative polarity indicator.
 Data hold indicator.
 Automatic shutdown indicator.
 Linear Bar graph indicator.

12

7. UNPACKING & CHECKING

7.1 PACKAGING

Carefully remove the product from the packaging and examine it for any sign of damage
caused during shipping. Lay the contents out and check them. If any part is damaged or
missing, do not attempt to use the tool and contact the Draper Helpline immediately (see
back page for details).

Retain the packaging material at least during the guarantee period: in case the machine
needs to be returned for repair.

Warning! Some of the packaging materials used may be harmful to children, keep them out
of reach from children.

Disposed of any packaging correctly and according to local regulations.

7.2 WHAT´S IN THE BOX?

As well as the product; there are several parts not fitted or attached to it.



 Test probe.
 Temperature probe.





 Test probe caps.

13

8. OPERATING INSTRUCTIONS

8.1 DATA HOLD

During the measurement, press the ‘HOLD’ function button, the data will be held on the
display and a ‘H’ symbol will appear. Press the ‘HOLD’ function button to return to normal
measurement mode.

8.2 SWITCHING FREQUENCY OR DUTY

1. During the voltage or current ranges, press the “Hz/Hz/ %”button to switch between,

frequency of the voltage or current. Press the “Hz/Hz/ %”button twice, the Meter will
change to duty range for measuring the duty cycle of the voltage or current.

2. Press “Hz/Hz/ %”button again, the Meter will change back to voltage or current
measuring.

8.3 PEAK MEASUREMENT

1. Press the "PEAK HOLD" key to enter the manual range mode, display the Peak Max

value; then press this key twice to display the Peak Min value; then press to display
the difference between Peak Max-Peak Min. Press "PEAK HOLD" key for more than 2
seconds to exit this mode.

2. After entering the Peak Max mode, the maximum value of the measurement is
automatically saved.

3. After entering the Peak Min mode, the minimum value of the measurement is
automatically saved.

4. After entering the Peak Max-Peak Min mode, the measured difference is automatically
saved

5. Press "PEAK HOLD" key for more than 2 seconds to exit this mode, the Meter will
return to normal measurement state.

8.4 SWITCHING FUNCTIONS

1. In the resistance range, press the "SEL" key, to switch between resistance, diode,
continuity, capacitance ranges.

2. In the voltage range, press the "SEL" key, to switch between the DC and AC.

3. In the temperature range, press the "SEL" key, to switch between degrees Celsius and
Fahrenheit.

8.5 RELATIVE INRUSH MEASUREMENT

Press "REL/INRUSH" function button, the meter enters the relative value measurement
mode, and the auto range mode is switched off. If the "REL/INRUSH" button is pressed
again, the meter will return to auto range.

14

8. OPERATING INSTRUCTIONS

8.6 BACKLIGHT AND CLAMP HEAD LIGHTING

1. Press the “ ” function button for approx. 2 seconds to turn on and off the backlight.

Note: The light will turn off automatically after 60 seconds.
Note: The inspection light will only come on while in AC/DC current function.

8.7 AUTOMATIC SHUTDOWN FUNCTION

If the meter is not used for approx. 15 minutes the meter will automatically shut down. The
meter will give a warning buzz approx. 1 minute before.

8.8 BUZZER

When any key is pressed or the function switch is activated, (if the function key is valid),
the buzzer will sound; if the measured voltage or current is greater than the set value, such
as the voltage is greater than 600V and the AC / DC current is greater than 600A, the
buzzer will continue to sound as an over range warning.

8.9 PREPARATION FOR MEASUREMENT

1. Switch on the power by turning the measuring function selection dial.

If the battery voltage is lower than ≤3.9V, the “ ”symbol will appear and the batteries
should be replaced.

2. If the “ ”symbol shows that the input voltage or current should not exceed the

specified value in order to protect the internal circuit from damage.

3. Turn the measuring function selection dial to the required function and range to be

measured.

4. Connect the black lead to the com probe socket and the red lead to the VΩ probe

socket.

8.10

AC AND DC CURRENT MEASUREMENT USING CURRENT CLAMP HEAD.

Warning
Risk of electric shock. YOU MUST NOT measure current using the probes.
Remove the test leads from the meter when measuring with the clamp head.

1. Rotate the measurement function selection dial to the appropriate current.

2. Press the trigger to open the clamp, pass the wire to be measured into the centre of the

clamp, and then slowly release the trigger until the clamp is fully closed.

3. Read the measurement result from the LCD.
Note: The instrument can only measure one current conductor at a time.

If two or more current conductors are measured at the same time, the measurement will be
inaccurate.

15

8. OPERATING INSTRUCTIONS

8.11 AC VOLTAGE MEASUREMENT

Warning
Risk of electric shock.
When measuring high voltage, extra care should be taken to avoid electrical shock.
Do not attempt to use this meter on a voltage higher than the AC600V rms value.

1. Rotate the measurement function selection dial to the AC voltage measurement.

2. Connect the black lead to the COM probe socket and the red lead to the VΩ probe

socket.

3. The measured value is read from the LCD.

8.12 DC VOLTAGE MEASUREMENT

Warning
Risk of electric shock.
When measuring high voltage, extra care should be taken to avoid electrical shock.
Do not attempt to use this meter on a voltage higher than DC600V rms.

1. Rotate the measurement function selection dial to the DC voltage measurement.

2. Connect the black lead to the COM probe socket and the red lead to the VΩ probe

socket.

3. The measured value is read from the LCD. The polarity display will indicate the polarity

of the terminals to which the red test is connected.

8.13

FREQUENCY MEASUREMENT CLAMP FREQUENCY MEASUREMENT

(THROUGH THE AC CURRENT RANGE)

Warning
Risk of electric shock.
Remove the test leads from the meter when measuring with the clamp head.

1. Rotate the measurement function selection dial to the current measurement level.

2. Press the trigger to open the clamp, pass the wire to be measured into the centre of the

clamp, and then slowly release the trigger until the clamp is fully closed.

3. Press the "Hz %" button to select the frequency measurement function

4. The measurement result is read from the LCD.

Note: The instrument can measure only one current conductor at a time.
If two or more current conductors are clamped at the same time, the measurement result

may be wrong. The frequency measurement range is 10Hz ~ 1kHz. If the measurement
frequency is less than 10Hz, the LCD will display "00.0". It is possible to measure the
frequency higher than 1kHz, but the measurement may not be accurate. The maximum
input current is 600A AC (rms).

16

8. OPERATING INSTRUCTIONS

8.14 VOLTAGE MEASUREMENT

(THROUGH THE AC VOLTAGE RANGE)

Warning
Risk of electric shock
When measuring high voltage, extra care should be taken to avoid electrical shock.
Do not attempt to use this meter on a voltage higher than the AC600V rms value.

1. Rotate the measurement function selection dial to the AC voltage measurement.

2. Connect the black lead to the COM probe socket and the red lead to the VΩ probe

socket.

3. Press the "Hz %" button to select the measurement function.

4. Connect the test leads to the signal.

5. The measurement result is read from the LCD.

Note: The frequency measurement range is 10Hz ~ 10 kHz. If the measurement frequency
is lower than 10Hz, the LCD will display "00.0". It is possible to measure the frequency
higher than 10kHz, but it cannot guarantee the accuracy of the measurement.

The maximum input voltage is 600V AC (rms).

8.15 FREQUENCY MEASUREMENT BY HZ / DUTY

Warning

Risk of electric shock.
When measuring high voltage, extra care should be taken to avoid electrical shock.
Do not attempt to use this meter on a voltage higher than the AC250V rms value.

1. Rotate the measurement function selection dial to the "Hz%" position.

2. Connect the black lead to the COM probe socket and the red lead to the VΩ probe
socket.

3. Press the "Hz %" button to select the measurement function.

4. Connect the test leads to the signal .

5. The measurement result is read from the LCD.

Note: The frequency measurement range is 10Hz ~ 10MHz. If the measurement frequency
is lower than 10Hz, the LCD will display "00.0". It is possible to measure the frequency
higher than 10MHz, but it cannot guarantee the accuracy of the measurement. The
maximum input voltage is 250V AC (rms).

17

8. OPERATING INSTRUCTIONS

8.16 DUTY CYCLE MEASUREMENT

MEASURED BY AC CURRENT PROFILE DUTY CYCLE (FROM THE CLAMP HEAD)

Warning

Risk of electric shock.
Remove the test leads from the meter when measuring with the clamp head.

1. Rotate the measurement function selection dial to the current measurement.

2. Press the trigger to open the clamp, pass the wire to be measured into the centre of the
clamp, and then slowly release the trigger until the clamp is fully closed.

3. The measurement result is read from the LCD.

Note: The instrument can measure only one current conductor at a time. If two or more
current conductors are clamped at the same time, the measurement result may be wrong.

The duty cycle measurement range is 10 ~ 95%. If the measured duty cycle is less than
10%, the LCD will display "UL". If the duty ratio is higher than 94.9%, "OL" will be
displayed. The input signal frequency measurement range is 10 ~ 1kHz, if the
measurement is higher than 1kHz frequency the measurement accuracy cannot be
guaranteed. The maximum input current is 600A AC (rms).

8.17 VOLTAGE MEASURED DUTY CYCLE

(THROUGH THE AC VOLTAGE RANGE)

Warning

Risk of electric shock.
When measuring high voltage, extra care should be taken to avoid electrical shock.
Do not attempt to use this meter on a voltage higher than the AC600V rms value

1. Rotate the measurement function selection dial to the AC voltage measurement.

2. Connect the black lead to the COM probe socket and the red lead to the VΩ probe
socket.

3. Press the "Hz /%" button to select the duty cycle measurement function.

4. Connect the test leads to the signal source.

5. The measurement result is read from the LCD.

Note: The duty cycle measurement range is 10 ~ 95%. If the measured duty cycle is less
than 10%, the LCD will display "UL". If the duty ratio is higher than 94.9%, "OL" will be
displayed.

18

8. OPERATING INSTRUCTIONS

8.18 MEASURE THE DUTY CYCLE IN HZ / DUTY

Warning
Risk of electric shock.
When measuring high voltage, extra care should be taken to avoid electrical shock.
Do not attempt to use this meter on a voltage higher than the AC250V rms value

1. Rotate the measurement function selection dial to the "Hz %".

2. Connect the black lead to the COM probe socket and the red lead to the VΩ probe

socket.

3. Press the "Hz /%" button to select the duty cycle measurement function.

4. Connect the test leads to the signal source.

5. The measurement result is read from the LCD.
Note: The duty cycle measurement range is 10 to 95%. If the measured duty cycle is less

than 10%, the LCD will display "UL". If the duty ratio is higher than 99%, "OL" will be
displayed. The input signal frequency measurement range is 10 ~ 10MHz, if the
measurement frequency is higher than 10MHz the measurement accuracy is not
guaranteed. The maximum input voltage is 250V AC (rms).

8.19 RESISTANCE MEASUREMENT

Warning
Risk of electric shock.
When measuring the impedance on the line, make sure that the circuit power is off

and the capacitors on the circuit are fully discharged.

1. Rotate the measurement function selection dial to the resistance position and ensure

that the power to the circuit under test is off.

2. Press the "SEL" button to select the resistance measurement function.

3. Connect the black lead to the COM probe socket and the red lead to the VΩ probe

socket.

4. The measured resistance value is read from the LCD
Note: When there is no input (e.g. open circuit), the display will show "OL" indicating that

the measured value is out of range. If the measured resistance is greater than 1MΩ, it may
take a few seconds for the meter to stabilize the reading. This is normal for high impedance
measurements.

19

8. OPERATING INSTRUCTIONS

8.20 DIODE TEST

Warning
Risk of electric shock.
When measuring diodes on a line, make sure that the circuit power is off and the

capacitors on the circuit are fully discharged.

1. Rotate the measuring function selection dial to the Diode position and ensure that the

power to the circuit under test is cut off

2. Press the "SEL" button to select the diode measurement function

3. Connect the black lead to the COM probe socket and the red lead to the VΩ probe

socket.

4. The meter will display the value of the diode under test. If the test polarity is reversed,

the meter will display "OL" this can be used to distinguish between the anode and
cathode diodes.

Note: The instrument shows the forward voltage drop of the measured diode.

8.21 CONTINUITY TEST

Warning
Risk of electric shock.
Make sure the circuit power is off, and the circuit capacitors completely discharged.

1. Rotate the measuring function selector dial to the continuity position and ensure that

the power to the circuit under test is off.

2. Press the "SEL" button to select the continuity measurement function

3. Connect the lead to the COM input jack and red lead to the VΩ probe socket.

4. If the measured resistance of the line is less than 40Ω, the buzzer will sound.

8.22 MEASURING TEMPERATURE

WARNING
Risk of electric shock.

Do not input a voltage of over DC 30V and AC 60V voltage in the temperature
measurement range to avoid harm or damage to the instrument.

1. Rotate the function range switch to the temperature measurement range (select Celsius

or Fahrenheit as needed).

2. Connect the negative and positive terminals of the K-type thermocouple to the COM

input jack and jack.

8.23 MEASURING INRUSH CURRENT

WARNING
Risk of electric shock.

Before removing the current clamp, remove the watch from the instrument.

1. Rotate the measurement function selection dial to the appropriate current.

2. Press the trigger to open the clamp, pass the wire to be measured into the centre of the
clamp, and then slowly release the trigger until the clamp is fully closed.

3. Press the "REL / INRUSH" key for more than 2 seconds to enter the inrush current
measurement mode. The LCD displays "- - - -" until the motor is detected.

4. Read the measurement result from the LCD.

20

9. MAINTENANCE

9.1 REPLACEMENT BATTERY

Warning

To avoid false readings that may result in electric shock or personal injury, replace
the battery as soon as the“ ” symbol appears on the meter display.

To avoid electrical shock or personal injury, shut down and check to make sure that
the test lead has been disconnected from the measuring circuit before opening the
battery cover and replacing it with a new one.

Follow these steps to replace the battery:

1. Turn off the instrument.

2. Remove all test leads from the input jacks.

3. Loosen the screws that secure the battery cover with a screwdriver.

4. Remove the battery cover.

5. Disconnect and remove the old battery

6. Replace with three new AAA batteries, pay attention to the battery positive and
negative. Do not mix new with old batteries and do not use re-chargeable batteries.

7. Attach the battery cover and tighten the screws.

21

10. EXPLANATION OF SYMBOLS

10.1 EXPLANATION OF SYMBOLS

°

C

WEEE
Do not dispose of Waste Electrical
& Electronic Equipment in with
domestic rubbish.

For indoor use.
Do not expose to rain.

Class II construction
(Double insulated).

Conforms to all relevant
safety standards.

Earth.

Attention.

Temperature.

°

F

Back light.

Voltage AC.

Voltage DC.

A

Current AC.

Current DC.

A

Resistance in Ohms.

Continuity test buzzer.

Data hold / Screen lock.

Auto power off.

0 10 20 30 40

22

Warning!
Read instruction manuals before
operating and servicing this
equipment.

Diode test.

Low battery display.

Bar graph.

Inspection light
Work light.

36mm

Clamp size.

Capacitance.

Frequency.

Hz

11. DISPOSAL

NOTES

11.1 DISPOSAL

- At the end of the machine’s working life, or when it can no longer be repaired, ensure

that it is disposed of according to national regulations.

- Contact your local authority for details of collection schemes in your area.

In all circumstances:

• Do not dispose of power tools with domestic waste.

• Do not incinerate.

• Do not abandon in the environment.

• Do not dispose of WEEE*

as unsorted municipal waste.

* Waste Electrical & Electronic Equipment.

23

CONTACT US

Draper Tools Limited, Hursley Road,
Chandler's Ford, Eastleigh, Hampshire. SO53 1YF. U.K.

Helpline:
Sales Desk:

[phone]

[phone]
Internet: www.drapertools.com
E-mail: [e-mail]
General Enquiries: [phone]
Service/Warranty Repair Agent:

For aftersales servicing or warranty repairs, please contact the
Draper Tools Helpline for details of an agent in your local area.

YOUR DRAPER STOCKIST

©Published by Draper Tools Limited.

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