Draper 41911, 400 Series User Manual

400 SERIES

CLAMP METER

41911

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. 41911.
Part no. DCM401.

1.2 REVISIONS:

Date first published March 2017
Date second published June 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.........................................................................5-7

5 HEALTH & SAFETY INFORMATION

5.1 SAFETY PRECAUTIONS ................................................................................... 8

6 IDENTIFICATION

6.1 LCD................................................................................................................9-10

7 UNPACKING & CHECKING

7.1 PACKAGING..................................................................................................... 11

7.2 WHAT’S IN THE BOX ....................................................................................... 11

8 OPERATION INSTRUCTIONS

8.1 BACK LIGHT AND INSPECTION LIGHT.......................................................... 12

8.2 AUTOMATIC SHUTDOWN............................................................................... 12

8.3 HOLDING READINGS......................................................................................12

8.4 AC & DC VOLTAGE MEASUREMENTS .......................................................... 12

8.5 AC CURRENT MEASUREMENT...................................................................... 12

8.6 RESISTANCE MEASUREMENT ...................................................................... 13

8.7 CAPACITANCE MEASUREMENT.................................................................... 13

8.8 CONTINUITY MEASUREMENT ....................................................................... 13

8.9 DIODE TEST..................................................................................................... 14

8.10 FREQUENCY / DUTY CYCLE MEASUREMENTS ..........................................14

8.11 TEMPERATURE MEASUREMENTS................................................................ 14

9 MAINTENANCE

9.1 REPLACEMENT BATTERY.............................................................................. 15

10 EXPLANATION OF SYMBOLS

10.1 KEY EXPLANATIONS ......................................................................................16

10.2 EXPLANATION OF SYMBOLS......................................................................... 17

11 DISPOSAL

11.1 DISPOSAL ....................................................................................................... 18

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

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

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

4.1 GENERAL SPECIFICATIONS

Use of environmental conditions: 600V CAT.III Pollution Degree: II.
Altitude <2000m.
Working temperature and humidity: 0 ~ 40℃.
(<80% RH, <10 ℃ is not considered).
Storage temperature and humidity: -10 ~ 60℃.
(<70% RH, removing the battery).
Temperature coefficient: 0.1 Accuracy / ℃.
(<18 ℃ or> 28 ℃).
Measuring between earth terminal and the maximum allowable voltage:

600V DC or 600V AC RMS.
Sampling rate: about 3 times / sec.
Display: 3 3/4 digit LCD display.
Over-range indication: LCD will display "OL".
Low battery indication: When the battery voltage is lower than the
normal operating voltage, " " will be displayed on the LCD.
Input polarity indication: Auto shows “ —-”
Power: DC1.5V Х3 SIZE AAA.
Dimensions: 208mm × 78mm × 35mm
Weight: less than 340g (with battery)
Maximum jaw opening size: 36mm

DC Voltage

Range Accuracy Resolution
400mV 0.1mV
4V ±(0.8% rdg + 3 digit) 0.001V
40V 0.01V
400V 0.1V
600V ±(1.0% rdg + 3 digit) 1V

Input impedance: 10MΩ.
Max. input voltage: 600V DC or AC RMS.

5

4. INTRODUCTION

AC Voltage

Range Accuracy Resolution
400mV ±(1.5% rdg + 10 digit) 0.1m
4V 0.001V
40V ±(1.5% rdg + 5 digit) 0.01V
400V 0.1V
600V 1V

Input Impedance：10MΩ
Maximum Input Voltage：600V DC or AC RMS
Frequency Response：40Hz~400Hz，Sinusoidal RMS（Average Responding）
Notice：To AC Voltage 400mV need manually Range .

Resistance

Range Accuracy Resolution
400Ω 0.1Ω
4kΩ ±(1.2% rdg + 3 digit) 0.001kΩ
40kΩ 0.01kΩ
400kΩ 0.1kΩ
4MΩ 0.001MΩ
40MΩ ±(2.0% rdg + 5 digit) 0.01MΩ

Overload protection：600V DC or AC RMS.

Capacitance

Range Accuracy Resolution
5nF 0.001nF
50nF 0.01nF
500nF ±(3.0% rdg + 10 digit) 0.1nF
5uF 0.001uF
50uF 0.01uF
200uF 0.1uF

Overload protection：600V DC or AC RMS.

6

4. INTRODUCTION

Diode and Continuity Test

Function Range Resolution Accuracy
Diode 1V 0.001V

Shows the approximate forward

voltage drop of the diode.

When the built-in buzzer sounds,

the measured resistance is less

than 50Ω.

Overload protection: 600V AC or DC RMS.

Open circuit voltage: about 0.5V

Frequency/Duty

Range Accuracy Resolution
10Hz ±(0.8% rdg + 3 digit) 0.01Hz
100Hz 0.1Hz
1kHz 0.001kHz
10kHz 0.01kHz
100kHz 0.1kHz
1MHz 1kHz
10MHz 10kHz

0.1~99.9% ±(3.0% rdg + 3 digit)

Imput impedance：10MΩ.
Maximum input voltage：600V 600V DC or AC RMS.

AC Current

Range Accuracy Resolution
4A ±(3.5% Rdg + 20 digit) ≤0.5A 0.001A
±(3.0% Rdg+ 10 digit)
40A ±(3.0% Rdg+ 10 digit) ≤5A 0.01A
±(2.5% Rdg+ 10 digit)
400A ±(2.5% Rdg+ 10 digit) 0.1A
600A ±(1.5% Rdg+ 5 digit) 1A

Frequency：50Hz ~ 60Hz.

Maximuminputcurrent:Fullvalue120%,≤ 60 seconds

Temperature

Range Accuracy Resolution
 -20~1000ºC ±(3.0% rdg + 3 digit) 1ºC

Overload protection：600V DC AC RMS.

7

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.

8















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.
 Back light & work light.
 Function buttons.
 Display.
 Probe sockets.

9

6. IDENTIFICATION

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











FIG.1

 Battery low indicator.
 Automatic range indicator.
 LED indicator.
 Continuity checking indicator.
 Data hold indicator.





 

 Units of measurement indicator.
 DC signal measurement indicator.
 Negative indicator.
 AC signal indicator.
 Numerical display.



10

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.

11

8. OPERATING INSTRUCTIONS

8.1 BACK LIGHT AND INSPECTION LIGHT.

Press and hold the button to switch on and off the back light/inspection light.
Note: The inspection light will only come on while in AC current function.

8.2 AUTOMATIC SHUTDOWN.

If the meter is not used for approx. 30 minutes the meter will automatically shut down. The
meter will give a warning buzz approx. 1 minute before.

8.3 HOLDING READINGS.

Press and “hold” button to hold the reading while taking a measurement, the value will be
held on the display press the “hold” button again to return to the normal reading function.

8.4 AC & DC VOLTAGE MEASUREMENT:

Warning
Risk of electric shock.
When measuring high voltage, extra care should be taken to avoid electrical shock.
Do not measure any voltage above 600V DC or AC rms.

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

2. Press the "SEL" button to select AC or DC voltage measurement function.

Connect the black lead to the COM probe socket and the red lead to the INPUT socket.

3.

4. The measured value is read from the LCD.

8.5 AC CURRENT MEASUREMENT:

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. The measured value is read 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.

12

8. OPERATING INSTRUCTIONS

8.6 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 (Ω) position and
ensure that the power to the circuit under test is off.

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

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

4. The measured 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.

8.7 CAPACITANCE MEASUREMENT:

Warning
Risk of electric shock.
To avoid electrical shock, the capacitor should be fully discharged before measuring.

1. Rotate the measurement function selection dial to the capacitance ( ) position, and
ensure that the power is cut off to the circuit under test.

2. Press the "SEL" button to select the capacitance ( ) measurement.

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

Note: The measured value is read from the LCD.
A. When measuring large capacitance it can take a short time for a stable reading.

8.8 CONTINUITY MEASUREMENT:

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

1. Rotate the measurement function selection dial to the continuity ( ) measurement
position.

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

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

4. If the measured resistance is less than 50Ω ,the buzzer will sound.

13

8. OPERATING INSTRUCTIONS

8.9 DIODE TEST:

Warning
Risk of electric shock.
When measuring diodes in 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 diode, ( ) position, press the
"SEL" button to select the diode ( ) measurement function.

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

3. Connect the black and red pen test leads to the anode and cathode of the diode.

4. The measured value is read from the LCD. If the test leads polarity is reversed, the
meter will display "OL" This can be used to distinguish between the anode and cathode
of the diode.

8.10 FREQUECY/DUTY CYCLE MEASUREMENTS:

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 dial to the voltage or current measurement range.

2. Press the "Hz /%" key to select the frequency or duty cycle measurement function.

3. Connect the black and red pen test leads to the anode and cathode of the diode.

4. The measured value is read from the LCD.

8.11 TEMPERATURE MEASUREMENT:

1. Rotate the measurement function dial to the temperature measurement function.

2. Connect the black lead of the temperture probe to the COM probe socket and the red
lead of the temperture probe to the INPUT socket.

3. The measured value is read from the LCD.

14

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.

Follow these steps to replace the battery:

1. Turn off the meter.

2. Remove all test leads from the input jacks.

3. Loosen the screw that secures 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 screw.

15

10. EXPLANATION OF SYMBOLS

10.1 KEY EXPLANATIONS

Button Operation
"SEL" button:

Function selection key, press "SEL" button, with the rotary switch measurement

function to work in a trigger way.

"Hz /%" button:

Frequency / duty cycle selection key, in voltage or current range, press this key can

make the selection on voltage / frequency / duty cycle or current / frequency / duty
cycle measurement mode to work in a trigger way.

"RAN" button:

Automatic / manual range switch button, preset defaulted as auto range. Press this

button to switch to manual range. In the manual range, press this button that means
jump upwards one section, if the highest section jumps to the lowest section. Press and
hold this button for more than 2 seconds, that is, switch back to automatic range.
Frequency and capacitance measurement without manual range to trigger mode.

"HOLD" button:

Data Hold button, press the "HOLD" button, the reading will be locked and the "H"

symbol is displayed on the LCD screen simultaneously. Then press the "HOLD" button
to return to normal measurement mode to trigger mode.

" " Key:

Backlit keys and work lights button press " " to turn on the backlight and work lights

automatically turn off after about 15 seconds to trigger mode.

16

10. EXPLANATION OF SYMBOLS

10.2 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

Voltage AC.

Voltage DC.

A

Current AC.

Current DC.

A

Resistance in Ohms.

Continuity test buzzer.

Data hold / Screen lock.

Auto power off.

Back light.

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

Diode test.

Low battery display.

Inspection light
Work light.

36mm

Clamp size.

Capacitance.

Frequency.

Hz

17

11. DISPOSAL

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.

18

NOTES

19

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.

No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means,
electronic, mechanical photocopying, recording or otherwise without prior permission in writing from Draper Tools Ltd.