Amprobe ACD-21SW User manual

Users Manual
ACD-20SW
ACD-21SW
ACD-21SWC
Digital Clamp Meter
For detailed specifications and ordering info go to www.TestEquipmentDepot.com

ACD-20SW
ACD-21SW
ACD-21SWC
Digital Clamp Meter
Users Manual
September 2009, Rev.2
©2009 Amprobe Test Tools.
All rights reserved. Printed in Taiwan
English

Limited Warranty and Limitation of Liability
Your Amprobe product will be free from defects in material and workmanship for 1 year from the date of
purchase. This warranty does not cover fuses, disposable batteries or damage from accident, neglect, misuse,
alteration, contamination, or abnormal conditions of operation or handling. Resellers are not authorized
to extend any other warranty on Amprobe’s behalf. To obtain service during the warranty period, return
the product with proof of purchase to an authorized Amprobe Test Tools Service Center or to an Amprobe
dealer or distributor. See Repair Section for details. THIS WARRANTY IS YOUR ONLY REMEDY. ALL OTHER
WARRANTIES - WHETHER EXPRESS, IMPLIED OR STAUTORY - INCLUDING IMPLIED WARRANTIES OF FITNESS
FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, ARE HEREBY DISCLAIMED. MANUFACTURER SHALL
NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES,
ARISING FROM ANY CAUSE OR THEORY. Since some states or countries do not allow the exclusion or
limitation of an implied warranty or of incidental or consequential damages, this limitation of liability may
not apply to you.
Repair
All test tools returned for warranty or non-warranty repair or for calibration should be accompanied by the
following: your name, company’s name, address, telephone number, and proof of purchase. Additionally,
please include a brief description of the problem or the service requested and include the test leads with
the meter. Non-warranty repair or replacement charges should be remitted in the form of a check, a money
order, credit card with expiration date, or a purchase order made payable to Amprobe® Test Tools.
In-Warranty Repairs and Replacement – All Countries
Please read the warranty statement and check your battery before requesting repair. During the
warranty period any defective test tool can be returned to your Amprobe® Test Tools distributor
for an exchange for the same or like product.
Non-Warranty Repairs and Replacement – US and Canada
Non-warranty repairs in the United States and Canada should be sent to a Amprobe® Test Tools
Service Center. Call Amprobe® Test Tools or inquire at your point of purchase for current repair and
replacement rates.

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ACD-21SWC
ACD-20SW
1. Current Jaws
2. Jaw Opening Lever
3. NCV LED indicator
4. Function Selector Knob
5. Range push button selector
6. LCD Display 3 ¾ digit with 3999
counts
7. Common (Ground reference) Input
jack for all functions EXCEPT
clamp-on ACA current function
8. Input jack for all functions EXCEPT
clamp-on ACA current function
9. NCV Push button function
10. NCV Sensor
11. Hand/Finger Barrier to indicate
the limits of safe access of the
meter during measurement
12. Hold Push button function
13. Ohm/Continuity push button
function
14. Input jacks for temperature
measurement
15. Temperature Slide Knob

1
CONTENTS
SYMBOLS............................................................................................................2
Safety Information.........................................................................................2
UNPACKING AND INSPECTION ..........................................................................4
INTRODUCTION ..................................................................................................4
OPERATION.........................................................................................................5
HOLD Button..................................................................................................5
RANGE Button................................................................................................5
Measuring DC Voltage...................................................................................5
Measuring AC Voltage...................................................................................5
AC Current Measurement .............................................................................5
Capacitance Measurement (ACD-21SW / ACD-21SWC only).......................6
Resistance.......................................................................................................6
Continuity Testing..........................................................................................6
Diode Testing (ACD-20SW)............................................................................7
Temperature Measurement (ACD-21SW / ACD-21SWC only).....................7
Non-Contact Voltage Indicator.....................................................................7
Auto Power off ..............................................................................................8
Cancellation of Auto Power off feature: .....................................................8
SPECIFICATIONS .................................................................................................8
DC Volts ..........................................................................................................9
AC Volts ..........................................................................................................9
AC Current......................................................................................................9
Resistance.......................................................................................................9
Capacitance (ACD-21SW / ACD-21SWC only) ............................................10
Temperature (ACD-21SW / ACD-21SWC only)...........................................10
Continuity.....................................................................................................10
(NCV) Non-Contact Voltage Indicator ........................................................10
Diode Test (ACD-20SW only).......................................................................11
Battery Replacement ...................................................................................11
MAINTENACE AND REPAIR..............................................................................11

2
SYMBOLS
Battery WRefer to the manual
TDouble Insulated JEarth Ground
BAlternating Current IFuse
FDirect Current PComplies with EU directives
,
Application around and
removal from hazardous live
conductors is permitted
;Conform to relevant
Australian standards
=Do not dispose of this product
as unsorted municipal waste mAudible tone
)Canadian Standards Association (NRTL/C)
Safety Information
• The ACD-20SW, ACD-21SW and ACD-21SWC swivel Clamp meters conform
to EN61010-1:2001; EN61010- 2-032:2002; CAT III 600 V, class II; pollution
deg.2 and EN61326-1 (EMC compliance)
• This instrument is EN61010-1 certied for Installation Category III (600V).
It is recommended for use in primary supply lines, overhead lines and
cable systems and distribution level and xed installations, as well as lesser
installations.
• Do not exceed the maximum overload limits per function (see
specications) nor the limits marked on the instrument itself. Never apply
more than 600 V ac rms between the test lead and earth ground.
WWarnings and Precautions
• Before and after hazardous voltage measurements, test the voltage
function on a known source such as line voltage to determine proper
meter functioning.
• Disconnect the test leads from the test points before changing meter
functions.
• Disconnected from the meter’s test leads before measuring current.

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• Inspect the Clamp meter, test leads and accessories before every use. Do
not use any damaged part.
• Never ground yourself when taking measurements. Do not touch exposed
circuit elements or test probe tips.
• Do not operate the instrument in an explosive atmosphere.
• To reduce the risk of re or electric shock, do not expose this product to
rain or moisture.
• The meter is intended only for indoor use. To avoid electrical shock hazard,
observe the proper safety precautions when working with voltages above
60 VDC, 42.4 Vpk, or 30 VAC rms. These voltage levels pose a potential
shock hazard to the user.
• Before and after hazardous voltage measurements, test the voltage
function on a known source such as line voltage to determine proper
meter functioning.
• Keep your hands/ngers behind the hand/nger barriers (of the meter and
the test leads) that indicate the limits of safe access of the hand-held part
during measurement.
• Inspect test leads, connectors, and probes for damaged insulation or
exposed metal before using the instrument. If any defects are found,
replace them immediately.
• This Clamp-on meter is designed to apply around or remove from un-
insulated hazardous live conductors. Individual protective equipment must
be used if hazardous live parts of the installation could be accessible.
• Exercise extreme caution when: measuring voltage >20 V // current >10
mA // AC power line with inductive loads // AC power line during electrical
storms // current, when the fuse blows in a circuit with open circuit voltage
>600 V // servicing CRT equipment.
• Remove test leads before opening the case to change the battery.
• Disconnect circuit power and discharge all high-voltage capacitors before
testing resistance, continuity, diodes, or capacitance.
• To avoid false readings, which could lead to possible electric shock or
personal injury, replace the batteries as soon as the low battery indicator
( ) appears.
• To avoid electric shock hazard, do not use the HOLD mode to determine if
a circuit is live. Unstable readings will not be captured and displayed.
WCAUTION
For non-invasive ACA current measurements, clamp the jaws around only
one single conductor of a circuit for load current measurement. More than 1
conductor will cause false readings

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UNPACKING AND INSPECTION
Your shipping carton should include:
1 ACD-20SW, ACD-21SW or ACD-21SWC Swivel Clamp Meter
1 Set of Test leads
1 Soft Carrying Case
1 Users Manual
1 Type K Thermocouple probe (Model ACD-21SW / ACD-21SWC only)
2 1.5V AAA Batteries (Installed)
If any of the items are damaged or missing, return the complete package to the
place of purchase for an exchange.
INTRODUCTION
The ACD-20SW, ACD-21SW and ACD-21SWC clamp-On meters come with a new
patented rotating head design that allows easy viewing of the measurements in
tight or inconvenient to reach places. Simply rotate the body of the meter to get
an unobstructed view of the LCD display. Rich set of features and CAT III 600V
safety reading for use in electrical and HVAC applications.
The features include:
•180 degree rotating head for the perfect display viewing
•Advanced VoltTect non-contact voltage detection
•Slim jaw design with one hand operation
•Measures AC Current up to 400 ACA, AC/DC Voltage up to 600V,
•Resistance and Capacitance(ACD-21SW / ACD-21SWC only)
•Temperature measurement (ACD-21SW / ACD-21SWC only)
•Audible continuity
•Auto and manual ranging respectively for quick checks and precise
measurements
•Auto power off
•Data hold
•Diode Test (ACD-20SW only)
•Accommodates conductors up to 1.18” (30mm) in diameter

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OPERATION
HOLD Button
Data hold freezes the reading present on the LCD at the moment the button is
pressed.To use this menu feature, set up the meter for the type of measurement
and range desired.
Connect the test leads to the circuit / component to be measured and then press
“HOLD” push button. The LCD reading will freeze and display “HOLD.” You may
now remove the test leads and the reading will not change until you press Hold
again.
RANGE Button
This function allows the user to select the range of a function that does not show
‘RANGE’ on the LCD.
Measuring DC Voltage
1. Set the Function Switch to L
2. Connect the test leads: Red to +, Black to COM.
3. Connect the test probes to the circuit test points. Refer to Fig.1
4. Read the display. If necessary, correct any overload ( 0L) conditions.
Measuring AC Voltage
1. Set the Function Switch to K.
2. Connect the test leads: Red to +, Black to COM.
3. Connect the test probes to the circuit test points. Refer to Fig.2
4. Read the voltage on the primary display and the frequency on the
secondary display. If necessary, correct any overload (0L) conditions.
AC Current Measurement
1. Set the Function Switch to position ?.
2. Open spring-loaded clamp by pressing the jaw opening lever on the left
side of meter.
3. Position clamp around one wire or conductor. Release the jaw opening
lever. Wire should be center inside the jaws. Refer to Fig.3
4. Read the current on the primary display and the frequency on the
secondary display. If necessary, correct any overload (OL) conditions.

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Capacitance Measurement (ACD-21SW / ACD-21SWC only)
When testing a capacitor that is part of a circuit, if “dS.C” is displayed on the
screen, a voltage is present. Discharge the capacitor before testing.
1. Sett the Function Switch to “ E” position.
2. Connect the test leads: Red to +, Black to COM.
3. Connect the test probes to the circuit test points. Refer to Fig. 4
4. Read the display. If necessary, correct any overload (0L) conditions.
WCAUTION
Using the Resistance or Continuity function in a live circuit will produce false
results and may damage the instrument. In most cases the suspected component
must be disconnected from the circuit to obtain an accurate reading.
Resistance
1. Set the Function Switch to e. Use the “e/R“ button to select the
resistance test (ACD-21SW / ACD-21SWC only).
2. Connect the test leads: Red to +, Black to COM.
3. Turn off power to the circuit being measured. Never measure resistance
across a voltage source or on a powered circuit.
4. Discharge any capacitors that may influence the reading.
5. Connect the test probes across the resistance. Refer to Fig.5
6. Read the display. If 0L appears on the highest Range, the resistance is too
large to be measured or the circuit is an open circuit.
Continuity Testing
1. Set the Function Switch to e. Use the “e/R“ button to select the test
(ACD-21SW / ACD-21SWC only).
2. Connect the test leads: Red to +, Black to COM.
3. Turn off power to the circuit being measured.
4. Discharge any capacitors that may influence the reading.
5. Connect the test probes across the resistance or the two points of test
6. Listen for the tone that indicates continuity (< 25e).