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2

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AUTO RANGING

600A AC

CLAMP METER/

AUTO RANGING

AC/DC TRUE

RMS 400A

CLAMP METER

USER’S MANUAL

DAMP60/DAMP68

Please read this manual carefully and thoroughly before using this product.

DAMP60_68_MANUAL_FINAL_F-111511_awb 11/15/11 3:24 PM Page 1

INT ODUCTION

Thank you for purchasing General Tools &

Instruments’ (General’s) DAMP60 or DAMP68

Auto Ranging Clamp Meter. Please read this

user’s manual carefully and thoroughly before

using the instrument.

Each meter combines the functions of a voltmeter

and a clamp-type ammeter. Both are designed for

use in an industrial setting.

The DAMP60 is designed to be used by VAC/R

contractors, building maintenance technicians

and electricians.

The DAMP68—with more features (see table

below)—is designed for precise measurement

and analysis of AC/DC power circuits by

process/power plant operators, VAC/R

contractors and electrical technicians.

The DAMP60 and DAMP68 are easy to use,

ruggedly built and designed for safety. Both

instruments are ETL certified for CAT III 600V use.

3

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3

Key Features . . . . . . . . . . . . . . . . . . . . . 4 –5

What's in the Blister ack . . . . . . . . . . . . . 5

roduct Overview . . . . . . . . . . . . . . . . . 5 –7

Safety Instructions . . . . . . . . . . . . . . . 8 – 11

Setup Instructions . . . . . . . . . . . . . . . . . . . 11

Install Batteries . . . . . . . . . . . . . . . . . . . 11

Operating Instructions . . . . . . . . . . . 11 – 17

Measuring AC or DC Current . . . . . 11 – 12

Measuring DC Voltage . . . . . . . . . . . . . . 13

Measuring AC Voltage . . . . . . . . . . . . . . 14

Measuring Resistance . . . . . . . . . . 14 – 15

Checking the Integrity of a Diode

. . 15 – 16

Checking for Continuity . . . . . . . . . . . . . 16

Measuring Temperature

(DAM 68 only) . . . . . . . . . . . . . . . . . . . . 16

Measuring Capacitance

(DAM 68 only) . . . . . . . . . . . . . . . . . . . . 17

Measuring Frequency . . . . . . . . . . . . . . 17

owering Off . . . . . . . . . . . . . . . . . . . . . . 17

Specifications . . . . . . . . . . . . . . . . . . 18 – 21

Warranty Information . . . . . . . . . . . . . . . . 22

Return for Repair olicy . . . . . . . . . . . . . . 23

Manuel de L’Utilisateur . . . . . . . . . . . 25 – 47

2

KEY FEATURES & SPECS COMPARISON

Feature or Specification DAMP68 DAMP60

Parameters Measured AC/DC voltage, AC/DC voltage, AC current,

AC/DC current, resistance, resistance, frequency

frequency, capacitance,

temperature

AC Current Range 0 to 400A 0 to 600A

DC Current Range 0 to 400A /A

True RMS Voltage & Yes o

Current Readings

Resistance Range 0 to 40MΩ 0 to 20MΩ

Frequency Range 0 to 9.999MHz 10 to 1999Hz

Capacitance Range 0 to 4000␮F /A

Temperature Range -40° to 752°F /A

(-40° to 400°C)

Clamp Jaw Type Hall effect Coil-type

Opening 1.2 in. (31mm) 1.1 in. (28mm)

Display Maximum Count 4000 2000

Analog Bar Graph Yes o

Ranging Options Auto or manual Autoranging only

Zero Offset Yes o

Memory o Maximum value

Power Source Three “AAA” batteries Two “AAA” batteries

DAMP60_68_MANUAL_FINAL_F-111511_awb 11/15/11 3:24 PM Page 2

• Auto ranging or manual ranging

• Ergonomic design with rugged rubber housing

• Data hold, zero offset buttons

• all effect clamp jaw

WHAT’S IN THE

BLISTE PACK

The DAMP60 and DAMP68 each come in a blister

pack along with a black soft pouch with a belt

loop.

The pouch for the DAMP60 contains a pair of red

and black test leads, (2) “AAA” batteries and this

user’s manual.

The pouch for the DAMP68 contains a pair of red

and black test leads, a “K” type thermocouple

probe, (3) “AAA” batteries and this user’s

manual.

P ODUCT OVE VIEW

Fig. 1 shows the labels and positions of the

controls and connectors on the front of the

DAMP60 and DAMP68. Fig. 2 shows all possible

display indications on both units. Familiarize

yourself with the functions and meanings of these

controls, indicators and connectors before

moving on to the Setup Instructions.

5

KEY FEATU ES

DAMP60 AUTO RANGING 600A AC

CLAMP METER

• 7 functions, 20 ranges

• CAT III 600V ETL certified

• Measures AC and DC voltage, AC current,

resistance and frequency

• andles up to 600A AC

• Verifies integrity of diodes and checks circuits

for continuity

• Jumbo 3-1/2 digit (2000 count) backlit LCD

• Ergonomic design with rugged rubber housing

• Max memory, data hold buttons

• Auto power off

• Coil-type clamp jaw

DAMP68 AUTO RANGING AC/DC

TRUE RMS 400A CLAMP METER

• 11 functions, 34 ranges

• CAT III 600V ETL certified

• Computes and displays True RMS values

• Measures AC/DC voltage, AC/DC current,

resistance, capacitance and frequency

• andles up to 400A AC or DC

• Also measures temperature with included “K”

type thermocouple

• Verifies integrity of diodes and checks circuits

for continuity

• Jumbo 3-3/4 digit (4000 count) backlit LCD

+ analog bar graph

4

DAMP60_68_MANUAL_FINAL_F-111511_awb 11/15/11 3:24 PM Page 4

3) °F or °C temperature unit (DAMP68 only);

4) AC or DC current measurement mode

(DAMP68 only)

7.

HOLD

button (DAMP60);

RANGE

button

(DAMP68). On DAMP60, pressing this button

briefly holds/releases displayed measurement.

On DAMP68, pressing this button briefly

switches the meter from auto ranging mode

(default) to manual ranging mode. To return to

auto ranging mode, press and hold the

RANGE

button for 2+ seconds.

8. Clamp jaw release

9. Test lead sockets

DAMP60

DAMP68

76

1. 3-1/2 digit LCD

(DAMP60); 3-3/4 digit

LCD + analog bar

graph (DAMP68)

2. Clamp jaw

3. Function switch

4. Backlight button

(DAMP60);

Backlight/

HOLD

button

(DAMP68). On both

models, pressing and

holding this button for

2+ seconds turns

display backlight on

for 10 seconds. On

DAMP68, pressing

this button briefly

holds/releases

displayed

measurement.

5.

MAX

button (DAMP60); 

ZERO

button

(DAMP68). On DAMP60, pressing this button

displays maximum value of displayed

parameter over time. On DAMP68, pressing

this button “zeroes out” the display (subtracts

the offset) before measuring DC current. In

auto ranging mode, pressing the 

ZERO

button again displays the offset value.

6.

SHIFT

button (DAMP60 and DAMP68).

Press to select:

1) resistance measurement, diode check or

continuity check mode (DAMP60);

2) resistance measurement, diode check,

continuity check or capacitance measurement

mode (DAMP68);

3

2

5

7

9

4

1

6

8

Fig. 1. The controls,

indicators and

connectors of the

DAM 60 and DAM 68

Fig. 2. All possible display indications on the

DAM 60 (top) and DAM 68 (bottom)

DAMP60_68_MANUAL_FINAL_F-111511_awb 11/15/11 3:24 PM Page 6

• Use caution when working with voltages above

42V ACrms, or 60V DC. These voltages pose a

shock hazard.

• Use the proper terminals, function, and range

for all measurements.

• 

WARNING

Do not operate the meter around

explosive gas, vapor, or dust.

• 

WARNING

When using the probes, keep your

fingers behind the finger guards. Do not touch

the metal probes of the test leads when making

a measurement.

• When making connections, connect the

black (–) test lead before connecting the

red (+) test lead; when disconnecting,

disconnect the red (+) test lead before

disconnecting the black (–) test lead.

• Disconnect circuit power and discharge all

high-voltage capacitors before

measuring/testing resistance, continuity,

diodes, or capacitance.

• For all DC functions in both auto and manual

ranging mode, to avoid the risk of shock due to

possible improper reading verify the presence

of any AC voltages by first using the AC

function. Then select a DC voltage range equal

to or greater than the AC range.

• Before measuring current, turn off power to

the circuit before connecting the meter.

• Do not operate the meter with the case

(or part of the case) removed.

98

SAFETY INST UCTIONS



WA NINg

To avoid possible electric shock or personal

injury, and to avoid damaging the meter or the

equipment under test:

• Do not use the meter in any way not detailed in

this manual or the meter's safety features may

be compromised.

• Before using the meter, inspect the case.

Do not use the meter if it is damaged. Look for

cracks or missing plastic. Pay particular

attention to the insulation around the

connectors.

• 

WARNING

Inspect the test leads for damaged

insulation or exposed metal. Check the test

leads for continuity. Replace damaged test

leads before using the meter.

• Verify the meter’s operation by measuring a

known voltage. Do not use the meter if it

operates abnormally. Protection may be

impaired. When in doubt, have the meter

serviced.

• 

WARNING

Do not apply more than the rated

voltage, as marked on the meter, between the

terminals or between any terminal and ground.

• 

WARNING

Do not measure voltages above

600V in Category III installations.

• 

WARNING

Do not measure voltage when the

function switch points to the resistance (ohms),

current, capacitance or temperature settings.

Never measure current when the switch points

to the resistance (ohms), capacitance or

temperature settings.

DAMP60_68_MANUAL_FINAL_F-111511_awb 11/15/11 3:24 PM Page 8

Symbol Description Symbol Description

Application and For measurements

removal from made on building

hazardous live equipment such

conductors as distribution

permitted panels, feeders

and short branch

circuits, and on

lighting systems in

large buildings.

SETUP INST UCTIONS

INSTALL BATTERIES

The battery compartment of the DAMP60 and

DAMP68 is located at the back of the meter.

To open the compartment, use a small Phillips-

head screwdriver to remove the single screw

securing the battery compartment cover. Be

careful not to lose the small screw. Put the screw

and the cover to the side.

Install the supplied “AA” batteries (two in the

case of the DAMP60; three for the DAMP68) in

the battery compartment. Use the polarity marks

stenciled inside the compartment as a guide.

Replace the battery compartment cover and

secure it with the Phillips-head screw.

OPE ATINg INST UCTIONS

MEASURING AC OR DC CURRENT

 Warning

Before making current measurements, make

certain that all test leads are disconnected from

the meter terminals.

(1) Set the function switch to the (DAMP60)

or (DAMP68) position. For DAMP68,

AC current measurement is the default mode;

11

• Use only two “AAA” batteries (DAMP60), or

three “AAA” batteries (DAMP68), properly

installed in the battery compartment, to power

the meter. Do not use rechargeable batteries.

• Replace the batteries as soon as the low

battery indicator “ ” appears. Operated with

weak batteries, the meter might produce false

readings that could lead to electric shock and

personal injury.

• Remove the test leads from the meter before

opening the meter case or battery

compartment.

Electric l Symbols Used On the

Meter nd In This M nu l

Symbol Description Symbol Description

AC (Alternating Fuse

Current)

DC Double

(Direct Current) Insulated

Caution, risk of Risk of danger.

electric shock. Important

azardous information.

voltage. Refer to the

manual.

Battery

(Low battery) Earth ground

when shown

on display

Diode Continuity

Beeper

AC or DC Complies with

EU directives

10

DAMP60_68_MANUAL_FINAL_F-111511_awb 11/15/11 3:24 PM Page 10

MEASURING DC VOLTAGE

 Warning

Do not measure voltage higher than 600V. Doing

so may damage the meter’s internal circuitry. If

the voltage is over 1000 VDC, the beeper will

sound continuously, indicating an over-range

measurement.

(1) Set the function switch to the position.

(2) Plug the black and red test leads into the

– and + input terminals, respectively.

(3) Touch the black test lead to the lower-

potential point of the circuit under test, and

the red test lead to the higher-potential point.

(4) Read the measured voltage on the display. If

the test leads are reversed, a minus sign will

appear to the left of the displayed value.

13

press the

SHIFT

button to select DC current

measurement. Before measuring DC current,

press the 

ZERO

button to clear (offset) the

last reading from the display.

(2) Squeezing the clamp jaw release to open the

jaw, place it around the conductor whose

current you wish to measure. Be sure to

enclose only one conductor (see figure below).

Enclosing both conductors of a pair will

produce a reading of

0

.

Note:

General’s ACL10 line splitter makes it possible

to safely attach the DAMP60 or DAMP68 to

a line cord carrying up to 15A AC without

separating its conductors, thereby damaging

the cord. For more information or to order, visit

www.generaltools.com and enter “ACL10” in

the SEARC box.

(3) Read the measured value from the display. In

the case of the DAMP68, the displayed value

is a True RMS reading.

Notes:

Clamp the jaw around one

conductor only.

Close the jaw completely.

Center the wire in the jaw

for highest accuracy.

12

RED TEST LEAD

BLACK TEST LEAD

RED TEST LEAD

BLACK TEST LEAD

DAMP60_68_MANUAL_FINAL_F-111511_awb 11/15/11 3:24 PM Page 12

(2) Plug the black and red test leads into the

– and + input terminals, respectively.

(3) Measure the resistance by touching the

probes to the desired test points of the circuit.

(4) Read the measured resistance on the display.

If the resistance value is over range,

OL

will

appear on the display.

CHECKING THE INTEGRITY

OF A DIODE

(1) Turn the function switch to the (DAMP60)

or (DAMP68) position. Press the

SHIFT

button to select the diode check function.

(2) Plug the black and red test leads into the

– and + input terminals, respectively.

(3) Connect the red test lead to the anode

(positive terminal) of the diode to be tested,

and the black test lead to its cathode

(negative terminal).

(4) Read the forward bias voltage value on the

display.

(5) If the polarity of the test leads is reversed,

OL

will appear on the display. This can be used to

distinguish the anode and cathode of a diode.

(6) A silicon diode typically has a forward bias

voltage of 0.7V. A germanium diode typically

has a forward bias voltage of 0.3V. A

0V

reading in both directions indicates a shorted

15

MEASURING AC VOLTAGE

 Warning

Do not measure voltages higher than 600V AC or

internal damage will occur. If the applied voltage

is over 750V AC, the beeper will sound

continuously, indicating an over-range

measurement.

(1) Set the function switch to the position.

(2) Plug the black and red test leads into the

– and + input terminals, respectively.

(3) Measure the voltage by touching the probes to

the desired points of the circuit. With AC

voltage, the polarity of the test leads is not a

factor.

(4) Read the measured voltage on the display.

MEASURING RESISTANCE

 Warning

To avoid electrical shock or damage to the meter

when measuring resistance or continuity in a

circuit, make sure the power to the circuit is

turned off and all capacitors are discharged.

(1) Turn the function switch to the (DAMP60)

or (DAMP68) position. Make sure power is

disconnected from the circuit to be measured.

Resistance measurement is the default

function for this function switch position on

both the DAMP60 and DAMP68.

14

RED TEST LEAD

BLACK TEST LEAD

RED TEST LEAD BLACK TEST LEAD

RED TEST LEAD BLACK TEST LEAD

DAMP60_68_MANUAL_FINAL_F-111511_awb 11/15/11 3:24 PM Page 14

MEASURING CAPACITANCE

(DAMP68 ONLY)

 Warning

To avoid possible damage to the meter or other

equipment, turn off the power source and

discharge all high-voltage capacitors.

(1) Disconnect the capacitor from power.

(2) Short the capacitor’s terminals to discharge it.

(3) Disconnect any resistors between the

terminals of the capacitor.

(4) Set the rotary switch to the position.

Press the

SHIFT

button to select capacitance

measurement mode.

(5) Plug the black and red test leads into the

– and + input terminals, respectively.

(6) Connect the test leads to the terminals of the

capacitor.

(7) Read the measured capacitance value on the

display.

MEASURING FREQUENCY

(1) Turn the function switch to the

Hz

position.

(2) Plug the black and red test leads into the

– and + input terminals, respectively.

(3) Measure the frequency by touching the red

probe to any point of a circuit, and the black

probe to circuit ground.

(4) Read the measured frequency on the display.

POWERING OFF

When you have finished using the meter, rotate

the function switch to the

OFF

position.

The meter enters Sleep mode and the display

goes blank if no buttons are pushed and no input

is received for 15 minutes. Press any button to

wake the meter up.

17

diode. An

OL

reading indicates an open diode.

In either case, the diode is defective and

should be replaced.

CHECKING FOR CONTINUITY

(1) Turn the function switch to the (DAMP60)

or (DAMP68) position. Press the

SHIFT

button to select continuity checking mode.

(2) Plug the black and red test leads into the

– and + input terminals, respectively.

(3) Touch the test leads to any two points of a

circuit. If the resistance between those points

is ⭐30⍀, the beeper will sound continuously.

MEASURING TEMPERATURE

(DAMP68 ONLY)

 Warning

To avoid possible damage to the meter or

other equipment, remember that the included

“K” Type thermocouple is rated -40° to 752°F

(-40° to 400°C).

When the meter is not connected to the included

thermocouple,

OL

will be shown on the display.

(1) Turn the function switch to the

°C/°F

position.

°C

is the default setting. Press the S IFT

button to select

°F

.

(2) Plug the included “K” type thermocouple into

the meter's – and + terminals, making sure to

insert the pin marked + into the + terminal.

(3) Read the measured temperature on the

display.

16

DAMP60_68_MANUAL_FINAL_F-111511_awb 11/15/11 3:24 PM Page 16

19

SPECIFICATIONS

arameter or Specification DAM 60 DAM 68

Feature/Function

AC voltage Measurement ranges 0 to 1.999V/ 19.99V/ 0 to 400mV/ 4V/

199.9V/ 600V 40V/ 400V/ 600V

Measurement accuracy ±(1.0% + 5 digits) ±(1% + 5 digits);

±(2% + 10 digits)

for 400mV range only

DC voltage Measurement ranges 0 to 199.9mV/1.999V/ 0 to 400mV/ 4V/ 40V/

19.99V/199.9V/600V 400V/600V

Measurement accuracy ±(0.8% + 5 digits) ±(0.8% + 5 digits)

AC current Measurement range(s) 0 to 199.9A/600A 0 to 400A

Measurement accuracy ±(3% + 5 digits) ±(3% + 5 digits)

DC current Measurement range N/A 0 to 400A

Measurement accuracy N/A ±(3% + 5 digits)

Resistance Measurement ranges 0 to 199.9Ω/ 1.999kΩ/ 0 to 400Ω/4kΩ/40kΩ/

19.99kΩ/199.9kΩ/ 400kΩ/

1.999MΩ/19.99MΩ4MΩ/40MΩ

Measurement accuracy ±(1% + 5 digits)@<1MΩ; ±(1% + 5 digits)@<1MΩ;

±(2% + 5 digits)@≥1MΩ±(2% + 5 digits)@≥1MΩ

Frequency Measurement range(s) 10 to 1999 z for 0 to 99.99 z/999.9 z/

inputs from 0.2V to 30Vrms

9.999k z/99.99k z/999.9k z/

9.999M z for inputs

from 2V to 600Vrms

Measurement accuracy ±(3% + 10 digits) ±2%

Capacitance Measurement ranges N/A 0 to 40nF/400nF/4

␮

F/

40

␮

F/ 400

␮

F/4000

␮

F

Measurement accuracy N/A ±(4% + 5 digits)

Continuity Threshold ≤ 30Ω≤ 30Ω

Diode integrity Open circuit voltage 1.5V 2.7V

18

DAMP60_68_MANUAL_FINAL_F-111511_awb 11/15/11 3:24 PM Page 18