General CM660 User manual

RUGGED

AUTO RANGING

TRUE RMS

AC/DC CLAMP METERS

USER’S MANUAL

CM660: 0 TO 600A, MAX

CM700: 0 TO 1000A, MAX

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

TABLE OF CONTENTS

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

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 –4

What’s in the Blister Pack . . . . . . . . . . . . . . . . . . . . 4

Product Overview . . . . . . . . . . . . . . . . . . . . . . . 4 –7

Safety Instructions . . . . . . . . . . . . . . . . . . . . . 7 – 10

Setup Instructions. . . . . . . . . . . . . . . . . . . . . . . . . 10

Install Batteries . . . . . . . . . . . . . . . . . . . . . . . . . 10

Operating Instructions. . . . . . . . . . . . . . . . . . 11 – 24

General Instructions. . . . . . . . . . . . . . . . . . 11 – 14

anging Options . . . . . . . . . . . . . . . . . . . . . . 11

Holding eadings . . . . . . . . . . . . . . . . . . . . . 11

Tracking Max and Min eadings . . . . . . 11 – 12

Making elative Measurements . . . . . . . . . . 12

Disabling Auto Power Off (APO). . . . . . . 12 – 13

Using the Analog Bar Graph. . . . . . . . . . . . . . 13

Turning on the Backlight . . . . . . . . . . . . 13 – 14

Measuring AC or DC Current . . . . . . . . . . . 14 – 16

Measuring AC Inrush Current . . . . . . . . . . . . 15

Measuring Microamp Currents . . . . . . . 15 – 16

Measuring AC or DC Voltage. . . . . . . . . . . . 16 – 19

Using the Non-contact Voltage Detector 16 – 19

Measuring esistance . . . . . . . . . . . . . . . . . . . . 20

Checking for Continuity . . . . . . . . . . . . . . . 20 – 21

Checking the Integrity of a Diode. . . . . . . . . . . . 21

Measuring Capacitance . . . . . . . . . . . . . . . . . . . 22

Measuring Frequency and Duty Cycle . . . . 22 – 23

Measuring Temperature . . . . . . . . . . . . . . . 23 – 24

Specifications . . . . . . . . . . . . . . . . . . . . . . . . 24 – 27

Operating & Maintenance Tips . . . . . . . . . . . . . . . 28

Warranty Information . . . . . . . . . . . . . . . . . . . . . . 29

eturn for epair Policy . . . . . . . . . . . . . . . . . . . . 30

INTRODUCTION

Thank you for purchasing General Tools &

Instruments’ (General’s) CM660 or CM700 Rugged

Auto Ranging True RMS AC/DC 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. The meters are designed for

use in an industrial setting by HVAC/R contractors,

building maintenance technicians, MRO

(maintenance, repair and operations) personnel at

process and power plants, electricians and

electrical/electronic technicians.

The only difference between the CM660 and CM700

involves their current measurement range and

resolution. Where the CM660 has a 0 to 600A

measurement range and a maximum current resolution

of 0.01A, the CM700 has a 0 to 1000A measurement

range and a maximum resolution of 0.1A.

Both clamp meters are easy to use and ruggedly built.

Each meets the ETL CAT III 600V, CAT II 1000V safety

standard.

KEY FEATURES

• 16 functions, 49 ranges

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

capacitance, frequency and duty cycle

• Also measures temperature from -58° to 1112°

(-50° to 600°C) using included “K” type stem

thermocouple

• Uses beeper to verify integrity of diodes and check

circuits for continuity

• 0 to 200애A/2000애A AC/DC ranges for measuring

flame rod current with 0.1애A/1애A resolution using

included test leads

• Built-in Non-Contact Voltage (NCV) detector with four

sensitivity settings and audible and visual alerts

• Large backlit digital LCD with two 6000-count

readouts for simultaneous display of real-time

current or voltage on primary readout and line

frequency on secondary readout

• ast-response analog bar graph

• Bright LED work light

• Manual ranging and MIN/MAX display options

• Data HOLD and REL (zero) buttons

• INRUSH mode for measuring surge current during

motor startup

• 1.65 in. (42mm) jaw opening (largest in its class) for

conductors up to 550 MCM resists side torque

• Rugged housing can survive multiple drops onto

concrete from height of 5 ft. (1.6m)

• 20-minute Auto Power Off (APO) function can be

disabled

• ETL certified CAT III 600V, CAT II 1000V

• 3 year limited warranty

WHAT’S IN THE BLISTER ACK

The meter is supplied in a blister pack with a cavity in

the rear for a soft black nylon carrying pouch. Inside

the pouch are a set of double-insulated test leads

with screw-on alligator clips, a “K” type stem

thermocouple probe and plug adapter, 3 “AAA”

batteries and this user’s manual.

RODUCT OVERVIEW

ig. 1 shows the labels and positions of the controls,

indicators and physical structures of the CM660 and

CM700. ig. 2 shows all possible indications on the

LCD of either unit. amiliarize yourself with the

functions and meanings of these controls, indicators

and connectors before moving on to the Setup

Instructions and Operating Instructions.

Fig. 1.

The controls,

indicators and

physical structures

of the CM660

and CM700.

. Non-contact voltage (NCV) sensor

. NCV visual indicator

. LED work light

. Rotary function switch

. Multi-function buttons:

ZERO/REL

—Used to 1)

Reset DC current

measurement baseline

to 0A, 2)

Enter relative

measurement mode

, in which main readout shows

difference between real-time reading and stored

reading shown on secondary readout, 3)

Disable

meter’s Auto Power Off

function.

AUTO

FU C/I RUSH

—1)

Selects among

resistance

measurement, capacitance measurement, diode

integrity and continuity check modes with rotary

function switch in position, 2)

Switches

between AC and DC

with rotary function switch in

or position, 3)

Enters surge current

measurement mode

with rotary function in

position, 4)

Enters CV sensitivity set mode

pressed and held when powering on the meter.

MAX/MI —Pressed once, enters Max/Min mode

Meter displays maximum value recorded during

current measurement session on secondary

readout.

Pressed twice, switches to display

minimum

value recorded during current

measurement session on secondary readout.

Pressed a third time, exits Max/Min

mode.

HOLD—Pressed once

, holds measured value(s)

(freezes main and secondary readouts).

Pressed

again

, releases both readouts.

—

Pressed briefly

, enters manual ranging

mode in broadest range. Each subsequent button

press switches to next-narrowest full-scale

measurement range. Pressing button in narrowest

range returns to auto ranging mode.

Pressed and

held

for >2 seconds, activates display backlight

(and LED work light if rotary function switch is in

or position).

. Test lead jacks

. Clamp jaw release

. Clamp jaw

. Battery compartment (on back)

Fig. 2. All possible display indications

SAFETY INSTRUCTIONS



Warning



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.

• 

WAR I G

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.

• 

WAR I G

Do not apply more than the rated

voltage, as marked on the meter, between the

terminals or between any terminal and ground.

AUTO

• 

WAR I G

Do not measure voltages above 1000V

in Category III installations.

• 

WAR I G

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.

• Use caution when working with voltages above

42VACRMS, or 60VDC. These voltages pose a shock

hazard.

• Use the proper terminals, function, and range for all

measurements.

• 

WAR I G

Do not operate the meter around

explosive gas, vapor, or dust.

• 

WAR I G

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.

• or 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.

• Use only three “AAA” batteries, 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.

Electr cal Symbols Used On the

Meter and In Th s Manual

Symbol Description Symbol Description

AC (Alternating use

Current)

DC Double

(Direct Current) Insulated

Caution, risk of Risk of danger.

electric shock. Important

Hazardous information.

voltage. Refer to the

manual.

Battery

(Low battery) Earth ground

when shown

on display

Diode Continuity

Beeper

AC or DC AC/DC

Symbol Description Symbol Description

Application and or measurements

removal from made on building

hazardous live equipment such

conductors as distribution panels,

permitted feeders and short

branch circuits, and on

lighting systems in

large buildings.

SETU INSTRUCTIONS

INSTALL BATTERIES

The battery compartment of the CM660/700 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 three supplied “AAA” batteries 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.

or measurements on

circuits connected

directly to the source of

power for a given build-

ing (for example, on the

cable to the power

transformer ahead of

a building’s circuit

breakers). Very high

levels of energy avail-

able at CAT IV level

make arc flash possible.

Auto Power Off

function CAT IV

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