GW Instek GCM-407 Manual de usuario

GCM-407 User Manual

I. Overview - - - - - - - - - - - - - - - - - - - - - - - - - - 1

II. Open-case Inspection - - - - - - - - - - - - - - - - - 1

III. Safety Operation Guidelines - - - - - - - - - - - - 2

IV. Electrical Symbols - - - - - - - - - - - - - - - - - - - 4

V. External Construction - - - - - - - - - - - - - - - - - 5

VI. Display Symbols - - - - - - - - - - - - - - - - - - - - 6

VII. Key Functions - - - - - - - - - - - - - - - - - - - - - 7

VIII. Technical Indicators - - - - - - - - - - - - - - - - - 8

1. General Specifications - - - - - - - - - - - - - - - 8

2. Environmental Restraints - - - - - - - - - - - - - 9

3. Electrical Specifications - - - - - - - - - - - - - 10

IX. Measurement Operating Instructions- - - - - 13

1. AC Current Measurement - - - - - - - - - - - - 13

2. AC voltage Measurement - - - - - - - - - - - - 15

3. DC voltage Measurement - - - - - - - - - - - - 17

4. Resistance Measurement - - - - - - - - - - - - 18

5. Continuity Test- - - - - - - - - - - - - - - - - - - - 19

6. Diode Measurement- - - - - - - - - - - - - - - - 21

7. Capacitance Measurement - - - - - - - - - - - 22

8. Non-contact AC Voltage Sensing NCV- - - 24

9. Power- - - - - - - - - - - - - - - - - - - - - - - - - - 25

10. Automatic Shutdown Function - - - - - - - - 25

X. Maintenance and Upkeep - - - - - - - - - - - - - 25

1. General Maintenance- - - - - - - - - - - - - - - 25

2. Installation or Replacement of the Batteries 25

GCM-407 User Manual GCM-407 User Manual

I. Overview

GCM-407 is a portable, true 6000 count, auto range

clamp ammeter with a simulation bar. Featuring a

large scale integrated circuit, Σ/∆ analog-digital

converter, full-function on-screen display, full-range

overload protection and a unique design has given

this specific clamp ammeter superior performance.

The clamp ammeter is applicable to the following

measurements: AC/DC voltage, AC current,

resistance, diode, continuity, capacitance,

data-hold, maximum/minimum value measurement,

relative value measurement, flashlight function,

VFC function, NCV function, under-voltage display

and an automatic shutdown function.

The instruction manual includes relevant safety

information and warning indicators. Please read

them carefully and strictly observe all warnings and

notes.

Warning:

Prior to using the clamp meter, please read the

relevant "Safety operation guidelines" carefully.

II. Open-case Inspection

Unpack and take out the instrument. Carefully

check that the following accessories are not

damaged or missing.

1.An operating instruction manual

2.Test leads

3.Carrying case

If anything is missing or damaged, please contact

your GW Instek distributor. If the instrument is not

used in an appropriate manner the safety protec-

tions could be impaired. The unit can be used for

MAINS measurements up to CATII 1000V or CATIII

600V according to IEC 61010-031.

III. Safety Operation Guidelines

Please note the “warning signs” and notes.

Warnings indicate a condition or action that may

cause a threat to the user or may damage the

instrument or the equipment under test.

This meter complies with EN61010-1, 61010-2-032,

61010-2-033, Pollution Degree 2, Overvoltage

Category (CATII 1000V, CATIII 600V) and double

insulation standards.

Conforms to UL STD 61010-1 and IEC STD

61010-2-032

Certified to CSA STD C22.2 No.61010-1 and

61010-2-032.

This product has been tested to the requirements

of CAN/CSA-C22.2 No. 61010-1, second edition,

including Amendment 1.

CAT II: Applicable to test and measurement circuits

connected directly to utilization points (socket

outlets and similar points) of the low-voltage MAINS

installation.

CAT III: Applicable to the test and measurement

circuits connected to the distribution part of the

building’s low-voltage MAINS installation.

1. Check the clamp ammeter and test leads before

use. Refrain from using the clamp if the clamp is

damaged in anyway.

1 2

8. When the LCD display shows the icon, “ ”, it

indicates that the battery should be replaced to

ensure the measurement accuracy. Take out the

battery from the clamp meter when the meter

has not been used for a long time.

9. Refrain from altering the internal wiring of the

clamp meter to prevent damage to the meter or

harm to the operator.

10.Refrain from storing or using the clamp meter in

the environments with explosive elements,

flammables, high temperatures, high humidity or

strong electromagnetic fields.

11.Clean the clamp meter case with a soft cloth and

neutral detergents. Do not use abrasive

materials or solvents to prevent corroding the

case, damage to the instrument and to prevent

danger to the operator.

GCM-407 User Manual GCM-407 User Manual

IV. Electrical Symbols

This symbol signifies the product complies with

both USA and Canadian requirements

Complies with EU standards

Danger! High voltage!

AC or DC (Alternating current or direct current)

Diode

Buzzer on-off

DC (Direct current)

AC (Alternating current)

Warning prompt

Ground

Dual insulation

Capacitance

Do not use the clamp meter if the test lead

insulation is damaged, if the case insulation is

damaged, if the LCD is not functioning or if the

clamp meter is not functioning properly.

2. Do not use the clamp meter if the rear cover or

battery cover is not in place. Failure to do so

may cause electric shock.

3. Keep fingers behind the finger guard. Do not

touch any bare wires, conductors, unused input

terminals, or circuits that are being measured

when the clamp meter is in operation.

4. Make sure the function switch is in the correct

position prior to measurement. Do not change

ranges when using the clamp meter to prevent

damaging the meter.

5. Refrain from applying more than DC1000V/

AC750V to the clamp meter to prevent electric

shock to the user and damage to the clamp

meter.

6. Be careful when measuring RMS voltages

greater than 30DCV or 30ACV as electric shock

can occur.

7. Do not measure voltages or current higher than

the allowable input values. Set the function

range switch to the highest range possible if the

magnitude of the measured value is not known.

Before measuring resistors, diodes or continuity

in a circuit, the circuit should be powered down

and all capacitors in the circuit should be

completely discharged or the measurement

results could be inaccurate.

GCM-407 User Manual GCM-407 User Manual

Open/Short or Continuity prompt

V. External Construction (See Figure

1. Clamp head: A device used to measure AC

current and convert current into voltage.

2. Clamp body: Designed to safely protect the

operator from touching dangerous areas.

3. Trigger. Press the trigger to open the clamp

head. When the trigger is released the clamp head

closes.

4. Function dial: Selects the measurement function

or range.

5. Function keys: HOLD, MAX/MIN, REL.

6. LCD display area: Displays the measured data

and the function icons.

7. Input Terminals: Input terminals for measure-

ments other than AC current measurement.

VI. LCD Display (See Figure 2)

Max./Min measurement prompt

GCM-407 User Manual GCM-407 User Manual

VII. Key Functions

1. SELECT

Tap the SELECT key to select measurement

modes.

2. HOLD

Press the HOLD key to enter the data hold

measurement mode. Press the key again to exit

this mode.

Long-press the HOLD key to turn the backlight

on. If the HOLD key is long-pressed again within

15 seconds, the backlight will be turned back off.

The backlight will automatically turn off after 15

seconds.

3. MAX/MIN

Pressing the MAX/MIN key will toggle the

measurement between the maximum and

minimum measurement mode. “MAX” or “MIN”

will be displayed on the LCD when in the

maximum or minimum measurement mode. This

measurement mode is applicable for AC voltage,

AC current and resistance measurements.

Long-press the MAX/MIN key to exit from

maximum/minimum measurement.

4. REL

Pressing the REL key enters the relative

measurement mode. In the relative measure-

ment mode the main display will show the

measured value minus the reference value. The

reference value is obtained from the current

measurement when the REL key is pressed. This

function is only applicable for AC voltage, AC

current, resistance and capacitance measure-

ment. Press the REL key again to exit the

relative measurement mode. The LCD will

display “∆” when in this mode.

5. FLASHLIGHT

Long-press this key to turn the flashlight function

on.

Press the this key to turn the flashlight function

off.

VIII Technical Indicators

1. General Specifications

Liquid crystal display: Displays 6000 counts

maximum.

Polarity display: Automatic positive and negative

polarity display.

Overload display: “OL”, “-OL”.

Low voltage display: “Figure 2” indicates that the

battery voltage is lower than the working voltage,

indicating that the battery should be replaced.

Sampling rate: Approximately 3 samples/sec.

Sensor type: Coil induction.

GCM-407 User Manual GCM-407 User Manual

Test Position Error:

An additional reading error of ±1.0% may occur

when the measured wired is not clamped into the

center of the clamp head.

Impact Resistance Strength:

1m fall impact.

Maximum Clamp Head Diameter:

30mm

Maximum Diameter of Conductor Allowed:

30mm

Electromagnetic Field Impact:

Using this meter near electromagnetic fields may

result in an unstable display or inaccurate readings.

Power:

3 AAA 1.5V zinc manganese batteries.

Dimensions:

228mmx77mmx41mm;

Weight:

About 265g (inclusive of the battery).

2. Environment Constraints:

Working environment: Indoor

Altitude: 2000m

Safety codes: IEC61010-1; IEC61010-2-032;

CAT II 1000V, CAT III 600V;

Pollution grade: 2;

Operating humidity and temperature: 0ºC ~ 30ºC

(not greater than 80%RH), 30ºC ~ 40ºC (not

greater than 75%RH), 40ºC ~ 50ºC (not greater

than 45%RH).

Storage humidity and temperature: -20ºC ~ 60ºC

(not greater than 80% RH).

3. Electrical Specifications

Accuracy: ±(% of reading + digits)

Calibration interval: 1 year.

Ambient temperature: 23ºC±5ºC.

Ambient humidity: ≤80% RH

Temperature coefficient: 0.1x(accuracy)/ºC

1. AC Current ( )

Display: True RMS AC current: applicable for

ranges from 10% to 100%.

Frequency response: 50Hz ~ 60Hz;

The measurement accuracy of non-sinusoidal

current waveforms should be 5% higher.

2. AC Voltage ( )

6. Diode Test ( )

7. Capacitance ( )

Display: True RMS AC voltage; applicable for

ranges from 10% to 100%.

Voltage: Input impedance ≥ 10MΩ;

Frequency response: 40~400Hz

3. DC Voltage ( )

Input impedance ≥10MΩ

4. Resistance ( Ω )

5. Continuity Test ( )

GCM-407 User Manual GCM-407 User Manual

Open-circuit

voltage is

approx. 3.3V,

measurable PN

forward bias ≤

3V. Silicon PN

typical forward

bias is approx.

0.5~0.8V.

11 12

8. NCV

IX. Measurement Operation Instructions

1. AC Current Measurement (see Figure 3)

1) Set the switch to AC current mode and press the

trigger to open the clamp head. Position the

conductor in the clamp head and slowly release

the trigger until the clamp head is completely

closed. Be sure the conductor is clamped to the

center of the clamp head, otherwise additional

errors may be introducted. Only one current

conductor should be measured at a time.

Measuring two or more current conductors may

result in erroneous measurement readings.

2) Read the AC value directly from the display.

Note:

• Be sure the conductor to be measured is

clamped at the center of the clamp head, if not,

an additional reading error of ±1.0% may result.

GCM-407 User Manual GCM-407 User Manual

13 14

• The true RMS AC current meaurement accuracy

is based on sinusoidual waveforms. For

non-sinusoidal waveforms, adjust the accuracy

as follows:

Crest factor 1.4 ~ 2.0: additional ±1.0%

Crest factor 2.0 ~ 2.5: additional ±2.5%

Crest factor 2.5 ~ 3.0: additional ±4.0%

2. AC Voltage Measurement (see Figure 4)

1) Insert the red test lead in the “V” input jack and

the black test lead in the “COM” input jack.

2) Rotate the function dial to the AC voltage

measurement function and connect the test leads in

parallel to the load to be measured.

3) Read the AC voltage from the display.

Note:

• Do not input voltages greater than AC 750V.

Higher voltages may damage the meter.

• Be aware that higher voltages can cause electric

shock.

• After all measurement operations are completed,

disconnect the test leads from the EUT.

• When the measured voltage is greater than the

safety voltage of 30VAC, the LCD will display a

high voltage warning prompt, “ ”. When

voltages greater than the AC 750V range are

input, the meter warning prompt, “ ”, will flash

and the meter will automatically buzz intermit-

tently.

GCM-407 User Manual GCM-407 User Manual

15 16

• The true RMS AC voltage meaurement accuracy

is based on sinusoidual waveforms. For

non-sinusoidal waveforms, adjust the accuracy

as follows:

Crest factor 1.4 ~ 2.0: additional ±1.0%

Crest factor 2.0 ~ 2.5: additional ±2.5%

Crest factor 2.5 ~ 3.0: additional ±4.0%

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