AEMC 725 Manual de usuario

Clamp-On Harmonic Probe

Model 725

USER MANUAL

AEMC

INSTRUMENTS

AEMC

INSTRUMENTS

RECORD-PAUSE MAX MIN AVG

SMOOTH THDF CFF RIPPLE AC + DC

RANGE

kHz

AV%

RMS

PEAK

34 521

0600

–

–+

TDHF K FACTOR

ODD

HOLD

Model 725

HARMONIC METER

OFF

Owner’s Record

The serial number is located inside the battery compartment of your

instrument. Please record this number and purchase date for your

records.

MODEL #725

CATALOG #2111.39

SERIAL #:_________________________________________________

PURCHASE DATE:_________________________________________

DISTRIBUTOR:___________________________________________

Table Of Contents
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Receiving Your Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Digital Display Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
General Measurements Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
AC Voltage Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
AC Current Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
DC Voltage Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DC Current Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
HARM Push Button: Harmonic Measurements . . . . . . . . . . . . . . . . . . . 28
Display Location: Primary/Secondary . . . . . . . . . . . . . . . . . . . . . . . . 28
Measuring Individual Harmonics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Displaying Odd & Even Harmonics
or Odd Harmonics Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Measuring the K Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Total Harmonic Distortion (%THD) . . . . . . . . . . . . . . . . . . . . . . . . . 30
Distortion Factor (%DF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
CF (Crest Factor) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Range Push Button: Manual Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Frequency Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Peak/Smooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Min/Max Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Recording With Time Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

K Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Transformer Harmonic Derating Factor (THDF) . . . . . . . . . . . . . . . . . 40

Battery Test & Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Auto-Off Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Repair, Maintenance & Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Clamp-On Harmonic Probe Model

Warning

These safety warnings are provided to ensure the safety of personnel

and proper operation of the instrument.

•Read this instruction manual completely before attempting to use

or service this instrument, and follow all the safety information.

•Use caution on any circuit: Potentially high voltages and currents

may be present and may pose a shock hazard.

•The instrument must not be operated beyond its specified operat-

ing range. Never exceed 1000 Arms/1500 A DC or 600 Volts.

• Safety is the responsibility of the operator.

•Never open the back of the instrument while connected to any cir-

cuit or input.

• ALWAYS make connections from the instrument to the circuit under

test.

• ALWAYS inspect the instrument and accessory leads for serviceabil-

ity prior to use, and replace defective parts immediately.

•Never use the Model 725 on electrical conductors rated above 600

Vrms.

International Electrical Symbols

This symbol signifies that the Model 725 is protected throughout by

double or reinforced insulation. Only use specified replacement

parts when servicing the meter.

This symbol signifies CAUTION! and requests that the user refer to

the user manual before using the meter.

4Clamp-On Harmonic Probe Model

ReceivingYour Shipment

Upon receiving your shipment, be sure that the contents are consistent

with the packing list. Notify your distributor of any missing items. If the

equipment appears to be damaged, file a claim immediately with the car-

rier and notify your distributor at once, giving a detailed description of

any damage.

Packaging

The Clamp-On Harmonic Meter Model 725 (Cat. #2111.39) includes four

1.5 V “AA” alkaline batteries, two 5 ft (1.5 m) leads, two test probes, two

grip probes, user manual and a hard carrying case.

Description

The Clamp-On Harmonic Probe Model 725 is a portable, battery operat-

ed power quality instrument. The Model 725 combines the simplicity and

familiarity of digital clamp-ons with today’s critical information on power

quality and harmonics.

Operation is simple and direct. Select Amps/Volts, AC or DC on the

rotary dial, connect, and measure. The push of a button gives additional

or more specific information. You can troubleshoot and measure power

quality with the ease of using a digital clamp-on, simply, safely, and eco-

nomically.

The Model 725 performs current and voltage measurements in True RMS

as well as current and voltage in DC, and provides immediate readings of

Total Harmonic Distortion (%THD), Individual Harmonic orders

through the 25th, Distortion Factor (%DF), Crest Factor (CF) and Peak

of distorted currents and complex voltages. It also gives the minimum,

maximum, maximum Peak and average measurement values so you can

record for over 24 hours with an internal clock logging record time.

Frequency (Hz) can be measured through either the current or the volt-

age at any time for the fundamental as well as the individual harmonic

orders.

Clamp-On Harmonic Probe Model

The Model 725 incorporates True RMS electronics and measurement

techniques to ensure correct and accurate readings on distorted wave-

forms. The DC functions incorporate the latest in Hall effect technology.

Use the Model 725 as a comprehensive tool for troubleshooting as well as

for daily measurements on circuits supplying traditional and today’s non-

linear loads.

The Model 725 provides:

• Smooth for a 3-second measurement running average for stable

readings

• Range selection for auto or manual ranging

• Peak AC & DC measurements (positive & negative)

• % Ripple for DC measurements

• Crest Factor for half cycle peaks

• Hold function for “locking” displayed value

• Display selection of AC or DC + AC measurements

• Transformer Harmonic Derating Factor (THDF)

• Selection of even & odd or odd individual harmonics

• Identifies proper (K-Factor) rating for transformers

• Auto-OFF shuts off the instrument after 10 minutes of non-use

• A 31-segment analog bar graph provides indications to track fast

variations

• Beeper function for verification of control, new MIN/MAX capture

• Battery voltage test indicates current battery status

• Low battery indicator indicates when battery replacement is

required

6Clamp-On Harmonic Probe Model

Beyond the absolute product ruggedness and overall design qualities —

the Model 725 is built with GE Lexan®and meets specific physical stan-

dards — the instrument features a high level of safety. The Model 725

meets or exceeds UL 1244 safety standards as well as IEC 1010-1 Category

III for 600 V ratings (UL®, CSA, VDE, GS and CE approvals pending).

The Model 725 is comfortable to hold, compact and easy to maneuver in

crowded breaker panels. Yet the hooked jaw design facilitates clamping

and accommodates two 500 MCM conductors.

The high sensitivity Model 725 allows low input levels (300 mA and 50

mV), permitting power quality measurements on low power or idling

equipment — an advantage not common to many instruments.

Specifications

ELECTRICAL SPECIFICATIONS

Reference Conditions:

Accuracies are provided under the following reference conditions: Temperature

23°C ± 3K, 45% to 75% RH; battery voltage 6 V ± 0.1 V; conductor centered in

the probe jaws; DC magnetic field: earth’s field (<40 A/m); no external AC mag-

netic field; no external electrical field; sine wave 45 to 65 Hz; signal present <30s

above 50 A. In THD and DF, the basic accuracy is provided for a square wave and

a triangular wave with 50% duty cycle at 50 or 60 Hz. Particular reference condi-

tions: In DC amperes, the AC component <0.1% of total signal, zeroed core rema-

nence and signal magnitude >5 A; in AC amperes the signal is a sine wave of mag-

nitude >5 A.

R refers to Reading and ct(s) to count(s). Counts may also be referred to as the

least significant digits (LSD).

AC CURRENT (TRMS)

Input Range:

0.3 to 1000.0 Arms

± 0.5 to ± 1500.0 A peak

Basic Accuracy:

0.3 to 59.99 A: 2% R ± 20 cts

60 to 1500 Apeak: 2% R ± 2 cts

Crest Factor: > 5 below 300 A

Frequency Range: 0.5 Hz to 5 kHz

Clamp-On Harmonic Probe Model

AC VOLTAGE (TRMS)

Input Range: 0.05 to 600 Vrms

± 0.05 to ±1500 V Peak

Basic Accuracy: 0.05 to 59.99 V: 1% R ±10 cts

60 to 1500 V peak: 1%R ±2 cts

Input Impedance: 1 MΩ

Frequency Range: 0.5 Hz to 5 kHz

DC CURRENT

Input Range: ± 0.03 to ± 1500 A DC

± 0.05 to ± 1500 A Peak

Basic Accuracy: ± 0.3 to ± 59.99 A: 2% R ± 20 cts

± 60 to ± 1500 A: 2% R ± 2 cts

DC VOLTAGE

Input Range: ± 0.05 to ±600 V

Basic Accuracy: 0.05 to 59.99 V: 1% R ±10 cts

60 to 1500 V peak: 1% R ±2 cts

Input Impedance: 1 MΩ

TOTAL HARMONIC DISTORTION (%THD)

Range: 0.2% to 1000%

Resolution: 0.1%

Basic Accuracy: 0.2% to 600% THD: 5%R ± 2cts

Frequency Range: Fundamental 40 Hz to 70 Hz

Display: Digital: %THD and True RMS (A or V)

Bar graph: True RMS (A or V)

DISTORTION FACTOR (%DF)

Range: 0.2% to 100%

Resolution: 0.1%

Minimum Input: 10 V or 10 A

Basic Accuracy: 5% R ± 2 cts

Frequency Range: Fundamental 40 Hz to 70 Hz

Display: Digital: %DF and True RMS (A or V)

Bar graph: True RMS (A or V)

8Clamp-On Harmonic Probe Model

INDIVIDUAL HARMONICS

Range: 0.2% to 300% (%THD or %DF)

Rank: Hdc (DC component), H01 to H25

Resolution: 0.1%

Accuracy: Distortion>10% and rank<H13: 5% R ±2 cts

Distortion>10% and rank>H13: 10% R ±2 cts

Distortion<10% and rank<H13: 10% R ±2 cts

Distortion<10% and rank>H13: 15% R ±2 cts

Frequency Range: Fundamental 40 Hz to 70 Hz, 25th order

Display: Digital: %THD and Individual Harmonic value (A or V)

Bar graph: True RMS (A or V)

TRANSFORMER HARMONIC DERATING FACTOR (CBEMA THDF)

Range: 0.10 to 1.00

Resolution: 0.01

Basic Accuracy: 2% R ± 2 cts

Display: Digital: THDF, Bar graph: Arms

TRANSFORMER K-FACTOR RATING

Range: 1 to 30

Resolution: 0.1

Basic Accuracy:

1 to 10: 5% R ± 2 cts

> 10: 10% R ± 2 cts

Display: Digital: %THD or K Factor, Bar graph: Arms

RIPPLE

Range: .1% to 999.9%

Resolution: 0.1%

Basic Accuracy:

2 to 99.9%: 5% R ±10 cts

100 to 999.9%: 5% R ± 2 cts

Display: Digital: % Ripple, Bar graph: DC (A or V)

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