AEMC 725 User manual

Clamp-On Harmonic Probe
Model 725
USER MANUAL
AEMC
INSTRUMENTS
®
P
AEMC
INSTRUMENTS
RECORD-PAUSE MAX MIN AVG
SMOOTH THDF CFF RIPPLE AC + DC RANGE
%
kHz
AV%
RMS
PEAK
AV
34 521
0600
AV
+
–
–+
!
TDHF K FACTOR
ODD
HOLD
Model 725
HARMONIC METER
OFF
A
~
A
V
V
~

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

3
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.

5
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

7
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)

9
Clamp-On Harmonic Probe Model
CREST FACTOR (CF)
Range: 1.00 to 10.00
Resolution: 0.01
Minimum Input: >5 V or >5 A
Accuracy (40 to 70 Hz):
1.00 to 3.50: 2% ± 2 cts
3.51 to 5.99: 5% ±2 cts
6.0 to 10.0: 10% ±2 cts
Display: Digital: CF, Bar graph: True RMS (A or V)
FREQUENCY (HZ)
Range: 0.5 Hz to 20,000 Hz
Minimum Input: 2 A or 2 V
Accuracy: 0.5 Hz to 999.9 Hz: 0.1% R ± 2 cts
1000 Hz to 9999 Hz: 0.2% R ± 2 cts
10 kHz to 20 kHz: 0.5% ± 2 cts
Display: Digital: Hz, Bar graph: DC (A or V), True RMS (A or V)
GENERAL SPECIFICATIONS
Battery: 4 x 1.5 V “AA” alkaline (NEDA 15A, IEC LR6)
Life: approx. 40 hrs continuous use
Dimensions: 10.8 x 4 x 2" (275 x 103 x 52 mm)
Weight: 1.5 lbs (670 g)
Display: Quadriplexed LCD, dual digital display (10 mm, 5 mm),
4 digits 10,000 counts, 31-segment bar graph
Temperature:
Operating: -10° to 55°C (14° to 131°F)
Storage: -40° to 70°C (-40° to 158°F)
Humidity:
Operating: 0 to 90% RH to +40°C (75% RH @ +55°C)
Storage: 0 to 95% RH

10 Clamp-On Harmonic Probe Model
Material:
Case: Gray Lexan®920A, UL 94 V2
Jaws: Red Lexan®500R, 10% fiberglass, UL 94 V0
LCD lens: Crystal Lexan®920A, UL 94 V1
Mechanical:
Envelope Protection: IEC 529: IP 40
Drop Test: IEC 1010: 1m
Vibration: IEC 68-2-6
Shocks: IEC 817
SAFETY
Protection Level:
Double insulation IEC 1010-1, 600 V Category III, Pollution degree 2.
Max. Working Voltage: 600 Vrms
Dielectric Test: 5.5 kV, 50/60 Hz, 1 minute
Overload Protection:
Voltage: 1.5 kV Peak permanent
Current: 1000 A AC (50/60 Hz) permanent
Agency Approvals:CSA, GS, VDE, CE pending
ELECTROMAGNETIC COMPATIBILITY
Electrostatic Discharge:
IEC 801-2: No influence: 4 kV class 2
Non-destructive: 15 kV class 4
RF: IEC 801-3: No influence: 3 V/m class 2
Minor influence: 10 V/m class 3
Transients: IEC 801-4: No influence: 2 kV class 4
Electric shocks: IEC 801-5: No influence: 6 kV class 3

11
Clamp-On Harmonic Probe Model
P
OFF
A
~
A
V
V
~
AEMC
INSTRUMENTS
RECORD-PAUSE MAX MIN AVG
SMOOTH THDF CFF RIPPLE AC + DC RANGE
%
kHz
AV%
RMS
PEAK
AV
3 4 521
0600
AV
+
–
–+
!
TDHF K FACTOR
ODD
HOLD
Model 725
HARMONIC METER
103.5 mm (4.07")
67 mm (2.6")
92 mm (3.6")
R 25 mm (.98")
86 mm (3.4")
275.5 mm (10.8")
51.7 mm (2.04")
40.7 mm (1.6")
27 mm (1.1")
50.7 mm (1.9")

Model 725 Controls
1. Jaw assembly:
Transformer jaws opens to 1 1/8" (54 mm); accepts two 500 MCM
2. Rotary selection switch: OFF, V~ , A~, V , A
3. Lever/trigger: Opens or closes jaws
4. HOLD:
Freezes last measured value on display (excluding bar graph)
Zeroes instrument during DC measurements
5. Input: Color-coded voltage input connectors
6. Display: Dual liquid crystal display, 4-digit 10,000 counts
7. MIN/MAX:
• Selects Record mode for A, V, %THD, Individual harmonics,
%DF, CF, THDF, Ripple and Peak (+/-)
• Accesses the following functions: MAX, MIN, AVG
8. SMOOTH: 3-sec averaging for easy readings on fluctuating signals
9. Hz: Selects frequency measurement (A or V input)
10. RANGE:
Selects Auto or Manual Ranging measurement ranges (A or V)
11. HARM: Accesses (in A or V) the following measurement modes:
• %THD (Total Harmonic Distortion referenced to the fundamental)
• %DF (Distortion Factor - Total Harmonic Distortion referenced to RMS)
•
CF (Crest Factor)
• K Factor (Transformer Derating Factor [A~])
12. : Hdc, H 01-H 25: Individual Harmonics (from dc - 25th order)
and +/- Peak
13. Shift: Yellow Shift key selects different measurement modes dependent
upon rotary switch position:
V~ A~ V A
Vrms Arms V A
Peak Peak Peak Peak
CF CF % Ripple % Ripple
THDF or K factor
(in HARM mode)
To measure battery voltage level status, press and hold the yellow Shift
push button for >3 seconds during any measurement mode.
- - -- - -
- - -- - -
▲
▲
- - -- - -
12 Clamp-On Harmonic Probe Model

13
Clamp-On Harmonic Probe Model
P
OFF
A
~
A
V
V
~
AEMC
INSTRUMENTS
RECORD-PAUSE MAX MIN AVG
SMOOTH THDF CFF RIPPLE AC + DC RANGE
%
kHz
AV%
RMS
PEAK
AV
3 4 521
0600
AV
+
–
–+
!
TDHF K FACTOR
ODD
HOLD
Model 725
HARMONIC METER
127 mm (5")
54 mm (2.13")
10 59
12
11
13
7
3
6
2
4
1
8
+
-

Digital Display Features
The combination digital/analog display gives measurements on a large 4-
digit LCD display. A fast responding analog bar graph display indicates
trends or surges. To view full function display, continuously depress the
HOLD push button while turning the rotary selector switch on.
A ~ True RMS amperes
V~True RMS volts
VDC volts
ADC amperes
Low battery indication
SMOOTH Indicates three-second measurement averaging to
smooth fluctuating signals
RANGE Manual range selection
HOLD Hold function is activated
RECORD Record mode is activated
PAUSE Interrupts recording mode when Hold is activated
in the Record mode
MAX Maximum measurement value
MIN Minimum measurement value
+
–
- - -
- - -
14 Clamp-On Harmonic Probe Model
P
kHz
AV%
34 521
0600
AV
%
RMS
PEAK
AV
+
–
–+
!
TDHF K FACTOR
RECORD-PAUSE MAX MIN AVG
SMOOTH THDF CFF RIPPLE AC + DC RANGE
ODD
HOLD

AVG. Average measurement value
%THD % Total Harmonic Distortion
THDF Transformer Harmonic Derating Factor (CBEMA)
K Factor Transformer Derating Factor
%DF % Distortion Factor
% Ripple Percent ripple on DC signal
CF Crest Factor
PEAK Peak (1 ms) measurement with ± sign
H xx Individual harmonic order (Hdc to H25)
ODD Displays odd order harmonics only
Relative time indication for recording function is
activated
AC + DC Measurement includes both AC and & components
Indicates beeper function is activated
Auto-Off feature disabled
Bar Graph Analog bar graph for trend measurements A or V
Display and Error Indications
OL Input overload: > 1500 Vpeak or > 1500 Apeak
- - - Input signal below measurement range
Input exceeds safety, measurement or operating
range. Discontinue measurement and refer to the
specific function and specification section in user
manual.
The primary (larger)/secondary (smaller) display allows dual monitor-
ing of measured values with the selection of the HARM push button.
These locations may also be reversed with: ON & .
▲
!
H
15
Clamp-On Harmonic Probe Model

General Measurement Notes
• Validation of push button control is verified with a short beep (2 kHz).
Invalid push button control is warned with a higher pitch beep (4kHz).
Overload indication is a constant tone.
•Maximum accuracy is achieved when the current carrying conductors
are centered within the jaw assembly of the instrument.
•When the instrument is turned on, all display segments appear while
the instrument performs a brief self-test. At the completion of the test
the instrument beeps once and begins measurements.
• Verify that the arrow indicator on the jaws of the instrument points
toward the load.
Several control functions are turned on and off by holding down a spe-
cific push button (see below) while turning the rotary selector switch
from the OFF position. The selected program function will blink on the
display; releasing the push button will then activate control, verified by a
short beep.
Function Control Push Button Display Symbol
• Beeper On/Off ON & MIN/MAX
• AC or DC+AC ON & SMOOTH AC/DC+AC
• Odd/all harmonics ON & HARM ODD
• Auto power off ON & RANGE
• Record clock ON & Hz
function
• Primary/secondary ON &
display location
• Full function display ON & HOLD All LCD
• Reset to default ON & Yellow (Shift) Default
conditions conditions
▲
16 Clamp-On Harmonic Probe Model

AC Voltage Measurements
OBSERVE ALL SAFETY PRECAUTIONS AND WARNINGS
Operating Procedure
1. The voltage input connectors are color-coded 4 mm banana jacks
located on the base of the instrument. When making voltage connec-
tions, be sure to observe the proper polarity and connection integrity.
Select the appropriate termination (test probe or clips) for the application.
Insert the RED test lead into the jack and the BLACK test lead
into the jack.
2. Turn on the instrument using the rotary selector to the voltage mea-
surement function V~. Selection is confirmed with a short beep when
exiting OFF.
3. Touch or connect the voltage test leads to the circuit under test.
4. Take a reading from the display. Voltage measurements are possible
from 50 mV to 600 Vrms, and to 1500 V Peak
COM +
17
Clamp-On Harmonic Probe Model
AEMC
INSTRUMENTS
AC
RMS
V
3 4 521
0600
V
!
Model 725
HARMONIC METER
OFF
A
~
A
V
V
~

Warning
Though the meter can display to 1499 V in Auto Range and in the 600
V manual range, the warning triangle will be displayed above 600
Vrms. This indicates that the input exceeds the specified safety and
operating range. The displayed value is only indicative and not speci-
fied.
Do not continue to operate the instrument when the input value
exceeds the meter safety and operating specifications.
OL is displayed above 1499 V peak in the Peak mode and may also be
accompanied by the warning triangle if the RMS value exceeds 600 V.
The warning triangle may also be displayed if the input signal is too
low (<50 mV) or if the fundamental is not 50 or 60 Hz.
Selecting AC and AC + DC Measurements
Voltage measurements may be displayed as AC only or as AC+DC, indicat-
ing that the measurement includes the DC component. Selection can be
made with (ON & SMOOTH) during initial ON. Please note that AC+DC
RMS value is not equal to the AC RMS reading plus the DC reading.
AC Voltage: Related Measurement Functions
In the voltage measurement mode, further power quality analysis for volt-
age is possible by pushing the following keys:
HARM Activation will change operating mode and split screen for
simultaneous measurements of:
Voltage →%THD →%DF →Voltage
(AC or DC+AC) (AC or DC+AC)
• Bar graph display.
Select individual harmonics from Hdc, H01 to H25. The
instrument will display the True RMS amplitude of the
individual voltage harmonic as well as the percentage rela-
tive to the fundamental signal (%THD) or percentage rel-
ative to the RMS value (%DF), whichever is selected prior
to or .
▲
▲
▲
▲
!
!
18 Clamp-On Harmonic Probe Model