AEMC SR634 Operating Manual

AC Current Probe
Model SR634

User Manual

DESCRIPTION

The SR634 (Catalog #2113.48) is designed for use in industrial environments. The ergonomic design
allows it to easily attach to cables or small bus bars. The “circular” jaws guarantee a very good accuracy
and low phase shift. The probe has a measurement range up to 1000 Arms. continuous and is
compatible with any AC Ammeter, multimeter, or other current measurement instrument with an input
impedance lower than 0.6Ω. To achieve the stated accuracy, use the SR634 with an ammeter having an
accuracy of 0.75% or better.

WARNING

These safety warnings are provided to ensure the safety of personnel and proper operation of the
instrument.

• Read the instruction manual completely and follow all the safety information before attempting
to use or service this instrument.

• Use caution on any circuit: Potentially high voltages and currents may be present and may
pose a shock hazard.

• Read the Safety Specifications section prior to using the current probe. Never exceed the
maximum voltage ratings given.

• Safety is the responsibility of the operator.

• ALWAYS connect the current probe to the display device before clamping the probe onto the
sample being tested.

• ALWAYS inspect the instrument, probe, probe cable, and output terminals prior to use.
Replace any defective parts immediately.

• NEVER use the current probe on electrical conductors rated above 600V in overvoltage
category III (CAT III). Use extreme caution when clamping around bare conductors or bus bars.

INTERNATIONAL ELECTRICAL SYMBOLS

This symbol signifies that the current probe is protected by double or reinforced insulation. Use
only factory specified replacement parts when servicing the instrument.

This symbol signifies CAUTION! and requests that the user refer to the user manual before
using the instrument.

This is a type A current sensor. This symbol signifies that application around and removal from
HAZARDOUS LIVE conductors is permitted.

DEFINITION OF MEASUREMENT CATEGORIES
Cat. I: For measurements on circuits not directly connected to the AC supply wall outlet such as

protected secondaries, signal level, and limited energy circuits.

Cat. II: For measurements performed on circuits directly connected to the electrical distribution system.

Examples are measurements on household appliances or portable tools.

Cat. III: For measurements performed in the building installation at the distribution level such as on

hardwired equipment in fixed installation and circuit breakers.

Cat. IV: For measurements performed at the primary electrical supply (<1000V) such as on primary

overcurrent protection devices, ripple control units, or meters.

RECEIVING YOUR SHIPMENT

Upon receiving your shipment, make 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 carrier and notify your distributor at once, giving a detailed description of any damage.

4.37"

3.98"

(57 mm)

3.90"

(111 mm)

(101 mm)

2.05"

(52 mm)

1.71"

(99 mm)

(43.5 mm)

8.50"

(216 mm)

1.22"

1.38"

1.77"

(31 mm)

(35 mm)

(45 mm)

2.25"

ELECTRICAL SPECIFICATIONS

Current Range:

1 to 1000A AC, continuous @ ≤ 1 kHz

Transformation Ratio: 250:5, 500:5, 1000:5
Output Signal: 5mA, 10mA, 20mA AC/A AC

(5A AC at 250, 500 or 1000A)

Accuracy and Phase Shift*:
Range 250:5 - 20 mA/A

Primary 1 to 5A 5A 12.5A 50A 250A 300A

Accuracy ≤ 10% ± 0.1A 10% 5% 2.5% 2% 2%

Phase N/A N/A 10° 10° 10° 10°

Overload: 300 A for 30 mn on, 15 mn OFF

Range 500:5 - 10 mA/A

Primary 1 to 10A 10A 25A 100A 500A 600A

Accuracy ≤ 6% ± 0.1A 6% 3% 2% 1% 1%

Phase N/A 6° 4° 3° 2.5° 2.5°

Overload: 600 A for 30 mn on, 15 mn OFF

Range 1000:5 - 5 mA/A

Primary 1 to 20A 20A 50A 200A 1000A 1200A

Accuracy ≤ 6% ± 0.1A 5% 3% 1.5% 1% 1%

Phase N/A 5° 3° 1.5° 1° 1°

Overload: 1200 A for 30 on, @ 15 mn OFF

(*Reference conditions: 23°C ±3°K, 20 to 75% RH, 48 to 65
Hz, external magnetic field < 40 A/m, no DC component, no
external current carrying conductor, test sample centered.)
Load impedance 0.2Ω @ lead < 40 mΩ. 0.1Ω for 250 A range.

Accuracy: Per IEC 185
Fr

equency Range: 30Hz-5kHz; current derating

above 1 kHz using the formula:
Load Impedance: 0.4Ω max
Working Voltage: 600V Cat. III
Common Mode Voltage: 600V Cat. III
Open Secondary Voltage:

< 25V by limiting circuit

Influence of Adjacent Conductor:

< 1mA/A AC

Influence of Conductor in Jaw Opening:

0.02% of reading

Influence of Frequency:

Range 250:5 - From 65 to 100 Hz < 1% of R
From 100 to 1000 Hz < 5% of R
Range 500:5 - From 65 to 100 Hz < 1% of R
From 100 to 1000 Hz < 1% of R
Range 1000:5 - From 65 to 100 Hz < 0.5% of R
From 100 to 1000 Hz < 1% of R

1000 A x 1

F

(in kHz)

MECHANICAL SPECIFICATIONS

Operating Temperature:

-14° to 122°F (-10° to 50°C)

Storage Temperature:

-4° to 158°F (-20° to 70°C)

Influence of Temperature:

< 0.13% per 10°K

Influence of Humidity:

Range 250:5 - < 0.6% & < 2°
Range 500:5 - < 0.4% & < 0.6°
Range 1000:5 - < 0.2% & < 0.2°

Jaw Opening:

2.25" (57 mm) max.

Maximum Conductor Size:

2.05” (52 mm)

Envelope Protection:

IP 40 (IEC 529)

Drop Test: 1 m (IEC 68-2-32)
Mechanical Shock:

100 g (IEC 68-2-27)

Vibration:

5 to 15 Hz, 0.15 mm (IEC 68-2-6)
15 to 25 Hz, 1 mm
25 to 55 Hz, 0.25 mm

Polycarbonate Material:

Handles: ABS Grey and
Lexan 500R, Red: UL94V0
Jaws: Lexan 500R, Red : UL94V0

Dimensions:

4.37 x 8.50 x 1.77" (111 x 216 x 45 mm)

Weight:

1.21 lbs. (550 g)

Output:

Two standard safety banana jacks (4 mm)

SAFETY SPECIFICATIONS

Electrical:

Double insulation or reinforced insulation between
the primary or secondary and the outer case of the
handle conforms to IEC 1010-2-032.

Common Mode Voltage:

600 V Category III, Pollution Degree 2

Dielectric Strength:

5550 V, 50/60 Hz between primary, secondary
and the outer case of the handle

Electromagnetic Compatibility:

EN 50081-1 Class B
EN 50082-2 Electrostatic discharge
IEC 1000-4-2
Radiated field IEC 1000-4-3
Fast transients IEC 1000-4-4
Magnetic field at 50/60 Hz IEC 1000-4-8

ORDERING INFORMATION

AC Current Probe SR634 ................... Cat #2113.48

Includes a user manual and a product warranty and
registration card

Accessories:

Leads, set of 2, 5 ft. safety (1000V)..Cat #2111.29

Banana plug adapter

(to nonrecessed plug) ......................Cat #1017.45

OPERATION

Please make sure that you have already read and fully understand the WARNING section on page 1.

Making Measurements with the AC Current Probe Model SR634

• Connect the current probe to an AC current range on your DMM or other current measuring instrument.
The AC Current Probe SR634 is a multi-ratio unit. The outputs are as follows:

Current Flow Output of Probe
in Conductor Ratio 250:5 Ratio 500:5 Ratio 1000:5

100 A 2000 mA 1000 mA 500 mA
250 A 5 A (5000 mA) 2500 mA 1250 mA

Select the 10 A range on your DMM or instrument. Use the switch on the inside handle to select the 1000:5
range. Clamp the probe around the conductor and work down until the appropriate range and resolution in
reached. Take the reading on the meter and multiply it by the ratio selected to obtain the measured current
(e.g, 500 mA reading - 500 x 200 = 100,000 mA or 100 A with the 1000:5 ratio).

• For best accuracy, avoid if possible, the proximity of other conductors which may create noise.

Tips for Making Precise Measurements

• When using a current probe with a meter, it is important to select the range that provides the best
resolution. Failure to do this may result in measurement errors.

• Make sure that probe jaw mating surfaces are free of dust and contamination. Contaminants cause air
gaps between the jaws, increasing the phase shift between primary and secondary. It is very critical for
power measurement.

MAINTENANCE:
Warning

• For maintenance use only original replacement parts.

• To avoid electrical shock, do not attempt to perform any servicing unless you are qualified to do so.

• To avoid electrical shock and/or damage to the instrument, do not get water or other foreign agents
into the probe

Cleaning

To ensure optimum performance, it is important to keep the probe jaw mating surfaces clean at all times.
Failure to do so may result in error in readings. To clean the probe jaws, use very fine sand paper (fine

600) to avoid scratching the jaw, then gently clean with a soft oiled cloth.

REPAIR AND CALIBRATION

You must contact our Service Center for a Customer Service Authorization number (CSA#). This will
ensure that when your instrument arrives, it will be tracked and processed promptly. Please write the CSA#
on the outside of the shipping container. If the instrument is returned for calibration, we need to know if you
want a standard calibration, or a calibration traceable to N.I.S.T. (includes calibration certificate plus
recorded calibration data).

Chauvin Arnoux

®

, Inc. d.b.a. AEMC® Instruments

15 Faraday Drive • Dover, NH 03820 USA

Tel: [phone] (Ext. 360)
[phone] (Ext. 360)
Fax: [phone] or [phone]

[e-mail]
(Or contact your authorized distributor)
Costs for repair, standard calibration, and calibration traceable to N.I.S.T. are available.

NOTE: All customers must obtain a CSA# before returning any instrument.
TECHNICAL AND SALES ASSISTANCE

If you are experiencing any technical problems, or require any assistance with the proper use or
application of this instrument, please call our technical hotline:

[phone] • [phone] • Fax [phone]

Chauvin Arnoux

®

, Inc. d.b.a. AEMC® Instruments
[e-mail]
www.aemc.com

99-MAN 100134.v5 04/09