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.