99-MAN 100079.v7 07/13
OPERATION
Please make sure that you have already read and fully understand the WA
RNING section on page 1.
Making Measurements with the AC Current Probe Model MD303
•
Connect the black and red terminals to the 2V range of y
our DMM or current measuring instrument.
Select the appropriate current range (2V AC range). Clamp
the probe around the conductor to be tested
with the arrow pointed toward the load. If the reading is less than 200mV, select the lowe
r range until you
obtain the best resolution. Read the value display on the DMM and multiply it by
the probe ratio (1000/1).
(If reading = 59mV, the current flowing through the probe is 59 x 1000 = 59000mA or 59A).
•
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 prov
ides 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 ve
ry 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 y
ou 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 surf
aces 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 Author
ization number (CSA#). This will
ensure that when your instrument arrives, it will be tracked and processed promptly. Please wr
ite the CSA#
on the outside of the shipping container.
Chauvin Arnoux
®
, Inc. d.b.a. AEMC
®
Instruments
15 Faraday Drive
Dover, NH 03820 USA
(800) 945-2362 (Ext. 360) • (603) 749-6434 (Ext. 360) • [email protected]
(Or contact your authorized distributor)
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 wi
th the proper use or
application of this instrument, please contact our technical hotline:
(800) 343-1391 • (508) 698-2115 • [email protected]
LIMITED WARRANTY
The current probe is warranted to the owner for a period of one year from the dat
e of original purchase
against defects in manufacture. This limited warranty is given by AEMC
®
Instruments, not by the
distributor from whom it was purchased. This warranty is void if the unit has been tampered wi
th, abused
or if the defect is related to service not performed by AEMC
®
Instruments.
Full warranty coverage and product registration is available on our website at:
www.aemc.com/warranty.html.
Please print the online Warranty Coverage Information for your records.
AC Current Probe
Model MD314
User Manual
The MD314 (Catalog #2110.75) is designed for use in industrial environments. The hook-shaped jaws
enable the user to “pry” into or “hook” onto cables (will accept 2 x 500 MCM) or even smaller bus bars.
The current output up to 500Arms. continuous makes it the perfect tool for measurement with DMMs,
recorders or instruments with current ranges. The Model MD314 offers a 5ft. lead with safety 4mm
banana plug.
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. 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.
INSTRUMENT COMPATIBILITY
The Model MD314 is compatible with any voltmeter, multimeter, or other voltage measuring instruments
with an input impedance lower than 1M
. To achieve the stated accuracy, use the MD314 with a
voltmeter having an accuracy of 0.75% or better.
