User Manual
AC Current Probe
Model JM830A
DESCRIPTION
The JM830A (Catalog #2110.83) is designed for use in industrial environments. The “squared” jaws permit
multiple conductor or bus bar positioning. The current output makes it the perfect tool for measurement with
DMMs, recorders, power and harmonic meters. The Model JM830A is compatible with any AC ammeter,
multimeter, or other current measuring instruments with an input impedance lower than 5Ω. To achieve the
stated accuracy, use the JM830A with a DMM having an accuracy of 0.75%.
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.
