Atec Megger-247000 Series - Manual

247000 Series
Digital Low Resistance Ohmmeters
■ Resolution to 0.1 µ Ω on 599.9 µΩ range
■ Standard accuracy of ±0.25%
■ Digital readout
247000 Series
Digital Low Resistance Ohmmeters
DESCRIPTION
Digital Low Resistance Ohmmeters (DLRO ® ) are a family of
highly accurate instruments that provide a simple, practical
and reliable means of making low-resistance tests in the
field. They also are ideal for production quality control.
They operate on the four-wire measurement principle, thus
eliminating lead and contact resistances. With basic
accuracies of ±0.25% and resolution down to 0.1 µ
Ω, they
are nonetheless designed to be rugged and portable for
use at the job site. A variety of optional test leads and
calibration resistance standards are offered for use with
DLROs.
APPLICATIONS
Operation is simple: just connect the leads, turn the
instrument on and read the measurement directly from
the digital LED display. No warm-up is required.
Typical applications include measuring the resistance of:
■ Switch and circuit breaker contacts
■ Transformers and generators
■ Motor windings
■ Busbar and other joints
■ Aircraft, rail and pipe bonds
■ Cable splices, welds and fuses
■ Metal alloys
■ Graphite electrodes and other composites
■ Wire and cable
General-Purpose DLROs
Two models specially designed for general-purpose testing
applications are available.
Each provides up to 10 amperes of test current for
measuring resistances to 60 ohms with 1 µ
Ω resolution
and ±0.25% accuracy.
Dual-Pak General-Purpose Model, Cat No. 247000
This battery-powered unit features separate measuring and
charger modules for maximum portability. The charger can
be left in the shop, and the measuring module taken to
the job site.
It weighs less than 8 pounds (3.6 kg) and provides hours
of testing.
Single-Pak General-Purpose Model, Cat. No. 247001
This compact instrument packages measuring circuits,
rechargeable batteries and charger in one self-contained
unit.
Ruggedly built to handle the most demanding field
applications, the Single-Pak is housed in a tough Noryl
®
case with hinged, removable lid and carrying handle.
This model also includes captive wing nuts.
Single-Pak/Low-Range Model
Cat. No. 247002
This model provides an extra range, 0 to 599.9 µ
Ω, for
applications requiring 0.1 µ
Ω resolution. It also features a
current-reversing switch to average out any voltage offset
in the test sample. Captive wing nuts are also standard.