RESISTOMAT
®
Model 2302-V001
Page 10
Introduction &
applications
Description of functions
Brief guide
Operation
Calibration
Test and offset
instructions
RS232 data
output
Accessories and Circuit diagram
Introduction &
applications
Applications
Originally developed for monitoring conductances during the manufacture and final testing
of high-tension cables, RESISTOMAT
®
equipment later took on a significance in many other
areas, involving not only Thomson measurements but also, to a large extent, classical
Wheatstone measurements.
This equipment has the following applications in the cable industry:
-
Resistance measurements of meter-samples, ranging from the smallest to
the largest cross-sections
-
Conductivity checks in stranding
(in conjunction with automatic control)
-
Final acceptance of cable drums
In laboratories for testing motors and transformers, RESISTOMAT
®
equipment is used to
measure coil resistance and heating (thermal co-efficient of resistance) and for testing the
quality of welded joints on commutators.
The RESISTOMAT
®
also proves useful in metallurgical investigations based on resistance
measurement.
Statistical quality control with computerized evaluation only became efficient on introduction
of the RESISTOMAT
®
with an RS232-C output allowing fast measurement sequences.
The number of samples has been increased five-fold compared with the traditional method,
without the need for qualified personnel to perform measurement tasks.
If you obtain some unkown resistance, you can quickly read off its value up to a maximum
of 20 k
Ω
on your RESISTOMAT
®
.
Simply connect it to + U / - U, and link + U / + I and - U / - I. Usually, the wire ends on the test
object are sufficient for this.
Highly accurate temperature measurements are also possible with the RESISTOMAT
®
.
A Pt-100 sensor provides readings to an accuracy of 10 m
Ω
, even 1 m
Ω
for low
temperatures, at a sensor current of 1 mA.
Last but not least, the RESISTOMAT
®
serves as a precise and highly stable current source
which can be used separately for calibrating moving-coil instruments or other powered
measuring devices; it also serves as a precision, high-resolution digital voltmeter for low
voltages (max. 0.5 V final value) . This allows the measurement and testing of thermal e.m.fs
and mV sources. e.g. the thermocouple simulator made by burster präzisionsmeßtechnik.
