10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110
•
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INSTRUMENT DESCRIPTION
SECTION 1
INSTRUMENT DESCRIPTION
INTRODUCTION
1.1 Purpose
The Model R1L-D1 is a portable microohmmeter designed to
measure low resistances and resistance temperature detectors
(RTD's) with high accuracy. Normally, 4-wire measurements
are utilized in order to eliminate any errors caused by the
lead resistance. Additionally, 2 or 3-wire measurements may
be made. Two leads are used to pass a regulated current
through the resistance under test in series with an internal
precision calibrated resistor. Two separate leads are used to
measure the voltage drop across the external resistor; this
voltage is then compared with the voltage drop across the
internal resistor. The value of the external resistor is then
calculated from the ratio of these two voltage readings. A
microprocessor, with TEGAM proprietary firmware functions,
performs all calculations such as range selection, display
information etc.
1.2 Performance Characteristics
This is an automatic range-selection instrument, with manual
over-ride of one range step.
Range
Full
Scale (Ω)
Resolution
(Ω)
Test Current
Peak (mA)
1
0.199999
1 µ
50
2
1.99999
10 µ
50
3
19.9999
100 µ
50
4
199.999
1 m
0.5
5
1999.99
10 m
0.5
Table 1: Ranges
