Resistance Measurements - Promax PD-183 Manual Del Usuario

7. Never apply a voltage between the COM terminal and current
terminals.
8. When switching between current ranges to obtain greater
accuracy and better resolution, completely de-energize the circuit to
be measured before changing the range.

4.6 Resistance measurements

CAUTION
Turn off power on the test circuit and discharge all
capacitors
measurements. If an external voltage is present across a
component, it will be impossible to take an accurate
measurement of the resistance of that component.
1. Insert the BLACK and RED test leads into the COM and VΩ input
terminals respectively.
2. Set the rotary selector switch to the (Ω) position. If appears in
display the overange indicator when making a measurement, you
must choose a higher range.
3. Connect the BLACK and RED test probe tips to the circuit or
device under test, making sure it is de-energized first.
4. The resistance in the test leads can diminish the accuracy in the
lowest range (200Ω). The error is generally from 0.1 to 0.2 Ω for a
standard pair of test leads. Always choose the smallest range
possible. Shortcut the terminals and observe the reading and
subtract it when making a measurement.
Page 16
before attempting
USER'S MANUAL PD-183
in-circuit resistance
07/2015