OPERATING MANUAL MMR-630 Revision 1.6
14
3
Measurements
Note:
Measurements are performed with direct current.
3.1 Configuration of the measurement options
Before you proceed to measurements, adjust the parameters of the measurement process to the
properties of the measured object. This is done by selection of the appropriate options in
MENU
–
Measurement mode
.
3.1.1 Selection of the type of object
The MMR-630 meter permits selection of one of the three types of objects:
The measurement marked with the
symbol is the shortest measurement (3s) and its
purpose is to test objects of purely resistance-related character.
The
symbol means the measurement mode for inductive objects. This mode is
based upon special object charging procedures, which are indispensable to perform correct meas-
urements of resistance of highly inductive objects. In this mode the duration of the measurement de-
pends upon the inductance of the object, since the meter automatically selects the maximum possible
measurement current and it waits until the current has stabilised.
In the second measurement mode for inductive objects (
) measurements are per-
formed before the current stabilises completely. This solution permits to significantly reduce the dura-
tion of measurements of inductive objects, but it must be held in mind that the accuracy of the meas-
urement may be impaired.
If an approximate value of the resistance of the inductive object is known, then it is possible to re-
duce the duration of the measurement selecting manual adjustment of the measurement range
(Chapter 3.1.5) and to set the appropriate range (measurement current ) using the rotary knob. The
declared precision of measurements is then maintained.
Summary of Contents for MMR-630
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