MMR-650 – USER MANUAL
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1
Safety
MMR-650 is a meter designed for measuring resistance of various types of connections (welded,
soldered, butt) in electrical installations as well as in inductive devices (transformers, motors) and it is
used to obtain results that determine safety condition of electrical installations. Therefore, in order to
provide conditions for correct operation and accuracy of obtained results, the following recommenda-
tions must be observed:
•
Before you proceed to operate the meter, acquaint yourself thoroughly with the present manual and
observe the safety regulations and specifications provided by the producer.
•
MMR-650 meter is designed to measure low-resistance values. Any application that differs from
those specified in the present manual may result in a damage to the device and constitute a source
of danger for the user.
•
In case of measurements on systems, components and devices that may be under dangerous volt-
age, MMR-650 may be used only by qualified persons who are authorized to work on electric instal-
lations. Unauthorized use of the meter may result in its damage and may be a source of serious
hazard to the user.
•
Using this manual does not exclude the need to comply with occupational health and safety regula-
tions and with other relevant fire regulations required during the performance of a particular type of
work. Before starting the work with the device in special environments, e.g. potentially fire-risk/ex-
plosive environment, it is necessary to consult it with the person responsible for health and safety.
•
It is unacceptable to operate the device when:
⇒
a damaged meter which is completely or partially out of order,
⇒
a meter with damaged insulation,
⇒
a meter stored for an excessive period of time in disadvantageous conditions (e.g. excessive
humidity).
If the meter has been transferred from a cool to a warm environment with a
high level of relative humidity, do not start measurements until the meter is warmed up
to the ambient temperature (approximately 30 minutes).
•
Before measurement make sure that test leads are connected to appropriate measuring terminals.
•
Do not operate a meter with an open or incorrectly closed battery compartment and do not power it
from other sources than those specified in this manual.
•
The inputs of the meter are protected electronically against overload e.g. due to having been con-
nected to a live circuit:
- for all combinations of inputs - up to 600V for 10 seconds.
•
Repairs may be performed only by an authorised service point.
•
The device meets the requirements of EN 61010-1, EN 61010-2-030 and EN 61010-031.
Note:
The manufacturer reserves the right to introduce changes in appearance, equipment and
technical data of the meter.
Note:
An attempt to install drivers in 64-bit Windows 8 and Windows 10, may result in display-
ing "Installation failed" message.
Cause: Windows 8 and Windows 10 by default block drivers without a digital signature.
Solution: Disable the driver signature enforcement in Windows.
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