GMC-I Messtechnik GmbH
7
Several well-tuned protection means protect the instrument against
damage through improper handling and overload within the specified
limit values for overload:
•
Overdimensioned precision resistors
•
Melting fuse in conjunction with protective power diodes
•
Overvoltage arrester
The instrument operates independent of the mains on a commercially
available 9 V flat cell battery. Thanks to the low power consumption of
the electronic components, a long battery life is assured.
The rugged design of the multimeter assures fine protection in the
case of rough mechanical duty. In closed condition, the instrument
offers additional mechanical protection for the measuring unit and the
indicating unit. The connection sockets are protected against acciden-
tal contact. Both the special measuring leads the connection plugs of
which are protected against accidental contact (lead set KS 17) and all
measuring leads with conventional banana plugs (4 mm diameter) can
be used.
4
Operation
4.1
Controls
ON/OFF switch
The toggle switch is used to turn the instrument on and off. This switch
should be switched to the "OFF" position when the instrument is not
operated for extended periods of time in order to avoid unnecessary
load on the battery. Apart from that, even a leakproof battery may leak
when the instrument remains turned on for several days with a dis-
charged battery. Damages caused by leaking batteries are not covered
by the instrument warranty.
When the instrument is closed, the battery is automatically discon-
nected.
Range switch
The multimeter has only one rotary switch. All measuring ranges are
selected with it. Without disconnecting the measured variable, it is
possible to switch from the DC voltage ranges to the corresponding
AC voltage ranges or from the DC current ranges to the corresponding
AC current ranges. The measuring circuit is not interrupted when
