Maintenance; Operation Of The Module - Hameg HM8018 Manual

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telephone number to ensure rapid service.
The instrument should be returned in its original
packaging for maximum protection. We regret
that transportation damage due to poor packaging
is not covered by this warranty.

Maintenance

The most important characteristics of the instru-
ments should be periodically checked according
th the instructions provided in the sections "Ope-
rational check and "Alignment procedcure. To
obtain the normal operating temperature, the
mainframe with inserted module should be turned
on at least 60 minutes before starting the test.
The specified alignment procedure should be
strictly observed. When removing the case de-
tach mains/line cord and any other connected
cables from case of the mainframe HM8001.
Remove both screws on rear panel and, holding
case firmly in place, pull chassis forward out of
case. When later replacing the case, care should
be taken to ensure that it properly fits under the
edges of the front and rear frames. After removal
of the two screws at the rear of the module, both
chassis covers can be lifted. When reclosing the
module, care should be taken that the guides
engage correctly with the front chassis.
Digital display (7-segment LEDs)
3½-digit display of the measurement value. The
indication is made with the correct point position
according to the selected measuring range.
Overflow indication by „1" in the first position.
The display field contains 4 LEDs for indication
of the Ω/kΩ/µS/mS dimensions in the individual
modes as well as 1 LED for indication of a
14

Operation of the module

Provided that all hints given in the operating
instructions of the HM8001 Mainframe were
followed especially for the selection of the correct
mains voltage start of operation consists practically
of inserting the module into the right or left opening
of the mainframe. The following precautions should
be observed:
Before exchanging the module, the mainframe
must be switched off. A small circle (o) is now
revealed on the red power button in the front
centre of the mainframe. If the BNC sockets at the
rear panel of the HM8001 unit were in use before,
the BNC cables should be disconnected from the
basic unit for safety reasons. Slide in the new
module until the end position is reached. Before
being locked in place, the cabinet of the instrument
is not connected to the protective earth terminal
(banana plug above the mainframe multipoint
connector). In this case, no test signal must be
applied to the input terminals of the module.
Generally, the HM8001 set must be turned on and
in full operating condition, before applying any test
signal. If a failure of the measuring equipment is
detected, no further measurements should be
performed. Before switching off the unit or
exchanging a module, the instrument must be
disconnected from the test circuit.
polarization voltage (2 V DC) during capacitance
measurement.
Rs (pushbutton)
Selection of the „series resistance" mea-
surement.
This mode permits to determine the series
resistance of inductor coils. The reading is in Ω
Änderungen vorbehalten / Subject to change without notice