Operation Of The Module; Module Power Supply - Hameg Mainframe HM8001-2 Manual Del Usuario

sections "Operational 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 detach mains/line cord and
any other connected cables from case of the
mainframe HM8001-2. 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.
Cleaning the HM8001-2
The exterior of the mainframe should be regularly
cleaned with a small brush. Stubborn stains on
case, handle, plastic and aluminium parts should
be wiped with a damp cloth (water +1% mild
detergent). Remove grease with methylated spirit
or a suitable spirit-based cleaning agent. Utmost
care should be taken to ensure that no cleaning
fluid drops inside the instrument.

Operation of the module

Provided that all hints given in the operating
instructions of the HM8001-2 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
pre-cautions should be observed: Before ex-
changing 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 HM8001-2 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.
I m p o r t a n t h i n t s
Generally, the HM8001-2 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.

Module Power Supply

All supply voltages required for module operation
are generated by the built-in power supply unit
of the HM8001-2. As already mentioned, both
module compartments are electrically separate
from each other. The multipoint connectors in
the module compartments are numbered from 1
to 22. Further markings indicate the type of
voltage and potential across the terminals. In
some cases, several different types of voltages
or even different values can be drawn from one
voltage source, as can be seen from the diagram
(see next page) and from the circuit diagram. The
AC voltages of the secondary windings are applied
to the terminals marked V
or voltage regulation therefore can be carried out
in the modules if desired.
In case the HM8001-2 is equipped with the option
HO801, no. 1 and 2 contacts are directly
connected to the rear panel BNC terminals,
through which signals are fed or supplied in some
modules. They can also be connected to control
points in the modules.
Caution! A potential higher than 42 V
must not be applied under any cir-
cumstances.
Subject to change without notice
. Rectification and/
AC
17