First-Time Operation; Connecting The Instrument; Turning On The Hm8118; Setting Of The Line Frequency - Hameg HM8118 Handbuch

F i r s t - t i m e o p e r a t i o n

First-time operation

Prior to fi rst-time operation as well as after each transport, check
the shipping box and the instrument carefully for any damage.
Do not operate the instrument if there are any signs of damage
to parts of the housing (e.g. covers, displays). If the shipping box
or the packing material show signs of damage by the transport,
the contents of the box should be checked for completeness and
the measuring instrument for mechanical integrity and electrical
function. If the contents are incomplete, if there are mechanical or
electrical defects, or if the instrument fails to perform a self-test
after turn-on, please contact an authorized dealer or the Hameg
service centre in Germany. (See page 29.)

Connecting the instrument

Prior to connecting the instrument to the mains, check whether
the mains voltage conforms to the mains voltage range spe-
cifi ed on the rear panel. This instrument has a wide-range
power supply and hence requires no manual setting of the
mains voltage.
Warning! This measuring instrument is solely des-
tined for use by qualifi ed personnel well informed
about the dangers that go along with the measure-
ment of electrical parameters. For elementary
safety reasons this instrument must only be con-
STOP
nected to mains wall outlets with a safety ground
connector. The safety ground conductor must not
be disconnected. It is important to always fi rst con-
nect the safety ground contact in the line cord with
the safety ground contact in the wall outlet before
any other connections to the instrument are made
(I.e. plug the line cord in fi rst of all).
As a general rule the instrument must always be turned on and
be ready to operate fi rst before a measuring signal is applied.
If a functional problem of the instrument becomes obvious, no
further measurements should be entertained; the measuring
signals should be removed and the instrument turned off.
The fuse holder of the BIAS FUSE, i.e. the external bias input,
is accessible on the rear panel. Prior to exchanging a fuse the
instrument must be disconnected from the mains. Then the
fuse holder may be removed with a suitable screw driver, using
the slot provided.
Then the fuse can be removed from the holder and exchanged.
The holder is spring-loaded and has to be pushed in and turned.
It is prohibited to use „repaired" fuses or to short-circuit the
fuse. Any damages incurred by such manipulations will void the
warranty. The fuse may only be exchanged by this type:
Location of the BIAS FUSE at the rear panel
32
Subject to change without notice
Type of fuse:
F 0.5 A
Size 6.3 x 32 mm, ceramic body, fi lled with fi re extinguishing
material,
400 V AC, C, IEC 127 p. III. DIN 41 662 (alternatively DIN 41
571, p. 3)

Turning On the HM8118

Turn on the LCR bridge by
pressing the power switch
on the front panel. All push-
buttons will light up for a
moment, then the instrument
will be ready to operate, using
the pushbuttons and the knob. In case the pushbuttons and dis-
play do not light up, either the mains voltage is missing or any of
the internal mains fuses is open, see p. 29. The measurement
results are shown on the right-hand side of the display, the
most important parameters on the left-hand side. The com-
ponents to be tested are connected to the 4 BNC front panel
connectors either directly or using the appropriate accessories.
A 4 mm banana jack is also provided for a direct connection of
the instrument to a suitable ground potential.
Please note!
Unplug any test adapter or accessory for compo-
nent measurements by pulling straight towards
you.
STOP
Warning!
The front panel ground connector and the ground
contact of the trigger input are directly connected
to the mains safety ground potential through the
line cord, however, the outer contacts of the front
STOP
panel BNC connectors (as well as the shields of
any coaxial cables attached) are connected to the
GUARD potential which has no connection to the sa-
fety ground! No external voltages may be applied to
the BNC connectors. The rear panel interfaces are
galvanically isolated (no connection to ground).
If there are unidentifi able messages on the display, or if the
instrument fails to react to operation of its controls: turn it off,
wait a minute and turn it on again in order to trigger a reset
operation. If the display remains unchanged or operation im-
possible, turn it off and take it to a qualifi ed service centre. (See
page Service Addresses.)

Setting of the line frequency

Prior to any measurements, the line frequency setting must
be set to the applied line frequency, 50 or 60 Hz. If the line
frequency is not properly set, depending on the measurement
range and the line frequency value, instabilities may occur e.g. in
the display. In order to set the line frequency press the SELECT
3
button , use the SYST menu for accessing MAINS FRQ, use
6
the knob for selecting the correct value.
Storing/recalling of instrument settings
and parameters
There are 9 settings memories 0 to 8. In order to recall/store a
setting, press the RECALL/STORE button which allows recall
or store any of the settings. If after turn-on the memory 9 is
selected the factory setting will be shown (reset), this will not