Mains/Line Voltage Change; Calibration And Test Instructions - Hameg Instruments HM8001-2 Manuel D'utilisation

Mains/Line Voltage Change

On delivery, the instrument is set to AC 230 V mains/
line voltage. The instrument has an appliance inlet at
the rear. This device contains the power fuse, which
is interchangeable for the different mains/line volta-
ges. The fuse holder can be pulled out by means
of a small screwdriver (after disconnection of the
power cord from the appliance inlet). Change the
power voltage by switching over the voltage selector
switch. The fuse holder should then be plugged in
again in the desired position.
The power fuse has to match to the set of the
mains/line voltage and must be changed if neces-
sary. Make sure that only fuses with the required
rated current and of the specifi­ed type are used for
replacement.
It is forbidden to repair defective fuses
or to bridge them by no means. Any
damage caused this way will void the
warranty.
Required power fuse-link:
5x20mm, slow-blow, 250V~, C, to IEC 127/III;
DIN 41662.
Mains/line voltage
115 V~ ±10%:
230 V~ ±10%:

Calibration and Test Instructions

Remove case to calibrate and test the instrument.
All voltages for operating the modules are sup-
plied from the multipoint connector contacts in
Rear panel
Signal In-/Outputs
1
for the right module
compartment
(Option HO801)
Rated current
T 2 A
T 1 A
Mains/Line
Voltage Input
and fuse
O p e r a t i n g t h e H M 8 0 0 1 - 2
the individual module compartments. The easiest
way of testing is by measuring them on inserted
high power consumption modules (e.g. HM8030
or HM8035). However, high power consumption
can also be simulated using resistors with the
following values:
for 2 x 5 V
DC
for 4 x 20 V
DC
To avoid damaging of the multipoint connector
contacts, the resistors should be linked to a
corresponding 22 pole connector, onto which the
required 1.3 k resistors and the four appropriate
wire connectors can be soldered for programming
the 4 x 20 V potential. The diagram (page 18) shows
the values assigned to the multipoint connector
contacts.
The accuracy of the DC voltages is partly depen-
dent on the reference voltage setting and the tole-
rance of the resistors used for programming. With
the 1% accuracy set during manufacture and when
using 1% resistors, the max. error is not more than
2%. Variations of the mains/line voltage of ±10%
should not affect the supply voltages by more than
0.5%. The highest tolerable hum and noise level
is max. 3 mV . Only voltmeters with at least 0.1%
pp
accuracy should be used for all measurements.
These should be connected directly to the multi-
point connector contacts, as otherwise voltage
drops could influence the test results.
If the specifi­ed tolerances are not met, the cause
must be located and recalibration of the reference
voltages may possibly be necessary.
Mains/Line
Voltage selector
Subject to change without notice
= 2 x 5 , 5 Watts
= 4 x 40 , 10 Watts
Signal In-/Outputs
for the left module com-
partment
(Option HO801)
17