Mains/Line Voltage Change; Calibration And Test Instructions - Hameg Mainframe HM8001-2 Manual Del Usuario

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 diffe-
rent mains/line voltages. 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 necessary.
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
supplied from the multipoint connector contacts
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
in 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:
= 2 x 5 Ω, 5 Watts
for 2 x 5 V
DC
= 4 x 40 Ω, 10 Watts
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 kΩ 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 dependent
on the reference voltage setting and the tolerance
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 multipoint
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
H M 8 0 0 1 - 2
Signal In-/Outputs
for the left module
compartment
(Option HO801)
19