Hameg Instruments HM8001-2 Handbuch Seite 16

for replacement. Both the use of makeshift
fuses and short-circuiting of fuse holders are
prohibited.
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 instrument.
All voltages for operating the modules are
supplied from the multipoint connector
contacts in the individual module compart-
ments. 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 2x 5V DC = 2x5Ω, 5Watts
for 4x20V DC = 4x40Ω, 10Watts
To avoid damaging the multipoint connector
contacts, the resistors should be linked to a
corresponding 22 pole connector, onto which
the required 1.3kΩ resistors and the four
appropriate wire connectors can be soldered
for programming the 4x20V potential. The dia-
16
gram at the foot of this page 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
Rated current manufacture and when using 1% resistors, the
T 2 A max. error is not more than 2%. Variations in
T 1 A 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. 3mV
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.
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.
. Only voltmeters with at least 0.1%
pp