Table of Contents
Advertisement
another with 1500V 50Hz. Under certain conditions,
5 0 Hz or 6 0 Hz hum voltages can occur in the measuring
circuit due to interconnection with other mains/line
powered instruments or devices. This can be avoided by
using a protective isolating transformer between the
mains/line outlet and power plug of the HM 203. Without
an isolating transformer, the instrument's power cable
must be plugged into an approved three-contact elec
trical outlet, which meets International Electrotechnical
Commission (IEC) safety standards.
Warning!
Any interruption of the protective conductor inside or
outside the instrument or disconnection o f the protec
tive earth terminal is likely to make the instrument
dangerous. Intentional interruption is prohibited.
if a protective isolating transformer is used for the
display o f signals with high zero potential, it should be
noted that these voltages are also connected to the
oscilloscope's case and other accessible metal parts.
Voltages up to 4 2 V are not dangerous. Higher
voltages, however, involve a shock hazard, in this
case, special safety measures must be taken and must
be supervised by qualified personnel.
As with most electron tubes, the cathode-ray tube
develops X-rays. With the HM203 the dose equivalent
rate falls far below the maximum permissible value of
36pA/kg.
Operating Conditions
Admissible ambient temperature range during operation:
+ 1 0°C ... + 40°C. Admissible ambient temperature
range
for
storage
... + 70°C. If condensed water exists in the instrument it
should not be turned on before acclimatization is
achieved. In some cases (an extremely cold oscilloscope)
about two hours should be allowed before putting the in
strument into operation. The instrument should be placed
in a clean and dry room In other words, the instrument
may not be put into operation in explosive, corrosive,
dusty, or moist environments. The instrument may be
operated in any position, however, the convection cool
ing must not be impaired. Therefore, when the instru
ment is in continuous operation it should be used in the
horizontal position preferably on its tilt stand.
The instrument must be disconnected and secured
against unintentional operation if there is any presump
tion that safe operation is not possible. This supposition
is qualified
— if the instrument has visible damage,
— if the instrument has loose parts,
M2 203-4
or
transportation:
— 40°C
— if the instrument does not function,
— after a long storage under unfavourable
circumstances (e.g. out of doors or in moist
environments),
— after excessive transportation stress (e.g. in poor
packaging).
Use of the Tilt Handle
The handle of the oscilloscope can be fixed in three posi
tions, one for use as a carrying handle and two positions
as a tilt stand. With the tilt handle the instrument can be
inclined 10° or 20° to the horizontal.
Handling is as follows:
— Place the HM203 on its rear feet. The front drop-in
pins in the hinges will fall back into the front groove of
the notched discs (fixed on cabinet).
— Pull the handle only about 5 mm out of its locking posi
tion and turn it towards the lower edge of the front
panel.
— Lock the handle into the required position by pushing it
back towards the hinges.
— Place the instrument in its work area.
First Time Operation
Check that the instrument is set to the correct
mains/line voltage.
On delivery, the instrument is set to AC 240V ±1 0 %
(50-60Hz) mains/line voltage. The power plug-in unit at
the rear contains the three-pin power connector. For this
a three wire power cord with triple-contact connector
and three-pole power plug is required. The unit also con-
Advertisement
Table of Contents
