PROTECTION
CIRCUITS
The
MTC 9000 is
provided with the following
protection circuits:
a)
Protection against
excessive x-ray radiation.
This
circuit is
obligatory in many countries, and ensures that, with the worst
cathode-ray tube
and with
a breakdown
in any part
of the monitor, x-ray
radiation wiii not exceed
0.5 mR/h. This is the international
safety
limit;
however,
in practice,
statlsticai
measurements made on Hantarex production
show that radiation
never
exceeds 0.1
mR/h.
b)
Protection of the
Power Suppiy Unit.
This circuit
protects the power
unit from accidental short-circuit which
couid happen
during installation
or adjustment
of the
monitor.
DEGAUSSING
CIRCUIT:
Demagnetizing time
5 s
Time
between
successive
Demagnetizations
<
30
min.
NOTE:
•
The
monitor must be left switched-off between successive de-magnetizctions.
•
Normally the degaussing circuit
operates automatically each time
it Is switched on; there
is available,
on request,
an accessory
comprising a connector, a
cable and
a
push-button, which provides
for manual operation
of the
de-goussing circuit.
BEAM CURRENT LIMITER:
Level of limit 1 mA
approx.
FUSES:
F1 2 AT
(slow-blow)
F2
3
AT
(slow-blow)
NOTE:
Fuse
F1 protects the whole
monitor with the exception of the
de-gaussing circuit. Fuse F2
protects the
de-gaussing
circuit
only.
INSTALLATION
a)
Connect to
the power source as follows via connector CC:
Contacts
1-2
to
an isolated source (see note) of alternating current at
128V,
50-400
Hz
capable of
supplying
100VA.
Alternatively one may use a
direct current supply in the range
155-200
V, irrespective
of polarity,
subject
to its being
isolated
from chassis or earth, as, for
example,
one of the Hantarex series
US
200/US 250/US 300.
(see the note)
Contacts
3-4
to the
mains supply at
220-240
V a.c,
50-60
Hz.
b)
Connect to the
signal source as follows via connector CA:
Contact 1 positive
video signal BLUE (B)
Contact 2
positive video
signal GREEN (G)
Contact 3
positive video
signal RED (R)
Contact 4
common signal earth (GND)
Contact
5 vertical sync. (V
SYNC)
(or no connexion if using
composite
sync.)
Contact
6
horizontal
or composite sync
'%^
SYNC)
Important
The use of
on isolating transformer
is obligatory; it needs a power capacity of at
least iOOVA and
to be constructed
to meet
local
safaty regulations.
Hantarex accepts no responsabiiity for any harm to persons or property
resulting from
non-observance
of this warning.
Important
It is
obligatory that the
direct current source shall be «floating3», i.e. without any reference
to earth
or chassis,
such as in the
case of the
Hantarex
US
200/US 250/US
300.
c)
Connect
the Earth wire to the metal structure as prescribed
by safety regulations.
d)
Set the sync, selector switch (SW4) to adjust the
monitor
for the type of synchronizing
signals
available;
SW4
functions
on
both composite sync, and on separate sync, (simultaneously).
e)
Set the
input selector SW3 to adjust the monitor
to
accept the level
of video signal
available;
the monitor
functions
in the range
1.5
-
5
V
p.p.
f) If necessary is possible to
invert the image (vertically and
horizontally)
by inserting the
connector
to the
deflexion
yoke
in position CL.
g)
If it is
necessary to adjust the controls on the removable control panel
(either with
the panel
inserted in
the chassis
or connected via its
extension lead) the image characteristics
are optimized
as follows:
H freq.
-
horizontal
scan frequency
Adjust within the range 15.625
-\-/-
0.3 l<Hz to
obtain the
most stable
display.
V freq.
-
vertical scan frequency
Adjust from the condition where the image
scrolls upwards
to obtain
a stable
display.
V ampi-.
-
vertical scan amplitude
Adjust for optimum display height.
H
ampl.-
horizontal scan amplitude
Adjust for optimum display width.
H phase
-
horizontal phase
Adjust for correct horizontal positioning of the
display.
V shift
-
vertical shift
Adjust for correct vertical positioning
of the display.
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