Hitachi V-209, Operation Manual

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quency signal (30Hz or less).
TV(V) This setting is used when observing the enure
vertical picture of television signal.
TV(H) Th1s setting is used when observing the entire
horizontal picture of television signal.
(NOTE) Both TV V and TV H synchronize only when
the synchronizmg signal is negative.
(5)
Miscellaneous
@
EXT BLANK connector
Input terminal for brightness modulation. It is of the
DC
coupling. The brightness is reduced with a positive signal
and increases with a negative signal.
@
CAL O.SV tip
Output terminal of calibration square wave of about
I
kHz and O.SV. It has a tip terminal. It is used to cali­
brate the probe combination.
@
GND terminal
Earth terminal of the oscilloscope.
5. BATTERY OPERATION
Operation of battery pack AD-
209
I)
Set the Power source select switch
(j)
to
DC
and the
Power mode select switch
@
to DC OP.
2)
Tum on the POWER switch
CD.
Then the V-:!09 starts
to operate on the power from the AD-:!09.
The continuous operation time is one hour and half. If
the battery is operated 1n excess of this period, the ter­
minal voltage will decrease sharply and the battery will
be in the over-discharged condition.
In this model, an alarm circuit will be activated before
the over-discharging and the POWER lamp
G)
starts to
Oash. In this case, charge the battery immediately.
Note: When the alarm c1rcuit
IS
energized and the volt­
age is lowered down to IO.SV, the power of the
V-209 is off automatically to prevent the over­
discharge of the AD-209.
The selection of the AD- 209 and an external
DC
source is made by the external
DC
input con­
nector
®
.
15