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difference between C H 1 and CH2 is displayed
(CH1 -
CH2).
5. When the signal voltage is more than 2 m V and
waveform fails to appear on the screen, the os-
cilloscope may be checked by feeding input
from
C A L 1 Vp-p (23).
voltage is 1 Vp-p, the waveform becomes 5 div
high at the 0.2/div position.
6. By pushing T R I G L E V E L (19). the free-running
auto function is released. The waveform dis-
appears when the knob is turned clockwise,
and appears again when it is returned to its ap-
proximate middle position of it. Sync phase is
also adjustable in this case. The waveform will
again disappear when the knob is turned
counterclockwise from the mid position.
7. W h e n
DC component
A C - G N D - D C (3) or (9) to DC position.
this case, the DC component contains plus
" + " potential, the waveform moves upward
and if it contains minus " — " potential, the
waveform moves downward.
The reference point of " 0 " potential can be
checked at G N D position.
POWER S U P P L Y
The oscilloscope is designed to operate on A C , in-
ternal battery or external DC.
A C operation
For A C operation, first set the power voltage selec-
tor switch to the voltage of your local A C current.
Then, connect the A C cord. The connection of the
A C cord automatically disconnects the internal
battery.
Operation on internal battery (option)
Install the battery pack in the oscilloscope accoring
to the following sequence (refer to the diagram on
the rear of the case):
* Open the package of the battery pack B P - 7 (op-
tion) and check to make sure that it contains two
6V lead batteries and connecting leads.
* Place the oscilloscope with the up side down,
remove the 4 screws on both sides using a
screwdriver. Hold the cord reel and pull it out.
The battery case cover will be removed.
* Release the lead from the cord clamper and then
remove the screw (4 x 4 0 mm) as shown in the
diagram.
* Connect the 2 batteries in series using the con-
necting leads, then connect the leads (red and
black) of the oscilloscope to the batteries. Make
8
Since
calibration
is m e a s u r e d , set
If, in
sure that the red lead is connected to " + " and
the black lead to " — " side.
* After the batteries have been connected, insert
the battery case from the rear and replace the
battery case cover. The battery leads should be
arranged on top of the batteries so that they are
not caught between the batteries and the battery
case.
* Tighten the 4 screws from each side of the case
and the screw (4 x 4 0 mm) from the rear of the
case.
Now, the oscilloscope is ready for operation. Refer
to the instructions in the previous paragraph "Con-
trols on Panels". With the internal battery, the os-
cilloscope can be operated for more than 2 hours,
although this depends on the condition of the
battery.
When the battery voltage falls down to 10V during
operation, the protection circuit is activated to shut
off the battery circuit. In this case, the power lamp
goes off indicating that the battery is protected
against over-discharge. When this happens, the
battery should be recharged fully and immediately,
(refer to item "Battery Charging")
The power lamp will start blinking to indicate
battery voltage drop 10 minutes before the protec-
tion circuit operates.
Operation on external D C (11 ~ 15.5V)
Connect a DC power cord from DC 12V receptacle
(31) to a nominal 12volt DC power source (11 to
15.5 V D C ) , such a s a vehicle cigarette lighter.
Observe
proper
polarity;
protected against reverse polarity damage, but will
not operate if polarity is reversed.
Turn on P O W E R / I N T E N control (14).
P O W E R indicator (12) should glow, and the scope
is ready for use.
If C H A R G E indicator (13) glows, the batteries are
charging the indicator goes off w h e n the batteries
are fully charged.
BATTERY C H A R G I N G
To charge the internal battery, connect the A C line
cord to
A C outlet.
regardless of the position of the power switch.
When battery charge is started, the C H A R G E lamp
will light. With the power switch set to OFF, the
battery is fully charged in about 16 hours. With the
switch set to ON, the battery is charged in about
2 8 hours; the oscilloscope can be used while the
battery is being charged. The external power con-
the
oscilloscope
T h e battery
is charged
is
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