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C H 3
: The channel-3 input signal is displayed
on the C R T .
C H 4
: The channel-4 input signal is displayed
on the C R T .
A D D
: A l g e b r a i c
channel-2 signals is displayed on the CRT.
If the C H 2 INV is selected, difference
of channel-1 and channel-2 signals is
displayed.
C H O P / A L T
: Pressing the s w i t c h turns on the LED
and selects chopping operation, which
displays channels alternately at approx.
5 0 0 kHz in the multi-trace mode. Chop-
ping is suitable for observation of slow
s w e e p time.
Another press of the switch turns off the
LED and selects A L T operation, which
displays channels alternately in the multi-
trace mode every time the trigger signal
is input. A L T operation is suitable for ob-
servation of fast sweep time.
N O T E : Chopping is not activated in the
single-trace mode. If multi-trace
chopping operation is changed
into the single-trace operation,
the C H O P L E D goes out.
lights up and chopping is acti-
vated
operation is selected again.
C H 2 INV
: Pressing the s w i t c h turns on the L E D
and inverts polarity of the channel-2
signal. Another press of the s w i t c h
turns off the L E D and restores the nor-
mal polarity.
2 0 MHz B W L : Pressing the s w i t c h turns on the LED
and limits the bandwidth to approx.
2 0 MHz. Another press of the s w i t c h
turns off the L E D and restores the
specified bandwidth.
10
Fig.
s u m
of
channel-1
and
It
w h e n
the
multi-trace
3
©
CH1 VARIABLE Control
Fine adjustment of the channel-1 axis vertical attenua-
tion for continuous variation between ranges selected
with the V O L T / D I V control. Full c l o c k w i s e rotation to
the C A L position calibrates the attenuator. Also serves
as a fine adjustment of the Y - a x i s attenuation in the X -
Y operation.
®
CH1 VOLTS/DIV Control
Channel-1 vertical axis attenuator for setting vertical
axis sensitivity from 1 mV/div. to 5 V/div. in 1-2-5 s e -
quence (from 1 0 mV/div. to 5 0 V/div. if the probe PC-31
compatible with the readout function is used). Setting
the C H 1 V A R I A B L E control © to the C A L position pro-
vides calibrated vertical axis sensitivity. Also serves a s
an attenuator of the Y - a x i s in the X - Y operation. For
the vertical axis sensitivity, confirm the R E A D O U T dis-
play on the C R T .
©
CH1 • POSITION Control
Adjusts vertical position of channel-1 waveform dis-
played on the C R T . A l s o used to adjust the Y - a x i s po-
sition in the X - Y operation.
©
C H I A C - D C Switch
Selects coupling of the channel-1 vertical axis input sig-
nal. Also serves as the Y - a x i s input selector in the X - Y
operation. Pressing the s w i t c h turns on the LED and
eliminates DC component from the input signal to make
A C input available ( A C coupling). Another press of the
s w i t c h turns off the L E D and make D C input available
(DC coupling), enabling signals w i t h D C components
to be observed.
N O T E : If the GND s w i t c h L E D © is on, input signal is
isolated from the vertical amplifier, and the ver-
tical amplifier input is grounded.
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