Operating Instructions—Type 422 AC-DC
VARIABLE
UNCAL
HORIZ ATTEN
(LEVEL)
HORIZ IN
(TRIG IN)
Power and External
POWER
EXT BLANK
ING
Rear-Panel
Power Mode
(see Fig. 2-2)
Provides uncalibrated sweep rates be
tween the calibrated settings selected
by the TIME/DIV switch. The sweep
rate in each TIME/DIV switch position
can be reduced to at least the sweep
rate of the next adjacent position to
provide continuously variable sweep
rates from 0.05 microsecond/division
(X I0 MAG switch pulled out) to 1.25
seconds/division.
L ig h t indicates that VARIABLE
TIME/DIV control is not in the CAL
position.
Provides approximately 10:1 attenua
tion for external horizontal signals
connected to the HORIZ IN connector
when the TIME/DIV switch is set to
EXT HORIZ.
Input connector for external hor
izontal signal when TIME/DIV switch
is set to EXT HORIZ.
nal DC source. Indicator operable
but no charging is provided for bat
tery pack.
OPERATE INT BATT: Provides in
strument operation from internal
battery pack. Indicator operable
but battery pack cannot be charged
in this switch position.
OPERATE 115V AC: Provides
instru m ent operation from a
115-volt nominal AC line voltage
source. Indicator operable and a 30
milliampere trickle charge is applied
to battery pack.
CHARGE BATT 115V AC: Used
when AC line voltage applied to in
strument is 115 volts nominal.
Charges internal battery pack at a
400 milliampere rate when POWER
switch is on. Indicator does not
operate in this switch position.
Blanking
Light: Indicates that POWER switch
is on and power is available. For the
OPERATE INT BATT position of
the Power Mode switch, the
POWER light blinks to indicate that
the batteries are discharged too far
for continued operation.
Switch: Push-pull switch to control
power to the instrument.
FIRST-TIME OPERATION
General
The following steps demonstrate the use of the controls
and connectors of the Type 422. It is recommended that
this procedure be followed completely for familiarization
with this instrument.
Setup Information
1. Set the front-panel controls as follows:
Input connector for external blanking
signals.
Selects the operating power mode.
CHARGE BATT 230 V AC: Used
when AC line voltage applied to in
strument is 230 volts nominal.
Charges internal battery pack at a
400 milliampere rate when POWER
switch is on. Indicator does not
operate in this switch position.
OPERATE 230V AC: Provides instru
ment operation from a 230-volt
nominal AC line voltage source. In
dicator operable and a 30 m illi
ampere trickle charge is applied to
battery pack.
OPERATE 11.5-35 V DC: Provides
instrument operating from an exter-
Vertical controls (both channels where applicable)
VOLTS/DIV
VARIABLE
Input Coupling
POSITION
Mode
INVERT
X I0 GAIN AC
Triggering Controls
Source
Coupling
SLOPE
Mode
LEVEL
Horizontal controls
POSITION
TIME/DIV
VARIABLE
X I0 MAG
CALIBRATE 4 DIV
CAL
GND
Midrange
CH 1
Pushed in
Pushed in
CH 1 and 2
AC
Positive going (J~)
AUTO
Midrange
Midrange
.5 mSEC
CAL
Pushed in
j
2-10
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