SECTION 1
TYPE 422 SPECIFICATION
W ith AC-DC Power Supply
Change information, if any, affecting this section will be found at the rear of this manual.
Introduction
The Tektronix Type 422 Oscilloscope is a solid-state
portable instrument that combines small size and light
weight with the ability to make precision waveform meas
urements. The instrument is mechanically designed to with
stand the shock, vibration and other extremes of environ
ment associated with portability. The dual-channel DC-to-
15 megahertz vertical system provides calibrated deflection
factors from 0.01 to 20 volts/division. A X I0 gain feature
in Channel 2 allows each Channel 2 deflection factor to be
increased 10 times and provides a minimum deflection
factor for Channel 2 of 0.001 volt/division in the 0.01 posi
tion (AC-coupled with reduced frequency response). The
trigger circuits provide stable triggering over the full range
of vertical frequency response. The horizontal deflection
system provides calibrated sweep rates from 0.5 second to
0.5 microsecond/division. A X I0 horizontal magnifier
allows each sweep rate to be increased 10 times and pro
vides a maximum sweep rate of 0.05 microsecond/division
in the 0.5 jus position. X-Y measurements can be made by
applying the vertical (Y) signal to either the INPUT 1 or
INPUT 2 connector and the horizontal (X) signal to the
HORIZ IN OR TRIG IN connector (TIME/DIV switch set
to EXT HORIZ).
The Type 422 with AC-DC Power Supply can be op
erated from any one of three power sources; AC line, exter
nal DC, or internal rechargeable batteries. The regulated
low-voltage power supply assures that instrument perform
ance is not affected by variations in internal battery charge
level, applied DC voltage, or AC line voltage and frequency.
Maximum total power consumption is 26 watts for external
DC operation and 30 watts for AC operation. The instru
ment will operate about four hours from the internal bat
teries when fully charged.
This instrument will meet the electrical characteristics
listed in Table 1-1 following complete calibration as given
in Section 5. The performance check procedure given in
Section 5 provides a convenient method of checking instru
ment performance without making internal checks or
adjustments. The following electrical characteristics apply
over a calibration interval of 1000 hours and an ambient
temperature range of —15° C to +55° C, except as other
wise indicated. Warmup time for given accuracy is 20
minutes.
TABLE 1-1
ELECTRICAL
Characteristic
Performance
VERTICAL DEFLECTION SYSTEM
Deflection Factor
Channel 1 or 2 cali
brated range, XI
gain
Without probe
10 millivolts/division to 20 volts/
division in 11 steps. Steps in 1-2-
5 sequence.
With P6012 Probe
100 millivolts/division to 200
volts/division in 11 steps. Steps
in 1-2-5 sequence.
Channel 2 only cali
brated range, X I0
gain
Without probe
One millivolt/division to two
volts/division in 11 steps. Steps
in 1 -2-5 sequence.
Characteristic
Performance
With P6012 Probe
10 m illivolts/division to 20
volts/division in 11 steps. Steps
in 1-2-5 sequence.
Channel 1 or 2 accu
racy, X I gain
With or without
probe
Within 3% of indicated deflec
tion.
Channel 2 only "accu
racy, X10 gain
With or without
probe
+20° C to +30°
C
—15° C to +55°
C
Within 4% of
indicated de
flection.
Within 7.5% of
indicated de
flection.
Uncalibrated (variable)
range
Continuously variable between
calibrated deflection factor
settings. Extends maximum un
calibrated deflection factor to at
least 50 volts/division.
1-1
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