Tektronix 442, Instruction Manual

Page: 10 / 170

Section 1—442 Service
SPECIFICATION
This manual contains a specification, operating in­
structions, and service information pertaining to the
TEKTRONIX 442 Oscilloscope. The 442 is a portable,
35 MHz, dual trace instrument withachoiceof alternateor
chop sweep presentation on a single time base. The
Vertical Amplifier provides calibrated deflection factors
from 2 mV to 10 V/div. The Time Base provides stable
triggering over the full bandwidth of the Vertical Amplifier
and provides calibrated sweep rates from 0.5 s/div to
0.1 yus/div. A X I0 magnifier switch extends the fastest
sweep rate to 10 ns/div.
The following instrument specification applies over an
ambient temperature range of -15° to +55°C for in­
struments that have been calibrated at an ambient
temperature b20° C and +30° C unless otherwise
i ndi cated when the i nstrument has had a warm up peri od of
about 20 minutes. The adjustment procedure in Section 4,
when performed completely, allows the 442 to meet the
electrical specification listed in Table 1-1.
Table 1-1
ELECTRICAL CHARACTERISTICS
Characteristics
Performance Requirements Supplemental Information
VERTICAL SYSTEM
Deflection Factor
Calibrated Range 2 mV to 10 V/div; 12 steps,
in a 1-2-5 sequence.
Accuracy
+20° C to +30° C Within 3%.
Gain adjusted with VOLTS/DIV
switch set to 2 m.
—15°C to +55° C
Within 4%.
Uncalibrated (VAR)
Range
Continuously variable between
settings. Increases deflection factor
by approximately 2.5:1.
Extends maximum deflection factor
to at least 25 V/div.
Frequency Response
Bandwidth
2 m to 1 V Dc to at least 35 MHz.
5-division reference signal
centered vertically from a
25 O sourse with VOLTS/DIV
VAR control in calibrated detent.
2 V, 5 V, & 10 V Dc to at least 25 MHz.
Chopped Mode Repetition Rate
Approximately 250 kHz.
Input Resistance Approximately 1 MQ.
Input Capacitance Approximately 30 pF.
Maximum Input Voltage 400 V (dc + peak ac).
800 V p-p ac at 1 kHz or less.
REV A MAY 1980
1-1