Tektronix 1A2 Instruction Manual page 5

SECTION I
CHARACTERISTICS
Introduction
The Type 1A2 Dual-Trace Plug-In Unit contains two identi-
cal fast-rise calibrated preamplifier channels. Either chan-
nel can be used independently, or electronically switched to
produce dual-trace displays. In addition, both channels can
be combined at the output, adding or subtracting according
to the settings of the polarity switches.
Each channel has its own input coupling, attenuator, gain,
polarity and position controls which allows each display to
be adjusted independently for optimum viewing.
There are two modes of dual-trace operation: Chopped
or Alternate. In the chopped mode, an internal multivibra-
tor switches the channels at a free-running rate of about
220 kHz. In the alternate mode, the oscilloscope time-base
generator internally switches the channels at the end of each
sweep during the retrace interval.
The Type 1A2 can be used with any of the Tektronix 530-,
540-, or 550-series Oscilloscopes. It can also be used with
the 580-series Oscilloscopes in conjunction with the Type 81
or 81A Plug-In Adapter. The Type 1A2 can also be used with
other oscilloscopes and devices through the use of the Type
127, 132, or 133 Plug-In Power Supplies.
CALIBRATED PREAMPLIFIER
Characteristic Performance Requirement
Supplemental Information
Deflection Factor
.05 volts/cm to 20 volts/em in 9 calibrated
steps for each channel
Steps in 1-2-5 sequence
Deflection Accuracy Within =&3% of indicated deflection with
VARIABLE control fully clockwise
With gain correct at .05 V/cm
Variable Deflection Factor
Uncalibrated deflection factor at least 2.5
times the VOLTS/CM switch indication. This
permits continuous (uncalibrated) adjustment
from 0.05 volts/em to at least 50 volts/cm.
Frequency Response (not more
than 3dB down): Type 1A2
with Tektronix oscilloscope;
544, 546, or 547 DC to 50 MHz
581, 581A, 585, 585A DC to 50 MHz with Type 81A Plug-In Adapter
DC to 33 MHz with Type 81 Plug-in Adapt-
er
541, 541A, 543, 543A, 545, | DC to 33 MHz
545A, 545B, or 555
551 DC to 27 MHz
531, 531A, 533, 533A, 535, | DC to 15 MHz
or 535A
536 DC to 11 MHz
Risetime: Type 1A2 with Tek-
tronix oscilloscopes;
544, 546, or 547 7 ns
'581, 581A, 585, 585A
7 ns with Type 81A Plug-In Adapter 11 ns with Type 81 Plug-in Adapter
541, 541A, 543, 543A, 545. | 11 ns
545A, 545B, or 555
551 13 ns
531, 531A, 533, 533A, 535, | 24 ns
or 535A
536 32 ns
Input RC Characteristics
Typically 1 MQ parallel with approximately
15 pF
Maximum Input Voltage
600 volts combined DC and peak AC; 600
volts peak-to-peak AC
Input Coupling Modes
AC or DC, selected by front-panel switch
GND, disconnects
amplifier input
signal and grounds
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