Electrical Characteristics - Tektronix 1A4 Instruction Manual

Type 1A4
SECTION |!
CHARACTERISTICS
Introduction
The Tektronix Type 1A4 is a four-channel 50 MHz plug-in
unit designed to operate at maximum bandwidth in the Type
544, 546, 547 and 556 Oscilloscopes {including rackmounts}.
The unit provides four-channel operation for all 530-, 540-,
550- and 580'-series oscilloscopes. It can also be used in
conjunction with other oscilloscopes and devices through
the use of a Tektronix Type 127, 132, or 133 plug-in power
supply.
The Type 1A4 contains four identical fast-rise calibrated
preamplifier channels. Each channel has its own input selector,
attenuator, polarity and position controls which allows each
display to be adjusted for optimum viewing. Basic deflection
factor for each channel is 10 mV/cm.
The unique electronic switching logic of the Type 1A4 pro-
vides the versatility of two independent dual-trace units con-
nected to the inputs of a third dual-trace unit without sacrific-
ing bandwidth. For example, displays composed of channel
1 minus channel 2 can be chopped or alternated with channel
3 minus channel 4. As another example, the unit can be used
in a "double-added" mode (channels 1 and 2 added to chan-
nels 3 and 4).
ELECTRICAL CHARACTERISTICS
The following performance requirements (center column
data) apply over an ambient temperature range of 0°C to
+50° C after a warm-up time of 20 minutes.
Characteristic
Performance Requirement Supplemental Information
Deflection Factor
for each channel.
10 mV/cm to 20 V/cm in 11 calibrated steps | Steps in 1-2-5 sequence.
Deflection Accuracy
position.
Within -_3% of indicated deflection with | With gain correct at 10 mV/cm.
VARIABLE V/CM control in the CAL (detent)
Added Accuracy 1% with V/CM switch set to .01.
Variable Deflection Factor
Uncalibrated deflection factor at least 2.5
times the V/CM switch indication. This pro-
vides an uncalibrated deflection factor of at
least 50 V/cm in the 20 V/cm position.
Frequency Response (not more than
—-3 dB) using the Type 1A4 with
Tektronix oscilloscopes:
544, 546, 547 or 556 DC to 50 MHz
581, 581A, 585 or 585A
Adapter
DC to 50MHz with Type 81A Plug-In | DC to 33 MHz with Type 81 Plug-In Adapter
541, 541A, 543, 543A, 543B, 545, | DC to 33 MHz
545A, 545B or 555
549 DC to 30 MHz
551 DC to 27 MHz
531, 531A, 533, 533A, 535 or | DC to 15 MHz
535A
536 DC to 11 MHz
Risetime {calculated minimum) us-
ing the Type 1A4 with Tektronix
544, 546, 547 or 556 7 ns
35
Risetime = =———_,,
Frequency?
581, 581A, 585 or 585A 7ns with Type 81A Plug-In Adapter
11 ns with Type 81 Plug-in Adapter
541, 541A, 543, 543A, 543B, 545,
545A, 545B or 555 11 ns
1Type 81 or Type 81A Adapter is required.
*Oscilloscope/1A4 frequency at upper limit 3 dB down point.
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