Tektronix 545A Instruction Manual page 5

General nformation
The Tektronix Type 545A Oscilloscopes are wide-range
general-purpose laboratory instruments.
provides accurate measurements in the d c to 30 m c range.
The instrument can be operated with any Tektronix letter ­
series plug-in unit to satisfy the requirements for virtually
any application.
pecial circuits incorporated in the Type 545A Oscilloscope
permit an accurate, continuously variable delay in the
presentation of the sweep from 1 microsecond to 10 sec ­
onds after receipt of a triggering impulse.
permits observation of a small portion of the normal sweep,
accurate measurement of waveform jitter, precise time mea ­
surements, as well as many other uses.
Vertical-Deflection System
All specifications for the Vertical-Deflection
Type 545A Oscilloscope depend upon the plug-in unit used
with the instrument. The following specifications are given
assuming that a Type K Plug-In Unit is used.
Type 545A:
Bandpass DC to 30 m c (3 db down at 30 m c )
± ' / 2 db.
Risetime 0.012 microseconds
Triggering Modes
Time Base A — Automatic, AC, DC, AC Low Frequency Re ­
ject, and High Frequency ync.
Time Base B — Automatic, AC, and DC.
Triggering Signal Requirements
Internal triggering — a signal producing 2 millimeters of
vertical deflection.
External triggering — a signal of 0.2 volts to 10 volts.
weep will trigger on larger signals, but TRIGGERING LEVEL
control operates over a ±10 volt range.
High Frequency ync. — Assures a stable display of sine wave
signals to approximately 30 m c . Requires a signal producing
2 centimeters of vertical deflection or an external signal of
more than 2 volts.
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CHARACTER ST CS
Sweep Rates
Time Base A — 0.1 microseconds to 5 seconds per centimeter
in 24 accurately calibrated steps. An uncalibrated control
The Type 545A
permits sweep rates to be varied continuously between 0.1
microseconds and approximately 1 2 seconds per centimter.
Calibrated sweep rates are typically within 1%, and in all
cases within 3%, of the indicated sweep rate.
Time Base B — 2 microseconds to 1 second per centimeter in
18 accurately calibrated steps.
within 1%, and in all cases within 3%, of the indicated
This feature
sweep rate.
Magnifier
Provides a 5-times magnification of the center 2-centimeter
portion of the oscilloscope display. Extends the fastest Time
Base A sweep rate to 0.02 microseconds per centimeter and
the fastest Time Base B sweep rate to 0.4 microseconds per
ystem of the
centimeter.
External Horizontal nput
Deflection factor — approximately 0.2 to 15 volts per centi ­
meter, continuously variable.
Frequency response — from d c to 240 kc.
3 db at 240 kc.
multiplier is on XI.
Horizontal input connector characteristics — 1 megohm paral ­
leled by approximately 47 μμf.
Delayed Sweep
weep delay continuously variable from 1 microsecond to
10 seconds. Actual delay steps (between 1.00 and 10.00)
are within 1% of the indicated delay from 2 /zsec/cm to
0.1 sec/cm; within 3% from 0.2 sec/cm to 1 sec/cm. Incre ­
mental delay accuracy is within 0.2%.
Time jitter — 1 part in 20,000.
Cathode-Ray Tube
Type 545A Oscilloscope — Type T543P2.
Phosphors — Type P2 phosphor normally supplied; P 1 , P7, and
P 1 1 phosphors optional. Other phosphors available on spe ­
cial order.
Unblanking — d c coupled.
O S
weep rates are typically
Response down
When variable control is full right and
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