Tektronix 067-0521-00, Инструкция по эксплуатации

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SECTION
I
CHARACTERISTICS
General Description
The
067-0521-00
Plug-In Test Unit is a versatile single-unit
calibration aid for use with all Tektronix 530-, 540-, or 550-
Series Oscilloscopes using 1-series or letter-series vertical
plug-in units. The 067-0521-00 is the only plug-in unit re­
quired for calibrating the oscilloscope.* An input connector
on the front panel permits application of various external
signals for use in the calibration procedure. The self-con­
tained unit also generates fast-rise pulses for checking rise­
time and adjusting transient response of the oscilloscope
vertical amplifier.
The 067-0521-00 permits checking the regulation limits of
the power supplies. In addition, the unit provides a quick
check of the oscilloscope alternate sync pulse and chopped
blanking circuitry. For oscilloscopes capable of displaying
two time-base signals alternately, the 067-0521-00 checks the
ability of the alternate-sweep switching circuitry to lock
the channels of a dual-trace plug-in unit to the time bases
of the oscilloscope.
ELECTRICAL
TEST FUNCTION SWITCH POSITIONS
LOW LOAD, HIGH LOAD
These two switch positions permit the oscilloscope low-
voltage power supplies to be loaded from minimum to
maximum. External signals applied through the EXT INPUT
connector on the front panel of the unit w ill be ac-coupled
to the oscilloscope vertical amplifier to produce a normal
display. Maximum vertical sensitivity of the 067-0521-00
oscilloscope combination is about 0.5volt/cm when the
VARIABLE control is set fully clockwise.
G A IN SET
Permits setting the gain of the oscilloscope vertical ampli­
fier with a 100-volt calibrator signal applied to the EXT
INPUT connector. The 250-to-1 fixed ratio of this position
attenuates the 100-volt signal to 0.4 volt which produces
4 cm of vertical deflection on the crt when the oscilloscope
vertical am plifier gain adjustment has been accurately set.
C O M M O N MODE
Checks common-mode rejection ratio and dc balance of
the oscilloscope vertical amplifier.
ALTERNATE
Checks operation of the alternate-mode synchronizing
circuits in the oscilloscope. Also permits checking for proper
sweep slaving in oscilloscopes having two time bases that
can be displayed alternately. Any external signal applied
* A sine-wave bandpass check of the system cannot be made by
applying an external high-frequency sine wave through the plug-in
test unit.
to the EXT INPUT connector is attenuated approxim ately
1000 times by an internal attenuation network.
CHOPPED
Checks oscilloscope for proper operation in the chopped
mode. Free-running rate of the dual-trace switching multi­
vibrator is approximately lOOkc. Any external signal ap­
plied to the EXT INPUT connector is attenuated approxi­
mately 1000 times by the internal attenuation network.
+ PULSE, -P U LS E
In these two switch positions, a fast-rise square wave with
a risetime considerably less than the vertical deflection sys­
tem risetime of a Type 546 or Type 547 Oscilloscope is
applied to the vertical-deflection system of the oscilloscope
being adjusted. The amplitude of either a + or — pulse dis­
play can be varied between approximately 2 cm and 6 cm.
Other Controls
and Connectors
REPETITION RATE
Three-position switch to select the approximate pulse
repetition rate of the Pulse Generator circuit: LQW —
5 kc, MED - lOOkc, HIGH - 600 kc.
AMPLITUDE
Adjusts amplitude o f the pulse applied to the oscilloscope
vertical amplifier when the TEST FUNCTION switch is set
to + PULSE or — PULSE.
VARIABLE
Controls amplitude of the signal applied through the
EXT INPUT connector when the TEST FUNCTION switch is
set to LOW LOAD or HIGH LOAD. The minimum deflec­
tion factor is 0 .5volt/cm with the VARIABLE control set
fully clockwise.
VERTICAL POSITION
Controls vertical positioning of the trace or display on
the crt in all TEST FUNCTION positions except C O M M O N
MODE.
+ 2 2 5 V Pushbutton
Provides +225 volts at the front-panel output banana jack
when the pushbutton is pressed.
+ 22 5 V Banana Jack
Convenient source of +2 2 5 volts for checking dc balance
of each stage of a distributed vertical amplifier. W ith the
voltage output connected to the cathodes, the stage is
effectively cut off when the + 2 2 5 V pushbutton is pressed.
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