Tektronix CA PLUG-IN, Instruction Manual

Page: 17 / 48

ON 5
INTRODUCTION
Information contained in this section is
provided as an aid to recalibrating andchecking
the Operation of the Type CA Plug-In Unit. In
addition, this section may be used to isolate
troubles occuring within the unit.
Apparent troubles in the unit are often the
result of improper calibration of one or more
circuits.
Consequently, calibration checks
should be an integral part of the troubleshoot-
ing procedure. Abnormal indications occuring
during calibration checks w ill often
aid in
isolating troubles to a definite Circuit or stage.
In the instructions that follo w > the Steps
are arranged in the proper sequence fo r a
complete recalibration of the instrument. Each
numbered Step contains the information required
to make one check , one adjustment, or a series
o f related adjustments or checks. The Steps
are arranged so that unnecessary repetition
o f certain checks is avoided.
In each calibration Step only the required
information is given. Detailed instructions per -
taining to normal Operation of the instrument
are not included. If you are in doubt as to
the proper Operation of Controls, re fe r to
the Operating Instructions.
Controls not mentioned in a particular cal­
ibration Step are assumed to be in the positions
they were in during the previous Step. All
test equipment used in any particular Step
should be disconnected at the end of the Step
unless you are instructed to the contrary.
If a single control requires adjustment, it
can be adjusted in the applicable Step of this
procedure without perform ing other Steps as
well. It w ill be necessary, however, that you
r e fe r to the calibration steps immediately pre-
C A L IB R A T IO N
P R O C E D U R E
ceding the adjustment you wish to make to
determine the proper settings fo r the Controls
not mentioned in that step.
If you suspect that the unit is out of ca l­
ibration but you are not aware of which par­
ticular adjustment w ill correct the difficulty,
it is
usually best to run through the entire
calibration procedure. In this way you can
be certain that the unit is properly calibrated
without
resorting to a method of random
experimentation.
EQUIPMENT REQUIRED
The following equipment or its equivalent
is required to perform a complete calibration
o f the Type CA Plug-In Unit.
1. Tektronix 540-Series convertible oscillo-
scope or equivalent.
2. DC
Voltmeter with sensitivity
of
at least
20,000-ohms per volt.
3. Ohmmeter.
4. Type 190 or 190A constant-Amplitude Signal
Generator or equivalent, providing constant
amplitude sine waves from about 50 kc to
30 mc with output amplitude constant within
+ o r -
2%.
5. Type 105 Square-Wave Generator or equiva­
lent with frequency ränge of about 25 cycles
to 1 m c, risetim e at least .02 microseconds
and frequency indication accuracy of no
poorer than + o r -
3%.
6. Type 107 Square-Wave Generator or equiva­
lent with frequency ränge of 400 kc to 1 m c,
peak-to-peak output voltage of at least 0.1
to .5 völts, and risetim e of 3 nanoseconds
or less.
AA
Calibration - Type CA
5-1