SECTION 5
CALIBRATION
INTRODUCTION
A complete procedure for checking the operational stand
ards and calibration of the Type M Plug-In Unit is provided
in this section of the manual. The steps are arranged in
logical sequence to avoid unnecessary repetition.
When performing some steps in succession using a par
ticular setup (such as steps 11 through 14), you may prefer
to go through the four steps with the signal applied to
one channel. Using this method, you can turn the other
MODE switches to OFF while completing the steps. You
can then repeat the steps for each of the other channels.
This method reduces changing the signal connections as
often, the trace intensity is brighter, and the traces of the
other channels are not displayed. As familiarity with the
procedure and operation of the M Unit increases, such de
viations from the procedure in the manual may aid in
shortening the calibration time.
NOTE
C alibration steps may be performed out o f se
quence, or a single step may be performed
individually.
However, it may be necessary to
refer to the preceding step(s) a n d /o r prelim inary
procedure fo r a dditional setup inform ation, such
as the proper front-panel control settings, test
equipment required, and interconnecting cables
or leads required and their connections.
These step-by-step instructions furnish an orderly ap
proach for isolation of minor operational deficiencies
that may not be apparent during normal usage. Conse
quently, this procedure should be used in conjunction with
any maintenance and troubleshooting system to locate such
deficiencies. Obscure symptoms, if any, usually show up
when performing steps 1 through 14. The remaining steps
check and aid in restoring the M Unit to optimum fre
quency response and risetime.
If a minor malfunction becomes apparent at some point
in the procedure, it is not usually necessary to locate its
cause immediately before continuing to the next step. Addi
tional symptoms revealed by performing further steps will
frequently simplify the task of locating the trouble.
Test equipment used in a particular step should be left
connected at the end of that step unless instructions state
otherwise. Similarly, controls not mentioned are assumed
to be in positions they were in at the conclusion of the
preceding step.
EQUIPMENT REQUIRED
The following equipment is required to perform a com
plete calibration of the Type M Plug-In Unit.
(1) Oscilloscope, Tektronix Type 540-, 550-, or *580-
Series, or equivalent.
The oscilloscope must be
properly calibrated and have a vertical amplifier
risetime of 10 nsec or less. Oscilloscope control set
tings for a Type 541A Oscilloscope are listed in the
procedure; corresponding control settings should be
used if a different oscilloscope is used.
(2) Square-wave generator, Tektronix Type 105 or equiv
alent. Required specifications: 13-nsec or less rise
time; output frequencies of approximately 100 cps,
250 cps, lk c , 2.5 kc, and 10 kc; output amplitude
variable from 10 to 100 volts across a 600-ohm
internal load.
(3) Square-wave generator, Tektronix Type 107 or equiv
alent. Required specifications: 3-nsec or less rise
time; output frequency of approximately 450 kc; out
put amplitude variable from approximately 0.1 volt
to at least 0.2 volt when cable is terminated in 50
ohms.
(4) Volt-ohmmeter (VOM). Sensitivity of at least 5000
f l/ v at full deflection.
(5) 47-pf Input Time Constant Standardizer. (Tektronix
Part No. 011-0030-00 UHF or 011-0068-00 BNC.)
(6) Plug-In Extension. (Tektronix Part No. 013-0055-00).
(7) 50-ohm (nominal impedance) coaxial cable, 42 inches
long. (Tektronix Part No. 012-0001-00 UHF or 012-
0057-00 BNC.)
(8) Two 50-ohm cable terminations. (Tektronix Part No.
011-0045-00 UHF or 011-0049-00 BNC.)
(9) 50-ohm 5 X T attenuator. (Tektronix Part No. 011-
0032-00 UHF or 011-0060-00 BNC.)
(10) Tektronix Type P6006 Probe, or equivalent. Re
quired specifications are: bandpass, dc to 20 me; at
tenuation, 10X ; input capacitance, approximately
10 pf. (Tektronix Part No. 010-0125-00 UHF or 010-
0127-00 BNC.)
* Type 81 Plug-In Adapter required for use with Type 580-Series
oscilloscope.
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