Model
192C
Performance
Check
SECTION V
PERFORMANCE CHECK AND ADJUSTMENTS
5-1.
INTRODUCTION.
5-2.
Thissection provides a performance check procedure
to determine if the
Model 182C is operating within
specifications
and a i»'ocedure
for adjustment
and
cal-
ibration. Physical location of the adjustments is shown in
the
fold'Out photograph at the end of this section.
5-3.
TEST EQUIPMENT.
5-4.
Recommended test equipment is listed in Table
5-1.
Test equipment having the required
characteristics may
be substituted. Use recently calibrated equipment to
ensure proper
results.
5-5. PERFORMANCE CHECK.
5-6. The purpose of the performance check is to deter-
mine
if
the instrument is operating
within the
spec-
ifications listed
in
Table
1-1.
This check may also be
used as
part
of
an incoming quality assurance inspection,
as a periodic operational check or to
verify operation
after
repairs or adjustments have been made.
5-7. It
is
desirable
to do
the performance check
in
the
sequence given since succeeding steps depend on control
settings and results of previous steps. If desired, the
checks may be accomplished individually by
referring
to
the preliminary control settings and the preceding steps
5-8.
A
Performance
Check Record is included at
the
end
of these checks. As the initial performance check is
accomplished,
the actual readings should be
entered
on
the
form.
The form may
be
removed
from
the manual
and filed for future reference. Readings taken
at a
later
date
can
be
compared with the original performance check
results.
5-9. PRELIMINARY SETUP.
5-10. Set the line voltage SELECTOR switch, located on
rear panel, to desired power line operating voltage
(115\/ or 230V ac). Connect instrument to line power
source and apply power
by
turning LINE power switch
ON. Allow fifteen minutes for warm-up. Do not install
plug-ins.
5-11.
CALIBRATOR CHECK,
a.
Set controls
as
follows;
MAGNIFIER X10
DISPLAY EXT
EXT COUPLING AC
b. Connect a lOV
p p
signal
from Voltmeter
Cal
ibrotortoEXT INPUT.
c.
Obtain a horizontal trace by adjusting INTENSITY,
FOCUS and POSITION controls.
d. Adjust EXT
VERNIER
to
obtain displayed trace of
exactly lOdivisions.
e.
Disconnect Voltmeter Calibrator from EXT INPUT.
Do
not disturb EXT VERNIER setting.
f. ConneCT CALIBRATOR 10V output to
EXT
INPUT.
g.
Note
displayed trace of
10
tO.1 divisions.
h. Disconnect
CALIBRATOR 10V output
from
EXT
INPUT.
j Observe CALIRRATOR 10V output ustng Monitor
Oscilloscope.
j.
Risetime
of calibrator waveform (leading
edge)
should
be
3
fzsec
or less. Risetime is measured at 10%
to 90%
amplitude points.
k. Disconnect CALIBRATOR from EXT INPUT.
5-12. HORIZONTAL MAGNIFIER CHECK.
a. Set
controls
as
follows.
MAGNIFIER XI
DISPLAY EXT
EXT VERNIER CAL
b. Connect 10V p-p signal
from
Voltmeter Calibrator
output to EXT INPUT.
c. Note
displayed trace of 10 ±0.5 divisions.
d. Set Voltmeter Calibrator for output
of
IV
p p
e.
Set MAGNIFIER ToXIO.
f. Note displayed trace of 10 ±0.5 divisions.
5
13. HORIZONTAL BANDWIDTH CHECK.
a. Connect 50 kHz signal
from
Constant Amplitude
Signal Generator to EXT INPUT.
b. Set MAGNIFIER to XI.
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