Tektronix 323, Инструкция по эксплуатации

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Calibration— Type 323
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39. Adjust External Horizontal Variable Page 6-23
Balance (R218)
No trace shift as EXT HORIZ VAR control is ro­
tated throughout its range.
40. Check External Horizontal Deflection Page 6-23
Factor
200 to 300 millivolts/division.
41. Check External Horizontal Deflection Page 6-24
Factor with 10X Attenuation
Two to three volts/division.
42. Check External Horizontal Var- Page 6-24
iable Control Range
10:1 range or greater.
43. Check External Horizontal Coupling Page 6-24
Correct signal coupling in the EXT TRIG OR HORIZ
positions of the Trig/Horiz Coupling switch.
44. Check External Horizontal Bandwidth Page 6-24
Not more than —3 dB at 10 kilohertz.
45. Check External Blanking Page 6-24
Five-volt positive peak signal blanks trace.
46. Check Internal Triggering Operation Page 6-25
Stable display in INT TRIG AC and ACLF REJ
positions of the Trig/Horiz Coupling switch with the
TRIGGER control set to -+- AUTO, variable positive-
slope area, variable negative-slope area and
AUTO; check with 0.3-division display at 400
kilohertz and a 0.75-division display at four mega­
hertz.
47. Check External Triggering Operation Page 6-26
Stable display in EXT TRIG OR HORIZ AC and DC
positions of the Trig/Horiz Coupling switch with the
TRIGGER control set to + AUTO, variable positive-
slope area, variable negative-slope area and —
AUTO; check with a 75-millivolt signal at 400
kilohertz and a 190-millivolt signal at four mega­
hertz.
48. Check Low-Frequency Triggering Page 6-26
Operation
External, stable display in EXT TRIG OR HORIZ
AC and DC positions of the Trig/Horiz Coupling
switch with the TRIGGER control set to - f AUTO,
variable positive-slope area, negative-slope area
and — AUTO; check with 75-millivolt signal at 30
hertz. Internal, stable display in INT TRIG OR
HORIZ AC positions of the Trig/Horiz Coupling
switch with the TRIGGER control set to - f AUTO,
variable positive-slope area, variable negative-slope
area and — AUTO; check with a 0.3-division dis­
play at 30 hertz.
49. Check Low-Frequency Reject Page 6-27
Operation
Stable display with 0.3-division display at 30 kilo­
hertz with the TRIGGER control set to -f- and —
AUTO and in the variable positive- and negative-
slope areas; stable display cannot be obtained
at 30 hertz.
50. Check Trigger Slope Operation Page 6-27
Stable triggering on correct slope of trigger sig­
nal in the
AUTO, variable positive-slope area,
variable negative-slope area and — AUTO posi­
tions of the TRIGGER control.
F I 51. Check TRIGGER Control Range Page 6-27
EXT TRIG OR HORIZ ATTEN switch set to I X , at
least + and - 0 .8 volts,- EXT TRIG OR HORIZ
ATTEN switch set to 1 0 X , at least -f- and — 8
volts.
0 52. Check Calibrator Risetime Page 6-28
Two microseconds or less.
1 | 53. Check Calibrator Repetition Rate Page 6-28
750 hertz, ± 2 5 0 hertz.
n 54. Check Calibrator Duty Cycle Page 6-28
40% to 60%.
CALIBRATION PROCEDURE
General
The following procedure is arranged in a sequence which
allows the Type 323 to be calibrated with the least inter
action of adjustments and reconnection of equipment The
steps in which adjustments are made are identified by the
symbol O following the title. Whenever possible, instrument
performance is checked in the "CHECK" part of the step be­
fore an adjustment is made. The "ADJUST" part of the
step identifies the point where the actual adjustment is
made. Steps listed in the "INTERACTION" part of the step
may be affected by the adjustment just performed. This is
particularly helpful when only a partial calibration procedure
is performed.
NOTE
To prevent recalibration o f other parts of the in ­
strument when perform ing a p artial calibration,
readjust only if the tolerances given in the CHECK
part o f the step are not met. However, when per­
form ing a complete calibration, best overall per­
formance is obtained if each adjustment is made
to the exact setting even if the CHECK is w ithin
the a llo w a b le tolerance.
In the following procedure, a test-equipment setup picture
is shown for each major group of checks and adjustments.
Beneath this setup picture is a complete list of front-panel
control settings for the Type 323. To aid in locating individ­
ual controls which have been changed for the new setup,
these control names are printed in bold type. Each step con­
tinues from the equipment setup and control settings used
in the preceding step(s) unless noted otherwise. If only a
partial calibration is performed, start with the test equip­
ment setup preceding the desired portion. External controls
or adjustments of the Type 323 referred to in this procedure
are capitalized (e.g., VOLTS/DIV). Infernal adjustment names
are initial capitalized only (e.g., Limit Centering).
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