Horizontal Checks; Calibration Procedure; Preliminary Procedure - Tektronix 1S1 Instruction Manual

Horizontal Checks

36. Check Timing and Linearity (Page 5-49)
Correct timing within 1% at 5 µsec;
Correct 1-2-5 ratio within 1% on 5 µS ramp;
Correct timing within 1% using magnifiers (from .5
µSec);
Correct timing within 1% on each time position range
(using "multiple of 5'' sweep rate);
Correct timing within 3% at each end of time position
range, excluding the following: first 2% of fast ramp
on 500µS, 50µS, 5µS and 500nS ranges: first 4% of
fast ramp on 50 nS range;
Timing linearity within 1% over time position range;
(Optional): Correct timing within 3% on all sweep rates
from 50µsec/cm to 0.1 nsec/cm.
37. Check Time/Cm Variable (Page 5-52)
3:1 increase in equivalent sweep speed.
38. Check Single Sweep (Page 5-52)
Triggered single sweep operation.
39. Check Samples/Cm (Page 5-52)
4 to 6 dots/cm with SAMPLES/CM control at minimum;
1 to 30sec/sweep
maximum;
Nearly imperceptible dot movement with SAMPLES/CM
control at SWEEP OFF position.
40. Check Blanking (Page 5-53)
1.5µsec blanking between dots;
Retrace positioned off screen.
41. Check Ext Atten and Manual Scan (Page 5-55)
1 volt/cm (±4%) with EXT HORIZ ATTEN control clock-
wise;
16 volts/cm with EXT HORIZ ATTEN control counter-
clockwise;
10.0cm of scan with MANUAL SCAN control.
42. Check Display Jitter (Page 5-57)
0.02% of time position ramp on 500µS, 50µS and 5
µS ranges;
0.024% of time position ramp on 500 nS range;
0.08% of time position ramp on 50 nS range.
Triggering Checks
43. Check Triggering Jitter (Page 5-57)
0.7µsec on 100-kc sine wave, 50mv internal;
0.5µsec on 100-kc sine wave, 4mv external;
5nsec on 10-Mc sine -wave, 50mv internal, 8mv
external;
200psec on 1-Gc sine wave, 50mv internal, 8mv
external;
200 psec on 2-nsec pulse, 40 mv internal, 7 mv ex-
ternal.
44. Check External Trigger Kickout (Page 5-60)
25 mv with TRIGGER SOURCE switch at EXT ±
45. Check Trigger Recovery Time (Page 5-60)
1.8-2.3 msec on 500µS time position range;
200-270 µsec on 50µS time position range;
20-27 usec on 5uS time position range;
10-13 µsec on 500 nS and 50 nS time position ranges.
with SAMPLES/CM control

CALIBRATION PROCEDURE

The following procedure is arranged in a sequence that
allows the Type 1S1 to be calibrated with a minimum of
adjustment interaction. Each step contains complete in-
formation for performing that step. The sequence includes
procedures for checking performance as well as those re-
quired for adjusting the calibration controls. To make only
the control adjustments without checking performance of
the instrument, perform only the "Adjust'' steps and omit
the "Check" steps. (The symbol
venience in locating the "Adjust" steps.) Any equipment
connections or control settings that are changed during
the omitted steps must be noted and performed if neces-
sary. If any adjustment steps are performed individually
or out of sequence, subsequent adjustment steps may also
need to be checked, since some adjustments affect the cali-
bration of other circuits.
To identify the two oscilloscopes used in the procedure,
the one that is operated in conjunction with the Type 1S1
is called the "indicator oscilloscope" and the one that is
used for making waveform and voltage checks is referred
to as the "test oscilloscope.''
at
Use a short ground lead on the test probe. Whenever
the probe is connected to a test point, clip the ground lead
to chassis ground. Failure to ground the probe cable may
result in the appearance of ringing on the signal.
Do not preset any calibration adjustments unless they
are known to be significantly out of adjustment or unless
repairs have been made in the circuit. In these cases, set
the particular controls to midrange.
Readjust the indicator oscilloscope Intensity control as
needed during the procedure to provide an adequate dis-
play that is not excessively bright. This is especially im-
portant when a stationary spot or very slow trace is being
displayed. A stationary spot can damage the crt screen
if the intensity is too great.
An initial test equipment setup picture is shown for each
major group of adjustments and checks. Beneath each
setup picture is a complete list of front-panel control set-
tings of the Type 1S1, plus significant control settings of
other instruments. Any control that has been changed from
the setting at the end of the previous step is given in bold-
face type. Throughout the procedure, except where noted
otherwise, the TIME/CM (MAGNIFIER) knob is locked to
the TIME POSITION RANGE switch.

Preliminary Procedure

1. Remove the left side panel of the indicator oscillo-
scope.
2. Connect the power cord of the indicator oscilloscope
to the output of the autotransformer.
3. Place the Type 1S1 upside-down in front of the indi-
cator oscilloscope.
4. Connect the interconnecting plug of the Type 1S1 to
the indicator oscilloscope through the 30-inch flexible ex-
tension cable (see Fig. 5-3).
5. Connect the autotransformer and the other test in-
struments to the power line.
Calibration – Type 1S1
is provided for con-
5-5