Tektronix 535A, Instruction Manual

Page: 64 / 156

Calibration Procedure— Type 535A
shift of the trace while turning the horizontal VARIABLE 10-
1 front-panel control.
17. Check EXT. HORIZ. INPUT Deflection factor
With conditions as in Step 16 above, connect a jumper
from CAL. OUT to HORIZ. INPUT, set CALIBRATOR for .2
volt and turn VARIABLE 10-1 control full right. At least one
centimeter of horizontal deflection must be observed be­
tween the two vertical lines. Increase the CALIBRATOR to
2 VOLTS and adjust VARIABLE 10-1 for exactly 10 cm of
horizontal deflection between the vertical lines. Now switch
HORIZONTAL DISPLAY to EXT. X10. Horizontal deflection
should now be 1 centimeter. (Attenuator accuracy ±2%).
18. Adjust External Horizontal Input Compen­
sation
Connect a jumper from the 'A' SAWTOOTH to the vertical
INPUT. Feed .5 VOLT from CAL. OUT. to both HORIZ.
INPUT and 'A' TRIGGER INPUT. Set controls as follows:
HORIZONTAL DISPLAY EXT. XI
TRIGGER SLOPE (A) —EXT.
TIME/CM 1 MILLISEC
VOLTS/CM (Plug-In) 10
Adjust 'A' STABILITY and TRIGGERING LEVEL controls for
a stable square-wave, displayed vertically. Adjust C330 (see
Top View, Fig. 6-3) for optimum square wave response.
Now switch the HORIZONTAL DISPLAY to EXT. XI0, in­
crease CALIBRATOR signal to 5 VOLTS, and adjust C301C
(see Right Side View, Fig. 6-2) for optimum flattop.
19. Adjust Sweep Calibration
Set controls as follows:
HORIZONTAL DISPLAY B
TIME/CM (B) 1 MILLISEC
TRIGGERING MODE AC
TRIGGER SLOPE +INT
5X MAGNIFIER OFF
VOLTS/CM (Plug-In) 2
Connect 1 millisecond markers from the Type 180A to the
Vertical INPUT and adjust ‘B1 triggering for a stable display.
Adjust Sweep Cal. (see Right Side View, Fig. 6-2) for 1 time­
marker per centimeter. After this adjustment is made, the
5X Mag. Gain and the Sweep Mag. Register should be
rechecked. (Steps 14 and 15.)
20. Adjust Time Base A Sweep Rate
Switch HORIZONTAL DISPLAY to A, set TIME/CM to 1
MILLISEC, VARIABLE to CALIBRATED, and adjust A' trigger­
ing for a stable display. Adjust R160Z (see Right Side View,
Fig. 6-2) for the same timing as that obtained for the ‘B
sweep in Step 19 above, ±5%.
21. Adjust Time
Base A Sweep Length
With control as in Step 20 above, adjust the Sweep Length
control (see Top View, Fig. 6-3) for a sweep length of 10.5
centimeters.
22. Check Time Base B Sweep Rates
Starting with conditions as in Step 19 above, check TIME
BASE B sweep rates according to the following table:
TIME BASE B
TYPE 180A Markers displayed
1 MILLISEC 1 MILLISECOND 1 /cm
2 MILLISEC
1 MILLISECOND 2/cm
5 MILLISEC 5 MILLISECOND 1 /cm
10 MILLISEC
10 MILLISECOND 1 /cm
20 MILLISEC 10 MILLISECOND
2/cm
50 MILLISEC 50 MILLISECOND
1 /cm
.1 SEC
100 MILLISECOND 1 /cm
.2 SEC
100 MILLISECOND 2/cm
.5 SEC 500 MILLISECOND 1 /cm
1 SEC
1 SECOND
1
/cm
23. Check Time Base A Sweep Rates
Starting with conditions as in Step 20 above, check TIME
BASE A sweep rates according to the following table:
TIME BASE A TYPE 180A Markers displayed
1 MILLISEC 1 MILLISECOND
1 /cm
2 MILLISEC
1 MILLISECOND 2/cm
5 MILLISEC 5 MILLISECOND 1 /cm
10 MILLISEC
10 MILLISECOND 1 /cm
20 MILLISEC 10 MILLISECOND
2/cm
50 MILLISEC
50 MILLISECOND 1 /cm
.1 SECOND 100 MILLISECOND 1 /cm
.2 SECOND
100 MILLISECOND 2/cm
.5 SECOND
500 MILLISECOND 1 /cm
1 SECOND 1 SECOND 1 /cm
2 SECOND 1 SECOND
2/cm
5 SECOND 5 SECOND
1 /cm
NOTE
Any non-linearity present in the sweep will always
be in the first and last centimeter. Consequently,
all timing adjustments should be made from the 1
cm line to the 9 cm line in the graticule.
24. Check Time Base A —Variable Time/CM
control and Uncalibrated Neon.
The VARIABLE control provides for a complete range of
control between the calibrated TIME/CM steps. To check
operation of this control, set TIME/CM to 1 MILLISEC—CALI­
6-7