Tektronix 114 - Page 23

Maintenance and Calibration — Type 114
Fig, 4-12. Crf display showing correct adjustment of WIDTH CAL
control R180.
11. Adjust 100 nS Pulse Width capacitor
C195F
©
a. Set the Type 114 WIDTH switch t o 100 nS, set the PE 
RIOD switch to 1 µ S (see Fig. 414).
b. Set the Type 547 TIME/CM (B) to .1 µ SEC.
c. Set the Type 1A1 Channel 1 VOLTS/CM switch t o 2.
Rotate the Type 114 AMPLITUDE — VARIABLE and the Type
1A1 Channel 1 POSITION controls lor 5 cm of pulse ampli 
tude. Center the pulse vertically on the graticule. Set the
Type 547 TRIGGERING LEVEL control for stable triggering.
d. Set the Type 180A to deliver 10 m c sine-wave output.
e. Use the Type 1A1 Channel 2 POSITION control to posi 
tion the top of the sine waves from the Type 180A to the
graticule centerline.
Fig. 4-13. location of WIDTH CAL control R180
f. Set the SWEEP MAGNIFIER control to X5. Use the HORI 
ZONTAL POSITION and TRIGGERING LEVEL controls to
obtain the display shown in Fig. 4-15.
NOTE
At 100 nanosecond pulse widths, the risetime and
falltime of the pulse becomes a significant portion
of the pulse width, therefore the pulse width meas 
urement is made at the 50% amplitude points.
Fig. 4-14. Control sortings for adjusting l 00 nS Pulse Width capacitor C195F.
4-9