Tektronix 114 - Page 24

Maintenance and Calibration — Type 114
g. Ad|ust C195F (see Fig. 4-16) for 100 nanoseconds pulse
width. Allowable error is ± 3%, however, it is possible to
adjust more closely than this.
Fig. 4-15. Crt display for proper setting of 100 nS Pulse Width
capacitor C195F.
14. Check operation in square-wave mode
a. Set the Type 114 WIDTH control to SQUARE WAVE.
b. Using Table 4-4 check square wave operation for all
positions of the PERIOD control. Allowable period error is
4 mm within the center 8 cm of the trace
TABLE 4-4
Type 114
PERIOD
Type 547
TIME/CM (B)
Cycles/8 cm
10 mS
10 mSEC 8
1 mS 1 mSEC
8
100 µ S
.1 mSEC
8
10 µ S
10 µ SEC
8
1 µ S 1 µ SEC
8
12. Check pulse width accuracy
Using the settings given in Table 4-3, check the pulse width
accuracy in the other settings of the WIDTH control.
TABLE 4-3
Type 114
PERIOD
Type 114
WIDTH
Type 547
TIME/CM
Type
180A
Time
Markers
Number
of
Markers
1 mS 1 mS .2 mSEC
100 µ sec
10
1 mS 100 µ S
20 µ SEC
10 µsec
10
100 µ S 10 µ S
2 µ SEC
1 µsec
10
10 µ S
1 µ S .2 µ SEC 10 m c
10 cycles
13. Check WIDTH — VARIABLE control range
a. Set the Type 114 WIDTH control to 100^5, set the PE 
RIOD control to 10 mS and the PERIOD — VARIABLE control
to CAL.
b. Set the Type 180A for 100 microsecond markers.
c. Set the Type 1A1 Channel 1 VOLTS/CM switch to 5.
d. Set the Type 547 TIME/CM (B) to .2 mSEC, the TRIG 
GERING SLOPE switch to +, and adjust the TRIGGERING
LEVEL control for a stable display.
e. Slowly rotate the WIDTH — VARIABLE control clock 
wise. Check for a pulse width of at least 1 millisecond (ten
100 microsecond markers) at the clockwise end of rotation
( see Fig. 4-12).
f. Return the WIDTH VARIABLE control to the CAL
position.
15. Check output amplitude (into the 5012 ter 
mination)
a . Turn the Type 114 AMPLITUDE — VARIABLE control
slowly counterclockwise, checking for smooth mechanical and
electrical oporation.
b. Set the Type 1A1 Channel 1 VOLTS/CM switch to 1
and check for 3 cm or less of vertical deflection when the
AMPLITUDE VARIABLE control is fully counterclockwise.
Fig. 4-16. location of 100 nS Pulse Width capacitor C195F.
c. Set the Type 1A1 Channel 1 VOLTS/CM switch to 2.
Rotate the Type 114 AMPLITUDE — VARIABLE control fully
clockwise. Check for 5 cm or more of vertical deflection.
d. Change the AMPLITUDE switch to — 3 to 10 V and re 
peat the amplitude check. Check both the + and — 1 V to
3 V positions of the AMPLITUDE switch.
4-10