Tektronix 114 User Manual

Maintenance and Calibration — Type 114
1 µ sec period
adjust C115F R125 PERIOD CAL
T281
Primary
connections
WIDTH
CAL
R180
100 nsec width
adjust C195F
+25 -VOLT SUPPLY
+35- VOLT SUPPLY
+25 V OLTS
ADJUST
R290
Fig. 4-3, Type 114 chassis, bottom view.
2. Check +35-volt unregulated supply
a. Change the VOM positive lead to the positive terminal
of C298.
b. Check that the meter reads 4-33 volts 4 2 volts.
Fig. 4-4. + 25 volt supply adjustment.
3. Check voltage across D209
a. Change the VOM positive lead to the junction of D208,
R2 0 9 and D209.
b. Check that the meter reads + 3 volts ±½ volt from
the j unction to chassis ground.
4. Check + 25-volt supply regulation
a. Change the VOM positive lead to the outside shell of
C298. Chock that the meter reads +2 5 volts ± 0.5 v.
b. Using the variable line voltage source, vary the line
volt age from 94.5 to 137.5 volts.
c. Check that the VOM reading does not change more
than 0.5 v while the line voltage is varied over the range
specified.
d. Return the variable line voltage source to 115 volts.
5. Check + 25-volt supply for ripple
a. Remove the VOM leads. Remove the 50 Ω termination
from the Type 1A1 input but leave it connected to the coax
cable.
b. Connect a 1 X probe to the Type 1A1 Channel 1 input.
c. Set the test oscilloscope for line triggering. Using the
1 X probe, check that the ripple on the outside shell of C298
does not exceed 10 millivolts. Check only for 60- or 120-
cycle ripple; disregard the various transients noted.
d. Set the variable line voltage for 94 . 5 volts and again
check that the ripple does not exceed 10 millivolts.
e. Return the variable line voltage source to 115 volts
and remove the 1 X probe from C298 and from the Type 1A1
Channel 1 input.
4-5

Tektronix 114 Specifications

General

Brand	Tektronix
Model	114
Category	Pulse Generator
Language	English