7.
CHECK PULSE VOLTS SWITCH STEPS
Switch PULSE VOLTS switch to 5 and check for 5 volts of signal
amplitude. Check each step of this switch for indicated output
within ±2$. Check VARIABLE PULSE VOLTS control to be smooth in
operation and. tvpve a range from 1 to 2,5! times attenuation,
8.
CHECK USAS VOLTS
Connect meter across C58Q2 and position
BIAS VOLTS
control to
obtain
0
volts reading.
Index knob to
0
and tighten set screw. Check con
trol for tracking with front panel indication throughout its range,
on both XI and X10,
9.
CHECK REGULATION OF ALL POWER SUPPLIES
Set BIAS VOLTS at 0 and XI, Attach test probe and voltmeter to the
output of the bias power supply. Connect the 5-8 test load across
C5>802. Turn BIAS VOLTS slowly to the right (cw) and observe the volt
age at which the power supply goes out of regulation (typically 3»3 v).
Turn
VOLTS VARIABLE full left (ccw). Attach test probe to the
output of the floating power supply. Connect the voltmeter and the
5-8
test load across
C5801.
Turn PULSE VOLTS VARIABLE slowly to the
right (cw) and observe the v oltage at which the power supply goes out
of regulation (typically i
j
.
v ) ,
Turn
COLLECTOR
SOURCE
VOLTS full left (ccw). Attach test probe and
meter to the
output
of the collector power supply. Connect 5 and 25-8
test loads
in
series across C68U7. Turn COLLECTOR SOURCE VOLTS slowly
to the right (cw) and check to see that power supply voltage remains the
same and stays
in
regulation as COLLECTOR SOURCE VOLTS is varied
throughout its range with load and without load,
10.
ADJUST HF PEAKING (R6808)
Install TYPE R unit in plug-in compartment. Turn TRIGGER SLOPE to
+INT. Apply square wave from 107 to SCOPE INPUT through special
scope input adapter. Depress PUSH TO CONNECT SCOPE INPUT TO THIS
TERMINAL. With TIME/CM at 1 pSEC X2, obtain a stable display through
adjustment of TRIGGER LEVEL and STABILITY controls. Obtain approxi
mately 3 cm of vertical deflection and adjust R6808 for optimum
leading edge.
11.
ADJUST PULSER HF COMPENSATIONS (L$80)4 and L5812)
Remove TYPE R plug-in from plug-in box and insert short extension.
Re-install plug-in. Connect ^TRIGGER cable to TRIGGER IN and turn
TRIGGER SLOPE to +EXT. Turn COLLECTOR SOURCE VOLTS to PNP. Turn
PULSE VOLTS to - , T v o l t s and CALIBRATED. Turn BIAS VOLTS full
right TcwF*and IloT Turn COLLECTOR CURRENT MA/CM to .5 and SERIES
RESISTOR to 50. Turn TIME7cFTto 7 1 pSEC/CM and STABILITY full right
Tcw7. Install grounded emitter transistor board using
2
iJjpldi
transistor
on the front of the R unit. Turn BIAS VOLTS slowly to the left (ccw)
until approximately 3 cm of vertical deflection are obtained. Adjust
STABILITY and TRIGGER LEVEL to obtain a stable display. Then adjust
158011 and L5812 for optimum square-wave presentation.
January,
\
9%9
R-U
