Tektronix 507, Instruction Manual

Page: 25 / 60

to slightly readjust the STABILITY and INTENSITY
controls to obtain a stable display of the markers
with suitable brightness. The timing of the high­
speed sweeps is adjusted by means of the timing
capacitors C177E to C177L located on the timing
switch; the linearity of the faster sweeps is ad­
justed by means of C303 located on the black
bakelite panel near the neck pins of the cathode-
ray tube. The timing of the slower sweeps is ad­
justed by means of the timing resistors R176C to
R176J, located on the brown bakelite panel
alongside the timing switch. The linearity of the
slower sweeps is adjusted by means of the LOW
FREQ. COMP, control R304, located on the back
bakelite panel opposite C303.
Before retiming the sweep, make sure the tim­
ing of the time-markers is accurate (see step 7)
and that the instrument is thoroughly warmed
up. For best results the sweep should be timed in
the sequence indicated in the table.
9. Vertical Positioning V oltage
Connect a voltmeter to the + 150-volt test
point and adjust the +150 V POS CAL control
R418 for exactly +150 volts; then connect the
voltmeter to the —150-volt test point and adjust
the —150 V POS CAL control R421 for exactly
—150 volts. These two controls inter-act so it
will be necessary to work back and forth be­
tween the two controls to obtain the proper set­
ting of each.
10. Vertical High-Frequency Compensation
The series inductor L413 and the shunt capaci­
tor C445 are adjusted at the factory to obtain
optimum risetime characteristics in the vertical
deflection circuit. These controls will normally
require no further adjustments.
® ADJUSTMENT PROCEDURE — TYPE 5 0 7
4-3