TYPE 535
Serial Numbers 101 through
60kk
SUGGESTED
FACTORY CALIBRATION PROCEDURE
Preset front-panel controls as follows:*
POWER SWITCH— OFF.
Main Sweep TRIGGERING LEVEL— 0.
"
»
STABILITY— CCW.
TRIGCER SLOPE— *INT.
TRIGGERING MODE— AC SLOW.
TIME/CM— 10 milli
sec.
MULTIPLIER— XI.
5X MAGNIFIER— OFF.
HORIZONTAL DISPLAY— MAIN SWEEP NORMAL.
Delaying Sweep TRIGGERING LEVEL— 0.
»
»
STABILITY-CCW.
SLOPE (toggle)— *.
ATTEN. (toggle)— XI.
TIME/CM OR DELAY TIME— 1 millisec
HORIZONTAL POSITION— MS.
VERNIER— MS.
CALIBRATOR— OFF.
INTENSITY— CCW.
Preset R6U to CW,
(This is a small screwdriver-slotted potentiometer con
trol without shaft, situated at right center of top deck.)
Preset DELAY STOP ADJ to about 30° from CCW stop.
The following controls may be left at the settings where they are found—
that is, they do not require presetting:
(l) CAL ADJ, and (2) R99M— the latter
being a small screwdriver-slot control mounted on the MULTIPLIER switch bracket.
Preset the remaining fourteen internal screwdriver-slotted controls to MS.
Preset the following capacitors to MS:
C 2 h 0
,
C2Sh>
C278, C286.
With no plug-in unit in position, check the resistances to ground of the
lowvoltage power supplies.
(While no tolerances are specified, it may be stated
as a general guide that the resistance of the -1^0-volt supply usually runs in the
neighborhood of I;,000 to 5,000 ohms.
The resistances of the remaining supplies
are progressively higher as you go to more positive voltages.
The 500-volt sup
ply might be expected to have a resistance of about 50,000 ohms.)
If any two sup
plies appear to have the same resistance values, you should check for a possible
short circuit between them.
Carry out the following calibration procedure:
1.
To check relay time delay.— Remove high-voltage oscillator tube V803 (6AU5).
With power-test plug-in unit in position, turn POWER switch on.
Check that
the time required for the relay to operate lies between 15 sec and U5 sec.
(The thermal time-delay relay, K700, is rated for a U5-sec delay when 6
volts are applied to it.
In the interest of positive contact operation, the
relay is actually operated with about
9
volts applied, and the operating time
may be appreciably less than U5 sec as a result.) Observe by the flickering
of neon lamp NE95, located above VbO on the sweep chassis, that the main sweep
■
“•Front-panel controls are indicated by UNDERLINED CAPITALS.
Internal adjustments
are indicated by PLAIN CAPITALS. These abbreviations are used: CW, clockwise;
CCW, counter-clockwise; MS, mid-scale.
August, 1956
FD-535-1
Revised
November, i
960
