Tektronix 535 Calibration Procedure

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.
Preset R6U to CW,
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:
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:
With no plug-in unit in position, check the resistances to ground of the
lowvoltage power supplies.
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.
are progressively higher as you go to more positive voltages.
ply might be expected to have a resistance of about 50,000 ohms.)
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.
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.
relay is actually operated with about
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.
are indicated by PLAIN CAPITALS.
CCW, counter-clockwise; MS, mid-scale.
August, 1956
Revised
960
November, i
TYPE 535
Serial Numbers 101 through
Delaying Sweep TRIGGERING LEVEL— 0.
SLOPE (toggle)— *.
ATTEN. (toggle)— XI.
TIME/CM OR DELAY TIME— 1 millisec
HORIZONTAL POSITION— MS.
VERNIER— MS.
CALIBRATOR— OFF.
INTENSITY— CCW.
(This is a small screwdriver-slotted potentiometer con­
(l) CAL ADJ, and (2) R99M— the latter
C 2 h 0
(While no tolerances are specified, it may be stated
The resistances of the remaining supplies
In the interest of positive contact operation, the
9
These abbreviations are used:
60kk
» » STABILITY-CCW.
C2Sh>
, C278, C286.
volts applied, and the operating time
Internal adjustments
The 500-volt sup­
If any two sup­
Check that
CW, clockwise;
FD-535-1