JACO NO. 125 TEKTRONIX PART NO. 003-0 0 0
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] JACO NO. 125 TEKTRONIX PART NO. 003-001
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Fig. 6-1. Tools required for calibrating the Type 502
Oscilloscope.
5. Square-wave generator, Tektronix Type 105.
If a Type 105 Square-Wave Generator is not
available, it will be necessary to substitute a
square-wave generator with the following speci
fications: (1) output frequencies of 200 cycles.
1 kilocycle, and 10 kilocycles, (2) risetime no
more than 20 millimicroseconds, and (3) output
amplitude variable between approximately 40
millivolts and approximately 100 volts.
6. Oscilloscope, Tektronix Type 316. If a Type
316 Oscilloscope is not available, it will be
necessary to substitute an oscilloscope with the
following specifications: (1) calibrated vertical
deflection factors from .01 to 10 volts per divi
sion and (2) bandpass of dc to 10 megacycles.
7. Tektronix Type P52, 52-ohm Coaxial Cable.
8. Tektronix Type B52-R, 52-ohm Termination
Resistor.
9. Tektronix Type CS47, 47 jujuf Input Capaci
tance Standardizer.
10. Tektronix Type B52-T10, 52-ohm T-Pad.
11. Alignment tools.
LOW-VOLTAGE POWER SUPPLY
Preliminary.
Rotate the INTENSITY control fully counter
clockwise and connect the power cord and the
ac voltmeter to the output of the autotrans
former. Rotate the SCALE ILLUM control clock
wise to the On position and adjust the autotrans-
former for an output of 117 volts (or 234 volts).
Allow the instrument to warm up for several
minutes before proceeding with the recalibration
adjustments. During recalibration, periodically
check the input voltage to the instrument and
adjust the autotransformer as necessary to main
tain the voltage at 117 or 234 volts except when
the power supply regulation is being checked.
CAUTION
Do not reset the — 150 ADJ control
unless the power supply voltages
are actually out of tolerance or you
are planning to perform a complete
recalibration of the instrument.
1. —150 ADJ. Connect the dc voltmeter to the
output of the —150-volt power supply. (Power-
supply output test points are shown in Fig. 5-4.)
Set the —150 ADJ control for a reading of —150
volts. Check that the outputs of the + 100- and
+350-volt supplies are within the specified
±3 % tolerances. If either the +100- or +350-
volt supplies are out of tolerance, reset the —150
ADJ control slightly until all power supply volt
ages are within tolerances.
Fig. 6-2 Input power connections for the oscilloscope
being recalibrated.
Vary the output of the autotransformer be
tween 105 and 125 volts (or between 210 and
250 volts) to check the regulation of the low-
voltage power supplies. The power supplies
must regulate within d=3% of their correct volt
ages. Place the SQUARE-WAVE CALIBRATOR
switch in the OFF position and the FIORIZONTAL
DISPLAY switch in the 2 EXT VOLTS/CM position.
Using the test oscilloscope, check the ripple volt
age at the output of each power supply when
the autotransformer is adjusted for 117 volts.
Ripple voltages at the output of all the low-volt
age power supplies except the +350-volt supply
should be approximately 5 millivolts. Ripple
voltage at the output of the +350-volt supply
should be approximately 10 millivolts.
6-2
RECALIBRATION PROCEDURE — TYPE 502
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