ADJUSTMENTS
Section 6—455/A2/B2
IMPORTANT-PLEASE READ BEFORE USING THIS PROCEDURE
The purpose of this procedure is to provide an adjustment sequence that will allow an operating instrument to be adjusted to
meet its original performance requirements; it is not intended as a troubleshooting guide. Any trouble which becomes appar
ent during the adjustment sequence should be corrected before proceeding. Refer to the Troubleshooting portion of the
Maintenance section.
TOLERANCES
Limits and tolerances are instrument specifications only if
they are called out as performance requirements in the
Specification sections.
Tolerances given are for the oscilloscope under test and do
not include test equipment error.
ADJUSTMENT INTERACTION
Some adjustments interact with others, these are identified
with an INTERACTION step.
PARTIAL PROCEDURES
Partial adjustment is sometimes desirable after replacing
components or to touch up adjustments between major
recalibrations. Adjustments can be made to individual
circuits without having to perform the complete adjustment
procedure. However, do not change the setting of the +32 V
adjustment unless you intend to readjust the entire instrument.
To prevent unnecessary readjustment of other parts of the
instrument, reset an adjustment only if the tolerance given
for that step is not met. If it is necessary to reset an ad
justment, also check any steps listed in the INTERACTION-
part of the step.
TEST EQUIPMENT REQUIRED
The test equipment listed in Table 6-1, or equivalent is re
quired for complete calibration of the oscilloscope. Speci
fications given for the equipment are the minimum neces
sary for accurate calibration.
TABLE 6-1
Test Equipment Required for Adjustment Procedure
Description
Minimum Specifications Usage Example of Applicable
Test Equipment
1. Digital Voltmeter
Range, 0 to 32 V dc; dc voltage
accuracy, 0.1 %; display, 4 'k
digits.
Power supply adjustments.
Calibrator amplitude adjust
ment. Crt grid bias adjust
ment.
a. Tektronix DM501 Digital
Multimeter.1
2. Time-Mark Generator Marker outputs, 10 ns to 0.5s;
marker accuracy, within 0.1%;
trigger output, 1 ms to 0.1 ns,
time coincident with markers.
Y-Axis alignment. Geometry
adjustment. A & B timing
adjustments.
a. Tektronix TG501 Time-Mark
Generator.1
b. Tektronix 2901 Time-Mark
Generator.
3. Amplitude Calibrator Amplitude accuracy, within
0.25%; signal amplitude, 20 mV
to 2 V square wave; frequency,
1 kHz.
Vertical gain adjustment.
X gain adjustment. Trigger
view gain adjustment.
a. Tektronix PG506 Calibration
Generator.1
b. Tektronix 067-0502-01
Calibration Fixture.
Requires TM500 Series Power Module.
REV. A, OCT 1975
6-1
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