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General
To assure instrument accuracy , check the calibration of
the 212 every 1000 hours of operation , or every six months
if used infrequently . Before complete calibration , throughly
clean
and
inspect this instrument as outlined in the
Preventive Maintenance section .
Tektronix , Inc., provides complete instrument repair and
recalibration at local Field Service Centers and the Factory
Service Center . Contact your local TEKTRONIX Field
Office or representative for further information .
To aid in locating a step in this procedure , an index is
given prior to the complete procedure . Completion of each
step in the Calibration procedure ensures that this instru
ment meets the electrical
specifications given in the
Introduction of this manual . Where possible , instrument
performance is checked before an adjustment is made . For
best overall instrument performance , make each adjustment
to the exact setting even if the CHECK - step is within the
allowable tolerances .
Description
1. Time- Mark Generator
2. Standard Amplitude
Calibrator
CALIBRATION
3. Square-Wave
Generator
4. Low- Frequency
Constant-Amplitude
Signal Generator
5. DC Voltmeter
A
TEST EQUIPMENT REQUIRED
The following test equipment and accessories, or their
equivalent, are required for complete calibration of the
212. Given specifications for the test equipment are the
minimum necessary for accurate calibration . Therefore, the
specifications of any test equipment must either meet or
exceed those listed below . All test equipment is assumed to
be correctly calibrated and operating within the listed
specifications . Detailed operating instructions for the test
units are not
given
in this procedure . Refer to the
instruction manual for the test equipment if more infor
mation is needed .
Special Calibration Fixtures
Special TEKTRONIX Calibration fixtures are used in
this procedure only where they facilitate instrument cali
bration . These special calibration fixtures are available from
Tektronix , Inc. Order by part number through your local
TEKTRONIX Field Office or representative.
TABLE 4-1
TEST EQUIPMENT
Minimum Specifications
Marker outputs, 5 microseconds to 0.1
second ; marker accuracy , within 0.1 % .
Amplitude
accuracy ,
0.25% ; signal
amplitude , 5 millivolts to 100 volts ;
output
signal
one-kilohertz
square
wave .
Frequency , one
kilohertz ; risetime,
100
nanoseconds
or
less; output
amplitude , 0.4 volt to 40 volts.
Frequency,
one
kilohertz
to
500
kilohertz ; output amplitude , at least
200 millivolts .
Range , zero to 1000 volts ; accuracy,
within
3% ;
input
impedance,
20,000 $ 2/volt .
Usage
Horizontal
timing check
and adjustment.
Vertical
and
horizontal
amplifier gain checks and
adjustments.
Vertical
amplifier
compensation checks and
adjustments .
Vertical
Amplifier
bandwidth check. Trigger
operation checks .
Calibration - 212
Power supply output level
checks.
Vertical
and
horizontal
centering
adjustment . CRT grid bias
adjustment.
Example
a . TEKTRONIX
2901
Time-Mark
Generator.
b . TEKTRONIX
184
Time-Mark
Generator.
a .
TEKTRONIX
calibration fixture Part
Number
067-0502-01 .
a . TEKTRONIX
Type
106
Square - Wave
Generator .
a .
General
Radio
1310-B Oscillator .
a . Triplett
Model
630-NA .
b . Simpson Model 262.
4-1
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