Tektronix Field Service; Test Equipment Required - Tektronix 221 Service Manual

Section 5—221 Service
CALIBRATION
TEKTRONIX FIELD SERVICE
Tektronix, Inc. provides complete instrument repair and
recalibration at the Field Service Centers, and the Factory
Service Center. Contact your local Tektronix Field Office
To assure instrument accuracy, check the calibration of
the 221 every 1000 hours of operation, or every six months
if used infrequently. Before calibrating the 221, thoroughly
clean and inspect the instrument; see the maintenance
section of this manual.
To aid in locating a step in this procedure, an index is
given before the complete procedure. Where possible, the
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 tolerance.
TEST EQUIPMENT REQUIRED
The following test equipment and accessories, or equiv-
alent, are required for the complete calibration of the 221
The given specifications for the test equipment are the
minimum necessary for accurate calibration. Therefore, the
specifications of any test equipment used must meet or
exceed the listed specifications. All the test equipment is
assumed to be correctly calibrated and operating within the
listed specification. Detailed operating instructions for the
test equipment are not given in this procedure. Refer to the
instruction manual for the test equipment if more informa-
Special Tektronix Calibration Fixtures are used in this
procedure only where they facilitate instrument calibration.
These calibration fixtures are available from Tektronix, Inc.
Order by part number through your local Tektronix Field
Office or representative.
Table 5-1
TEST EQUIPMENT REQUIRED
Description Minimum Specifications
Usage Test Equipment
1. Constant Amplitude
Signal Generator
50 kHz reference frequency;
maximum frequency 6 MHz;
variable amplitude.
Check horizontal, vertical and
trigger bandwidth
Tektronix Type 191 Constant
Amplitude Signal Generator.
2. Standard Amplitude Amplitude accuracy: 0.25%,
100 V; frequency: 1kHz
Check horizontal and vertical Tektronix calibration fixture,
Part Number 067-0502-01
3. Square-wave
Generator
Variable frequency: 10 Hz to
1 MHz; output amplitude:
Check probe and _ vertical
compensation.
Tektronix Type 106 Square-
wave Generator.
4. 1:2 voltage step-up!
Check power supply and charger
operation.
Variable Auto-!
transformer
Check power supply and charger Superior Electric Powerstat
5. Digital Multimeter 0.1% accuracy.
Check power supply and charger
operation.
Tektronix DM501_— (Used
with TM mainframe).
6. Time Mark Generator] 0.1% accuracy.
Check horizontal timing.
Tektronix TG 501 (Used with
TM mainframe).
Both items can be replaced by a unit possessing the appropriate characteristics, such as General Radio W1OMT3W. The Voltage step-up
@l REV. APR 1974 5-1