Tektronix Field Service; Test Equipment Required; Calibration (Cont) - Tektronix 221 Instruction Manual

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
or representative.
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.
Description
1. Constant Amplitude 50 kHz reference frequency;
Signal Generator maximum frequency 6 MHz;
variable amplitude.
2. Standard Amplitude Amplitude accuracy 0.25%,
Calibrator
variable amplitude; 5 mV to
100 V;
square wave.
3. Square-wave Variable frequency: 10 Hz to
Generator 1 MHz;
400 mV to 80 V.
4. 1 :2 voltage step-up 1 Double line voltage, 50 watt
transformer rating.
Variable Auto- 1
Variable line voltage 90 V to
transformer
125 V.
5. Digital Multimeter
0.1 % accuracy.
6. Time Mark Generator
0.1 % accuracy.
'Both items can be replaced by a unit possessing the appropriate characteristics, such as General Radio W10MT3W. The Voltage step-up
transformer is needed only when 230 VAC Line Voltage is not convenient.
®i
CALIBRATION
Table 5-1

TEST EQUIPMENT REQUIRED

Minimum Specifications
frequency: 1 kHz
output amplitude:
REV. APR 1974
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 ­
tion is needed.
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.
Usage
Check horizontal vertical and
trigger bandwidth
Check horizontal and vertical
gain.
Check probe and vertical
compensation.
Check power supply and charger
operation.
Check power supply and charger
operation.
Check power supply and charger
operation.
Check horizontal timing.
Section 5 — 221 Service
Examples of Applicable
Test Equipment
Tektronix Type 191 Constant
Amplitude Signal Generator.
Tektronix calibration fixture,
Part Number 067-0502-01
Tektronix Type 106 Square ­
wave Generator.
1 :2 power transformer.
Superior Electric Powerstat
Type N10B.
Tektronix DM501 (Used
with TM mainframe).
Tektronix TG 501 (Used with
TM mainframe).
5-1