Prelim Inary Procedure; Prelim Inary Control Settings - Tektronix 221 Instruction Manual

Calibration—221 Service
Description
7. Cable
Impedance,
RG-58/U, length, 42 inches,
connectors, BNC.
8. Adapter
Connectors, BNC female and
dual banana plug.
9. Adapter
Connectors, GR874 and BNC
female.
lO.Termination Im p e d a n c e ,
accuracy,
BNC.
11. Attenuator
Ratio, 10X; connectors, BNC;
impedance, 50 ohms.
12. Adapter Connectors,
BNC.
13. T-Connector Connectors, BNC.
-14. Screwdriver Three-inch
bit.
3/4-inch shaft.
15. Low-Capacitance
Screwdriver 5/64 inch bit.
P R E LIM IN A R Y PROCEDURE
This instrument should be calibrated at an ambient
temperature of +25°C (±5°C) for best overall accuracy.
1 Disassemble as instructed in the Maintenance Section.
2. Connect the instrument to 90 Vac, to 250 Vac, 48 Hz
to 62 Hz or 80 Vdc to 250 Vdc line source.
3. Set the instrument controls as given in the Prelimi­
nary Control Settings. A llow at least five minutes of
warmup before proceeding.
NOTE
Titles fo r external controls o f this instrument are
capitalized in the procedure (e.g., INTENSITY).
Internal adjustments are in itia l capitalized only (e.g..
Sweep Cal).
5-2
Table 5-1 (cont)
TEST EQUIPM ENT R EQ U IR E D
Minimum Specifications
50 ohms; type,
5 0 o h m s ;
2%, connectors,
probe tip to
shaft, 3/32 inch
Usage
External trigger operation check.
H o rizo n ta l gain check
adjustment.
External trigger checks.
Vertical Am plifier compensation
checks and adjustment
Vertical Am plifier compensation
checks and adjustment.
Vertical Am plifier bandwidth
check.
Used throughout procedure for
signal interconnection.
E x te rn a l trig g e r operation
checks.
Used throughout procedure to
adjust variable resistors.
U sed to a d ju s t v a ria b le
capacitors.
4. See the Adjustment Locations in the pullout pages.
P R E LIM IN A R Y CONTROL SETTINGS
Preset the instrument controls to the settings given
below, when starting the calibration procedures.
VO LTS/DIV
SEC/DIV
Vertical POS
Horizontal POS
TRIGGER
TRIG LEVEL/SLOPE
INPUT COUPLING
HORIZ-MAG
VAR SEC/DIV (Time/Div)
VAR VO LTS/DIV
INTENSITY
Examples of Applicable
Test Equipment
T e k tr o n ix P a rt
and 012-0057-01.
T e k tr o n ix P art
103-0090-00.
T e k tr o n ix P a rt
017-0063-00.
T e k tr o n ix P art
011-0049-01.
T e k tr o n ix P a rt
011-0059-02.
T e k tr o n ix P art
013-0084-01
T e k tr o n ix P art
103-0030-00.
Xcelite R-3323.
T e k tr o n ix P a rt
003-0675-00.
J.F D A d justm e nt
5284.
0.1
1 m
Midrange
Midrange
Internal
AUTO PRESET
GND
IX
CAL
CAL
(Out of CCW Detent, ON)
As desired.
REV. B, AUG. 1976
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