Tektronix 7A29 Instruction Manual page 54

Calibration Part
I—
-7A29
Performance
Check
NOTE
It
is
essential that the Oscilloscope
Mainframe
sensitivity
be properly ad/usted prior
to
performing
this step
Check the Oscilloscope
Mainframe
Instruction
Manual
for
adjustment
procedure
A6.
CHECK LOW-FREQUENCY
STEP
RESPONSE
NOTE
If
the preceding step
was
not performed,
first
perform
step A1. then proceed.
b
CHECK—
Rotate the
GAIN
control
fully
clockwise
and
observe
at least
5
15
divisions of
displayed
square
wave
signal.
C.
CHECK
-Rotate
the
GAIN
control
fully
counter-
clockwise
and observe 4.85
divisions, or less
of
displayed
square-
wave
signal
d Set the
GAIN
control
for
exactly 5 divisions
of
square-
wave
signal.
e
CHECK
-Using
the
VOLTS/DIV and
Calibration
Generator settings given
in
Table
5-4,
check
that
the
vertical
deflection
is
correct
within
2%
for
each
position
of the
VOLTS/DIV
switch
f.
Push
to
release the
VARIABLE
(Volts/Div) control
g
Rotate
the
VARIABLE
(Volts/Div)
control
fully
counterclockwise.
h
CHECK—
for
19
divisions or less
of
displayed square
wave.
i.
Change
the
POLARITY
switch
to
INVERT.
TABLE
5-4
Vertical
Deflection
Accuracy
Volts/Div
Switch
Setting
Calibration
Generator
Output
(open
circuit)
Vertical
Deflection
in
Divisions
Maximum
Error
in
Divisions
10
mV
0.1
V
5 ±0.1
20
mV
0
2
V
5 ±0.1
50
mV
0.5
V
5
±0.1
.2
V
2
0
V
5
±0.1
5
V
5.0
V
5 ±0.1
1
V
10
V
5 ±0.1
A6.
SETUP CONDITIONS
7A29
Controls
VOLTS/DIV 0.1
V
VARIABLE
(Volts/Div)
CAL
IN
POLARITY
*UP
Oscilloscope
Mainframe
LJ
—
waii-
7A29
£=
Sifl
Stan
Time
7
BNC
Coaxial
Cable
Test
Equipment Controls:
Oscilloscope
Mainframe
Vertical
Mode
Left
Calibration
Generator
Period
10
ms
Variable Period
Fullv
counterclockwise
Signal Standardize!
Test Selector Vert or Horiz
Step Resp
Rep Rate 100 Hz
Time Base
2
ms/div
2320 36
a Set the Calibration
Generator Amplitude
control
to
display 8 divisions of signal
centered
on the
crt.
b Set
the Oscilloscope
Mainframe
Vertical
Mode
to
Right.
j.
CHECK—
For
19
divisions or less
of
displayed
square
wave.
c
Set the Signal Standardizer
Amplitude
control
to
k
Disconnect
the
Calibration
Generator from the
7A29
display
8
divisions of signal
centered on
the
crt.
5-11