Performance Check— Type 503
—
I
J
C
L
J
_
C"
L
J
1
i
L
J
l l l l
" I 1
L
J
J
I
L
J
J
L
L
J
L
L
J
i
—t—
1
1
1 '
1
1
_L_
1
1
1
_ i_
1
1
1
-il,,
1
1
__l
__
1
1
1
—|
---
1
1
1
- 1
1
1
1
—i
---
i
(A ) C306 misadjusted
(B) C306 correctly adjusted
Fig. 5-4. Typical display, Horizontal Amplifier attenuator compensation check; 1 kHz square-wave input; SWEEP TIME/CM switch setting, 2 mSEC.
VERTICAL
SENSITIVITY
1 VOLTS/CM
VARIABLE
CALIBRATED
+ INPUT
DC
-INP UT
GND
HORIZONTAL
SENSITIVITY .2 VOLTS/CM
VARIABLE CALIBRATED
+INPUT
DC
-IN PU T GND
Test Oscilloscope (Type 503)
Sweep Time/cm
2 mSEC
Trigger Source
Ext.
Trigger Level
Adjust for stable display
Horizontal Display Sweep Normal (X I)
c. Remove the right side panel from the test oscilloscope
d. Connect a 10X probe to the VERTICAL +INPUT con
nector, and connect the probe tip to pin 8 of V I60 in the
test oscilloscope (i.e., a test point to obtain a sawtooth
waveform).
e. Connect a 1-kHz square-wave signal from the square-
wave generator through a 50-ohm termination (or 10X atten
uator), a 50-ohm cable, a UHF T connector, and a 47 pF
Input Time - constant Standardizer to the HORIZONTAL
-(-INPUT connector, in the order given.
f. Connect another 50-ohm cable from the UHF T con
nector to the test oscilloscope Ext Trig. In connector.
g. Adjust the test oscilloscope Trigger Level control to
obtain a stable display on the Type 503. The display should
be similar to Fig. 5-4.
h. Adjust the generator output for a 3-cm spacing hori
zontally, and center the display with the HORIZONTAL
POSITION control.
i. Check— Square waveform showing no more than 2%
overshoot, rounding, or tilt.
j. Change the test oscilloscope Sweep Time/cm to .1
millisecond.
k. Check—Square front corner on waveform, showing
no more than 2% rounding or overshoot. See Fig. 5-5 for
typical displays.
l. Check the square wave response in all remaining
HORIZONTAL SENSITIVITY switch positions, alternately
switching between the 2 millisecond and 0.1 millisecond
Sweep Time/cm switch positions in the test oscilloscope.
NOTE
All attenuator compensation checks are made with
a display amplitude of 3 cm. Insert or remove
attenuation a nd /o r adjust the signal generator
output to maintain this amplitude.
m. Change the HORIZONTAL +INPUT switch to GND,
the HORIZONTAL —INPUT switch to DC, and move the
Time-constant Standardizer to the HORIZONTAL —INPUT
connector.
n. Repeat steps (g) through (I).
2Q. Check Amplifier Phasing— 1 mY/CM to .2
VOLTS/CM
o. R e q u ir e m in W h a n shift not more than 1 ° to 450 k ill.
b. Set the Type 503 controls as follows:
5-7
To Next Page
Loading...
