Tektronix 503

Performance Check— Type 503
q. Change the HORIZONTAL -IN PU T to DC, and the
HORIZONTAL SENSITIVITY switch to 5mV/CM.
r. Check—Horizontal display not more than 1 cm long.
s. Change the Horizontal SENSITIVITY to 2mV/CM.
t. Check— Display not more than 2.5 cm long.
u. Change the HORIZONTAL SENSITIVITY to 1 mV/CM.
v. Check— Display not more than 5 cm long.
w. Change both HORIZONTAL INPUT switches to GND.
x. Set the VERTICAL SENSITIVITY switch to 5 mV/CM.
y. Set the VERTICAL + and —INPUT switches to DC.
z. Move the two signal cables from the HORIZONTAL
INPUT connectors to the VERTICAL INPUT connectors.
aa. Check—Amplitude of the display not more than 1 cm
anywhere in the graticule area.
ab. Change the VERTICAL SENSITIVITY switch to 2 mV/
CM.
ac. Check— Display amplitude not more than 2.5 cm in the
graticule area.
ad. Change the VERTICAL SENSITIVITY switch to 1 mV/
CM.
ae. Check— Display amplitude not more than 5 cm.
22. Check Vertical Amplifier Frequency
Response
a. Requirement— Response not more than —3 dB at 450
kHz.
b. Remove the UHF T connector and one 50-ohm cable,
and connect the other cable from the 50-ohm termination
to the VERTICAL + INPUT connector.
c. Set the HORIZONTAL + and —INPUT switches to
GND, the VERTICAL + INPUT to DC, and the VERTICAL
-IN PU T to GND.
d. Set the SWEEP TIME/CM switch to .1 mSEC, and the
HORIZONTAL DISPLAY switch to SWEEP NORMAL (X I).
e. Set the VERTICAL SENSITIVITY to 1 mV/CM and adjust
the generator output for a display 6 cm in amplitude.
f. Change the generator frequency to 450 kHz. The dis
play amplitude will decrease.
g. Check—The display amplitude should be equal to or
greater than 4.2 cm (—3 dB).
h. Repeat the frequency response check for all positions
of the VERTICAL + and —INPUT attenuator (SENSITIVITY)
switch.
23. Check Horizontal Amplifier Frequency
Response
a. Requirement— Response not more than 3 dB down at
450 kHz.
b. Set the VERTICAL -f and —INPUT switches to GND,
the HORIZONTAL -(-INPUT to DC, and connect the signal
to the HORIZONTAL + INPUT connector.
c. Change the HORIZONTAL DISPLAY switch to HORIZ.
AMPLIFIER (SWEEP DISABLED).
d. Check that the HORIZONTAL SENSITIVITY switch is
set to 1 mV/CM.
e. Set the generator frequency to 50 kHz, and adjust the
generator output for a trace 6 cm long.
f. Change the generator frequency to 450 kHz. The trace
will shorten.
g. Check—The trace should be equal to or greater than
4.2 cm long (—3 dB).
h. Repeat the frequency response checks (steps (e), (f), and
(g) for all positions of the HORIZONTAL + and —INPUT
attenuator SENSITIVITY) switch.
24. Check Sweep Stability Adjustment
a. Requirement— A free-running trace.
b. Set all + and —INPUT switches to GND.
c. Set the HORIZONTAL DISPLAY switch to SWEEP
NORMAL (X I), and the SWEEP TIME/CM to .1 mSEC.
d. Set the LEVEL control to AUTO.
e. Check— A free-running trace should be visible at an
approximate 50 Hz rate.
25. Check Triggering— External High Frequency
a. Requirement— A stable display may be obtained at
the + and — positions of the SLOPE switch at 450 kHz.
b. Set the instrument controls as follows:
SLOPE
+
COUPLING AC
SOURCE EXT.
LEVEL
AUTO.
HORIZONTAL DISPLAY
SWEEP NORMAL (X I)
VERTICAL
SENSITIVITY
.1 VOLTS/CM
VARIABLE
CALIBRATED
POSITION
Midrange
+ INPUT
DC
-IN PU T
GND
SWEEP TIME/CM
5 /iSEC
Test Oscilloscope (Type 503)
Vertical Sensitivity
10 mV/cm
Vertical + Input
DC
(all other inputs at GND)
Sweep Time/cm
1 millisecond/cm
Slope
+
Source
Int.
Level
Auto.
5-70
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