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d. Adjust the oscilloscope trigger level control for a
stable display of approximately 1 cycle per division.
e. CHECK — that the display stops changing frequency
within ±.5 minor division of the 10 mark as the
QUENCY Hz dial is adjusted back and forth around 10.
( or ease in viewing the change in frequency, position the
waveform so the trailing edge can be observed.)
f. Disconnect the 50 Ω cable and termination from the
oscilloscope vertical input.
2. Square Wave Aberrations and Symmetry
a. Set the G 501 controls as follows:
UNCTION
AMPL 1
O
SET 2
PHASE
MULTIPLIER
REQ VERNIER
REQUENCY Hz
b. Set the oscilloscope for a dc-coupled vertical input
at 1 V/div sensitivity and a sweep speed of .05 jus/div.
Trigger on + slope.
c. Connect the
G 501 OUTPUT through a 50 Ω
coaxial cable and a 50 Ω termination to the oscilloscope
vertical input.
d. Adjust the test oscilloscope trigger level control to
display the entire rising portion of the square wave.
e. Adjust the G 501 O
five-division display (2.5 divisions above and below the
graticule centerline).
f. Adjust the
G 501 high frequency compensation
(C281 ) for a risetime of approximately 70 ns (10% to 90%).
' Below $N B130000 AMPL control Is labeled OU PU .
or SN below B1 30000 set OFFSE to zero.
REV A, MAR 1979
RE
Square Wave
ully cw
In
In
10 5
ully cw
8.0
SET and AMPLcontrolsfora
Specification and Performance Check — FG 501
g. Adjust the test oscilloscope trigger level to display
the entire falling portion of the square wave. Check that
the falltime is approximately 70 ns. Readjust C281 (if
necessary) to balance risetime and falltime.
h. Set the oscilloscope time/div to .5 jus/div. Check
that aberrations on the positive and negativefront corners
of the square wave are less than 5%.
i. Set the oscilloscope vertical sensitivity to 1 V/div.
j. Adjust the oscilloscope sweep speed and variables
to display one full cycle of the square wave in 10 divisions.
k. Set the oscilloscope X10 sweep magnifier on.
Position the square-wave center voltage transition to
exact display center.
l. Change the trigger polarity from + slope to — slope.
m. CHECK — that the center transition of the display
does not shift horizontally more than 1 division (within
1%).
n. Disconnect the 50 Q cable and 50 Ω termination.
3. Basic iming
a. Set the G 501 controls as follows:
UNCTION
AMPL 1
O
SET 2
PHASE
MULTIPLIER
REQ VERNIER
REQUENCY Hz
b. Connect a 50 Q coaxial cable and 50 Ω termination
from the G 501 OUTPUT to the frequency counter input.
Triangle
ully cw
Off (in)
In
10 5
ully cw
10 (exactly)
2-7
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