k. Turn on the SG 505 output.
I. Press the
IMD pushbutton and release the 400 Hz HI
PASS pushbutton.
m. ADJUST-R1001, SMPTECal, for a display reading
of
lo.OOO/o.
n. Leave this setup for the next step.
11. Adjust Diff Freq Cal (Option 01)
NOTE
CClF distortion is referenced to the level of either
component of two equal amplitude test tones. The
following procedure simplifies test instrumentation
requirements and minimizes sources of potential
error by omitting one of the two test tones. Because
only one test tone is present the averaging response
of theinternal automaticset-level circuitry will cause
readings to be high by a factor of exactly
1.273
(4-rr).
If desired, the alternate procedure given in
step
11A
may be followed. This procedure provides
two equal amplitude test tones. However, it requires
an additional
SG
505 or equivalent oscillator and
extra cabling.
i.
ADJUST-R1421. Diff Freq Cal, for a display reading
of 12.73%.
j.
This completes the AA501 Internal Adjustment
procedure.
11A. Adjust Diff Freq Cal (alternate procedure, omit
if
step 11 is performed, Option 01 only)
a. Connect the test equipment as shown in Fig. 4-9.
b. Set the INPUT LEVEL RANGE switch to the AUTO
RANGE position.
c.
Make certain the VOLTS, LEVEL, 20°/0, and response
pushbuttons are in. All other pushbuttons out.
d. Turn off both SG 505 outputs. Make certain both
outputs are floating.
e. Adjust the SG 502 for a 250 Hz, 4.24
mV output
signal as read on the AA 501 display.
1. Press the 400 Hz HI PASS pushbutton.
a. Connect the test equipment as shown in Fig.
4-6.
b. Set the INPUT LEVEL RANGE switch to the AUTO
RANGE position.
c. Make certain the VOLTS, LEVEL,
20°/0, and RE-
SPONSE pushbuttons are in. All other pushbuttons out.
d. Turn off the SG 505 output. Make certain the
lM test
signal is off. Float the output.
g. Turn on one SG 505 output and adjust this SG 505
for an output frequency of 14 kHz, with an amplitude of
42.4
mV as displayed on the AA 501.
h. Turn off this SG 505 output and turn on the
remaining SG 505 output.
i. Adjust this SG 505 output for afrequency of 15 kHz,
with an amplitude of 42.4
mV as displayed on the AA 501.
j.
Turn on the first SG 505 output and note that the
e. Adlust the SG 502 for
a
250 Hz, 6.00 mV output
composite amplitude is approximately 60 mV.
signal as indicated on the AA 501 display.
f.
Press the 400 Hz HI PASS pushbutton.
k. Press the IMD pushbutton and
releasethe400 Hz HI
PASS pushbutton.
g. Turn on the SG 505 output and adjust for an output
I.
ADJUST-R1421, Diff Freq Cal, for a display reading
frequency of 14 kHz, and a 60
mVoutput signal amplitude
of
10,OOo~o~
as displayed on the AA 501.
h.
Press the IMD and release the 400
Hz
HI PASS
m. This completes the AA 501 Internal Adjustment
pushbuttons. procedure.
4-22
REV
JUN
1981
Scans
by
ARTEK
MEDL4
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