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D. Check the actual tracking force with the Shure SFG-2 Stylus Force Gauge
by placing the gauge in position on the turntable or, if the turntable is not
suitably flat, on a record on the turntable. Position the stylus tip into the
appropriate groove on the force gauge lever arm for the desired range:
"times 1" or "times 2," then move the rider weight to balance the gauge,
which indicates the actual tracking force at the stylus tip; re-adjust stylus
force setting if necessary.
E. Set antiskating to the recommended value of the tone arm manufacturer.
d
n
STYLUS FORCE GAUGE
V. CHANNEL ORIENTATION, CROSSTALK,
AND BALANCE TESTS
A. Channel Orientation
Set up equipment as shown in Section Ill.
Place the Shure TTR-109 on the turntable.
THIS IS a
33% RPM RECORD. Set the car-
tridge playing conditions per Section IV.
Press the "Left" button on the test panel and
play Band I, 3 or 5 for the left channel. You
should observe a vertical line (Fig. 16) on the
scope. Play Band 2, 4 or 6 for the right chan-
nel, and press the "Right" button on the test
panel. You should observe a horizontal line
(Fig. 17). If the results are reversed, the
channels have been reversed. If necessarv.
reverse the leads from the changer s i t6e
proper orientation is obtained.
Fig. 16
Crosstalk
To measure 1 kHz crosstalk, depress the
"Left" button on the test panel and play a
left channel band of the TTR-109. Adjust the
"Zero Adjust" control until the meter reads
"0."
Depress the "Crosstalk" button, and the
meter will indicate the left to right crosstalk
relative to a signal 20 dB below the left chan-
nel output. For example: a reading of -5 dB
on the meter with the "Crosstalk" button de-
pressed would indicate a crosstalk signal 25
Fig. 17
dB down from the left channel output, where-
as a reading of +2 dB would indicate a
crosstalk signal 18 dB down from the main
channel. Meaningful crosstalk measurements
can be made for signals down as much as
30 dB.
The right to left channel crosstalk may be
measured by repeating the above test with the
"Right" button depressed and playing a right
channel band of the TTR-109.
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