Frequency Calibration Mode:
Frequency Calibration Mode
is used to fine tune the output
frequency to compensate for belt tension and other variables that may cause the platter to rotate
faster or slower than the indicated speed.
Frequency Calibration Mode
will adjust the base
frequency in 0.01RPM steps within a range of ±1.0 RPM.
Frequency Calibration Mode
has
separate adjustments for 33.3 and 45 RPM; both can be selected, displayed and adjusted while in
Calibration Mode
.
Enter
Frequency Calibration Mode
from
Standby Mode
by holding the
PLUS
button; press and
release the
Stby
button. The display will show
:
The display will then indicate the current speed selection (33.3/45.0) and start the turntable motor
rotating. The display will then show the current speed offset in 0.01 RPM steps; range is +0.99
to -0.99. The following indicates an offset of -0.15 RPM:
Increase or decrease the base frequency offset for the selected speed by pressing and releasing the
Plus
or
Minus
buttons until the exact turntable speed is indicated by a strobe device or tachometer.
Pressing and holding the
Plus
or
Minus
buttons will automatically increase or decrease the speed
at a rate of 8 times per second.
To select the other speed offset, press and release the
Stby
button. The display will show the newly
selected speed, then revert to the offset for that speed selection. Increase or decrease the base
frequency offset for the selected speed as above.
When frequency calibration is complete, press and hold the
Stby
button; the display will show
“SAV” and the frequency offsets will be saved in non-volatile memory. The PSU will then return
to
Standby Mode
.
