FRONT PANEL CALIBRATION POINTS
CALIBRATION POINTS
The PAL Plus MkIII has four points of calibration, all of which are found on the front panel.
They are:
•
GR TRK - Gain Reduction Tracking is to synchronize the GR meter with the VU meter.
•
VU ADJUST - Calibrated for the VU meter (top) in dBu. Factory is 0dB = +10dBu.
•
STEREO ADJUST - Balance for stereo operation (2 units) and Peak Reduction sensitivity.
•
GR ZERO ADJUST - Gain Reduction meter adjustment to 0dBu (100%) at rest.
Before attempting calibration of any of these parameters, please be sure you fully understand
each step of the process and have the necessary equipment to complete and verify the process.
GR TRK - CALIBRATION PROCEDURE:
The GR TRACK trimmer is used to adjust the tracking accuracy of the GR METER relative to the
amount of GAIN REDUCTION that is occurring in the audio.
•
Determine that GR ZERO ADJUST has been made (see GR ZERO ADJUST - CALIBRATION
PROCEDURE).
•
Allow 10 minutes of system warm-up time and 1 minute rest from peak reduction activity.
•
Set PEAK REDUCTION & LIMITER RESPONSE fully-counterclockwise.
•
Set OUTPUT LEVEL, LIMITER FEEDBACK fully-counterclockwise.
•
Set RATIO to 3:1
•
Inject a +10dB 1-kHz tone (2.45V). Verify level using an external DMM or suitable meter.
•
Increase OUTPUT LEVEL until the VU METER (top) reads 0dB.
•
Increase PEAK REDUCTION until the VU METER drops to -4dB.
•
The GR METER (lower meter) should now show -5dB. If not, use the GR TRK trimmer to ad-
just it until it reads -5dB. The additional 1dB is to compensate for meter ballistics of 300 milli-
seconds.
•
After adjusting GR TRK, turn off the 1-kHz tone and allow a 2-5 minute period of rest to ver-
ify that the needle returns to 100% or 0dB.
•
Since GR ZERO ADJUST and GR TRK are interactive, it may be necessary to repeat this proc-
ess (from step 6) a few times, readjusting GR ZERO ADJUST and GR TRK.
THE PAL PLUS MKIII
R e q u i s i t e A u d i o E n g i n e e r i n g! L2M MkIII
9
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