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Calibrating the D/A Converter
1. Use an external source to provide digital signal to the D/A.
2. Verify that D/A SYNC is correct and locked.
3. Ensure that DIP switch 4 (Output level) is set correctly:OFFfor +4dBu, ONfor –10 dBV
4. Using a ‘tweaker’ or small flathead screwdriver, rotate the left and/or right trimpot in a clockwise direction
to increase gain of the D/A. It is not necessary to use a non-conductive tool.
Calibrating the A/D Converter
1. Ensure that DIP switch 5 (Input level) is set correctly:OFFfor +4dBu, ONfor –10 dBV.
2. Using a ‘tweaker’ or small flathead screwdriver, rotate left and/or right trimpot in a clockwise direction to
increase gain of the A/D. It is not necessary to use a non-conductive tool.
Using the AUX Output
The AUXconnector on the rear of the PSX-100 is an auxiliary AESoutput which, when available, always deliv-
ers full 24-bit resolution. It was originally designed to allow easy connection of an external, high-accuracy digi-
tal meter for mastering and monitoring applications; however it also has other uses.
The AUXoutput is essentially the same signal as appears at the INPUTof the D/A Converter in the PSX-100. If
you bear this in mind when you wish to use the AUXconnector, you won’t go far wrong.
The AUXoutput is available at 88.2/96 kHz sample rates (FASTmode), but it will only output every other sam-
ple, at 44.1/48 kHz. This may be fine for metering, but the filtering will be wrong for accurate 44.1/48 kHz
recording and we do not recommend its use for recording purposes in FASTmode.
Typical Applications
Metering
While using the PSX-100 A/D and D/Ain Confidence Mode, for example wrapped around a digital recorder, the
AUXoutput can be used to connect an external metering system for increased accuracy. The AUXoutput deliv-
-
ers the same signal as is present at the D/Ainput, so you will need to insure that a useful signal is being returned
d
to the D/A inputs from the recorder, or this output will not work!
Recording a 24-bit signal while simultaneously recording one or more 16-bit signals
The AUXoutput is always operating at full 24-bit resolution. As a result, you can connect it to the AESinput of
a 24-bit recorder such as the Tascam DA-45HR while you have the main outputs set to 16-bit UV22HR – the lat-
ter being sent to, for example, one or more 16-bit DATmachines. It is tempting to use Confidence Mode for
r
this purpose… you can’t!Confidence Mode separates the A/Dand D/A, and the AUXoutput is the same as the
he
D/A input, so if you feed the output of the DA-45HRto the D/A input and the AUXoutput to the DA-45HRinput
t
you will in fact be creating a feedback loop!
The solution is to use Analog Monitor Mode. In this mode, the A/Dfeeds both the main outputs and the AUX
X
output; the AUXoutput is always 24-bit; and you can simultaneously use UV22HR on the main outputs. In addi-
-
tion, the D/Ais fed from the A/Das well, so if you monitor the D/A output you will simply be listening to the
A/D converter. Note that you will need to switch outof Analog Monitor Mode to replay the recorded signal,
l,
and you should temporarily disconnect the path from the AUXoutput at the same time to avoid a feedback
loop when you are not in replay on the DA-45HR.
You can, incidentally, use the DA-45HR locked to the PSX-100 crystal at all times, using the Word Clock output
from the PSX-100. This will insure that you do not lose sync when the AUXoutput ceases to generate useful
output in Confidence Mode (which would be the case if you were relying on the AESsignal for sync).
PSX-100 User’s Manual
Page 20
