User Guide

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Digital Output Front Panel Controls
Clock Select
Pressing this switch allows you to select between sample frequencies of .kHz, 8kHz, 88.kHz, 6kHz, 76.kHz, and kHz.
EXT
Pressing EXT allows the ISA One to be slaved to an external word clock source. Selecting 56X allows the ISA One to be slaved to
an external clock running at 56 times faster than the sample frequency and enables connection to systems such as the Digidesign
‘Superclock’ or other 56X master clock devices.
Lock LED
When lit, LOCK indicates that ISA One is synchronised to an external word clock source.
Note: The LOCK LED does not light when synchronised to 56X, if digital audio is coming out of the ADC when synchronising to 56X
it is locked.
Recording a microphone
To record a microphone signal with ISA One, carry out the following steps:
Connect the microphone using an XLR cable, to the MIC I/P on the rear panel
Select MIC as the input source using the INPUT switch
If required, activate phantom power using the +8V switch. If you are unsure whether your microphone requires phantom
power, refer to its handbook, as it is possible to damage some microphones (most notably ribbon microphones) by providing
phantom power
Set the gain of the microphone using the two dials on the front panel and observing the VU meter or left hand LED meter. The
stepped gain sets the level in 0dB steps, with the Trim dial adding a further 0dB on top. If the level is too low, use the 0-60
switch to add 0dB to the gain range
Use the left-hand Z IN switch to adjust the input impedance if wanting to obtain more level or change the frequency response
(see the Mic Preamp Input Impedance section for details)
Activate the HPF and Phase reverse switches if required (consult the Front Panel section for details)
The microphone signal will then be sent to the MAIN O/P on the rear panel, as well as to the rst channel of the ADC (if installed).
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Clock Select
Lock LED
Ext Sync