Prism
Operation Manual Issue 2.00
Page 6.10
6.1.7.
Phase v Ref (menu 1.7.)
This selection measures the phase of the selected DI input signal with respect to the
reference REF SYNC signal. The DSA-1 automatically selects whichever REF SYNC
input is in use and also differentiates between Wordclock (SDIF-2) and AES11 format.
If a Wordclock-type reference is used, the in-phase state is when the starting transition
of the carrier's X-preamble coincides with the rising transition of the Wordclock. The
display shows the phase offset in percent (according to the interface standard) or in
degrees; the units are selected with the [EDIT/CLEAR] key. A positive reading
represents the test signal lagging the REF SYNC:
Phase wrt Ref
= - 1.6%
To return to the `Carrier Tests' level of the menu system, press [EXIT].
6.1.8.
CM Ampl (menu 1.8.)
This selection measures the common mode voltage present for the balanced XLR input
format. If either co-axial or optical inputs are selected no result is displayed.
The result displayed is the peak-to-peak range of the mid-voltage of pins 2 and 3, with
respect to pin 1:
Commonmode Ampl=
70mV [P-P]
This measurement is useful for detection of cabling faults, as further described in
section 8.
To return to the `Carrier Tests' level of the menu system, press [EXIT].
6.1.9.
LoBand Ampl (menu 1.9.)
This selection measures the peak-to-peak analogue audio-bandwidth (28Hz to 20kHz)
signal voltage on either the balanced or coaxial DI input. If the optical input is selected,
no reading is displayed:
Audio-band Ampl=
140mV [P-P]
To return to the `Carrier Tests' level of the menu system, press [EXIT].
6.1.10.
Log Carrier (menu 1.10.)
