Antec Scientific ROXY Exceed, Руководство пользователя, Страница: 105 / 126

CHAPTER 9 Rear panel I/O 105
Fig. 53. Example of a current signal were the cell current exceeds the
maximum current level and the signal is ‘out of range’.
If for instance the cell current goes in out of range during the recording of
an response of the conversion of a target compound, it can be (in most
cases) easily recognized by a flat top of the peak and a very abrupt transi-
tion to the flat top at the edges.
By default the status of the overload output is
‘high’ 3.3V. When the cell
current has the status ‘out of range’ the overload output will change status
to
‘low’ 0 Volt, until the cell current returns to a value within the measure-
ment range again. The overload output (pin 11) is one of the configurable
I/O’s.
The configurabl
e I/O’s can be programmed in the IO menu, which is a sub-
menu of the CONFIG menu. By default, the overload output is assigned to
cell 1:
‘P11 (OVLD) = 1’. This means that only when the cell current of cell
1 is ‘out of range’ the status of the overload output will change to ‘low’ 0V.
For all other cells present in the ROXY Exceed (in case of a DCC version
of the instrument) an out of range situation will not trigger a response on
pin 11.
P 1 1 ( O V L D ) = 1 P 1 8 ( A Z E R O ) = 1 I O
P 1 2 ( C - O N ) = A L L P 2 1 ( S T A R T ) = A L L
P 1 5 ( C - O F F ) = 2
P R E V
It is important to recognize an
‘out of range’ (overload) situation,
because it may lead to erratic results when quantifying analyte
concentrations in samples.