4.2 Cancelling the dark current of sensor
CA5350
4-4
4.2.1 Manually setting the current value to be cancelled
Setting the range
Set from Menu
CURRENT SUPPRESSION
–ON–MANUAL–RANGE
.
C U R R E N T
S
S U P P R E S S I O N
S
R A N G E
S
±
8 0 0 u A
Select the range with
▴ ，
▾
keys or knob, and apply by the
ENTER
key. Setting will
not be changed unless the
ENTER
key is pressed. Setting range is available in 6 ranges
of
8nA/80nA/800nA/8µA/80µA/800µA
.
Setting the current value
Set from Menu
CURRENT SUPPRESSION
–ON–MANUAL–VALUE
.
C U R R E N T
S
S U P P R E S S I O N
S
V A L U E
S
+ 8 0 0 . 0 u
A
A
The figure above is the example of
800µA
range, and the underline cursor appears in the
digit of 1µA. Numerical value of the digit selected with underline cursor can be
increased or decreased in one step by pressing the
▴ ，
▾
keys or rotating the knob.
Changing the numerical value will immediately change the current.
4.2.2 Automatically deciding the current value to be cancelled
This function sets the range required for eliminating dark current from sensor and it
automatically sets the current value. It is used when sensor is connected to the source of
signal.
Auto suppression current will automatically renew the current value and range of
CURRENT SUPPRESSION
to the value selected through auto suppression current, and
output voltage will be almost 0V. Current range and value set earlier will be lost. If
settings need to be saved, be sure to save them in the setting memory before running
auto current suppression.
For the saving the setting
“4.4 Saving/Recalling the Settings”
Select
AUTO
from the Menu
CURRENT SUPPRESSION
–ON
, and press the
ENTER
key
to run auto current suppression.
C U R R E N T
S
S U P P R E S S I O N
S
A U T O
*
M A N U A L
The following will appear on LCD when current value searched as a range.
C U R R E N T
S
S U P P R E S S I O N
S S
A U T O
S
S R C H
During auto current suppression, an irregular voltage with the value in range of -15 to
15V will be output to the output terminal of
CA5350
.
