Firmware Commands
B-5
SDC
S
et
D
ead-time
C
orrection
This command controls the amount of correction that is applied to the instrument’s
measured dead-time. The UWCPC measures the dead-time by measuring the time a
particle signal exceeds a preset threshold. This value is slightly under reported since
the particle signal is of Gaussian shape and the digitized threshold value is less than
the time to which the next particle could actually be detected. The actual dead-time
value used in the UWCPC is the measured dead-time value multiplied by this factor
(in percent).
Command:
SDC,x
Command to set dead-time correction
x= 0 to 200 in units of percentage
Response:
OK
Example:
SDC,110
Command sets dead-time correction to 110%
OK
Response
SDC
Command
110
Response
SDM
S
et
D
rain
M
ode
This command sets the reservoir drain/recycling mode of the instrument. There are 5
drain modes which are described as follows:
Mode Description
0 or 1 Manual Drain—Setting the drain mode to 1 will initiate a drain cycle. Once the
one minute cycle is complete the drain mode will automatically be switched
back to the previous setting. Setting the drain mode to 0 will cancel any
current drain cycle. In this mode, the reservoir can be drained when initiated
by the front panel drain button or setting the drain mode to a non-zero value.
2
Recycle Mode—Setting the drain mode to 2 allows the WCPC to recycle water
from the reservoir back into the WCPC. When the reservoir is full, the drain
flag will be set along with a front panel indication that the reservoir is full. If
the reservoir remains full for one hour, the instrument will halt both water and
air-flow pumps waiting for the reservoir to be emptied.
3
Recycle/Auto Drain Mode—Setting the drain mode to 3 allows the WCPC to
recycle water from the reservoir back into the WCPC. This mode is similar to
mode 2 except that when the reservoir is detected as full, a drain cycle is
automatically initiated.
4
Auto Drain Mode—Setting the drain mode to 4 causes the WCPC to
automatically initiate a drain cycle once a full condition is sensed in the
reservoir.
5
Continuous Drain Mode.
