AM25T Solid-State Thermocouple Multiplexer
10
Short Cut
cannot edit programs after they are imported and edited
in
CRBasic Editor
.
If there is a need to import
Short Cut
code into the
CRBasic Editor
to create or
add to a custom program, follow the procedure in Appendix
A
,
Importing Short
Cut Code Into CRBasic Editor
(p. A-1)
. Programming basics for CRBasic
dataloggers are provided in the following section. A complete program
example for a select datalogger can be found in Appendix
B
, Example Program
(p. B-1)
.
8.2.1 CRBasic Programming
In CRBasic, the
AM25T()
instruction is used to control the AM25T
multiplexer with the datalogger. The instruction measures the PRT
incorporated in the AM25T and uses it as a reference temperature for
thermocouple measurements. The
AM25T()
instruction and parameters are as
follows:
AM25T
(Dest, Reps, Range, AM25TChan, DiffChan, TCType, TRef,
ClkPort, ResPort, ExChan, RevDiff, SettlingTime, Integ/f
N1
, Mult,
Offset)
For information on this instruction, refer to the CRBasic Help.
9. Maintenance
Maintain a level of calibration appropriate to the application. Campbell
Scientific recommends factory recalibration of the AM25T every five years.
Consider the following factors when setting a calibration schedule:
•
the importance of the measurements
•
how long the multiplexer will be used
•
the operating environment
•
how the multiplexer will be handled
U6
U5
Datalogger
AM25T
Power
Supply
12V
G
U1
U2
U3
Control
Ports
Excitation
Analog
Input
12V
G
CLK
RES
VX
HI
LO
12V
O
U
T
1
Analog Ground is the
terminal between
VX
and
Hi
on the AM25T
1
NOTE
1
Analog Ground is the
⏚
terminal between
VX
and
HI
on the AM25T.
