2 measurement programming – Campbell Scientific 247-L Conductivity and Temperature User Manual
Page 7
247 CONDUCTIVITY AND TEMPERATURE PROBES
3
FIGURE 4-1. 247 Wiring Diagram
5.2 MEASUREMENT PROGRAMMING.
EC Results from Instructions 5 or 6 (chosen
automatically as part of the autoranging feature
of the following program segment) are
processed with Instruction 59 to produce the
resistance across the electrodes:
Make a preliminary measurement of resistance
for autoranging.
01:
P6
Full Bridge
01:
1
Rep
02:
15
2500 mV fast Range
(Use 5000 mV fast for 21X)
03:
1
IN Chan
04:
1
Excite all reps w/EXchan 1
05: 2500
mV Excitation
(5000 mV for 21X)
06:
1
Loc [:Rs ]
07:
-.001
Mult
08:
1
Offset
02:
P59
BR Transform Rf[X/(1-X)]
01:
1
Rep
02:
1
Loc [:Rs ]
03:
1
Multiplier (Rf)
Test the preliminary measurement against each
case and make a refined measurement.
03:
P93
Case
01:
1
Case Loc Rs
04:
P
83 If Case Location < F
01:
1.8
F
02:
30
Then Do
05:
P5
AC Half Bridge
01:
1
Rep
02:
15
2500 mV fast Range
(Use 5000 mV fast for 21X)
03:
2
IN Chan
04:
1
Excite all reps w/EXchan 1
05: 2500
mV Excitation
(Use 5000 mV for 21X)
06:
1
Loc [:Rs ]
07:
1
Mult
08:
0
Offset
06:
P95
End
07:
P83
If Case Location < F
01:
9.25
F
02:
30
Then Do
08:
P6
Full Bridge
01:
1
Rep
02:
15
2500 mV fast Range
(Use 5000 mV fast for 21X)
03:
1
IN Chan
04:
1
Excite all reps w/EXchan 1
05: 2500
mV Excitation
(5000 mV for 21X)
06:
1
Loc [:Rs ]
07:
-.001
Mult
08:
1
Offset
09:
P95
End
10:
P83
If Case Location < F
01:
280
F
02:
30
Then Do