Campbell Scientific CR7 Measurement and Control System User Manual
Page 133
SECTION 13. CR7 MEASUREMENTS
13-9
TABLE 13.3-7. Source Resistances and Signal Levels for YSI #44032 Thermistor Configurations
Shown in Figure 13.3-7 (2V Excitation)
- - - A - - -
- B -
- - - C - - -
T
Rs
Ro
Vs(mV)
Ro@P
Ro
Vs(mV)
(kohms)
(kohms)
(kohms)
(kohms)
-40
884.6
29.0
164
30.0
1
5.5
-20
271.2
27
498
27.8
1
16.5
0
94.98
22.8
1200
23.4
1
39.5
+25
30.00
15.0
2500
15.2
1
82.0
+40
16.15
10.5
3250
10.6
1
106.0
+60
7.60
6.1
3989
6.1
1
129.5
3.
Where possible run excitation leads and
signal leads in separate shields to minimize
transients.
4.
AVOID PVC INSULATED CONDUCTORS
to minimize the effect of dielectric
absorption on input settling time.
5.
Use the CR7 to measure the input settling
error associated with a given configuration.
For example assume long leads are
required but the lead capacitance, Cw, is
unknown. Configure Rf on a length of cable
similar to the measurement. Leave the
sensor end open as shown in Figure 13.3-8
and measure the result using the same
instruction parameters to be used with the
sensor. The measured deviation from 0V is
the input settling error.
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