3712B
Temperature Controller Specifications (cont.)
Temperature Control
Temperature
~ange~~
Resolution and ~ccuracy'~
Temperature
-20 OC
0
OC
20
OC
50
"C
LM335 Setting Accuracy
AD590 Setting Accuracy
Short Term Stability3'
Long Term Stability
Sensor Type
Usable Thermistor Range
LM 335 Voltage
LM335 Bias
AD590 Current
AD590
Bias
Thermistor Sensing Current
Ternpcrature Calculation Methods
Thermistor:
-99
OC to +199 OC
-20 OC to +70 OC with typical 10K thermistor
Resolution
';"%ccura&
f0. 1 "C a.2 OC
.-- .
H.l OC
"'-
k0.2OC
fO.l OC H.2 OC
M.2 OC 53.2 OC
H.2 OC
H.2 OC
M.O1 OC or better, over 1
hr.
f0.1
OC or better,
over
24 hours
2-wire thennistor,ADS90 current
type;
or LM335
voltage
type
25
R
to 450
kR,
typ.
V(25 OC)
=
2980 mV; VT
=
10 mVI0K over rated sensor
range
1
mA
I(25 OC)
=
298.2 pA; IT
=
1
CLA/OK
over rated sensor range
+8
VDC
10
pA
or 100 pA (user selectable)
AD590 or LM335 calibrated with two-point method.
Termistors are calibrated by storing three constants of the
Steinhart-Hart equation in internal non-volatile memory.
In=
(Cl
*
loq3)
+
(C2
*
10-4)(ln
R)
+
(C3
*
10-')(ln
R)'
(T
in Kelvin)
T
=
C1
+
C2
*
(V/ (10 mVJ0K)
-
273.15)
T
=
C1+ C2
*
(I
/(1
@/OK)
-
273.15
3'~empernture control range depends primarily on the
type
of thermistor and
TE
module used. The range can be
extended higher and lower by selecting appropriate components. See Appendix
B
for more details.
36~ccuracy figures quoted are typical for a 10
kR
thermistor and 100 pA source current setting (10 pA source
current settlng at -20
OC.
Accuracy figures are relative to calibration standard. Both resolution and accuracy are
dependent on the user defined configuration of the instrument.
37S110n term temperature stability is a strong function of the thermal environment of
the
thermistor and
TE
module. Room air currents in particular can easily cause fluctuations of 0.1 OC in an exposed mounting
confrguratlon.
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