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Section III
Model
DRC-93C
(sensor plus instrument) versus sen-
In other words, only five digits can
sor sensitivity.
be displayed.
3 . 8 . 7 . 1
Temperature Display Resolu-
In the temperature mode, the chosen
tion Set
input is displayed in the selected
scale
(K,
"C o r
°F)
with a maximum
To examine the resolution of the
display capability of
0 . 0 1
degrees
Upper and Lower Display hold in the
above
100
kelvin, to
0.001
degrees
RSLTN
key.
The displays will read
between
1
and
100
kelvin and in the
one of the following:
case of the 9317C resistance card to
0.0001
kelvin
( 0 . 1
millikelvin)
I
I
below
1
kelvin.
Please note that
-
----
this is display capability and =it-
her
system resolution
nor
necessari-
If it is desired to change the res-
ly accuracy of the reading.
Also
olution then while holding down the
note that if the sensitivity of the
RSLTN
key hit the
key to cycle
sensor is too low to support this
the resolution in the Upper Display
resolution, i.e.,
one
bit
cor-
through those shown until the desi-
responds to greater than the above
red resolution is obtained.
When
resolution, some temperatures may be
the keys are released the new res-
skipped.
This will be true for a
olution is entered in the DRC-93C.
silicon diode
sensor between
30
Similarly, holding in the
RSLTN
key
kelvin and
100
kelvin where the
and hitting the
key will change
sensitivity
i s approximately
2.5
the resolution in the Lower Display.
millivolts per kelvin and the volt-
age resolution i s
0 . 0 4 6
millivolts.
Changing
the
display
resolution
For this case, the resulting temp-
fixes the
resolution transmitted
erature resolution is
0.046/2.5
=
over the computer interface as well
0 . 0 1 8
kelvin.
However
,
below
3 0
but does not change the resolution
kelvin the silicon diode sensitivity
of the "system". Display resolution
is approximately
25
millivolts per
can also be different for each input
kelvin which results in an approxi-
card, i.e.
,
A and
B.
Also note,
mate
resolution of
0.002
kelvin
that the chosen resolution will only
(0.046/25).
be displayed when "appropriate".
---
-
---
-- ---
--
---
. ,
.
I
TABLE 3-1.
System Resolution
V e r s u s Sensor
Sensitivity
Sensor
Maximum Temperature
Sensitivity Resolution (in kelvin)
Voltage Mode
9210/9220
mv/K
-3 1
-6
1
0 . 1
0 . 5
1 .
1 . 0
0.05
0 . 1
10.0
0.005
0.01
100.0
0.0005
0 . 0 0 1
Sensor
M a x i m u m Temperature
Sensitivity Resolution (in kelvin)
Resistance Mode
9317C/9318C
(1/R) (dR/dT)
,
K-1
9220-P2
,
-P3
,
-R1 2
0.001
0 . 1
to
0 . 0 1
0.01
0 . 0 1
to 0.001
0 . 1
0.001
to
0.0001
1 .
0.0001 to
0.00001
Note
1 .
Note
2.
The input resolution is
0.05
millivolts for the
9210/9220-3
and is
0 . 1
millivolts for the
9210/9220-6.
This assumes an ability to resolve between
1
part in
and
10 4
1
part in
,
where
=
[
(1/R) (dR/dT)
]
and
(
10 5
varies between
10
-4 and
10
-5
3 -8
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3/88
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