 |
|
AUTOMATIC
THERMOMETER BRIDGE
RESISTANCE THERMOMETRY |
|
|
|
Senator Multi-Range Automatic Thermometry
Resistance Bridge
Type 5840D |
|
|
5840D Thermometry
Resistance Bridge
The SENATOR
Thermometry Resistance Bridge is a multi-range Automatic Resistance Thermometer
Bridge. Using the well proven inductive division principle with
unique circuitry, the SENATOR provides accurate AC measurement of
resistance up to 1100 Ohms for high precision temperature
applications to 1 millidegree. No initial setting-up is required and
calibration may be readily verified using suitable certified
resistance standards such as the 5685 range.
|
|
|
3 Ranges |
|
Choice of
currents |
|
Direct
reading in Ohms |
|
Readout in
temperature
K or °C (via computer) |
|
IEEE-488
interface |
|
1mΩ
resolution |
|
Low
frequency operation 75Hz |
|
Recorder
output |
|
Self
balancing |
|
Ratio Mode |
|
|
|
|
|
|
|
|
5840D Automatic Thermometer Bridge
Technical Data
|
|
|
Resistance - Temperature
Readout
Precise true resistance
measurement is clearly displayed on the high-stability digital readout
with a resolution of 1mOhm on the 10 Ohms
range. The reading can also be transferred over the IEEE-488 interface
to a computer controller for temperature conversion. The resultant
temperature calculation is then sent back for display on the SENATOR
front panel in units of K or C. Suitable software is available from
Tinsley to convert the AC resistance measurement into temperature and
to calculate the constants of 25 Ohms Platinum Thermometers from
ITS-90 Resistance-Temperature data.
|
3 Resistance Ranges - Applications
The built-in range selection of 10 Ohms,
100 Ohms and 1 kOhm is very desirable and renders the SENATOR ideal
for use in a wide range of applications for high precision
temperature measurements.
1.
The 10 Ohms range is ideal for
use with Rhodium Iron Thermometers, Tinsley type 5187U and 5187W and
for capsule 25 Ohms Platinum Thermometers, Tinsley type 5187L.
2.
The 100 Ohms range is the most
suitable for long stem 25 Ohms Platinum Thermometers such as Tinsley
type 5187SA.
3. The 1000 Ohms range is selected
for 100 Ohms Platinum Thermometers above 0°C.
|
Specifications
|
|
RANGE
|
CURRENT
ma +/- 1% |
ACCURACY
relative to Calibration Standard |
Resolution |
| Selected |
Measured |
| 10Ω |
0 to 16Ω |
0.2
0.5
1.0
2.0
5.0
10.0 |
5ppm+/-
5mΩ
3ppm+/- 3mΩ
2ppm+/- 2mΩ
2ppm+/- 2mΩ
2ppm+/- 2mΩ
2ppm+/- 2mΩ |
1 mΩ |
| 100ΩΩ |
0 to 160Ω |
0.2
0.5
1.0
2.0 |
2ppm+/-
20mΩ
1ppm+/- 10mΩ
1ppm+/- 10mΩ
1ppm+/- 10mΩ |
10 mΩ |
| 1000Ω |
0 to 1600Ω |
0.2
0.5
1.0 |
5ppm+/-
100mΩ
5ppm+/- 100mΩ
5ppm+/- 100mΩ |
100 mΩ |
| 'Self Heating Check' Current -
1.414 X Selected current |
Internal Standards -
10Ω,
100Ω. and
1000Ω
with trim adjusters for calibration to a certified standard
resistor. |
| Zero Stability -
Negligible drift with time and temperature |
External Standards - The bridge
will read ration Rx to 10Ω,
100Ωand
1000Ω standard resistors. |
Calibration Drift - 1ppm /
year - Internal Standards,
0.25ppm / year - External Standards |
Quadrature Balance - Fully
automatic balance of thermometer reactance with visual indication
if overloaded. |
| Self-Balance Speed - 10 seconds
from unknown resistance to 1ppm accuracy. (100Ω range) |
Power Requirements - 115/230
Volts; 50/60 Hz, 250 VA. |
| Accuracy - Better than 0.5
millidegree at 0°C (for 25W PRT's) |
Net weight - 16Kgs; Dimensions
- 480 X 160 X 400mm. |
|
