Digital Teslameter 151 (DTM-151)
Digital hall effect teslameter - gaussmeter
The DTM-151 Digital Teslameter offers extremely accurate, high resolution measurement of magnetic flux densities.
Features:
- High accuracy - fully temperature compensated.
- Resolution of 1 part in 600,000
- 4 ranges
- Maximum field 3 Tesla
- 7 digit display
- Either RS232 or IEEE488/GPIB communications.
- Accuracy is 0.01% of reading + 0.006% of full scale when used with MPT-141 probe.
- Temperature range for instrument and probe 0 to 50° C
- Because the probe characterisation information is stored in the probe assembly itself, any Group3 probe can be used with any Group3 DTM. However for full accuracy the DTM-151 should be used with a probe that has temperature compensation circuitry.
- Two buttons on the front panel are used to select the operation of the teslameter. The following modes can be selected for the display - magnetic field, peak hold of magnetic field, AC component of field, probe temperature.
- Digital filtering (time averaging) can be enabled to suppress short term fluctuations.
- Several teslameters (up to 31) with serial communications can be formed into a local communications loop, all of them talked to by the one serial port on the control computer. The system can be operated in a trigger mode, where the timing of the measurements by several teslameters can be synchronised
- Internal switches select serial data format, baud rate, device address, string terminators, filtering, gauss or tesla units, data format, service request action, EOI action, and reset system to defaults
- Two analog outputs are available. These are a buffered version of the raw probe signal, and are not corrected for linearity or temperature.
- All models are available without display or front buttons, for true "Black box" requirements.
- Panel mount versions are available, and panels with correct cut-outs and mounting hardware.
DTM-151 Specifications
| Probe | Active area (mm) | Resolution of display | Max field | Finest resolution | Accuracy at 25° C | Tempco ppm /°C | zero drift µT/°C |
|---|---|---|---|---|---|---|---|
| LPT-141 | 4 x 1.6 | 1 in 600,000 | 3T | 1µ T | ± 0.01% | ± 10 | ± 1 |
| LPT-231 | 4 x 1.6 | 1 in 600,000 | 0.3T | 0.1µ T | ± 0.03% | ± 25 | ± 1 |
| MPT-141 | 1 x 0.5 | 1 in 600,000 | 3T | 1µ T | ± 0.01% | ± 10 | ± 1 |
| MPT-231 | 1 x 0.5 | 1 in 600,000 | 0.3T | 0.1µ T | ± 0.03% | ± 25 | ± 1 |
The following specifications refer to DTM-151 with LPT-141 probe (standard size probe)
DTM-151 with MPT-141 probe (miniature probe)
Ranges
4 ranges, selectable from front panel
- 0.3
- 0.6
- 1.2
- 3.0 tesla full scale
Note: Resolution depends on the range selected, and whether the digital filtering is enabled.
Note: Resolution available at the serial⁄GPIB port is greater than that of the display.
| Range selected | Resolution (µ T) Display | Resolution (µ T) serial/GPIB |
|---|---|---|
| 0.3 tesla | 1 | 0.1 |
| 0.6 tesla | 2 | 1 |
| 1.2 tesla | 4 | 1 |
| 3 tesla | 10 | 1 |
| Range selected | Resolution (µ T) Display | Resolution (µ T) serial/GPIB |
|---|---|---|
| 0.3 tesla | 5 | 0.1 |
| 0.6 tesla | 10 | 1 |
| 1.2 tesla | 20 | 1 |
| 3 tesla | 50 | 1 |
- AbsoluteAccuracy
- ± 0.01% of reading ± 0.006% of range at 25° C
- Temperature Stability
-
- scale factor: ± 5 ppm of reading / ° C typical, ± 10 ppm of reading / ° C max.
- zero drift: ± (1m T + 0.0003% of full scale ) / ° C max.
- Effect of probe cable: add -3ppm / ° C for each metre of probe cable.
- Frequency
- DC, or in AC mode 8 to 3,000 Hz
- Update rate
- 10 fully corrected measurements per second
- Display
- 7 digit, red LED. 8 additional indicators for range, units, peak hold and filter
- Enclosure
- All metal, with tilt stand on bench models, bezel mount on rack models
- Dimensions
- 217 x 125 x 50mm , weight 1.2 kg