Digital Teslameter 151

The DTM-151 Digital Teslameter offers extremely accurate, high resolution measurement of magnetic flux densities.

Features

  • 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.

Quick Facts

  • 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

Specifications

DTM-151 performance summary when combined with the listed probe.

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 1µT ± 0.01% ± 10 ± 1
LPT-231 4 x 1.6 1 in 600,000 0.3T 0.1µT ± 0.03% ± 25 ± 1
MPT-141 1 x 0.5 1 in 600,000 3T 1µT ± 0.01% ± 10 ± 1
MPT-231 1 x 0.5 1 in 600,000 0.3T 0.1µT ± 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)

Four ranges, selectable from front panel:

1. 0.3
2. 0.6
3. 1.2
4. 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.

DTM-151 with LPT-141 probe Filtering ON

Range selected

Resolution (µT) Display

Resolution (µT) serial/GPIB

0.3 tesla

1

0.1

0.6 tesla

2

1

1.2 tesla

4

1

3 tesla

10

1

DTM-151 with LPT-141 probe Filtering OFF

Range selected

Resolution (µT) Display

Resolution (MT) serial/GPIB

0.3 tesla

5

0.1

0.6 tesla

10

1

1.2 tesla

20

1

3 tesla

50

1

Absolute Accuracy

± 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