Digital Teslameter 133

The DTM-133 Digital Teslameter offers accurate, medium resolution measurement of magnetic flux densities at an economic price.

Features

  • Temperature coefficient is 80 ppm / ° C when used with LPT-130, or 140 ppm / ° C when used with MPT-132 probe.
  • Accuracy and temperature specifications include performance of probe.
  • Because the probe characterisation information is stored in the probe assembly itself, any Group3 probe can be used with any Group3 DTM.
  • 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.
  • Digital filtering (time averaging) can be enabled to suppress short term fluctuations.
  • Several teslameters with the serial communications option (up to 31) 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.
  • An analog output is available. This is a buffered version of the raw probe signal, and is not corrected for linearity or temperature. It offers an instantaneous field value, (0 to 9kHz)
  • 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.
  • The operating temperature range of the probe and instrument is 0 to 50 ° C

Quick Facts

  • Resolution of 1 part in 12,000
  • 4 ranges
  • Maximum field 3 Tesla
  • 6 digit display (5 digit, plus sign)
  • optional RS232 or IEEE488/GPIB communications.
  • Accuracy is ± (0.03% of reading + 0.03% of full scale) with LPT-130 or MPT-132 probe.

Specifications

DTM-133 performance summary when combined with the listed probe

Active area (mm)

Resolution of display

Max field

Finest resolution

Accuracy at 25° C

Tempco ppm /°C

zero drift µT/°C

LPT-130

4 x 1.6

1 in 120,000

3T

50µT

± 0.01%

-80

± 12

LPT-230

4 x 1.6

1 in 12,000

0.3T

5µT

± 0.03%

-620

± 8

MPT-132

1 x 0.5

1 in 12,000

3T

50µT

± 0.03%

-140

± 40

MPT-230

1 x 0.5

1 in 12,000

0.3T

5µT

± 0.03%

-620

± 8

The following specifications refer to DTM-133 with LPT-130 probe (standard size probe).

DTM-133 with MPT-132 probe (miniature probe)

Four ranges, selectable from front panel:

0.3
0.6
1.2
3.0 tesla full scale

Note: Resolution depends on the range selected.

DTM-133 with LPT-130 probe

Range selected

Resolution (µT)

0.3 tesla

50

0.6 tesla

100

1.2 tesla

200

3 tesla

500

Absolute Accuracy

0.03% of reading ± 0.03% of range at 25° C

Temperature Stability with LPT-130 probe

  • scale factor: -80 ppm of reading / ° C max.
  • Zero drift: ± (12m T + 0.0015% of full scale ) / ° C max.
  • Effect of probe cable: Add -3ppm / ° C for each metre of probe cable.

Temperature Stability with MPT-132 probe

  • scale factor: ± (40m T + 0.0003% of full scale ) / ° C max.
  • zero drift: ± (15m T + 0.0010% of full scale ) / ° C typical. ± (40m T + 0.0015% 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