DS Model (Bench, Serial)
Resolution of 1 part in 12,000
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.
Panel Mount, GPIB
D T M - 1 3 3 - D S
DTM - Digital Teslameter
D - Bench Top
P - Panel Mount
151 - With Temperature Compensation
133 - No Temperature Compensation
152 - With Temperaure Compnesation,
333 - No Temperature Compensation, 3-Axis,
3-Channel, Touch Screen Display
S - Serial RS232
G - GPIB, IEEE-488
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
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 Zero Drift
ppm /°C µT/°C
LPT-130 4 x 1.61 in 1 in 120,000 3T 50µT ± 0.01% ± 80 ± 12
LPT-230 4 x 1.61 in 1 in 12,000 0.3T 5µT ± 0.03% ± 620 ± 8
MPT-132 1 x 0.51 in 1 in 120,000 3T 50µT ± 0.03% ± 140 ± 40
MPT-230 1 x 0.51 in 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 LPT-130 PROBE (LIMPET PROBE)
Four ranges, selectable from front panel:
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-133 with LPT-130 probe Filtering ON
Range selected Resolution (µT) Display Resolution (µT) serial/GPIB
0.3 tesla 50 0.1
0.6 tesla 100 1
1.2 tesla 200 1
3.0 tesla 500 1
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 withMPT-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
DC, or in AC mode 8 to 3,000 Hz
10 fully corrected measurements per second
7 digit, red LED. 8 additional indicators for range, units, peak hold and filter
All metal, with tilt stand on bench models, bezel mount on rack models
217 x 125 x 50mm, weight 1.2 kg