DTM-151 Series
DS Model (Bench, Serial)
PS Model
Panel Mount, GPIB
QUICK FACTS
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High accuracy - fully temperature compensated
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Resolution of 1 part in 600,000
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4 ranges
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Maximum field 3 Tesla
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7 digit display
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Either RS232 or IEEE488/GPIB communications
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Accuracy is 0.01% of reading + 0.006% of full scale when used with MPT-141 probe
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Temperature range for instrument and probe 0 to 50° C
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Best use in conjunction with an MPT-141 or LPT-141 for standard sensitivity or an MPT-231or LPT-231 Hall Effect Probes for high sensitivity, low-field operation.
Ordering Guide
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D T M - 1 5 1 - D S
Product Initials
DTM - Digital Teslameter
Series Model
Mount
Style
D - Bench Top
P - Panel Mount
151 - With Temperature Compensation
133 - No Temperature Compensation
152 - With Temperaure Compnesation,
Touchscreen Display
333 - No Temperature Compensation, 3-Axis,
3-Channel, Touch Screen Display
Communication
S - Serial RS232
G - GPIB, IEEE-488
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FEATURES
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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.
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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.
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Digital filtering (time averaging) can be enabled to suppress short term fluctuations.
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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.
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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.
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Two analog outputs are available. These are a buffered version of the raw probe signal, and are not corrected for linearity or temperature.
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All models are available without display or front buttons, for true “Black box” requirements.
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Panel mount versions are available, and panels with correct cut-outs and mounting hardware.
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 Zero Drift
ppm /°C µT/°C
LPT-141 4 x 1.61 in 600,000 3T 1µT ± 0.01% ± 10 ± 1
LPT-231 4 x 1.61 in 600,000 0.3T 0.1µT ± 0.03% ± 25 ± 1
MPT-141 1 x 0.51 in 600,000 3T 1µT ± 0.01% ± 10 ± 1
MPT-231 1 x 0.51 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 LPT-141 PROBE (LIMPET 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
3.0 tesla 10 1
DTM-151 with LPT-141 probe Filtering OFF
Range selected Resolution (µT) Display Resolution (µT) serial/GPIB
0.3 tesla 5 0.1
0.6 tesla 10 1
1.2 tesla 20 1
3.0 tesla 50 1
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Absolute Accuracy
± 0.01% of reading ± 0.006% of range at 25° C
Temperature Stability
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scale factor: ± 5 ppm of reading / ° C typical, ± 10 ppm of reading / ° C max.
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zero drift: ± (1m T + 0.0003% of full scale ) / ° C max.
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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