Hall measurement

FastHall™ method (no physical field reversal) — van der Pauw samples
Traditional method — Hall bar and van der Pauw samples

Derived parameters

Hall coefficient, Hall mobility, resistivity, carrier concentration

Maximum sample size

Solder card: 10 mm × 10 mm × 3 mm
Pin card: 10 mm × 10 mm × 2 mm

DC magnetic field intensities

Room temperature: 1 T
With LN₂ option: 0.75 T

Resistance range

10 mΩ to 1 GΩ

Hall mobility range

0.01 to 106 cm2/V ‍s

Carrier concentration

800/cm3 to 8 × 1023/cm3 (typical)

Measurement speed

<10 s (typical)

Programmable limits

I out: compliance voltage; V out: current limit
      Positive output: ±5% of setting (when setting is >10% of its full-scale range)
      Negative output: ±5% of setting (when setting is >10% of its full-scale range)
Programming resolution current limit: 0.1% of full-scale current range (auto selected)
Programming resolution voltage limit: 10 mV

Instrument analog input

Analog input raw signal accuracy: ±300 mV of reading
Raw analog input voltage range: ±11 V
Safe input voltage range: ±15 V
Compliance voltage (typical):≤10 V
Current limit (typical): ≤0.1 A

Instrument analog output

Analog output raw signal accuracy: ±300 mV of setting
Raw analog output voltage range: ±11 V rails, ±15 V max during overload

Instrument digital input

Number of independent inputs: 4
Input isolation: Optical
Maximum low-level input voltage: 1 V
Minimum high-level input voltage: 4 V
Safe input voltage range: -5 V to 32 V

Instrument digital output

Number of independent outputs: 4
Relay type: Solid state
Digital output relay max current: 1.5 A
Digital output relay max voltage: 32 V

Instrument rear panel test connectors

Sample connections: 6 individual 3-lug socket triaxial connectors
Analog input BNC
Analog output BNC
10-pin Phoenix connector for digital output
10-pin Phoenix connector for digital input
2-pin Phoenix connector for signal return

Instrument front panel

Display: 5 in capacitive touch, color TFT-LCD WVGA (800 × 480) with LED backlight

Instrument interface

USB host
      Type: USB 3.0, mass storage class (MSC) device
      Function: Firmware updates, flash drive support
      Location: Rear panel
      Connector: USB Type-C™

USB device
      Type: USB 2.0
      Function: Emulates a standard RS-232 serial port
      Protocol: Standard commands for programmable instruments (SCPI)
      Baud rate: 115,200
      Connector: USB Type-B
      Software support: LabVIEW™ and IVI.NET drivers (coming soon)

      Function: TCP/IP command and control, mobile app
      Application layer protocol: Standard commands for programmable instruments (SCPI)
      Connector: RJ-45
      Speed: 1 Gb/s
      Software support: LabVIEW™ and IVI.NET drivers (coming soon)


Operating conditions: 23 °C ±5 °C at rated accuracy; 10 °C to 35 °C at reduced accuracy, <70% RH non-condensing


M91 FastHall measurement controller

      Warm-up time: 30 min

      Maximum field exposure: Operational limit <10 mT DC, 1 mT RMS; Guaranteed performance <2 mT RMS

      Power requirement: 100 V to 240 V (universal input), 50 to 60 Hz, 30 VA

      Size: 216 mm W × 87 mm H × 369 mm D (8.5 in × 3.4 in × 14.5 in), half rack

      Weight: 3.2 kg (7 lb)


Measurement platform with magnet and insert

      Size: 254 mm W × 330.2 mm H × 457.2 mm D (10 in × 13 in × 18 in)

      Weight: 9.1 kg (20 lb)


LN2 option with 0.75 T magnet and insert

      Size: 140 mm W × 235 mm H × 209.6 mm D (5.5 in × 9.25 in × 8.25 in)

      Weight: 5.4 kg (12 lb)


Gate bias option (Model 155 precision I/V source)

      Size: 216 mm W × 87 mm H × 369 mm D (8.5 in × 3.4 in × 14.5 in), half rack

      Weight: 3.2 kg (7 lb)


Approval: CE mark