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F71/F41 teslameter specifications

Input overview

Inputs

	F41 single-axis	F71 multi-axis
Number of measurement inputs	1	3
Number of physical connectors	1
Connector type	26-pin mini D-sub
Supported probes/sensors	Single-axis probes and single-axis plug-and-play sensors	Single-axis probes and single-axis plug-and-play sensors, plus multi-axis probes
Probes/sensors NOT supported	400 Series gaussmeter probes, and 2Dex, InAs, and GaAs loose sensors

Ranges

	Autorange	35 mT (350 G)	350 mT (3.5 kG)	3.5 T (35 kG)	35 T (350 kG)
Standard 2Dex	Yes	2 mA drive	2 mA drive	2 mA drive	0.2 mA drive
Cryogenic 2Dex	Yes	No	0.2 mA drive	0.2 mA drive	0.2 mA drive
Standard InAs	Yes	100 mA drive	100 mA drive	100 mA drive	100 mA drive
Cryogenic InAs	Yes	No	2 mA drive	2 mA drive	2 mA drive

Software features

Available measurement readings

	Frequency range	Probe/sensor	DC component	AC RMS	AC peak values	Frequency
DC mode	DC only	Single-axis	Yes	—	—	—
DC mode	DC only	3-axis	Yes (X, Y, Z, magnitude)	—	—	—
AC mode	DC to 550 Hz*	Single-axis	Yes	Yes	Yes	Yes
AC mode	DC to 550 Hz*	3-axis	Yes (X, Y, Z, magnitude)	Yes (X, Y, Z, magnitude)	Yes (X, Y, Z, magnitude)	Yes (largest amplitude signal)
High- frequency mode	1.7 Hz to 75 kHz*	Single-axis	—	Yes	Yes	Yes
High- frequency mode	1.7 Hz to 75 kHz*	3-axis	—	Yes (X, Y, Z, magnitude)	Yes (X, Y, Z, magnitude)	Yes (largest amplitude signal)

*Frequency range defined as -3 dB point. See frequency specification for detailed information of instrument roll-off.

Relative values

Values referenced by the relative value feature

	Single-axis probe/sensor	3-axis probe/sensor
DC mode	Field reading	Vector magnitude reading
AC mode	RMS reading	RMS of vector magnitude reading
High-frequency mode	RMS reading	RMS of vector magnitude reading

Maximum hold

Values stored with the maximum hold feature

	Single-axis probe/sensor	3-axis probe/sensor
DC mode	Field reading	Vector magnitude reading
AC mode	RMS reading	RMS of vector magnitude reading
High-frequency mode	RMS reading	RMS of vector magnitude reading

Maximum value		Closest value to +∞
Minimum value		Closest value to -∞
Max hold reset		Reset max and min values at the same time or separately

Performance specifications

All specifications have a minimum confidence interval of 95% with a test uncertainty ratio of 4:1.

Specifications are defined as 1 year after calibration with an instrument environment within ±5 °C of calibration.

Temperature coefficient of ±0.002% of rdg/°C beyond ±5 °C of instrument calibration temperature applies to all accuracy specifications.

Instruments are typically calibrated at an ambient temperature of 22 °C. The exact temperature can be found through the front panel of the instrument.

DC field measurement performance

System absolute measurement accuracy

Accuracy of the reported field measurement
InAs and 2Dex sensors have identical individual axes accuracies; 3-axis magnitude accuracies are slightly better for 2Dex sensors due to reduced planar Hall effect
Probes calibrated to 2.5 T minimum and extrapolated to 35 T
Accuracy of flexible stem probes (FP-2X-250-TF15) limited to ±1.5% for all ranges and modes

Single-axis probes (transverse/axial)

	2Dex probe sensor	InAs probe sensor
35 T (350 kG) range	±0.2% of rdg	Not yet specified
3.5 T (35 kG) range	±0.15% of rdg	±0.15% of rdg
350 mT (3.5 kG) range	±0.15% of rdg	±0.15% of rdg
35 mT (350 G) range	±0.15% of rdg	±0.15% of rdg
35 T (350 kG) cryogenic range	±0.2% of rdg	Not yet specified
3.5 T (35 kG) cryogenic range	±0.2% of rdg	Not yet specified
350 mT (3.5 kG) cryogenic range	±0.2% of rdg	Not yet specified

3-axis probes

Measurement uncertainty individual probe axes and calculated vector magnitude values

	2Dex probe sensor	InAs probe sensor
35 T (350 kG) range	±0.40% of rdg	Not yet specified
3.5 T (35 kG) range	±0.30% of rdg	±0.30% of rdg
350 mT (3.5 kG) range	±0.30% of rdg	±0.30% of rdg
35 mT (350 G) range	±0.30% of rdg	±0.30% of rdg
35 T (350 kG) cryogenic range	±0.40% of rdg	Not yet specified
3.5 T (35 kG) cryogenic range	±0.40% of rdg	Not yet specified
350 mT (3.5 kG) cryogenic range	±0.40% of rdg	Not yet specified

System measurement noise

Typical RMS measurement noise at zero field (teslameter and probe both contribute to measured noise, a realistic representation of measurement performance).

	Averaging window
	10 ms	200 ms (default)	1 s	10 s
35 T (350 kG) range	300 µT (3 G)	70 µT (700 mG)	30 µT (300 mG)	10 µT (100 mG)
3.5 T (35 kG) range	6 µT (60 mG)	1.2 µT (12 mG)	0.6 µT (6 mG)	0.17 µT (1.7 mG)
350 mT (3.5 kG) range	0.7 µT (7 mG)	0.16 µT (1.6 mG)	0.07 µT (0.7 mG)	0.03 µT (0.3 mG)
35 mT (350 G) range	0.5 µT (5 mG)	0.12 µT (1.2 mG)	0.05 µT (0.5 mG)	0.02 µT (0.2 mG)
35 T (350 kG) cryogenic range	300 µT (3 G)	70 µT (700 mG)	0.05 µT (0.5 mG)	0.02 µT (0.2 mG)
3.5 T (35 kG) cryogenic range	38 µT (380 mG)	8.5 µT (85 mG)	3.8 µT (38 mG)	1.2 µT (12 mG)
350 mT (3.5 kG) cryogenic range	4.4 µT (44 mG)	1 µT (10 mG)	0.44 µT (4.4 mG)	0.14 µT (1.4 mG)

TruZero™ residual offset

Remaining detectable measurement offset (observed at zero field and expected to be present at higher fields as well)

	Individual axes (single-axis, X, Y, Z)	3-axis magnitude
Offset within ±5 °C of probe calibration temperature	±3.5 µT (±35 mG)	±7 µT (±70 mG)
Typical temperature coefficient beyond ±5 °C of probe calibration temperature	±0.3 µT/°C (±3 mG/°C)	±0.6 µT/°C (±6 mG/°C)

Quantum Hall effect additional uncertainty

When operating at high field at cryogenic temperatures, the Shubnikov-De Hass effect causes small oscillations in the effective Hall sensor sensitivity. The following plot outlines the additional uncertainty values that should be expected.

AC field measurement performance

AC mode bandwidth

AC mode cut-off frequency

550 Hz (-3 dB)
60 Hz (-0.2%)

Teslameter frequency response: AC mode

AC mode accuracy

Accuracy of the reported field measurement at frequencies within the flat response portion of the instrument frequency response curve.

	Individual axes (single-axis, X, Y, Z)	3-axis magnitude
RMS	±0.25% of reading ±0.05% of range	±0.5% of reading ±0.1% of range
Peak to peak	±0.55% of reading ±0.2% of range	Reading not present on instrument

High-frequency mode measurement performance

High-frequency mode bandwidth

High-frequency mode passband

1.7 Hz to 75 kHz (-3 dB point)
20 Hz to 7 kHz (-0.2%)

Teslameter frequency response: high-frequency mode

High-frequency mode accuracy

Accuracy of the reported field measurement at frequencies within the flat response portion of the instrument frequency response curve.

	Individual axes (single-axis, X, Y, Z)	3-axis magnitude
RMS	±0.5% of reading ±0.5% of range	±1% of reading ±1% of range
Peak to peak	±2% of reading ±2% of range	Reading not present on instrument

Frequency detection

Frequency detection counter accuracy

±1% of frequency ±1 Hz for a periodic wave faster than 1 Hz and RMS value greater than 1% of range

Temperature compensation

Temperature compensation of field

Sensor/probe temperature-dependent field measurement error — we have characterized the temperature dependence of sensitivity for our Hall sensors and apply a correction factor to compensate. The residual error listed below reflects the variability that exists from sensor to sensor.

	Temperature range
	-273 °C to 0 °C	0 °C to 35 °C	35 °C to 60 °C	60 °C to 90 °C
Compensation: on	±1.5%	±0.02%	±0.1%	±0.5%
Compensation: off	See temperature coefficient of sensitivity data for loose 2Dex sensors

Temperature compensation sources		Embedded probe sensor, manual entry (front panel), manual entry (external communication), none (compensation off)

Temperature compensation range		Probe dependent (see probe specifications for details)

Probe/sensor temperature measurement

Accuracy of temperature measurements when the teslameter is reading the embedded temperature sensor inside the Hall probe/sensor. Note that the temperature sensor is reading the temperature of the sensing element, which may be slightly warmer than ambient temperature.

Accuracy		±1 °C

Temperature coefficient		±0.05 °C/degree¹

¹ This means that for every degree outside the 5 °C calibration temperature margin, the standard 1 °C accuracy value will increase by 0.05 °C.

Analog output

	Mode	Function	Channels/readings available (non-concurrent)
Raw modes	DC	Diagnostic only	X, Y, Z
	AC	Diagnostic only	X, Y, Z
	High frequency	Analog representation of waveform (pulse, etc.)	X, Y, Z
Corrected modes	DC	Analog representation of field values	X, Y, Z, vector magnitude
	AC	Analog representation of RMS field values	X, Y, Z, vector magnitude
	High frequency	Analog representation of RMS field values	X, Y, Z, vector magnitude

Limits		±12.5 V possible during overload

Raw signal source		Analog amplified Hall voltage
Raw signal accuracy		±1% of amplified Hall voltage value ±50 mV

Corrected output source		DAC generated voltage based on field reading
Corrected output range		±3.5 V = full range
Corrected output accuracy		±1% of front panel measurement
Corrected output update rate		2 kHz

Field control option card

Control types		Closed loop (PI) or open loop
Closed-loop control technology		Proprietary composite DAC, ensures control circuit does not limit resolution
Features		Setpoint, setpoint ramping
Full-scale voltage output		±10 V
Control resolution		<0.1 µT (<1 mG)*
Protections		Configurable maximum slew rate, configurable voltage limit
Open loop voltage accuracy		±1% of full scale

* Specified value applies for the 350 mT range with 10-second averaging. Specification limited by measurement noise. Control resolution for a particular configuration is double the specified system noise.

Digital I/O

Inputs

Number of independent inputs		2
Input isolation		Optical
Maximum low-level input voltage		1 V
Minimum high-level input voltage		4 V
Safe input voltage rage		-5 V to 35 V

Outputs

Number of relays		2
Relay type		Solid state
Digital output relay maximum current		2 A
Digital output relay maximum voltage		35 V

Environment

Instrument operating environment		23 °C ±5 °C and <70% relative humidity non-condensing at rated accuracy; -20 °C to 70 °C and <90% relative humidity non-condensing at reduced accuracy

Instrument max field exposure		10 mT (100 G) DC, 1 mT (10 G) RMS

Communication

Protocols

Each protocol is supported on all interfaces.

	Function
SCPI commands	Native communication method with instrument
Python driver	Simplifies connection and operation with Python
LabVIEW™ driver	Add teslameter to LabVIEW™-controlled systems
IVI.NET driver	Easier integration with test and measure instruments

USB host

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

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		B-type USB connector
	Software support		LabVIEW^™ (F71 or F41) andIVI.NET drivers

Ethernet

	Function		TCP/IP command and control, mobile app (in development)
	App layer protocol		Standard commands for programmable instruments (SCPI)
	Connector		RJ-45
	Speed		1 Gb/s
	Software support		LabVIEW^™ (F71 or F41) and IVI.NET drivers

Display

Display update rate		5 rdg/s

Display		5 in capacitive touch, color 800 × 480 with LED backlight

General

Operating conditions		23 °C ±5 °C, <70% relative humidity non-condensing at rated accuracy; -20 °C to 70 °C, <90% relative humidity non-condensing at reduced accuracy
Power requirement		100 V to 240 V (universal input), 50 to 60 Hz, 30 VA
Size		217 mm W × 87 mm H × 317 mm D (8.5 in × 3.4 in × 14.5 in), half rack
Weight		3.2 kg (7 lb)
Approval		CE mark
Warm-up time		Ready on boot
Power consumption		35 W maximum

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