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Model 421 Gaussmeter
Measures AC or DC magnetic fields

Features Max Hold, Autorange, Alarm, Relative and Filter modes

Resolution to 4 ¾ digits (1 part in ±30,000)

DC accuracy is ±0.20% of reading

Sort function allows for quick testing of magnet parts in production applications

High-visibility vacuum-fluorescent display is easily read at a distance

Analog voltage outputs, RS232C serial port and
user-configurable output relay

Includes axial or transverse probe
show enlarged front and back panels
Show compatible gaussmeter probes
Price: $ 2,141
The Model 421 is a benchtop, laboratory gaussmeter, capable of measuring magnetic fields from 0.001 Gauss to 300 kGauss (measurement range is dependent on probe used). This unit is well-suited to magnet testing, quality assurance, and other applications requiring highly repeatable magnetic measurements. Measurements of AC and DC magnetic fields are shown in Gauss or Tesla on the two-line vacuum fluorescent display. A Sort function allows magnet parts to be quickly checked on a pass/fail basis, while the serial port enables the gaussmeter to be controlled by a computer or automation equipment. A hall-effect gaussmeter probe is included with the Model 421, and may be selected from an extensive line of probe constructions.
General Specifications
Measurement Ranges 300mG / 3 G / 30 G / 300 G / 3 kG / 30 kG / 300 kG
(range is dependent on probe type)
Resolution 0.01mG (when used with filter on and appropriate probe)
Accuracy, DC (displayed) ± 0.20% of reading; ± 0.05% of range
Accuracy, AC (displayed) ± 2% of reading, rms (50 Hz - 60 Hz)
Frequency Range 10 Hz - 400 Hz
Update Rate 5 readings / sec (display); up to 18 readings / sec on ports
Display Resolution ± 4 3/4 digits (max.)
Measurement Modes AC / DC
Measurement Features Auto Range, Max Hold, Relative Mode, Filter
Measurement Units Gauss or Tesla (with u, m, and k multipliers)
Probes Features Linearity correction, auto probe zero
Types Axial, transverse, flexible transverse
Compatibility Standard and custom probes available
Connector 15-pin D-style
Front Panel Display Vacuum-Flourescent, high-visibiliy blue, 2 lines x 20 characters
Communication Ports RS232C (300 / 1200 / 9600 Baud)
Alarms Settings High/low set point, inside/outside, audible
Actuators Display annunciator, sort message, beeper,
relay output
Relay Output Operation Follows alarm settings (see above)
Contacts NO and NC outputs (rated 30VDC at 2A)
Connector Detachable terminal block
Temperature Range 15 - 35° C (operating temp; 5 - 40° with reduced accuracy)
Input Power 100, 120, 220, 240 VAC 50/60Hz (select voltage when ordering)
Analog Outputs
Analog Outputs 1
(monitor output )
Configuration Real-time analog output voltage
Output Voltage ± 3V = ± FS on selected range
Accuracy Probe dependent
Frequency Response DC to 400 Hz
Analog Output 2
(corrected output)
Configuration Output voltage from DAC
Output Voltage ± 3V = ± FS on selected range
Accuracy ± 0.35% of FS
Update Rate 5 updates / sec
Connectors 2 x BNC jacks
Net Weight 6.6 lbs (3 kg)
Size (W x H x D) 8.5" x 3.5" x 12.5" (217mm x 90mm x 317mm; fits in half-rack space)
Package Contents Gaussmeter, manual, zero-gauss chamber, line cord,
probe (select from axial, transverse, or flexible transverse models),
mating terminal-block connector for relay outputs
Software Labview driver (available for download)
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Copyright © 2003 Oersted Technology II Inc.