475 gaussmeter specifications

General measurement

(Does not include probe error unless otherwise specified)

Input type: Single Hall effect sensor

Probe features: Linearity Compensation, Temperature Compensation, Auto Probe Zero, and Hot Swap

Measurement features: Autorange, Max/Min Hold, Relative Mode, and Frequency

Connector: 15-pin D style

DC measurement

Measurement resolution (RMS noise floor): Indicated by value in the above table for shorted input (probe effects not included); value measured as peak-to-peak divided by 6.6

Display resolution: Indicated by the number of digits in the above table

*Limited feature set, interface dependent

DC accuracy: ±0.05% of reading ±0.005% of range

DC temperature coefficient: ±0.01% of reading ±0.003% of range per °C

AC RMS measurement

Measurement resolution (RMS noise floor): Indicated by value in the above table for shorted input

Display resolution: Indicated by the number of digits in the above table

Max reading rate: 30 rdg/s (100 to 1000 rdg/s; limited feature set, interface dependent)

AC accuracy: ±1% of reading ≥ 1% of full-scale range

AC frequency range: 1 Hz to 1 kHz, narrow-band mode, 50 Hz to 20 kHz, wide-band mode

AC band limiting (filters): 18 user-selected frequencies of 3 low-pass or 15 band-pass

Peak measurement

Measurement resolution (RMS noise floor): Indicated by value in the above table for periodic mode and shorted input

Display resolution: Indicated by the number of digits in the above table

Max reading rate (periodic mode): 30 rdg/s (100 to 1000 rdg/s; limited feature set, interface dependent)

Peak accuracy (5 Hz to 20 kHz): ±2% of reading =1% of full-scale range (20 µs or longer pulse width)

Peak accuracy (20 kHz to 50 kHz): ±5% of reading =1% of full-scale range (20 µs or longer pulse width)

Peak frequency range (periodic mode): 50 Hz to 5 kHz

Peak frequency range (pulse mode): 5 Hz to 50 kHz

Temperature measurement

Temperature range: Probe dependent (typically 0 °C to 75 °C)

Measurement resolution: 0.01 °C

Electronic accuracy: ±0.7 °C

Front panel

Display type: 2 line × 20 character, vacuum fluorescent with 9 mm high characters

Display resolution: To ±5¾ digits

Display update rate: 5 rdg/s

Display units: Gauss (G), Tesla (T), Oersted (Oe), and Ampere per meter (A/m)

Units multipliers: µ, m, k, M

Display annunciators:

LED annunciators:

Keypad: 22 full travel keys

Front panel features: Display prompts, front panel lockout, and brightness control

Interfaces

RS-232C

Baud: 9600, 19200, 38400, and 57600
Update rate: 30 rdg/s (ASCII)
Software support: LabVIEW™ driver
Connector: 9-pin D-style, DTE configuration

IEEE-488.2

Capabilities: SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT1, C0, and E1
Update rate: >30 rdg/s (ASCII), to 100 rdg/s (binary, no temperature compensation)
Software support: LabVIEW™ driver

Data buffer

Capacity: 1024 field readings
Reading rate: 1 to 1000 rdg/s
Data transfer: Through computer interface, after data is logged
Trigger: Hardware trigger to begin data log sequence

Alarm

Settings: High/Low setpoint, Inside/Outside, Audible, and Sort
Actuators: LED annunciator, beeper, and relays

Relays

Number: 2
Contacts: Normally open (NO), normally closed (NC), and common (C)
Contact rating: 30 VDC at 2 A
Operation: Follows alarm or operated manually
Connector: In 25-pin I/O connector

Voltage output 1

Configuration: Real-time analog voltage output of wide-band AC signal
Range: ±3.5 V
Scale: ±3.5 V = ±FS on selected range
Frequency response: 1 Hz to 40 kHz (wide-band AC)
Accuracy: Probe dependent
Noise: ±1.0 mV
Minimum load resistance: 1 kΩ (short-circuit protected)
Connector: In 25-pin I/O connector

Voltage output 2

Configuration: Voltage output of field value, generated by DAC
Range: ±5 V
Scale: ±3.5 V = ±FS on selected range
Resolution: 16-bit, 0.15 mV
Update rate: 40,000 updates/s
Accuracy: ±10 mV
Noise: ±0.3 mV
Minimum load resistance: 1 kΩ (short-circuit protected)
Connector: In 25-pin I/O connector

Voltage output 3

Configuration: Voltage output of compensated DC or RMS field value, generated by DAC (also used for field control)
Range: ±10 V
Scale: User specified (defaults same as voltage output 2)
Resolution: 16-bit, 0.3 mV
Update rate: 30 updates/s
Accuracy: ±2.5 mV
Noise: ±0.3 mV
Minimum load resistance: 1 kΩ (short-circuit protected)
Connector: In 25-pin I/O connector

General

Ambient temperature: 15 °C to 35 °C at rated accuracy, 5 °C to 40 °C with reduced accuracy
Power requirement: 100, 120, 220, and 240 VAC (+6%, -10%), 50 Hz or 60 Hz, 20 VA
Size: 216 mm W × 89 mm H × 318 mm D (8.5 in × 3.5 in × 12.5 in), half rack
Weight: 3 kg (6.6 lb)
Approval: CE mark, RoHS

Probes and extensions

Probe compatibility: Full line of standard probes available — custom probes also available (not compatible with Model 450/421 probes) — More information on probe compatibility
Hall sensor compatibility: Front panel programmable sensitivity and serial number for user-supplied Hall sensor — More information on Hall sensor compatibility
Extension cable compatibility: Calibrated or uncalibrated probe extension cables with an EEPROM are available from 10 ft to 100 ft — More information on Extension cable compatibility

Lake Shore calibrated extension cables maintain the same accuracy as the Model 475 probe.

The uncalibrated version involves the operator leading the matching probe data file into the cable PROM directly from the Model 475 front panel. Additional errors caused by the uncalibrated extension cables are ±0.2% of field reading error and 1 ºC temperature reading error.