Lake Shore 420, User Manual

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Lake Shore Model 420 Gaussmeter User’s Manual
1-2
Introduction
Table 1-1 Model 420 Specifications
Measurement:
Number of Inputs: One
Update Rate: Three Per Second
Autorange: Yes
Field Ranges/Resolutions:
Range Res. Range
Gauss tesla Gauss tesla Gauss tesla
High Sensitivity Probe High Stability Probe Ultra-High Sensitivity Probe
Range Range
±300 kG
±30 kG
±3 kG
±300 G
±30 kG
±3 kG
±300 G
±30 G
±3 G
±300 mG
Res. Res.
±0.1 kG
±0.01 kG
±0.001 kG
±0.1 G
±0.001 G
±0.1 mG
Res.
±0.01 G
±0.01 kG
±0.001 kG
±0.1 G
Range
Res.
±30 T
±3 T
±300 mT
±30 mT
±0.01 T
±0.001 T
±0.1 mT
±0.01 mT
Range Res.
±3 mT
±3 T
±300 mT
±30 mT
±0.001 T
±0.1 mT
±0.01 mT
±0.001 mT
±300 µT
±30 µT
±0.1 µT
±0.01 µT
Electronic DC Accuracy: ±0.45% of reading ±0.05% of range
Drift of DC Electronics: 0.05% of r 1 count per degree Celsius
RMS Frequency Range: 10 to 400 Hertz
AC RMS Accuracy: ±5% or better
Front Panel:
Display Type: 2 line by 16 characters, backlighted LCD
Display Resolution: 4-character (see field ranges above)
Display Units: Gauss or tesla
Keypad: Eight function
Interfaces:
Corrected Analog Output: ±3 volt range
Uncorrected Analog Output: ±3 volts for full scale range; accuracy is probe dependent
Serial communication with RS-232C electrical format; 300, 1200, or 9600 BAUD; RJ-11 connector
Instrument General:
Ambient Temperature Range: 15 °C to 35 °C (59 °F to 95 °F)
Power Requirement: 100, 120, 220, 240 VAC (+5% –10%), 50 or 60 Hz, 25 watts
Size: 216 mm wide x 90 mm high x 317 mm deep, (8.54 x 3.5 x 12.5 inches); half-rack package
Weight: 3 kilograms (6.61 pounds)
1.2 ELECTROSTATIC DISCHARGE
Electrostatic Discharge (ESD) may damage electronic parts, assemblies, and equipment. ESD is a transfer of
electrostatic charge between bodies at different electrostatic potentials caused by direct contact or induced by
an electrostatic field. The low-energy source that most commonly destroys Electrostatic Discharge Sensitive
(ESDS) devices is the human body, which generates and retains static electricity. Simply walking across a
carpet in low humidity may generate up to 35,000 volts of static electricity.
Current technology trends toward greater complexity, increased packaging density, and thinner dielectrics
between active elements, which results in electronic devices with even more ESD sensitivity. Some electronic
parts are more ESDS than others. ESD levels of only a few hundred volts may damage electronic
components such as semiconductors, thick and thin film resistors, and piezoelectric crystals during testing,
handling, repair, or assembly. Discharge voltages below 4000 volts cannot be seen, felt, or heard.