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APPENDIX A – System specification
HS20 laser head specification
Laser type
Wavelength
Laser beam diameter
Vacuum wavelength accuracy
Range
Analogue output signal period
Digital quadrature output
resolutions
Output update rates
Maximum velocity
Output formats
Laser status outputs
(24 V active low signals)
Power supply requirements
Internal fuse
HS20 weight
Operating environment
Indoor Use:
Pressure
Humidity
Temperature
Altitude
HeNe Class II
632.8 nm
6 mm
±0.1 ppm
0 m to 30 m
0 m to 60 m
316 nm
79.12382213, 158.2476443,
316.4952885 and 632.9905770 nm
1, 2, 4, 8 and 16 MHz
2 m/sec (at 16Mhz update rate)
RS485 differential digital
quadrature
1 V peak to peak sine/cosine
signals
Beam block
Overspeed
Unstable
Beam low
24 V DC ± 1 V @ 2.0 A
24 V DC ± 1 V @ 1.2 A
24 V DC ± 1 V @ 0.7 A
Thermal resetable
3.1 kg
650 mbar to 1150 mbar
0% to 95% RH
Maximum relative humidity 80%
0 ºC to 40 ºC
0 to 2000m
Maximum output power from laser tube
<1 mW
12 mm centre to centre (outward and
return beams)
with standard linear optics
with long range linear optics
Retroreflector interferometer
selectable through the configuration
switches
selectable through the configuration
switches
≥ 158 nm
terminate with 120 Ω resisitor
Asserted when signal strength ≤10%
Asserted if invalid quadrature transition
detected
Asserted if laser unstable
Asserted if signal strength ≤20%
Inrush (first 10 ms)
Warm-up (~10 mins)
Operation at room temperature (20 ºC)
Normal atmospheric
Non-condensing
for temperatures up to 31˚C decreasing
linearly to 50% relative humidity at 40˚C
53
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