Laser LS8000-3 manual ⎧Voltage ⋅

LaserSpeed 8000-3 Instruction Handbook

Interfacing with the LS8000-3

Analog speed data can be obtained in a 0–2 V format. An optional selectable voltage/current output module which will convert the 0–2 V signal supplied by the gauge to all of the common voltage/current levels is available. The analog output indicates speed but not direction.

There are two configuration settings that affect the operation of the analog output. The Analog Zero Scale Velocity sets the speed where the analog output reaches 0V. The Analog Full Scale Velocity sets the speed where the analog output reaches 2V. At speeds between these two settings, the analog output increases linearly as the speed increases from the Analog Zero Scale Velocity to the Analog Full Scale Velocity.

Example: If the Analog Zero Scale Velocity were set to 30 m/min, and the Analog Full Scale Velocity were set to 100 m/min, the analog output would behave as shown in the following figure.

Analog Output / Volts

Analog Output vs Measured Velocity with VZS = 30 and VFS = 100 2

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

00	10	20	30	40	50	60	70	80	90	100	110	120	130	140	150
						Measured Velocity

The LS8000's measured speed can be calculated from the analog output voltage with the following equation:

⎧Voltage ⋅	(VFS − VZS )	+ V	0V	<	Voltage	<	2V
⎪	2	ZS
⎪			when Voltage = 0V
Speed = ⎨	≤ VZS
⎪	≥ VFS		Voltage = 2V
⎪
⎩

where:

VFS = Analog Full Scale Velocity

VZS = Analog Zero Scale Velocity

Part No. 93463 / Drawing No. 0921-01561 Page 58 of 221 Revision A (Sep 2007)