Multiple Criteria State Models
The capability to determine if several dimensional criteria are met simultaneously is a powerful tool for inspection that is available in the state models of the HVS 256. With the software functions factory programmed in the sensor, the benefit is simple, low cost inspection. For example, one may inspect the size of several features, the location of the first left edge, the location of the 5th and 6th right edges and the total number of edges that are present. Each of up to 26 criteria can be tested against separate chosen limits and any chosen combination of these criteria may control the discrete state outputs. The capability to gauge multiple criteria is accomplished totally within the sensor, at high speed, without additional computers or controllers. Statistics are available via the communications port.

Analog Models
The HVS 256 product family is also available with two analog output formats, analog voltage and analog current. These units contain a 10 bit digital to analog converter that provides the analog signal from the result computed in the self-contained microcomputer. The voltage output range is selectable -5 to 5, 0 to 5 and 0 to 10V for easy implementation. Both voltage and current models can invert the output signals so that, for example, the voltage or current will decrease for increasing object width. The analog models also contain discrete state output which indicates if the contrast is too low or the feature cannot be seen. All measurement data for many features is available via the communications channel.

Multiple Frame Multiple Criteria State Models
The HVS 270 sensor combines the power of Multiple Criteria State with multiple point inspection. In an inspection sequence, the sensor can take up to ten "frames" of data and process that data as a single inspection. The ability to take statistical measurements, convert pixel data to engineering units and perform complex part inspections make the HVS 270 a low cost alternative to high cost 2-D vision systems. Enhanced timing and math capability make the HVS 270 sensor the most powerful inspection tool of its kind.