GTCO CR 1212 - Users Guide - Manual (Page 46)

CR 1212 46
Appendix A Specifications
Physical Description
Approximate physical dimensions:
Width
Length
Maximum Height
Weight
16 inches (406 mm)
17 inches (432 mm)
1.3 inches (33 mm)
7 lbs. (3.2 kg) maximum
Power Supply Specifications
The CR 1212 power supply for the RS-232C configuration is specified as:
 Input: 120 VAC +7%, -13%, 58 to 62 Hz
 Output: 5 VDC at 225 mA, less than 50 mV ripple, +/-5% regulation, rise time less
than 100 milliseconds
Operating Specifications
Standard Accuracy: +/-0.050 inches (1.27 mm) or better
Accuracy is how closely a point’s actual location is determined.
Active Area: 12 inches by 12 inches (305 mm by 305 mm) approximately
The area of the tablet that senses the stylus/cursor location and where valid reports are
obtained.
Jitter: Stylus or cursor: +/-1 count of resolution
Jitter is the different in values collected by the graphics tablet for the same point (for
example, 200, 201 and 202). Jitter can be caused by electrical noise from environmental
sources or from the tablet’s analog-to-digital conversion circuitry. Noise affects the signal
that identifies a point. Jitter is measured as one unit of the resolution.
Proximity: 0.5 inches (12.7 mm) approximately
Proximity is the maximum distance the stylus/cursor can be held above the active area and
report a valid position.
Resolution: Up to 508 lpi (lines per inch)
Resolution is the “fineness” of detail that the tablet can distinguish. Resolution is expressed
in lines per inch (lpi) or lines per millimeter (lpmm).