Oldham OLCT 200, User Manual, Page: 66 / 80

OLCT 200 User Manual | 66
7.5 Zero Cal Value (Technicians only!)
The Zero Cal Value menu entry allows the zero calibration value to be set for
something other than a zero reading. For example, a OLCT 200 4-20mA input may
represent a BTU Analyzer range of 500
– 1000 BTU’s. In this case, 0% of full scale
equals 500 BTU’s and may be the desired zero calibration point. Other upscale values
may also be used for the zero calibration point by setting this menu item to the desired
engineering unit value. Do not exceed 25% of full scale.
7.6 Raw Min / Max Counts (Technicians only!)
The Raw Min / Max Counts menus determine the range of 10-bit analog to digital
(A/D) converter counts that define 0 & 100% of full scale. Raw Min A/D counts create
0% readings and Raw Max A/D counts create 100% readings. These menus are very
useful in application with non-standard input ranges. For example, for wired models, if
instead of a standard 4-20mA input 8-18mA must be accepted by the OLCT 200. Set
RAW MIN COUNTS to match the 8mA input counts value and RAW MAX COUNTS to
match the 18mA input counts value. The corresponding
Zero 0% and Span 100%
readings are entered in the Configuration Menu describe in section 5.3. Live A/D count
values may be viewed from the CAL MODE Information screen described section 4.1.