Input Scale; Output Scale; Exc. Currents - Omega RD8800 User Manual

Chapter 5 Programming
To program a Point tag:
From the Point Setup menu use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to highlight Point tag and press the
ENTER button. The display will show the existing Point tag, if any, as " POINT TAG ". Use the
alphanumeric keypad to enter up to ten characters for your desired Point tag and then press the ENTER
button to return to the Point Setup menu.

5.6.5.2 Input scale

The low and high Input scale is used for configuring the Recorder for the actual input provided by the
transducer. If the input range full scale, e.g. 12.5V, exceeds the actual input signal, say 5V, only half the input
range is actually used. By adjusting the Input scale setting to be 0 to 5V, the entire input range is used for 5V.
Note that the resolution is halved. Only voltage inputs require setting low and high input range values.
NOTE: During point programming, input range voltages are programmed in the same engineering units as
the voltage range selected, i.e. mV or Volts.
To program the point Input scale:
From the Point Setup menu use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to highlight Input scale and press the ENTER
button. You will be prompted with "lo XXXXXXXXXXXXX " (13 places possible). Use the numeric keypad to
enter the low end scale value (the default is zero) and then press the ENTER button. You will be prompted with
"hi XXXXXXXXXXXXX ". Use the numeric keypad to enter the high end scale value (the default is the full scale
value of the range selected) and then press the ENTER button to return to the Point Setup menu.

5.6.5.3 Output scale

All linear current and voltage inputs must be assigned low and high Output scale endpoints. The Output
scale is used to linearly map the input range (set with the Input scale option) to an output range set with the
Output scale option. For example, if a transducer has a 1 volt output equivalent to 5000 PSI, use the 1.25V
input range with an input range setting of 0 to 1.00 V and program the output range to be 0 to 5000. The
actual readings on the display will then be in PSI.
To program the point Output scale:
From the Point Setup menu use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to highlight Output scale and press the
ENTER button. You will be prompted with "places? X". Use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to set the
desired number of decimal places (up to a maximum of 4, NOTE: 5 = E notation) and press the ENTER
button. You will be prompted with "lo XXXXXXXXXXXXX " (13 places possible). Use the numeric keypad to
enter the low end scale value (the default is zero) and then press the ENTER button. You will be prompted
with "hi XXXXXXXXXXXXX ". Use the numeric keypad to enter the high end scale value (the default is the
full scale value of the range selected, which is a direct linear mapping or a scaling of 1) and then press the
ENTER button to return to the Point Setup menu.

5.6.5.4 Exc. Currents

Currents are used to measure a resistance input on the back of the Recorder. If a resistance other than an
RTD is plugged into an input, Exc. Currents must be enabled. The Current is typically 1.00mA.
To enable or disable Exc. Currents:
From the Point Setup menu use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to highlight Exc. Currents and press the
ENTER button. Press the YES or NO button to select the desired state of Exc. Currents to either
currents=YES or currents=NO and then press the ENTER button to return to the Point Setup menu.
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