Scale Calibration; Calibration Scales; Connecting Voltage Source; Programming Calibration Scales - Omega RD8800 User Manual

Chapter 6 Calibration

6.3 Scale Calibration

The Recorder menu supports full calibration for the voltage and current input ranges of the instrument. Each range
requires a unique calibration constant, which is automatically calculated during the calibration of each range.

6.3.1 Calibration Scales

Follow the procedures below to Calibrate Scales.

6.3.1.1 Connecting Voltage Source

Connect the precision voltage source to any available direct input at the rear upper (lower) analog
Input terminals (See Figure 2-6). Select any channel and connect the voltage source to the + and -
inputs ensuring the correct polarity. Turn on the Voltage Source and allow 10 minutes for it to warm
up and stabilize.

6.3.1.2 Programming Calibration Scales

From the Hidden menu use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to select ADC control and then press the
ENTER button. The only available option is Cal Adc so just press the ENTER button. Use the UP (↑ ↑ ↑ ↑ ↑ ) or
DOWN (↓ ↓ ↓ ↓ ↓ ) button to highlight Cal scales and press the ENTER button. The Calibration Scale options will
be displayed.

6.3.1.3 Calibrating the Voltage Ranges

To calibrate any of the voltage ranges, a known good input must be supplied to the Recorder as shown in
the table below:
Range to Calibrate
Set the precision Voltage Source for the appropriate range. Then use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to
select the range in need of calibration and press the ENTER button. You will be prompted with "cal input?
X". Use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to select the channel input number (1, 2, 3, 4, 5 or 6) to which the
Voltage Source is connected and press the ENTER button. You will be prompted with "APPLY [range
selected]". With the Voltage Source connected and turned on, press the OK? button. A window will
appear showing the reading of the Voltage Source connected.
NOTE: If the calibration is not correct, the value shown in the window will not be correct.
Press the CAL. button. You will then be prompted with "Are You Sure?". Press the CAL. button to
continue the calibration or the NO button to abort. If the CAL. button is pressed, the Recorder calibrates
the selected range. Repeat for the remaining voltage ranges.
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Voltage Source
150 mV 150 mV
1.25 V 1.25 V
2.5 V 2.5 V
12.5 V 12.5 V
25 V 25 V
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