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73VR2102 / 73VR2104 / 73VR2106 / 73VR2108 / 73VR2110 / 73VR2112 USERS MANUAL EM-7395-B Rev.24
ZERO & SPAN CALIBRATION
- Span (+) and Span (–) calibrations must have another calibration point (Zero or Span).
- Calibration points must be in relation to each other as follows: Span (–) point < Zero point < Span (+) point.
Otherwise the calibration will result in error.
- Switching the channel’s analog input type will reset the calibrated values.
• Zero calibration (offset) only
Input signal
Zero point
a
b
a : Measured value
b : Calibrated value
• Zero calibration (offset) + Span (+) calibration
Input signal
Zero point
Span (+) point
a
b
d
c
Span (+) point
a
b
Span (+) point
d
c
a : Measured value
b : Calibrated value (Zero)
c : Measured value
d : Calibrated value (Span +)
Before calibration
Zero calibration
Before calibration
Zero calibration
Zero + Span (+) calibration
Before calibration
Zero calibration
Zero + Span (–) calibration
• Zero calibration (offset) + Span (–) calibration
Input signal
Zero point
Span (–) point
a
b
c
d
a : Measured value
b : Calibrated value (Zero)
c : Measured value
d : Calibrated value (Span –)
Before calibration
Span (+) + Span (–) calibration
• Span (+) calib Span (–) calibration
Input signal
Span (–) point
c
d
a : Measured value
b : Calibrated value (Span +)
c : Measured value
d : Calibrated value (Span –)
Before calibration
Zero calibration
Zero + Span (+) + Span (–) calibration
• Zero calibration (offset) + Span (+) calib Span (–) calibration
Input signal
Zero point
Span (–) point
a
b
e
f
a : Measured value
b : Calibrated value (Zero)
c : Measured value
d : Calibrated value (Span +)
e : Measured value
f : Calibrated value (Span –)
73VR21x measuring range and the unit used in calibration
The analog inputs (ch.1 through 12) are represented in 16-bit integer with the engineering unit as explained below:
ANALOG TYPE
MIN. SPAN
±12V, ±6V, ±3V
1mV
±1000mV, ±500mV
0.1mV
±250mV, ±125mV, ±60mV
0.01mV
Temperature input
0.1°C
Before the zero/span adjustments...
1. Set the input and burnout types for the channel to be calibrated.
2. Apply a known reference input signal of adequate accuracy.
3. In order to eliminate noise interference during the calibration procedure, set the AD conversion mode to Low setting.
4. Choose the channel number indicated to the right of Zero/span calibration. For Input 7 through 12, go to next page.