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C-6
Signal processing using Ratio or Ch Avg
With a switching module installed, the ratio or average of two channels can be calculated.
Figure C-3
Figure C-3
Signal processing using Ratio or Channel Average
Channel Average
Calculation
With a channel closed and Ratio or Ch Avg enabled, the reading that is applied to the
"Ratio or Ch Avg" block in the flow chart is used as the Chan A value for the calculation.
The paired-channel then closes and that reading is used as the Chan B value for the calcu-
lation. Ratio or Ch Avg is then calculated as shown in
As shown, the result of Ratio or Ch Avg can then be used by an enabled Math operation.
klqb
shows where Ratio or Ch Avg is calculated in the signal processing sequence.
Input Signals
Chan A
Signal
Conditioning
A/D
Conversion
Process
Filter
Rel
Ratio
or
Ch Avg
Ratio or
Math
(mX+b, m/X+b,
Percent, SxIohms,
or SxVohms )
Limits
Store
Recall
Display
Buffer
Reading
For details on these calculations, see
page
5-18.
Model 2790 SourceMeter
Chan B
Moving or Repeating
Output Trigger Pulse (VMC)
Rel'ed reading = Reading - Rel Value
Ratio = Chan A / Chan B
Ch Avg = (Chan A + Chan B) / 2
Y = mX + b
R = m/X + b
X - Reference
Percent = ————––—–
Reference
SxIohms = V
MEAS
SxVohms = V
SOUR
"Ratio and channel average (7702 only),"
®
Switch System Reference Manaul
100%
/ I
SOUR
/ V
x R
MEAS
F
Figure
C-3.
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