Signal Processing Using Ratio Or Ch Avg - Keithley 2750 User Manual

D-6 Signal Processing Sequence and Data Flow

Signal processing using Ratio or Ch Avg

With a switching module installed, the ratio or average of two channels can be calculated.
Figure D-3
Figure D-3
Signal processing using Ratio or Channel Average
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.
NOTE
shows where Ratio or Ch Avg is calculated in the signal processing sequence.
Input Signals
Chan A
Conditioning
Conversion
Ch Avg
Ratio or
Channel Average
Calculation
Store
Recall
Buffer
For details on these calculations, see
Model 2750 Multimeter/Switch System User's Manual
Chan B
Signal
A/D
Process
Filter
Moving or Repeating
Output Trigger Pulse (VMC)
Rel Rel'ed Reading = Reading - Rel Value
Ratio
Ratio = Chan A / Chan B
or
Ch Avg = (Chan A + Chan B) / 2
Y = mX + b
Math
Percent = ————––—
(mX+b,
Percent
Reciprocal = 1/ X
Limits
Display
Reading
"Ratio and channel average," page
X - Reference
100%
Reference
Figure D-3.
5-16.