Keithley 2700 User Manual

D-6 Signal Processing Sequence and Data Flow Model 2700 Multimeter/Switch System User’s Manual
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 shows where Ratio or Ch Avg is calculated in the signal processing sequence.
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
calculation. Ratio or Ch Avg is then calculated as shown in
Figure D-3.
As shown, the result of Ratio or Ch Avg can then be used by an enabled Math operation.
NOTE For details on these calculations, see “Ratio and channel average,” page 5-16.
Input Signals
Rel
Math
(mX+b,
Percent
Limits
Filter
Buffer
Display
Reading
Recall
A/D
Conversion
Process
Chan A Chan B
Ratio
or
Ch Avg
Ratio = Chan A / Chan B
Ch Avg = (Chan A + Chan B) / 2
Rel’ed reading = Reading - Rel Value
Y = mX + b
Percent = ————––—
X - Reference
Reference
100%
Reciprocal = 1/ X
Store
Ratio or
Channel Average
Calculation
Output Trigger Pulse (VMC)
Moving or Repeating
Signal
Conditioning

Keithley 2700 Specifications

General

Type	Digital Multimeter
Measurement Functions	DC Voltage, AC Voltage, DC Current, AC Current, Resistance, Frequency, Temperature
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Frequency Range	3 Hz to 500 kHz
Temperature Range	-200°C to +1372°C
Display	Vacuum Fluorescent Display
Connectivity	IEEE-488, RS-232
Channels	10
Power Supply	100V to 240V AC, 45Hz to 66Hz
DC Current Range	10 µA to 3 A
AC Current Range	10 µA to 3 A
Temperature Measurement	Thermocouple, RTD