Keithley 2750 User Manual page 187

5-20 Rel, Math, Ratio, Channel Average, dB
Enabling/disabling ratio or channel average
As with front panel operation, enabling ratio disables channel average and conversely,
enabling channel average disables ratio.
Ratio and channel average delay
:RATio:DELay or :CAVerage:DELay sets the delay between the two channel measure-
ments for the enabled calculation. This delay is applied after the trigger delay in the trigger
model (see
default delay keeps the relays from cycling too fast. Setting a shorter delay may shorten
the life of the relays.
It does not matter which of the two commands you use to set the delay. The set delay
affects both ratio and channel average.
Ratio and channel average programming examples
Example #1 — The following command sequence performs the ratio calculation using
primary channel 102 of the Model 7700. After READ? is sent, the Model 2750 must be
addressed to talk to return the result of the calculation.
*RST
FUNC 'VOLT'
ROUT:CLOS (@102)
RAT ON
READ?
Example #2 — The following command sequence configures channels 103 and 105 for
the ratio and channel average calculations. When channel 103 is scanned, the ratio calcula-
tion is based on DCV measurements of channels 103 and 113. When channel 105 is
scanned, the channel average calculation is based on TEMP measurements of channels
105 and 115.
FUNC 'VOLT',(@103)
RAT ON,(@103)
FUNC 'TEMP',(@105)
CAV ON,(@105)
Section 8 for details). This delay cannot be set from the front panel. The 0.5s
Model 2750 Multimeter/Switch System User's Manual
' One-shot measure mode.
' Select DCV function.
' Close channel 102.
' Enable the ratio calculation.
' Read the result of the calculation.
' Set 103 for DCV.
' Set 103 for ratio on.
' Set 105 for TEMP.
' Set 105 for channel average on.