Keithley 237

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SECTION3
IEEE-488 Reference
3.6.13 0- Output Sense
Purpose
Format
Parameters
Default
Description
Programming
Notes
Programming
Example
To select local or remote output sensing.
On
00
01
Local sense for V -source feedback and measurement
Remote sense for V -source feedback and measurement
Upon power-up, or after receiving a DCL, SOC, or JOX command, the instrument de-
faults to 00 (local sense).
The 0 command selects local or remote sensing. Local sensing is performed at the
output connections of the Source Measure Unit; remote sensing is performed at the
load by external sense leads.
WARNING
You must connect the sense leads before program-
ming remote sensing. Failure to do so causes a safety
hazard with potentially lethal voltages at OUTPUT
HI and it's GUARD, and the GUARD surrounding
SENSE HI.
When sourcing voltage and measuring current with remote sensing, the sense leads
provide a feedback voltage. If the feedback voltage is less than the programmed volt-
age,
the internal voltage source is increased until the voltages are equal. Remote
sensing compensates for test lead 1/R drops, ensuring that the programmed voltage
level
is delivered to the load.
When sourcing current and measuring voltage with remote sensing, the voltage
reading is the actual voltage drop across the load. Test lead 1/R drops are not in-
cluded in the reading.
As a general rule, remote sensing should be used when source and/ or measurement
levels may develop significant 1/R drops.
In standby mode, the instrument is set internally to local sense. For applications
where guard is switched, program the unit to local sense before the switch occurs to
allow for safe switching.
10
20
OUTPUT 716; "01X"
OUTPUT716; "OOX"
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! Select remote sensing.
! Select local sensing.
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