Model 6487 Reference Manual Measurements and Sourcing Voltage 3-29
A) OHMS:AVOLtage[:ARM]
This command arms the A-V ohms mode. Once this command is sent, the next INIT com-
mand starts A-V readings. Sending this command, if there are normal readings in the
buffer, results in error -225 “Out of Memory”. Use TRAC:CLEar to clear out the buffer. If
there are A-V ohms readings in the A-V buffers, this command will automatically clear
those buffers in preparation for the next run if the OHMS:AVOL:CLEar:AUTO state is
true. Note that ARMing the A-V ohms mode will also set the source value to zero and turn
operate on. The ARM command is not allowed if the picoammeter is in auto range
(CURR:RANG:AUTO ON); attempting to send the ARM command if autoranging results
in error +852 “No A-V ohms with Autorange”. If the combination of integration time and
programmed TIME interval would result in more than the maximum 1,000 readings per
phase, error +853 “Too Many A-V Ohms Readings” is returned.
The :ARM? query returns a “1” if A-V ohms has been armed even if the unit is still in the
idle state (See Section 7).
klqb We strongly recommend that no commands except for the INIT be sent after
sending the OHMS:AVOL:ARM command.
B) OHMS:AVOLtage:ABORt
This command closes the A-V buffer and resets the source value back to 0V. The source is
also placed in standby.
C) OHMS:AVOLtage:VOLTage <NRf>
This command sets the positive voltage. During each A-V cycle, the voltage source level
alternates between 0V and this programmed value.
D) OHMS:AVOLtage:TIME <NRf>
This command sets the time interval in seconds that the source will be in each phase. The
number of readings collected per phase will be determined by the integration period and
trigger delay, if any. Note that changing the time will clear out any A-V buffer data that
has been collected regardless of whether CLEar:AUTO is enabled or not. Sending a time
value that would result in more than the maximum of 1000 readings per phase based on
the present integration time will result in error +853 “Too Many A-V Ohms Readings”.
The default time interval depends on the integration time selected.
60Hz
0.02 PLC 0.1 PLC 1 PLC 6 PLC 60 PLC
Time (milliseconds) 2 4 18 102 1002
50Hz
0.02 PLC 0.1 PLC 1 PLC 5 PLC 50 PLC
Time (milliseconds) 2 4 22 102 1002
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