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Model 6487 Reference Manual
data you have collected (easy to do, since STORE is located right next to RECALL).
When working remotely, sending the TRAC:FEED:CONT NEXT command while there
are A-V ohms readings in the buffer will result in a -225 "Out of Memory" error. Send
TRAC:CLEar to clear out the buffer before attempting to store buffer readings.
Command restrictions
When A-V ohms is running, the following commands are locked out. Attempting any of
them returns error +850 "Not Allowed with A-V Ohms."
SENS:CURR:DC:MED:STAT
SENS:CURR:DC:MED:RANK
SENS:CURR:DC:AVER:TCON
SENS:CURR:OHMS:STAT
SENS:CURR:DC:NPLC
SENS:CURR:DC:RANG
SENS:CURR:DC:RANG:AUTO
SOUR:VOLT[:LEV][:IMM][:AMPL]
SOUR:VOLT:STATe
SOUR:VOLT:RANGe
TRAC:FEED
TRAC:FEED:CONT
TRAC:POIN
TRAC:TST:FORM
TRAC:DATA?
SYST:AZER:STAT
DISP:ENAB
Tight timing is crucial to getting reliable results with A-V ohms. Anything that changes
the timing between readings would make it impossible to continue averaging in with any
previously collected readings. Therefore, the following command is locked out from the
GPIB while A-V ohms readings are present in the buffer. You must first clear the buffer
with TRAC:CLEar, otherwise an error +851 "Not allowed with A-V Ohms buffer" will be
generated.
SENS:CURR:DC:NPLC
Over the front panel, pressing any key (for example RATE) that would change one of the
settings associated with this command will automatically cause the buffer to be cleared if
the following conditions are true:
•
•
•
If the buffer is cleared by one of these key presses, a "BUF CLEARED" message will be
displayed. Regardless of whether the buffer gets cleared by the key press (it does not, for
instance, if the OHMS:AVOL:CLE:AUTO setting is true), you also will have to re-enter
the CONFIG-> I | Ω menu to select a new time interval before making another A-V ohms
run from the front panel.
There are A-V ohms readings present in the buffer.
SENS:CURR:OHMS:AVOL:CLE:AUTO is set to OFF.
The front panel ohms mode is set for ALT-VOL.
Measurements and Sourcing Voltage
3-27
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