Recalling A-V Ohms Readings - Keithley 6487 Reference Manual

3-24 Measurements and Sourcing Voltage
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Recalling A-V ohms readings

Over the front panel, you can view both amps and ohms A-V readings during the recall
process. To do so, press the RECALL key, then use the and
amps, ohms, voltage source, and time values for each reading. Use the RANGE and
keys to cycle through individual readings or buffer statistics, which are calculated on the
basis of the amps readings (see
Note that the maximum current will result in a minimum ohms reading and vice-versa.
The MIN reading applies to the minimum current (maximum ohms), while the MAX read-
ing applies to the maximum current (minimum ohms).
Expressing the standard deviation in ohms is not meaningful; therefore it cannot be
viewed in ohms and will always show a blank ("---------"). The same applies for the Pk-Pk
display. Average will be converted to ohms.
Set the desired number of A-V cycles, then press ENTER. The unit will prompt
you as to whether or not you wish to clear the buffer automatically when a new
A-V measurement is started:
AUTOCLEAR: Y
Select Y or N as desired, then press ENTER.
At this point, the voltage source is in operate at 0V and the unit displays the
message TRIG TO STRT.
To start storing A-V ohms readings, press the TRIG key. The asterisk (*) character
will turn on to indicate the A-V readings are being stored. It will turn off when
storage is complete.
To halt the A-V process, press the EXIT key once. The voltage source turns off
and the I|¾ TO REARM message will display. A second press of the EXIT key
takes you back to the normal reading display. From this reading display, you can
still press the I|¾ once and the A-V ohms sequence will again be armed.
Alternatively from this reading display, press CONFIG → I|¾ and change the
selection back to NORMAL to take regular (not A-V) ohms readings.
Pressing the EXIT or OPER key while A-V ohms is in progress will cause the
message I|¾ TO REARM to appear.
Figure 3-8 for recall sequence).
Model 6487 Reference Manual
cursor keys to cycle among