Keithley 6221 User Manual

Model 6220/6221 Reference Manual Delta, Pulse Delta, and Differential Conductance 5-19
Return to Section 5 topics
+411 Diff. Conductance step
error
Occurs if two adjacent Diff
Conductance values use the same
source value. The algorithm to cal-
culate Diff. Cond. voltage divides
by zero and generates a NAN (not
a number) reading (+9.9e37).
This error does not abort the test
but does indicate that corrupt data
has been acquired.
Reduce the number of steps by
increasing the step size or widen
the start-step interval.
+412 Diff. Conductance
upranged
The Model 6221 selects the BEST
range based on the set start, stop,
and step parameters.
For example, if start is -20µA, stop
is +20µA, and step is 1µA, the
Model 6221 will select the 20µA
source range. If using a Delta
value that will cause the last output
value to exceed 21µA, the next
higher range will be selected dur-
ing the arming process.
This is not an error. It is only an
indication that a source uprange
has occurred during the arming
process.
+416 Step size too small Differential Conductance – Occurs
if the step size is so small, it
rounds down to zero. An actual
step size of zero would result in a
test that would never finish.
When using the repeat averaging
filter, the actual step size is the
user entered step size value
divided by the filter count value.
This error occurs during the arming
process. Differential Conductance
will not arm.
Use an actual step size that does
not get rounded to zero.
Avoid using repeat filter that has a
large filter count. Also avoid using a
small start-to-stop span.
+419 Trigger Link cable not
connected
This error occurs during the arm
process.
Make sure the Trigger Link cable is
properly connected.
+809 Not Allowed with
RS-232
Occurs when trying to :ARM Delta,
Pulse Delta or Differential Conduc-
tance with the RS-232 interface
selected for the Model 622x.
Select a different interface and
then arm Delta, Pulse Delta, or
Differential Conductance.
Table 5-2 (cont.)
Error/status codes and messages
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Keithley 6221 Specifications

General

Interface	GPIB, RS-232
Communication Interface	GPIB, RS-232
Current Sourcing Accuracy	±(0.03% of output + 20 pA)
Current Sinking Accuracy	±(0.03% of output + 20 pA)
Output Resolution	100 fA
Output Accuracy	±(0.03% of output + 20 pA)
Power Requirements	100 V to 240 V AC, 50/60 Hz