Keithley 6482, Reference Manual

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7-6 Return to Section Topics 6482-901-01 Rev. A / August 2012
Section 7: Sweep Operation Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
With the INIT option, you can set a consecutive range of measurement points in the
sweep to a specific level. For example, assume that for a 20-point custom voltage sweep
(# POINTS = 20), you want points 10 through 15 to be set for 1 V. After selecting the INIT
option, set the VALUE to +1.000000 V, set the START PT to 10, and set the STOP PT to
15.
• SWEEP-COUNT : Use this menu item to specify how many sweeps to perform:
– CUSTOM – With the custom sweep selected, you specify the number of measurement
points (#-POINTS) in the sweep and the source level at each point (ADJUST- POINTS).
– FINITE – Use this option to enter a discrete number of sweeps to perform with the
results stored in the data store buffer. The maximum number of finite sweeps that can be
performed is determined as follows:
Maximum finite sweep count = 3000 / # points in sweep
– INFINITE – Select this option to continuously repeat the configured sweep. Use the EXIT
key to stop the sweep. Data is not stored in the buffer.
• SOURCE-RANGING : Use this menu item to control voltage bias source ranging:
– BEST-FIXED – With this option, the Model 6482 will select a single fixed source range
that will accommodate all of the source levels in the sweep. For example, if the minimum
and maximum source levels in the sweep are 1 V and 30 V, the 30 V source range will be
used.
– AUTO-RANGE – With this option, the Model 6482 will select the most sensitive source
range for each source level in the sweep. For example, for a 1 V source level, the 2 V
source range will be used, and for a 3 V source level, the 30 V source range will be used.
Note that the range changing process of AUTO-RANGE may cause transients in the
sweep. If these transients cannot be tolerated, use the BEST- FIXED source range.
– FIXED – With this option, the source remains on the range presently on when the sweep
is started. For sweep points that exceed the source range capability, the source will out-
put the maximum level for that range. For example, if the source is on the 2 V range
when the sweep is started, it will remain on the 2 V range for the entire sweep. If the con-
figured sweep points are 1 V, 2 V, 3 V, 4 V, and 5 V, the sweep will be 1 V, 2 V, 2.1 V, 2.1
V, and 2.1 V.
Figure 7-5
Sweep configuration menu tree
Setting delay
Generally, the time duration spent at each step (or point) of a sweep consists of the source delay
and the time it takes to perform the measurement (NPLC setting).
Config
Sweep
Type
Sweep
count ranging
Log Stair Custom Infinite Finite
Best
fixed
Fixed
Auto
range
None
Source