Keithley 6430 User Manual

6-4 Range, Digits, Speed, and Filters
Auto ranging
For the Source V Measure I, Source I Measure V, and Ohms configurations, press AUTO
RANGE to enable auto ranging. The AUTO annunciator turns on when auto ranging is
selected. With auto ranging selected, the instrument automatically chooses the best range to
measure the applied signal. Note that the highest available range is dependent on the corre-
sponding compliance setting. See Ranging limitations.
NOTE With the median filter enabled, auto ranging could be very slow. See “Median filter”
(in this section) for details.
Source settling time can affect the time it takes the instrument to auto range. When
the instrument auto ranges, both the source and sense circuits monitor each another,
so if one takes longer to settle, the other will as well.
Auto range change mode
The auto range change mode determines how the instrument performs autoranging. In the
SINGLE mode, the SourceMeter will auto range only after first taking a reading. In the
MULTIPLE mode, the SourceMeter will auto range up on compliance in the Delay phase of the
Source-Delay-Measure (SDM) cycle, thereby minimizing the possibility that a SourceMeter
will be in compliance in a multiple-SourceMeter system. The SourceMeter can downrange
only once a reading has been taken.
NOTE See Section 5, “Source-delay-measure cycle” for more SDM information.
With the auto range change mode set to MULTIPLE, you can also program the soak time,
which specifies the amount of time after the first point of a sweep that the unit will sit in a loop
actively auto ranging up and down to allow a multiple SourceMeter configuration to settle. This
process will occur only during the first SDM cycle after the initial sweep trigger. See
Section 10, Trigger model. This feature is especially useful for situations with long DUT set-
tling times (such as low current measurements) when several down-range change cycles from
the higher ranges are required.
NOTE The soak time takes the place of the delay time only during the delay phase of the
first SDM cycle after an initial sweep trigger. See Figure 10-1 for an overview of the
trigger model.
Selecting the auto range change mode
To configure the auto range change mode, press CONFIG then AUTO. Choose SINGLE
SRC MTR or MULTIPLE as desired from the AUTO RANGE TYPE menu. If you choose
MULTIPLE, you will also be prompted to enter the SOAK time, which can be programmed in
the range of 0.000s to 9999.999s.

Keithley 6430 Specifications

General

Brand	Keithley
Model	6430
Category	Measuring Instruments
Language	English