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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.
Summary of Contents for 6430
Page 26: ......
Page 32: ......
Page 78: ...2 14 Connections ...
Page 98: ...3 20 Basic Source Measure Operation ...
Page 138: ...5 30 Source Measure Concepts ...
Page 156: ...6 18 Range Digits Speed and Filters ...
Page 168: ...7 12 Relative and Math ...
Page 176: ...8 8 Data Store ...
Page 202: ...9 26 Sweep Operation ...
Page 248: ...11 22 Limit Testing ...
Page 310: ...16 6 SCPI Signal Oriented Measurement Commands ...
Page 418: ...17 108 SCPI Command Reference ...
Page 450: ...18 32 Performance Verification ...
Page 477: ...A Specifications ...
Page 489: ...B StatusandErrorMessages ...
Page 498: ...B 10 Status and Error Messages ...
Page 499: ...C DataFlow ...
Page 503: ...D IEEE 488BusOverview ...
Page 518: ...D 16 IEEE 488 Bus Overview ...
Page 519: ...E IEEE 488andSCPI ConformanceInformation ...
Page 523: ...F MeasurementConsiderations ...
Page 539: ...G GPIB488 1Protocol ...
Page 557: ......