7-4 Range, Digits, Speed, and Filters 2400 Series SourceMeter
®
User’s Manual
Note that 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 other, 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 auto ranging. 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 6, “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 trig-
ger. (See Section 11, “Trigger models.”) This feature is especially useful for situations
with long DUT settling times (such as low current measurements) when several down-
range change cycles from the higher ranges are required.
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 11-1 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 pro-
grammed in the range of 0.000s to 9999.999s.
Auto range limits
Auto range limits are included to support the auto range change mode. For voltage and
current, the upper limit is controlled by the compliance range and cannot be programmed.
For the auto ohms mode, however, the lower limit is adjustable. The lower limit for all
three functions is programmable and must be less than or equal to the upper limit. If the
lower limit is equal to the upper limit, auto ranging is effectively disabled. When auto
ranging is disabled, you can manually change to any range below the lower limit (V, I or
Ohms) or any range above the upper limit (Ohms only).
Setting auto range limits
To set the upper or lower auto range limit press CONFIG or CONFIG respectively,
then use the and keys to set the limit at the ULIMIT or LLIMIT prompt. Remember
that you cannot set the upper limit in the V and I modes, but the unit will display the upper
limit with those two functions.
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