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User manual

ManualsBrandsKEITHLEY ManualsLaboratory & Bench PSUsBench PSU (adjustable voltage) 0 - 20 V 0 - 1 A
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7-4 Range, Digits, Speed, and Filters 2400 Series SourceMeter
®
User’s Manual
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 programmed 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 volt-
age 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 ¹ or CONFIG ƒ respec-
tively, then use the
ß 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.
Limits evaluation
Neither the high limit nor the low limit are evaluated until the unit has switched to
the autorange mode. This means that if the unit is already on a range higher than
the upper limit, or lower than the lower limit when the limit is set, no range change
will occur.
The upper limit is only evaluated if the unit has to upgrade. In other words, if you
are on a range higher than the present upper limit, and the unit autoranges down,
it can still end up on a range higher than the upper limit. The converse is true for
the lower limit.
The upper and lower limits have no meaning until autoranging is turned on, but
the limit will not be evaluated unless the unit has to go through an autorange. If
you are already on the right range when you turn on autoranging, limits will not be
evaluated.