Thresholds; E5404A-Pro Series Single-Ended Soft Touch Probes; E5405A-Pro Series Differential Soft Touch Probe - Agilent Technologies E5406A-Pro Series User Manual

5
Circuit Board Design

Thresholds

E5404A-pro series single-ended soft touch probes

E5405A-pro series differential soft touch probe

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Data inputs
The threshold can be changed on a "per pod" basis (16 data
+ 1 clock). This is accomplished using the "user defined
threshold" window in the logic analyzer software.
Data inputs
If you are using the E5405A differential soft touch probe to
acquire differential signals, you would normally allow the
logic analyzer to discriminate between high and low states
based on the crossover of the data and data inputs.
You may also use the E5405A differential probe to acquire
single- ended signals. If you are using the E5405A probe to
acquire single- ended signals, you should either ground the
data inputs or connect them to a dc power supply. You may:
• Ground the data inputs and adjust the threshold in the
user interface.
Or
• Supply a threshold reference voltage to the data inputs. In
this case, the threshold in the user interface should be set
to zero.
If your circuit uses a resistive divider to provide a threshold
reference, make sure the thevinen equivalent resistance is
around 50 Ω.
The data thresholds can only be changed on a 16-bit per pod basis (16
data). All clock thresholds can be changed individually.
Soft Touch Pro User's Guide