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Chapter 2: Probing and Selecting the Sampling Mode
Probing the Device Under Test
You can order mating connectors separately using the Agilent part
number:
• 1253-3620 (or Samtec #ASP-65067-01)
You can order support shrouds separately using the Agilent part
numbers:
• 16760-02302 for PC board thicknesses up to 0.062 in.
• 16760-02303 for PC board thicknesses up to 0.120 in.
Electrical
Considerations
Data threshold reference inputs
The E5378A single-ended probe has two inputs for threshold reference
voltages for the data inputs. One input is for the even pod and the
other is for the odd pod. The threshold inputs (pins 87 and 88) may be
either:
Connected to a DC threshold reference voltage. In this case, the logic
analyzer will use the threshold reference voltage to determine when the
signal is high or low.
Or:
Grounded or left unconnected. In this case, you need to set the logic
threshold voltage in the user interface.
The advantages of supplying a threshold voltage via the threshold input
on the probe are:
• A threshold voltage supplied from the device under test will typically track
changes in supply voltage, temperature, etc.
• A threshold voltage supplied from the device under test is typically the
same threshold that the device's logic uses to evaluate the signals.
Therefore, the data captured by the logic analyzer will be the same as the
data interpreted by the device under test.
Clock Input
The clock input on the E5378A probe can be a differential signal or a
single-ended signal.
If the clock input is a differential signal, select the "differential" option
in the clock threshold user interface.