Teledyne LeCroy VirtualProbe - Manual (Page 10)

VirtualProbe Software
Block Setup Dialog
The Block Setup dialog is displayed when you touch a Block definition button. It is used to configure the
corresponding block in the circuit.
Block Action Checkboxes
When a block is configured for something other than "Ideal Thru," the left-side of the dialog includes a
set of checkboxes that determine how the circuit element defined by the block is handled. There are
effectively three actions defined by these checkboxes:
Remove effects caused by block checkbox - check this when you want the electrical behavior of the cir-
cuit element to be removed from the signal. This is usually referred to as "De-embedding". Use this set-
ting when wanting to remove the effects of fixtures or interconnects that would otherwise not be in the
path between the transmitter and receiver.
Include effects caused by block checkbox - When not seeking to remove the effects caused by a block,
check "Include effects caused by block." Checking this box enables two more selections that will deter-
mine the block action:
Block is present at time of measurement checkbox - check this when the element was in
the circuit when the measurement was taken, and you wish to include its effects in the out-
put of the virtual probe. That is, you are not seeking to either de-embed or emulate: the
block is a real circuit element, and its effects are to be included in the VirtualProbe output.
Block is NOT present at time of measurement checkbox - check this when wanting to
include the effects of a "virtual channel." This is often referred to as "emulating a channel,"
where the S-parameters of a channel are used to build a transfer function that models the
reflections and loss characterized by the S-parameters. A typical use-case for this selection
is when you wish to understand how a signal would look if the path between the trans-
mitter and receiver were to be extended by an interconnect that does physically exist, and
for which you only have an S-parameter model.
Block Type Selector
Ideal Thru - This is the default state. Use this setting when the block is unused or as a placeholder
between other blocks.
Ideal Termination - This choice is only present for the outermost blocks, which correspond to the trans-
mitter and receiver, and sets the termination to 50 ohm.
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