There are separate lists of probe points for each type of analysis.

To list the probe points, use the bare command `

On start-up, probes are not set. You must do the command `

Syntax for each point is

You can access components in subcircuits by connecting the names with dots. For example:

If the component does not exist, you will get an error message. If the component exists but the parameter is not valid for that type, there will be no error message but the value printed will be obviously bogus.

The options

You can add to or delete from an existing list by prefixing with

For AC analysis, by adding a suffix letter to the parameter, you can get the magnitude

`v`- Voltage.

`z`- Impedance looking into the node.

`logic`-
A numeric interpretation of the logic value at the node. The value is
displayed encoded in a number of the form
*a*.*bc*where*a*is the logic state: 0 = logic 0, 1 = rising, 2 = falling, 3 = logic 1.*b*is an indication of the quality of the digital signal. 0 is a fully valid logic signal. Nonzero indicates it does not meet the criteria for logic simulation.*c*indicates how the node was calculated: 0 indicates logic simulation. 1 indicates analog simulation of a logic device. 2 indicates analog simulation of analog devices.

`lastchange`-
The most recent time at which the logic state changed.

`finaltime`- The scheduled time a pending logic state change will occur.

`vi`- Imaginary part of the voltage.

`vdb`- Decibels relative to 1 v.

`zi`- Imaginary part of the impedance looking into the node.

`zp`- Impedance phase (angle between voltage and current).

`temperature(0)`- The simulation temperature in degrees Celsius.

`time(0)`- The current time in a transient analysis. In AC analysis it shows the time at which the bias point was set, 0 if it was set in a DC or OP analysis, or -1 if it is the bias was not set (power off).

`generator`- The output of the “signal generator”. In a
transient analysis, it shows the output of the signal generator, as set
up by the
`generator`command. In a DC analysis, it shows the DC input voltage (not the power supply). In an OP analysis, it shows the DC input, normally zero.

`iter(0)`- The number of iterations needed for convergence for
this printed step including any hidden steps.

`iter(1)`- The number of iterations needed for convergence for
this printed step not including any hidden steps.

`iter(2)`- The total number of iterations needed since startup
including check passes.

`control(0)`- A number indicating why the simulator chose this
time to simulate at.
- 1 The user requested it. One of the steps in a sweep.

- 2 A scheduled discrete event. An element required a solution
at this time.

- 3 The effect of the “
`skip`” parameter.

- 4 The iteration count exceeded
`ITL4`so the last step was rejected and is being redone at a smaller time step.

- 5 The iteration count exceeded
`ITL3`so the increase in time step is limited.

- 6 Determined by local truncation error or some other device
dependent approximation in hopes of controlling accuracy.

- 7 Determined by a movable analog event. An element required a
solution at this time.

- 8 The step size was limited due to iteration count.

- 9 This is an initial step. The size was arbitrarily set to 1/100
of the user step size.

- 10 + x The previous step was rejected.

- 20 + x A zero time step was replaced by
*mrt*.

- 30 + x The required step size less than
*mrt*, so it was replaced by*mrt*.

- 1 The user requested it. One of the steps in a sweep.
`control(1)`- The number internal time steps. (1 if all steps are printed. One more than the number of hidden steps.)

For components in a subcircuit, the names are connected with dots. For example

Most two node elements (capacitors, inductors, resistors, sources) and four terminal elements (controlled sources) have at least the following parameters available. Others are available for some elements.

`v`- Branch voltage. The first node in the net list is assumed
positive. This is the same as “output voltage”.

`vout`- Output voltage. The voltage across the “output”
terminals.

`vin`- Input voltage. The voltage across the “input”
terminals. For two terminal elements, input and output voltages are
the same.

`i`- Branch current. It flows into the first node in the net
list, out of the second.

`p`- Branch power. Positive power indicates dissipation.
Negative power indicates that the part is supplying power. Its value
is the same as (PD - PS). In AC analysis, it is the real part only.

`nv`- Nominal value. In most cases, this is just the value
which is constant, but it can vary for internal elements of complex
devices.

`ev`- The effective value of the part, in its units. If the part
is ordinary, it will just show its value, but if it is time variant or
nonlinear, it shows what it is now.

`r`- Resistance. The effective resistance of the part, in ohms.
In AC analysis, shows the magnitude of the self impedance. In
`OP`,`DC`or`TRansient`analysis, shows its incremental resistance. In`TRansient`analysis, it shows the effective Z-domain resistance of inductors and capacitors.

`y`- Admittance. 1/
*R*.

`z`- Impedance at a port. The port impedance seen looking
into the circuit across the branch. It does not include the part
itself. In transient analysis, it shows the effective Z-domain
impedance, which is a meaningless number if there are capacitors or
inductors in the circuit.

`zraw`- Impedance at a port, raw. This is the same as “Z” except that it includes the part itself.

`pd`- Branch power dissipated. The power dissipated in the
part. It is always positive and does not include power sourced.

`ps`- Branch power sourced. The power sourced by the part.
It is always positive and does not consider its own dissipation.

`f`- The result of evaluating the function related to the
part. It is the voltage across a resistor, the charge stored in a
capacitor, the flux in an inductor, etc.

`input`- The “input” of the device. It is the current
through a resistor or inductor, the voltage across a capacitor or
admittance, etc. It is the value used to evaluate nonlinearities.

`ioffset`- The offset current in the device. The current
through a nonlinear device can be considered to have two parts: a
passive part and an offset.

`ipassive`- The passive part of the current.

`pi`- Reactive (imaginary) power, volt-amps reactive.

`pidb`- Decibels relative to 1 va reactive.

`pm`- Volt amps, complex power.

`pmdb`- Decibels relative to 1 va.

`pp`- Power phase (angle between voltage and current).

`print ac v(12) v(13) v(14)`- The voltage at nodes 12, 13, and 14
for AC analysis.

`print dc v(r26)`- The voltage across
`R26`, for DC analysis.

`print tran v(r83) p(r83)`- Voltage and power of
`R83`, for transient analysis.

`print dc i(c8) p(r5) z(r5)`- The current through
`C8`, power dissipated in`R5`, and the impedance seen looking into the circuit across`R5`.

`print op v(nodes)`- The voltage at all nodes for the
`op`command.

`print`- List all the probes, for all modes.

`print op`- Display the
`OP`probe list.

`print ac clear`- Clear the AC list.