===DC Sensitivity Test===
A DC Sensitivity Test calculates the sensitivity of the output port to all the device values and model [[parameters]] at the circuit's operating point. Sensitivity is defined as the derivative an observable like a node voltage with respect to a parameter value such as the resistance of a resistor. In other words, it gives a measure of the variation of the voltage due to a small variation in the value of a part parameter. The output port for sensitivity calculation is specified by a pair of positive and negative (reference) nodes.
{{Note | In order to view the node numbers in your circuit, check the "Show Node Numbers" option in the View Menu or use the keyboard shortcut "Ctrl+Alt+N".}}
The results of a DC sensitivity test are displayed in a table window. The left column of the table lists the part [[parameters]] and the right columns shows the derivative of the output voltage with respect to the respective [[parameters]]. For example, consider the simple voltage divider circuit of Tutorial lesson No. 1, which consists of a 1V DC voltage source in series with a 1k resistor and another 2k resistor. The output voltage is designated as the voltage across the 2k resistor. The results of the DC sensitivity test for this circuit indicate that the output voltage is increased by 666.66mV for every 1-volt increase in the input source voltage, it is decreased by -1.111 mV for every 1 Ohm change in the first resistor's value, and it is increased by 555.55 microvolts for every 1 Ohm change in the second resistor's value. Note that these are all small-signal operating point results.
===Device Output Parameters Test===