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How do I measure voltage between two nodes when neither of them is ground? In the schematic below, I want to measure the voltage between nodes Vmic and Vx. Is it just (Vmic-Vx)? I'm afraid that gives a wrong answer.

enter image description here

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3 Answers 3

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You can use .meas Vmicpk MAX(V(Vmic)-V(Vx))*1000

Is it just (Vmic-Vx)?

Vmic and Vx are node names and not voltages.

The voltages associated with each node are V(Vmic) and V(Vx)

The difference voltage between the two nodes is V(Vmic)-V(Vx)

Then multiply by 1000 if that's what you want.

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  • \$\begingroup\$ Thank you for the answer. \$\endgroup\$
    – blackblade
    Jan 29 at 13:24
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    \$\begingroup\$ You can also use V(Vmic,Vx). \$\endgroup\$
    – Hearth
    Jan 29 at 20:39
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In addition to the other answers, in LTspice you can identify in any command the voltage across two nodes with the syntax

V(node1,node2)

which in your case becomes

V(Vmic,Vx)
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  • \$\begingroup\$ That will be useful for quick analysis. Thank you. \$\endgroup\$
    – blackblade
    Jan 29 at 13:25
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Use a differential voltage probe.

Click on the first node, and drag to the second node.

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  • \$\begingroup\$ Nice. This can be used when viewing simulation window. \$\endgroup\$
    – blackblade
    Jan 29 at 13:24

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