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.
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\$\begingroup\$ related, possibly a duplicate: electronics.stackexchange.com/questions/204096/… \$\endgroup\$– PlasmaHHJan 29 at 20:31
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3 Answers
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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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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\$ 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\$ Jan 29 at 13:24