Hi,
I have run in a .meas error that was non existent in former LTSpice versions. Using the .meas statement to measure a node Voltage works as it should. Also a current measurement of a simple resistor works. But measuring current through a specific port of a device such as a LT317, produces an error in the output log:
C:\Users\name\Desktop\measbug.net(13): Current not found.
.meas I_LT317 MAX Ix(U1:OUT)
^^^^^^^^^^
I wonder if someone could point me to a solution. Or maybe someone could confirm that this is buggy behaviour of this LTSpice version.
Regards
X§U1 N003 N002 N001 LT317A
V1 N001 0 35
R1 N002 N003 100
R2 N003 0 400
I1 N002 0 SINE(20m 10m 50 1.2 0 0 20) AC 1m
C1 N001 0 1µ Rser=1
C2 N002 0 1µ Rser=1
C3 N003 0 1µ Rser=1
.tran 0 3 0 0.0001
.meas V_LT317 MAX V(n002) <--- good
.meas I_LT317 MAX Ix(U1:OUT) <--- error
.meas I_R1 MAX I(R1) <--- good
.lib LT317A.sub
.backanno
.end
LTspice 24.1.7 for Windows
Circuit: C:\Users\name\Desktop\measbug.net
Start Time: Mon Apr 14 22:28:26 2025
solver = Alternate
Maximum thread count: 8
tnom = 27
temp = 27
method = trap
Direct Newton iteration failed to find .op point. (Use ".option noopiter" to skip.)
Starting Gmin stepping
Gmin = 10
Gmin = 1.07374
Gmin = 0.115292
Gmin = 0.0123794
Gmin = 0.00132923
Gmin = 0.000142725
Gmin = 1.5325e-05
Gmin = 1.6455e-06
Gmin = 1.76685e-07
vernier = 0.5
Gmin = 2.96428e-08
vernier = 0.25
vernier = 0.125
vernier = 0.0625
vernier = 0.03125
vernier = 0.015625
vernier = 0.0078125
vernier = 0.00390625
vernier = 0.00195312
vernier = 0.000976562
vernier = 0.000488281
Gmin = 2.96428e-08
Gmin = 0
Gmin stepping failed
Starting source stepping with srcstepmethod=0
Could not converge to DC with sources off!
Starting source stepping with srcstepmethod=1
Could not converge to DC with sources off!
Pseudo Transient succeeded in finding the operating point at 327.969 ms.
Total elapsed time: 5.250 seconds.
Files loaded:
C:\Users\pietw\Desktop\measbug.net
C:\Users\pietw\AppData\Local\LTspice\lib\sub\LT317A.sub
C:\Users\pietw\Desktop\measbug.net(13): Current not found.
.meas I_LT317 MAX Ix(U1:OUT)
^^^^^^^^^^
