GUI app for controlling the immittance meter E7-28, conducting experiments, measurements, plotting graphs and saving results in different formats.

Protocol

rs232; baud rate: 9600; paritet: false; stop: 1

app->lcr 0xAA, NUM_COMMAND, [parameters]

lcr->app 0xAA, NUM_COMMAND, [parameters]

Commads

Command	APP ask	LCR answer	Info
lcr name	0xAA, 64	0xAA, 64, "E728"
turn on avp	lcr (0xAA, 65)	lcr (0xAA, 65)
turn off avp	(0xAA, 66)	(0xAA, 66)
set frequency	(0xAA, 67, f4, f3, f2, f1)	(0xAA, 67)	f1, f2, f3, f4 - 4 bytes of integer number
set bias	(0xAA, 70, U1, U0)	(0xAA, 70)	U1, U0 - 2 bytes (int16) * 10
reset	(0xAA, 71)	(0xAA, 71)
get info	lcr (0xAA, 72, 0)	(0xAA, 72, flags, mode, slow, diap, U1, U0, f3..f0, Z3..Z0,fi3..fi0)	see below \/
...	...	...	...

Get info command

flags: bits
    0 - AVP
    1 - Current (not available)
    2 - Restart
    3 - Parameter autoset
    4 - Equivalence circuit (1-parallel, 0-series)
    7 - The measurement cycle is complete
mode: parameter from leyboard?
    0- F1..3- F2
slow: measurement speed
    0 - fast
    1 - normal
    2 - averaging over 10
diap: measurement range
    0 - 10 MOm
    1 - 1 MOm
    2 - 100 kOm
    3 - 10 kOm
    4 - 1 kOm
    5 - 100 Om
    6 - 10 Om
    7 - 1 Om
Uсм1, Uсм0: 2 bytes (int16) * 10
f3..f0: 4 bytes (int32) working frequency
f3..f0: 4 bytes (float) complex impedance module for the final equivalent circuit
fi3..fi0: 4 bytes (float) phase angle for the last equivalent circuit

real, float is transferred to radians (fi*57.2957795)

|Y| = 1/|Z|; fiy = -fiz(parallel equivalent circuit)
Rs = |Z|*Cos(fiz); Xs = |Z|*Sin(fiz)
Gp = |Y|*Cos(fiy); Bp = |Z|*Sin(fiy)
Rp = 1/Gp; Xp = 1/Bp
Gs = 1/Rs; Bs = 1/Xs
C = 1/2*pi*f*X; L = 2*pi*f*X

TODO:

• - connection with simple script
• - collect all byte-commands
• - draw simple gui with main functional
• - mode switcher
• - plots

to be continue...

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pyside

# run qt-designer
pyside6-designer

# convert ui to python code
pyside6-uic main.ui -o ui_main.py