Why have you not set the scope to show A [...]

The Math channel can't let me set the unit on it, Ohm's law doesn't exist, and if Math channel divides Volts by Resistance, then Scope law's which is above Ohm's law mandates that the result is still Volts

I could force Math channel to be in Amp, if I were to set the C2 (Vdrop at the resistance) to be Amps.

**I very would like to be able to change the Math channel independently, or if the scope would let just enter a suffix string.**I've entered the Steinhart-hart equations in a math channel for the fun, and I had to display the temperature in V.

[...] with the correct scaling ?

The C2 channel was set a 1V/div.

F2 was set at F2=C2/99 (99 Ohm).

So I indeed had the target LED's 20mA, but displayed as 20mV, but if I changed the C2 unit from V->A, then I could have F2 change from mV->mA.

But I wanted the current (~20 mA, or 20mV badly displayed) to be graphed with the 7 full spans on division available in the positive range.

so 20m[A or V] divided by 7 = roughly 3 wheen rounded to ceil.

So I wanted to set F2 to 3 mV vertical div,

**but the scope wouldn't let me go below 5mV**. Without any message, even if I had the "coarse" unchecked, when I entered something below 5milli, it raised it up to 5milli.

Attached is a picture when I set back F2=C2/99, then I can't set F2 vertical div to below 5mV. When I lower it, it ignores it and briefly writes a big 5mV in White in the bottom center of the screen.

So I changed F2 from F2=C2/99 to F2=C2/0.099 and set the vertical div of F2 from 3mV(impossible minimum 5mV) to 3V.

Ah and in the oddities, the Steinhart-hart equation is something along :

`// let a, b, and c be three coefficients which to me, may as well have been determined by black magic`

F3=ln(voltage)// natural log, not log10 // F4 and math channels have a string length limit, so I have to use a temporary channel to reduce size

F4=a + b*F3 + c*F3*F3*F3

**The scope wouldn't allow have F3 be cube'd to the power of 3.**So It worked with the mathematically-equivalent of factorized :

`F4=a + F3*(b + c*F3*F3)`

And somehow it accepted it, like if we weren't anymore be ^3 a chan source.

I guess that it comes from limit in the math operations accepted by whatever chips calculate the maths (FPGA ?).

Probably the FPGA cannot do F3*F3*F3, probably it can do F3*F3*(F3+0). Or something along those lines.

I guess square/square root are often used in the electrical domains, cube/cube root less often, and I wanted to ^3 but it was for something probably rarely usefull on a scope.