Agilent 2000x Serial function LED does not light

[KD0RC]

I am getting along very well with my new Agilent DSOX 2022A, but I noticed that when I do serial decode, the little LED next to the Serial button does not light up when I press the button (FW Version 2.36).  Digital, Math and Ref all light appropriately.  The LED is functional, because it lights up during the scope boot-up process and also lights up correctly during the front panel LED test process.  I assume that this is just a minor firmware error, but wanted to see if others see the same thing, and wonder if those on v 2.35 and earlier see it as well.

[georgd]

On my DSOX3032 also does not lit serial LED!
FW is 2.36 downgraded to 2.35.

Georg

[FFFF00]

I was confused by this at first. How I see it the LEDs next to those buttons lights up when the knobs are active for a certain function. The serial decode doesn't use the knobs so the LED never lights.

This is also why even if you are using the digital, math, and ref functions at the same time there will only be one LED turned on, the one where the controls are currently active. At least this is how it works on the DSOX 3000 scopes with firmware v2.36.

[MarkL]

I noticed that too on an X3104.  I asked Agilent about it and they said the lights indicate when the position and scale knobs to the right are active.

The serial decode traces are fixed in position and the knobs don't do anything, hence the serial light never comes on.

Not very obvious, IMO, but it's purely cosmetic.

[KD0RC]

I was confused by this at first. How I see it the LEDs next to those buttons lights up when the knobs are active for a certain function. The serial decode doesn't use the knobs so the LED never lights.

This is also why even if you are using the digital, math, and ref functions at the same time there will only be one LED turned on, the one where the controls are currently active. At least this is how it works on the DSOX 3000 scopes with firmware v2.36.

Makes sense - that is probably the answer.  I fooled around with it and you are right - only the one with the active control is lit.

I think it shows the design process.  The light for the active function is initially designed in, then as the FW evolves, the decision is made to only light it for the function with an active control.  Might need a new term here; perhaps 'Vestigial LED'.   

[KD0RC]

I noticed that too on an X3104.  I asked Agilent about it and they said the lights indicate when the position and scale knobs to the right are active.

The serial decode traces are fixed in position and the knobs don't do anything, hence the serial light never comes on.

Not very obvious, IMO, but it's purely cosmetic.

Thanks for the corroboration of FFFF00's response.  I agree, it has no operational affect on the instrument at all.

[Hydrawerk]

At my DSOX2002A the Serial LED also does not glow. This is normal.

[AndyC_772]

Confirmed on my MSO-X3054A too. Personally I think it's stranger that the serial decode display can't be moved, than that the LED doesn't come on.