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Here's an easy question for ya'll.? In the Wiki FAQ it says about ESD protection "Make sure you have FW v1.3-3 or later. Go to CONFIG/VERSION. If the last line of the displayed version info is "ESD protected" the diodes are installed."

My vendor was Seesii via Amazon and unit was purchased March 15th.? I've updated the FW to the current .156 and it passes all selftests and calibration so hoping it's not a clone.? I look at the last line of the version info and don't find the ESD Protected.? This is the version screen.? I'm assuming it's not ESD protected.? Why were the protection diodes dropped in the later HW versions?

Thank ya'll for all the info I've learned from this group.

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73 de Ken H> K9FV

All tinySA Ultra have always had ESD protection
Happy you do read the wiki :-)
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In a thread about the antenna attachment, I thought you said something about the antenna being a potential (no pun intended) ESD risk. Can you fill that in a little, please?

73
Rick
KC3DOO

On Mon, Mar 25, 2024 at 03:44 PM, Richard B. Emerson wrote:

In a thread about the antenna attachment, I thought you said something about the antenna being a potential (no pun intended) ESD risk. Can you fill that in a little, please?

73
Rick
KC3DOO

I'm trying not to get drawn into this but…. Just because a unit has an ESD protected input, does not mean it suddenly becomes totally immune to ESD or input Voltage overload damage. It just gets a little bit less susceptible than it was before. It’s still highly ESD vulnerable. All such SA equipments are, at any price.

To anyone who knows it is pretty obvious that a simple exposed metal antenna connected straight to the SA input is going to be highly vulnerable. Just touch it accidentally and momentarily to something that is floating at maybe half grid voltage (many non earthed SMPS products for instance?) or to earth whilst TinySA is being charged by such a grid floating USB power supply. As with full size analysers and scopes costing many thousands, due diligence still needs to be applied. Peter

On Mon, Mar 25, 2024 at 09:28 AM, Prawlin wrote:

Just because a unit has an ESD protected input, does not mean it suddenly becomes totally immune to ESD or input Voltage overload damage. It just gets a little bit less susceptible than it was before. It’s still highly ESD vulnerable. All such SA equipments are, at any price.

Peter,

Good points.?

The type of protection device(s) will determine what level of Electrostatic discharge (ESD) can be tolerated.



The tinySA needs to use low capacitance protection devices on the front end because it has a very high frequency input requirement.? Low capacitance parts limit the degree of ESD protection and so users need to be careful.? Walking across a nylon carpet in the winter with an antenna connected to the tinySA is asking for trouble.

Roger

On Mon, Mar 25, 2024 at 05:28 PM, Roger Need wrote:

Walking across a nylon carpet in the winter with an antenna connected to the tinySA is asking for trouble

At work one of my technicians was checking a UHF dipole in the workshop, he blew the input to a Bird antenna analyzer. This was in a relatively static free environment with the dipole in the workshop itself. That was a costly repair!

Short out the antenna plug centre and touch the outer to the outer of the SA (or VNA) socket immediately before connecting the instrument. It is a good habit to get into.

73 Dave