EEVblog Electronics Community Forum

Products => Test Equipment => Topic started by: AndersJ on August 05, 2018, 04:55:49 pm

Title: What this is?
Post by: AndersJ on August 05, 2018, 04:55:49 pm
Does anyone know what this device is/does?

(https://www.eevblog.com/forum/testgear/what-this-is/?action=dlattach;attach=491198)
Title: Re: What this is?
Post by: jeroen79 on August 05, 2018, 05:37:55 pm
Something that outputs 2 times more "cavins" than you put in?

Can you show some pictures of the insides?
Title: Re: What this is?
Post by: glarsson on August 05, 2018, 05:47:42 pm
Or something that reduces the signal and the user should therefore multiply readings by two. Very confusing little box.
Title: Re: What this is?
Post by: iainwhite on August 05, 2018, 05:53:30 pm
Some kind of RF attenuator ??
Title: Re: What this is?
Post by: Discotech on August 05, 2018, 05:56:29 pm
Branson are/were an ultrasonic company, I wonder if cavin is their own term for measuring ultrasonic cavitation ?
Title: Re: What this is?
Post by: helius on August 05, 2018, 06:20:16 pm
Cavins are a measure of relative cavitation activity. See https://www.mrclab.com/data/products/Cav-meter-2_OPR.pdf (https://www.mrclab.com/data/products/Cav-meter-2_OPR.pdf) a cavitation meter.
Still unclear on what the device in the OP does. An attenuator?
Title: Re: What this is?
Post by: SeanB on August 05, 2018, 07:08:10 pm
I would guess a 3dB attenuator, giving a voltage output half the input, so that you can keep a meter in range while you are having a higher voltage output from whatever detector you are using. Standard instrument box, if you undo the 4 screws and look inside there will be a simple voltage divider, probably using 3 resistors, to give the attenuation and provide the required input and output impedances constant, or there will be a small ferrite autotransformer in some cases where they have a well defined operating frequency and impedances.
Title: Re: What this is?
Post by: DimitriP on August 05, 2018, 07:40:42 pm
It's a patience test box.  It tests the amount of time before the four screws come off to take a peek inside. You just might be holding the record so far!!
Title: Re: What this is?
Post by: tomato on August 05, 2018, 08:00:17 pm
Quote from: SeanB on August 05, 2018, 07:08:10 pm
I would guess a 3dB attenuator, giving a voltage output half the input...

That would be 6 dB.
Title: Re: What this is?
Post by: AndersJ on August 06, 2018, 11:29:11 am
The patience test box has now been taken apart before it was turned on.

(https://www.eevblog.com/forum/index.php?action=dlattach;topic=130226.0;attach=491684;image)

Anders J
Proud record holder