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Re: 8594E input attenuator issue?


 

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BTW, I was wrong about a 40 dB section, which I discovered after looking at the Service Guide. There is such a section in that model. I suspect that since it only had to meet performance specs up to 2.9 GHz, the leakage wasn¡¯t a big issue. I am usually dealing with frequencies at 10 GHz or higher and that was what I was thinking here. Sorry.

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From: [email protected] <[email protected]> On Behalf Of n8zmTWH@...
Sent: Thursday, January 20, 2022 2:46 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?

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The through readings will vary with the value of the attenuation, but the to-ground readings should all be close to 50 Ohms with a 50 Ohm termination in place, as you said you did.

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I took a quick look on Keysight¡¯s website for that model of attenuator, and it is obsolete. There doesn¡¯t seem to be a replacement recommendation. I ran out of time but will dig a little deeper to see if the substrates are still available for it.

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Tom.

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From: [email protected] <[email protected]> On Behalf Of Nicolas Mailloux
Sent: Thursday, January 20, 2022 12:30 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?

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Ozan?: These measurements are from input to output.

PAD 2 : 81.69 ohm

PAD 3 : 98.04 ohm

PAD 4 : 51.65 ohm

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These are from input to ground :

PAD 2 : 51.05 ohm

PAD 3 : 49.95 ohm

PAD 4 : 60.96 Ohm

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There are from output to ground :

PAD 2 : 51.10

PAD 3 : 50.16

PAD 4 : 61.23

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From: [email protected] <[email protected]> On Behalf Of Ozan
Sent: 20 janvier 2022 12:08
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?

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On Thu, Jan 20, 2022 at 07:58 AM, Nicolas Mailloux wrote:

n8zmTWH@... : I do not have/searched the schematics of my particular ATT. I based my assumptions on a previous post from someone that attached schematics. They may not be the right ones.

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My exact model number is : 33321-60036 it goes to 70dB I think. My 8594E is from 9kHz to 2.9GHz.

Measuring the pads where the contact blades touch when selected, still in the aluminum block I get these readings :

They are in order from Input to Output.

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PAD 2 : 81.69 ohm

PAD 3 : 98.04 ohm

PAD 4 : 51.65 ohm

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Both service manual and CLIP show 10dB/20dB/40dB sections.

The pads have three terminals, input/output/ground (input/output being symmetric). Ground is connected to the metal frame. ?Are above resistance measurements from one pad to ground? It may or may not tell much but what resistance do you measure from each side to ground??

Ozan

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