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Metrology Grade adapters - HP/Agilent 1250-1745 and 1250-1740 - insertion loss ?

 

Hi all,

I've been looking to add an HP/Agilent 1250-1745 and 1250-1740 to my kit so I can step down my power sensors to 3.5mm/SMA for various test.

What I don't see in the catalog for the adapters, and I cant find after spending a hour or so googling around, is a specification of insertion loss.

So does any know what the insertion loss is for both the 1250-1745 and 1250-1740 ?

Or, if someone has the equipment, can you measure yours and let me know ?

I don't imagine the IL for these isn't much, probably fractions of a dB, but I'd like to know what it is, especially at 10GHz.

thanks

Tim
 

Tim -

Assuming you mean 1250-1745 and -1750, these are both part of the 85033E/400 kit. Any published specifications are in that manual, downloadable from Keysight. They are only spec'd for mechanical dimensions and return loss, the latter of which is listed as a minimum of 28dB and 24dB from DC to 18Ghz for the -1745 and -1750, respectively. Therefore best case insertion loss is 0.01dB and 0.02dB, respectively. Actual insertion losses will be slightly higher due to losses in the adapters themselves not reflected. Can this be zeroed out using the calibrator on your power meter?

Dave Casey


On Wed, Mar 4, 2020 at 11:04 PM Tim Tuck <timt@...> wrote:
Hi all,

I've been looking to add an HP/Agilent 1250-1745 and 1250-1740 to my kit
so I can step down my power sensors to 3.5mm/SMA for various test.

What I don't see in the catalog for the adapters, and I cant find after
spending a hour or so googling around, is a specification of insertion loss.

So does any know what the insertion loss is for both the 1250-1745 and
1250-1740 ?

Or, if someone has the equipment, can you measure yours and let me know ?

I don't imagine the IL for these isn't much, probably fractions of a dB,
but I'd like to know what it is, especially at 10GHz.

thanks

Tim
 

¿ªÔÆÌåÓý

Hi Dave,

Yes, I meant 1750 not 40, typo :) they are parts of many cal kits and available separately too. I've found the part numbers in various HP adapter catalogs and manuals but no indication of IL and I thought that was curious.

I can offset a loss in the power meter as long as I know what that loss is. If the IL is as small as you say then that is within the margin of error for the meter & sensor combination and I could probably ignore it for most measurements.

I just thought it was interesting that for a high grade adapter there was no mention of IL.

regards

Tim

On 5/03/2020 5:28 pm, Dave Casey wrote:

Tim -

Assuming you mean 1250-1745 and -1750, these are both part of the 85033E/400 kit. Any published specifications are in that manual, downloadable from Keysight. They are only spec'd for mechanical dimensions and return loss, the latter of which is listed as a minimum of 28dB and 24dB from DC to 18Ghz for the -1745 and -1750, respectively. Therefore best case insertion loss is 0.01dB and 0.02dB, respectively. Actual insertion losses will be slightly higher due to losses in the adapters themselves not reflected. Can this be zeroed out using the calibrator on your power meter?

Dave Casey

On Wed, Mar 4, 2020 at 11:04 PM Tim Tuck <timt@...> wrote:
Hi all,

I've been looking to add an HP/Agilent 1250-1745 and 1250-1740 to my kit
so I can step down my power sensors to 3.5mm/SMA for various test.

What I don't see in the catalog for the adapters, and I cant find after
spending a hour or so googling around, is a specification of insertion loss.

So does any know what the insertion loss is for both the 1250-1745 and
1250-1740 ?

Or, if someone has the equipment, can you measure yours and let me know ?

I don't imagine the IL for these isn't much, probably fractions of a dB,
but I'd like to know what it is, especially at 10GHz.

thanks

Tim
 

HPAK don't quote insertion losses for precision adaptors bigger than 1mm. One must assume they are insignificant?compared to the return loss / SWR.

Robert G8RPI.

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