[time-nuts] Noise down-converter project

[Mike Monett]

Adrian Godwin wrote:

>It looks identical to my Agilent U1732B, thjough I think the
>Agilent's spec is poorer. It was replaced by a U1732C which may be
>closer thjough both are going back a way now. Presumably Agilent
>badged it and it has continued to improve. I don't know whether
>there's a corresponding Keysight version.

The U1732B looks similar to the Tonghui TH2822A, with an upper limit
of 10KHz. The Keysight U1733C and Tonghui TH2822C both go to 100KHz,
which is essential to measure small RF components.

I don't know What is the difference between the Agilent U1732C and
U1733C. They look very similar, so I'll go with the U1733C.

The Keysight U1733C looks similar to the Tonghui TH2822C but is a
very different instrument. It only has a SMD probe, but has provision
for Kelvin Clips which you have to purchase separately. It uses a 9V
alkaline whereas the Tonghui is rechargeable. 

I prefer the rechargeable feature since the power lasts longer, and
you don't have to keep a stock of alkalines on hand, where they can
be stolen or otherwise disappear just when you need one. You only
have to plug the charger in and you're back in business. Many
instruments still function while they are being charged.

The Keysight U1733C is also much more expensive, clocking in at
C$764.50 vs C$170.10 for the Tonghui.

The Keysight U1733C is available at many distributors:

1. CAD
  https://octopart.com/search?q=Keysight+U1733C&currency=USD&specs=0

2. USD
  https://octopart.com/search?q=Keysight+U1733C&currency=CAD&specs=0

The manual is available at

https://www.keysight.com/us/en/assets/9018-03486/quick-start-guides/9018-03486.pdf