[time-nuts] Noise down-converter project

[Mike Monett]

On Tue, 24 May 2022, I posted the following:

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Ed,

You spoke of difficulty measuring inductors. There are quite a few LCR
meters on the market that offer the performance needed in your project.
Here are three:

1. TH2822C Handheld LCR Meter counts/Accuracy
0.25%/100Hz,120Hz,1kHz,10kHz,100kHz
CAD$293.91
https://www.aliexpress.com/item/32429957886.html
- Watch out for counterfeits on asian sites

TH2822C Handheld LCR Meter 
USD$339.00
https://www.amazon.com/TH2822C-Handheld-Meter-Frequency-100kHz/dp/B07H68D1DP

TH2822C PORTABLE handheld Pro LCR
USD$371.48
eBay item number:281423062278
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I elected to buy one from the actual Shenzhen Measuring Instruments
Store to avoid counterfeits. When I ordered it, the price was
C$433.02. As I was checking for the delivery date, I noticed the
price had dropped to C$170.10, a drop of -61%. Shipping is C$40.94
plus duty via DHL. Be advised you will need a cellphone to deal with
DHL.

This is one of the most powerful handheld LCR bridges on the market
with an accuracy of 0.25% and covers the range of 100Hz, 120Hz,
1kHz, 10kHz, and 100kHz. This is one of the largest ranges for this
class of instrument and allows you to measure the largest and
smallest components available. You can find it at:

https://www.aliexpress.com/item/32429957886.html

The Kelvin Clips are C$46.22 with free shipping:

https://www.aliexpress.com/item/4001038783823.html

You need the Kelvin Clips to take advantage of the 0.25% accuracy. A
big advantage of the TH2822C is the ability to average the readings,
which allows you to take full advantage of the Kelvin Clips.