vintage esr meter kit project - Page 1
Forum section: electronics / projects

author: strawberry
author_rank: Super Contributor
timestamp: March 12, 2022, 08:36:25 pm
content: 1mohm ... 100ohm range20mV OCV~1% accuracy or better4dig displayTH partscard edge connectors

author: m3vuv
author_rank: Super Contributor
timestamp: March 12, 2022, 09:39:14 pm
content: so what is the point of the post,are you asking something?,otherwise seems a waste of eev bloggs server hd space!!

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: March 12, 2022, 09:45:28 pm
content: Hi,That is one of the PCBs from this meter:It is this board:Image taken from here:https://www.qsl.net/n9zia//hp4328a/index.htmlAre you making a similar unit with a digital display?The original version of the HP4328A works at 1kHz.Regards,Jay_Diddy_B

author: m3vuv
author_rank: Super Contributor
timestamp: March 12, 2022, 10:39:04 pm
content: so is it an esr meter or not?

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: March 12, 2022, 10:57:25 pm
content: Quote from: m3vuv on March 12, 2022, 10:39:04 pmHi,It as an AC milli-Ohmmeter, it is capable of measuring ESR, but at a frequency of 1kHz. It uses sine waves and a synchronous rectifier to measure the in-phase component of the impedance.It was designed by YHP. YHP was a joint venture between Hewlett Packard and Yokogawa. A lot of HP LCR meters, like 4274A and 4275A were designed and built by YHP. You can see a slight differences in style and component choices between YHP and HP instruments.The HP 4328A uses transformers to couple the drive signal and the measurement.Regards,Jay_Diddy_B

author: floobydust
author_rank: Super Contributor
timestamp: March 12, 2022, 11:24:05 pm
content: It looks like a recreation of the original Phase Sensitive Amplifier PC board 4328A-7022 ? Tape and all. Maybe as a non-fungible tokenI don't think you would do a remake of the whole instrument- it has many custom magnetics (4 transformers), 11 axial tantalums are expensive, 14 ECN's, Q206 dual transistor HP 1854-0221 a bit expensive and rare too. Lots of work and then the 1kHz limitation might be annoying.

author: AlienRelics
author_rank: Unknown
timestamp: March 13, 2022, 04:53:54 am
content: It seems to me the 1 kHz operating frequency sets the lower limit of capacitance rather high. 159uF is 1 ohm at 1 kHz.

author: strawberry
author_rank: Super Contributor
timestamp: March 13, 2022, 10:17:57 am
content: Quote from: floobydust on March 12, 2022, 11:24:05 pmfound modern replacements for reasonable priceyes it seems more expensive than 5transistor esr meterQuote from: AlienRelics on March 13, 2022, 04:53:54 amphase detector might compensate both lead and lag angles

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: March 13, 2022, 04:39:47 pm
content: Hi,At 1kHz the HP4328A works well.Here I am measuring a 100uF 50V KY series capacitor from United Chemi-con.Measured on an HP4274A:and on the HP 4328A:There is good agreement between the two instruments. Both measurements were made at 1kHz.Jay_Diddy_B

author: gnif
author_rank: Unknown
timestamp: March 14, 2022, 02:06:32 am
content: Quote from: m3vuv on March 12, 2022, 09:39:14 pmDon't worry, we have plenty of it

author: m3vuv
author_rank: Super Contributor
timestamp: March 14, 2022, 06:00:37 am
content: looks like a major hard project,verging on the near impossible to finish due to eol parts etc,hats off too you if you pull it off.

author: strawberry
author_rank: Super Contributor
timestamp: March 26, 2022, 02:52:43 pm
content: circuit modification for better temp stabilityprobably 2% is lost in these parts: CR207, CR208, Q209, Q201, Q202