Electronics > Metrology

Mini Metrology Lab Build (update)

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Jebnor:
I decided to build Mr. Hoffman's Mini Metrology Lab [1] as per the article.  Except for two things: I'm using a MAX6350CPA+ [2] instead of the LT1027BCH in the voltage reference and using the homebuilt rail splittler on pg 78.

I'm laying out and etching my own boards to fit in my cases, a Hammond 1455J1201 [3] for the Voltage Ref, and 1591DTBU [4] for the Null detector.  I have yet to determine what I'm going to use for the KVdivider.

I attached a picture of my parts that arrived today from Digikey. :)

[1] http://conradhoffman.com/mini_metro_lab.html
[2] http://datasheets.maximintegrated.com/en/ds/MAX6325-MAX6350.pdf
[3] http://www.hammondmfg.com/pdf/1455J1201.pdf
[4] http://www.hammondmfg.com/pdf/1591D.pdf

Jebnor:
I have finished the test build of my Voltage Reference before I build a second one and use the more expensive chips.  I am testing my PCB etching process and the physical fit in the case.

I used a 1N5231B Zener diode as a voltage "Reference" in series with a 499ohm resistor across the 15V rail. Once tested, this Zener gave me 5.19V. Then I selected resistors for R4 and R5 to give me the proper feedback ratio to yield 10.0V. As you can see from the attachments, I didn't do too bad.  I used a LM741 for the test build as it has the same pinout as the LTC1050.

Before I build with 'real' parts I'm going to squeeze the IC's, R4 and R5 together horizontally. Everything else will stay the same.

Enjoy :)

JP16A60:
Hi, Jebnor.

I know that this thread is pretty old, but wondering if you made any further progress.

I'm planning on building the same "Mini Metrology Lab" suite sometime soon, and would welcome any thoughts or tips on this.

JP

Gyro:
Conrad Hoffman is actually a contributor to this forum. If he doesn't notice your post then you might want to PM him to see if he has any new tips.

Andreas:

--- Quote from: JP16A60 on August 13, 2016, 08:03:42 pm ---
I'm planning on building the same "Mini Metrology Lab" suite sometime soon, and would welcome any thoughts or tips on this.


--- End quote ---

Hello,

if you want to have a 10V output I would use a AD587UQ (CERDIP-package) as reference.
Any additional resistor divider adds unnecessary temperature errors.

If you have high demands you could use a temperature compensation like on the Geller SVR-T references.

With best regards

Andreas

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