Products > Test Equipment
Some old school instruments showing how it's done (HP 3325A and Fluke 8506a)
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joeqsmith:

--- Quote from: SilverSolder on January 31, 2021, 04:16:35 am ---Just for fun, here is some price information for these units, and the options!  Don't forget to multiply prices by 1.79 to adjust for inflation until today!

--- End quote ---

My first Fluke meter was only $299 in 1974.  It's on par with the free meters from Harbor Freight.   

https://youtu.be/ObKomuLLqU8?t=220
SilverSolder:

--- Quote from: joeqsmith on January 31, 2021, 05:20:06 am ---
--- Quote from: garrettm on January 31, 2021, 03:34:33 am ---
--- Quote from: joeqsmith on January 31, 2021, 02:52:03 am ---I would like to see the signal conditioner inside of yours.   Guessing it's a fair bit different than the one shown on the XDEV site.  I only opened the ADC and ohms clam shells.   

Which interface is your meter using?   I use LabView.

--- End quote ---

Looking back at the photos of your unit, someone has replaced your DC Signal Conditioner with a newer module. The older modules used two metal stickers while later units switched to a single plastic sticker and molding the warning text into the lid. What number does your module show on the label (I can't see it in the photo)?

I have the standard IEEE488 interface on mine and a GPIB to USB adapter floating around somewhere that I need to find...

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881722 with a blue dot next to it.   You may also notice that many of the guides have been replaced as well.  There are at least three different colored rails used.   Guessing it was maintained by Fluke and the upgraded plugin was part of their service.

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I think the blue dot is just a sticker used by the technician to indicate something about the module.   By complete coincidence, I have a sheet of exactly the same kind of little colored circles, and you will see those on my modules too, when I get around to taking some photos!

SilverSolder:

--- Quote from: joeqsmith on January 31, 2021, 05:27:17 am ---
--- Quote from: SilverSolder on January 31, 2021, 04:16:35 am ---Just for fun, here is some price information for these units, and the options!  Don't forget to multiply prices by 1.79 to adjust for inflation until today!

--- End quote ---

My first Fluke meter was only $299 in 1974.  It's on par with the free meters from Harbor Freight.   

https://youtu.be/ObKomuLLqU8?t=220

--- End quote ---

Progress!  :D
garrettm:

--- Quote from: joeqsmith on January 31, 2021, 05:20:06 am ---881722 with a blue dot next to it.   You may also notice that many of the guides have been replaced as well.  There are at least three different colored rails used.   Guessing it was maintained by Fluke and the upgraded plugin was part of their service.

--- End quote ---

Well, you're in luck! That's the same number as mine, so you have the latest DC signal conditioner that I am aware of.

Here's a picture of my modules if anyone is interested.


dietert1:
I am using one of the USB-GPIB interfaces we made 12 years ago. Send '*' to reset the instrument, wait 3 seconds, then '%' to go remote. Then exercise the DC conditioner relays sending "R2?" and "R3?" several times, each time with a 1 second delay. Then data taking starts by setting range "R2" and a loop with trigger "?" and reading the result. Timeout is set to one second and reading terminates when result is available.
This works very welll until somebody touches the USB cable and the FTDI driver hangs. Error recovery requires pulling the USB cable and enumeration. Sigh.

Regards, Dieter
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