Model 372 Swapping Input Wires

magborg
New Member

Posts: 2

Model 372 Swapping Input Wires Aug 13, 2024 1:06:26 GMT -5

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Post by magborg on Aug 13, 2024 1:06:26 GMT -5

Hello!

I am using a 372 Resistance Bridge + Temperature Controller with a 3726 scanner in a Bluefors cryogenic fridge.

Due to some internal wiring, our +/- pinouts ended up split between channels as follows:

Channel 1 -> I+ and I-
Channel 2 -> V+ and V-

Is there a nice way to tell the lakeshore to take the V side from one channel and the I side from another channel? Or a way to do this with script programming or calling?

I am afraid that doing a solder and wire remapping job to the various pins at room temperature will introduce noise.

Thanks!

Lake Shore Ryan
Lake Shore

Posts: 94

Model 372 Swapping Input Wires Aug 13, 2024 10:42:50 GMT -5 magborg likes this

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Post by Lake Shore Ryan on Aug 13, 2024 10:42:50 GMT -5

Hi there! I'm guessing you're talking about the electrical connections to the scanner? So this connector?

Current leads connected to pins 3 and 15.
Voltage leads connected to pins 7 and 19.

Did you have a rewire your fridge, and now you're having to deal with the impact? Or is this how the fridge was delivered to you? And is this a temporary setup? I'm asking because we don't have an easy solution for you inside our box, but maybe we could help with guide you through whatever your backup plan is.

Ryan Oliver
Director of Product Management, Sensors and Instruments
Lake Shore Cryotronics

magborg
New Member

Posts: 2

Model 372 Swapping Input Wires Aug 18, 2024 7:53:04 GMT -5 Lake Shore Ryan likes this

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Post by magborg on Aug 18, 2024 7:53:04 GMT -5

Hello!

Thank you for your reply.

It is due to some PCB design which maps pinouts from our chip to the rest of the fridge. While this could be redesigned, I wanted to see if there was a work around that avoided this.

It sounds like what you are suggesting is that the PCB redesign is the easiest work around, which is what I expected. I just want to see if there was some other option I had not thought of just yet.

Thanks again for the quick reply!! I have a really good idea about what I need to do to fix the circuit, I was just trying to avoid the extra time.