Author Topic: Keithley 2000 TF-245 version / year question  (Read 2136 times)

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Offline OverspeedTopic starter

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Re: Keithley 2000 TF-245 version / year question
« Reply #25 on: May 15, 2024, 02:50:19 pm »
Hello

Update , this Harwin connector ( header ) can be soldered in place of the 245 component

Regards
OS
 

Offline Kleinstein

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Re: Keithley 2000 TF-245 version / year question
« Reply #26 on: May 15, 2024, 03:49:59 pm »
With the resistor values I don't know if one needs rather accurate ratios at some places. It depends on the software inside the meter, if the use some kind of norminal values for the slow ration or do an extra measurement (e.g. special factory calibration or in between normal measurements). Ideally one wants an option to trim 2 of the resistors, to adjust the ratio of the positive , negetive and small slope.
 

Offline OverspeedTopic starter

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Re: Keithley 2000 TF-245 version / year question
« Reply #27 on: May 18, 2024, 04:32:16 pm »
With the resistor values I don't know if one needs rather accurate ratios at some places. It depends on the software inside the meter, if the use some kind of norminal values for the slow ration or do an extra measurement (e.g. special factory calibration or in between normal measurements). Ideally one wants an option to trim 2 of the resistors, to adjust the ratio of the positive , negetive and small slope.

Hello

I have draw two PCB base on 0603 resistor ( 1K and 10 K in serie for most of them ) and header i Have checked the stack height I continue to work on the header connector BOM

I can sort / measure the 0603 on my Kelvin 4 wires test jig

I link some screen prints

As I have some room on the PCB I can add additional 0603 for trimming , my first goal is to test a solution asap , after I can re design PCB with resistor net if necessary , 0603 are easily available from Mouser

Regards
OS
« Last Edit: May 19, 2024, 10:35:41 am by Overspeed »
 
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Offline OverspeedTopic starter

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Re: Keithley 2000 TF-245 version / year question
« Reply #28 on: May 22, 2024, 07:28:52 pm »
Hello

a question for Kleinstein

On Xdev website there is a table value of the 245 resistances

27.5 K looks to be closer than 27.4 than 27.5

Note : thanks to Xdev for his amazing work

Regards
OS
 


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