Author Topic: Differences Among Keithley 610 Models  (Read 253 times)

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Offline adamredwine

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Differences Among Keithley 610 Models
« on: June 20, 2019, 10:16:14 pm »
I am relatively new to electrical test equipment but I am starting a PhD in experimental physics and need to learn fast.  My advisor says he knows that the Keithley 610C electrometer will work for our needs but he sees a model 610B for sale for a good price.  He has asked me to determine if the model B would work for our needs.

Now, I don't know the exact specifications we will need but I believe we will only need to use it as an ammeter for very low currents (around 10^-13 Amps).  I have obtained specification sheets for these models but they look functionally identical with the exception of one listing offset current and the other listing grid current.

Are there any big difference between these models that I should be aware of?  Generally, what differentiates the model (other than the 'R' designation for rack form factor)?
 

Offline Kosmic

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Re: Differences Among Keithley 610 Models
« Reply #1 on: June 21, 2019, 01:33:43 am »
My understanding is that the a, b and c models are revision. So they offer the same overall features but precision and accuracy was improved over time.


Personally I would try to get the later revision (610C).
 

Offline MadTux

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Re: Differences Among Keithley 610 Models
« Reply #2 on: June 21, 2019, 07:01:41 am »
As I remember, the older A/B models used vacuum tube input amplifier, while C model uses FETs with isolated gate and super low gate leakage. Don't really know, which are better, vacuum tubes probably are more tolerant to abuse, while with the FET version, there are no vacuum tube related troubles.

Keithley 602 is different, in that it's battery powered. So add the price of like 10 9V batteries to your instrument and be prepared for leaked battery mess, when opening it.
« Last Edit: June 21, 2019, 07:03:18 am by MadTux »
 

Offline Kosmic

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Offline HighVoltage

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Re: Differences Among Keithley 610 Models
« Reply #4 on: July 19, 2019, 03:11:32 am »
I had plenty of problems with "B" version and then I got a "C" version a few years ago and it has been working perfectly since I have it.  I highly recommend the 610C.
It looks like Keithley improved the over the years.
And they are really affordable these days.


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