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Second DMM ?

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luudee:

Gentleman,


both, JoeRoy and Hexley, many many thanks for your replies !

I must admit, despite being 30+ years in the industry, I am mostly in front of the computer than in a lab. ;)

I will research your detailed replies in the next few days, and probably will have more questions, lol

Again, many many thanks !!!

Kind Regards,
luudee

HKJ:

--- Quote from: luudee on September 24, 2023, 02:56:03 pm ---I read that the 6500 uses 16 bit resolution, and the 7500 uses 18 bit resolution. Wouldn't that
give the 7500 *continues* better performance if it is calibrated annually ?

--- End quote ---

That is the fast digitizer, not the regular measurement, that have more bits.

aduinstat:

--- Quote from: JoeRoy on September 24, 2023, 02:39:41 pm ---


Siglent SDM3065x and Keithley DMM6500 have a Scan card option, I do recommend it, you can find DIY projects for an interface.



--- End quote ---

The Keithley has two scan card options: a 10 channel card, and a 9 channel card w/ temp sensor (for thermocouples). If you want a card, I recommend the thermocouple card. If you really need more than 9 channels, DIY a 20 channel card with solid state relays.

Kleinstein:

--- Quote from: JoeRoy on September 24, 2023, 02:39:41 pm ---AFAIK, most 6.5 and 7.5 digits DMMs share the same Voltage Reference, then, after 1-2 years they will have basically the same accuracy, although the 7.5 can give you an extra decimal (useful to perceive small variations).

Siglent SDM3065x and Keithley DMM6500 have a Scan card option, I do recommend it, you can find DIY projects for an interface.

--- End quote ---

The LM399 ref. found in most 6 digit meters is not really good enough for a 7.5. digit meter. It is still found in a few Keithley meters togehter with an extra zener. The DMM7510 uses a much better LTFLU reference.

For the SDM3065 the scanner is not an option to add later, it has to be ordered with a scanner as there are also extra parts on the main PCB needed. So one can consider the version with scanner as a different, though separate meter.

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