Products > Test Equipment
Keithley 2100,2000, etc or Chinese bench multimeters?
Caliaxy:
--- Quote from: 2N3055 on October 27, 2024, 02:40:20 pm ---
--- Quote from: coromonadalix on October 27, 2024, 10:32:14 am ---
i'm waiting for a Siglent sdm3065 well see .... but the reference voltage used is no par with the oldies with lm399 or the ltz1000 (3458a)
--- End quote ---
Rigol DM3068 and Siglent SDM 3065 also use LM399...
--- End quote ---
But not aged, allegedly (at least not in Siglent SDM3065), which makes them prone to drift in time, requiring more frequent re-calibrations.
Zucca:
--- Quote from: djsb on October 27, 2024, 09:02:10 am ---Are the Keithley multimeters a better investment and can spares still be bought (IE display etc) for them. What is your favourite Keithley model and why? Thanks.
--- End quote ---
A K2001 with schematics and service manual available, it makes automatically on the top on the list.
The most hackable 7.5digit DMM on the planet!
I am almost finished with the restoration of one unit, soon I will be selling it... stay tuned.
2N3055:
--- Quote from: Caliaxy on October 28, 2024, 05:03:28 pm ---
--- Quote from: 2N3055 on October 27, 2024, 02:40:20 pm ---
--- Quote from: coromonadalix on October 27, 2024, 10:32:14 am ---
i'm waiting for a Siglent sdm3065 well see .... but the reference voltage used is no par with the oldies with lm399 or the ltz1000 (3458a)
--- End quote ---
Rigol DM3068 and Siglent SDM 3065 also use LM399...
--- End quote ---
But not aged, allegedly (at least not in Siglent SDM3065), which makes them prone to drift in time, requiring more frequent re-calibrations.
--- End quote ---
What do you mean "more frequent" calibrations?
If reference is aged all you get is less drift on first calibration after a year.
After DMM is a year or two old, they all drift the same from that point on.
Aging is only accelerating initial drift, it does not make device better long term.
If you are aging and sorting you can pick best ones and then it would make the slight difference.
Which is not what happens for entry level 6.5 digit instrument even on big brands. For KS 3458 they will do it. For 34461 not really. Only some pre-aging.
Maybe KS 34465 has aged and selected LM399 because it claims better specs than 34460/61.
zrq:
K2001 (and M) sometimes appear on ebay for a bit less than $800 so it's indeed a great value meter, but the voltage range noise as tested by myself suggests it's rather disappointing for reading the 7th digit (the noise can hardly be averaged down to 0.1ppm of range).
nctnico:
--- Quote from: Caliaxy on October 28, 2024, 05:03:28 pm ---
--- Quote from: 2N3055 on October 27, 2024, 02:40:20 pm ---
--- Quote from: coromonadalix on October 27, 2024, 10:32:14 am ---
i'm waiting for a Siglent sdm3065 well see .... but the reference voltage used is no par with the oldies with lm399 or the ltz1000 (3458a)
--- End quote ---
Rigol DM3068 and Siglent SDM 3065 also use LM399...
--- End quote ---
But not aged, allegedly (at least not in Siglent SDM3065), which makes them prone to drift in time, requiring more frequent re-calibrations.
--- End quote ---
Tony Albus shows that in a review of a GW Instek GDM-9061.
Around 16:00 he compares the GDM-9061 against the Siglent SDM3065 and the Siglent does seem to drift a bit.
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