Products > Test Equipment
Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
HighVoltage:
--- Quote from: fonograph on October 28, 2017, 08:39:08 pm ---In dmm noise thread,High Voltage posted comparsion where both 34470 and keithley 7510 set to 10V DCV range and he is measuring warmed up stable reference.It shows 7510 gets stable in 40 seconds while 34470 needs 20 minutes to reach stability due to warm up.
Can someone do the same tests? I am specificaly curious if 34465 with its lm399 reference warms up faster.
--- End quote ---
Hello Fonograph
Sorry, I dont have a Keysight 34465A (not yet) but I compared here a 34461A (LM399) with a 34470A (LTZ1000). And there is almost no difference in warmup time.
- 34461A, increase of 210 mV during 30 min warmup
- 34470A, increase of 172 mV during 30 min warmup
So, I would suspect the 34465A to be in the same range.
fonograph:
Thank you very much.I looked again and I made mistake,it was maxwell3e10 who posted that 65 vs 7510 graph.I think the 61 is goid enough,its obvious that it isnt the reference.
I dont know what to do,34470 have normaly working autozero and datasheet spec says it have 0.5ppm linearity but it turns on for 20 minutes and its temperature coefficient is double of 7510.
7510 is better in everything except that horrible useless autozero and as result its averaging almost doesnt work at all,also the linearity is 2ppm,thats probably not a issue,but 34465 is 1ppm and cost 1/3.
HighVoltage:
If you don't need the resolution of the 7 1/2 digit 7510 or 34470A, then the 34465A should be perfect for you.
maxwell3e10:
DMM7510 has the potential to be a great meter. Its temperature coefficient is specified at 0.15ppm/degree, a factor of 10 better than for 34470. That is probably the reason it reaches steady state much faster. In my tests for dynamic temperature changes at 1000 sec it was about a factor of 2 better than 34470. That comes out to TC of about 0.4ppm/degree for 7510, worse than spec, although its not exactly the same kind of test. DMM7510 also has much lower noise on 100mV and 1V ranges. The interface is nicer and it has more capabilities.
That is why its so frustrating that the 7510 autozero firmware problem has not been solved. Also the interface is still buggy (my latest success in crashing it involved using temperature secondary measurement). So there is no clear winner.
HighVoltage:
--- Quote from: maxwell3e10 on October 30, 2017, 05:22:23 am ---DMM7510 has the potential to be a great meter. Its temperature coefficient is specified at 0.15ppm/degree, a factor of 10 better than for 34470. That is probably the reason it reaches steady state much faster. In my tests for dynamic temperature changes at 1000 sec it was about a factor of 2 better than 34470. That comes out to TC of about 0.4ppm/degree for 7510, worse than spec, although its not exactly the same kind of test. DMM7510 also has much lower noise on 100mV and 1V ranges. The interface is nicer and it has more capabilities.
That is why its so frustrating that the 7510 autozero firmware problem has not been solved. Also the interface is still buggy (my latest success in crashing it involved using temperature secondary measurement). So there is no clear winner.
--- End quote ---
I totally agree with all your points.
In comparison, I like both meters a lot.
The 7510 is repeatedly more stable than 34470A (in the ppm range) and I am not even using the ACAL feature on the 7510! The ACAL on the 34470A is sometimes flaky and over corrects and then needs few min to correct itself again. But the really amazing feature of the 7510 is the ultra fast warmup time.
Here is a new picture from today below.
After turn on, I cleared the memory after 10 seconds because of the weird saw-tooth graph at the very beginning. And then in 120 seconds after that, the instrument is stable.
Another very important thing to consider is service. (within a warranty or outside of warranty). Try to get any kind of service with Keithley / Tektronix is a horrible experience, to say the least. If it comes to service alone, I would never buy a Keithley / Tektronix instrument again.
If you have any problems with a Keysight instrument, it is being taken care of immediately and so far always to my fullest satisfaction. This summer I had both of my 34470A serviced at the Keysight Böblingen / Germany facility and I was (again) astonished about the really amazing service attention I got.
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