Products > Test Equipment
Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
fonograph:
--- Quote from: maxwell3e10 on November 01, 2017, 03:04:27 pm ---I am curious why warm-up and start-up time are important in your application? Or is it just a measure of general temperature sensitivity?
--- End quote ---
Becose I like to turn off my multimeter completly when I am done using it.Its big deal if I have to wait half hour every time I turn it on,especialy when 7510 exist that gets ready in 60 seconds.
Its not so much important,its more like I want to know the truth about how these instruments act,how they work,what to expect.Imagine that I have multimeter that warms up in 1 minute but I dont use it till 30 minutes after start becose I expect it to be still warming up,thats bad becose it waste time and electricity,or imagine I start using multimeter 1 minute after start and get bad readings becose I am not aware its warming up long time,knowing exact warm up behavior of the multimeter is is in my opinion good thing to know.
nctnico:
It is not just the reference but the rest of the equipment needs to warm up as well. If you want to do really accurate measurements you'll need to wait until the test leads reach thermal equilibrium too. From what I have seen most test equipment needs about 30 minutes warm up time to meet the accuracy specs.
Someone:
--- Quote from: fonograph on November 01, 2017, 04:58:59 pm ---
--- Quote from: maxwell3e10 on November 01, 2017, 03:04:27 pm ---I am curious why warm-up and start-up time are important in your application? Or is it just a measure of general temperature sensitivity?
--- End quote ---
Becose I like to turn off my multimeter completly when I am done using it.Its big deal if I have to wait half hour every time I turn it on,especialy when 7510 exist that gets ready in 60 seconds.
Its not so much important,its more like I want to know the truth about how these instruments act,how they work,what to expect.Imagine that I have multimeter that warms up in 1 minute but I dont use it till 30 minutes after start becose I expect it to be still warming up,thats bad becose it waste time and electricity,or imagine I start using multimeter 1 minute after start and get bad readings becose I am not aware its warming up long time,knowing exact warm up behavior of the multimeter is is in my opinion good thing to know.
--- End quote ---
What absolute measurements are you making of that accuracy? Most devices under test themselves will need time to thermally soak before they are stable enough to have the meter dominate the error.
HighVoltage:
--- Quote from: HighVoltage on October 29, 2017, 04:25:33 pm ---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.
--- End quote ---
OK, now I have a new Keysight 34465A, (made and calibrated in 2016).
And here I did a fresh comparison of the warmup-time for three instruments.
Interestingly the 34465A needs about the same time as the 34470A but the graph looks a little different.
It seems that 30 min warmup is not enough for the Keysight instruments and they really need one hour to stabilize completely. And the Keithley 7510 is almost stable after only 3 min.
Here are the graphs from today.
0xfede:
Hi all folks.
In the past weeks I had to take a ton of measurement from my 34465A and I needed a fast and convenient method to store both screenshots and csv data. So I wrote a small C# program that use socket for connectivity (completely driverless) that I like to share.
It should work with both 34465A and 34470A, I tested it on WIN 7 64bit and it downloads 2Mpts in just 35 seconds. As a bonus I've added a few graph tweaking tools like deleting points and adding calibration factors for use with shunts and other stuff.
Please let me know if I have to change something.
Best,
0xfede
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