Products > Test Equipment
Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
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6thimage:

--- Quote from: AndyC_772 on March 05, 2015, 07:05:20 pm ---First impression of the 34465A is that it's more compact than my Keithley 2000, and the display is bright, clear, and has a wide viewing angle. Nice.

--- End quote ---

That sounds exactly like the 34461A.


--- Quote from: AndyC_772 on March 05, 2015, 07:05:20 pm ---Auto-ranging, on the other hand, is so much slower it's not even funny. One of the things I really like about the K2000 is that I can apply a signal, and by the time I've looked up at the meter, it's already found the correct range and showed a measurement. The 34465A is much more like a handheld meter, really quite slow, and that's disappointing. Maybe there's a setting that'll speed it up?

--- End quote ---

Really? I find that the 61A has a very similar auto-ranging speed to the 2000, I can't see why it would take longer on the 65A.

Edit: Autoranging will take longer if you are on the larger apertures (as the measurements take longer). For normal use (probing different signals) there is no need to use the higher apertures (e.g. 100 PLC).


--- Quote from: AndyC_772 on March 05, 2015, 07:05:20 pm ---There's also an annoying relay that clicks away if the meter is left in high-Z voltage mode. As the inputs charge and discharge, the meter switches range and back to accommodate the instantaneous voltage. Maybe I'll just have to leave it in 10M mode instead. It's a shame, but the K2000 doesn't have this quirk either.

--- End quote ---

You shouldn't leave it in the high-z mode - from the help menu (press and hold the high-z soft button), the 10 MOhm is what they expect you to use all the time, with the high-z being there if you need it for a particular purpose (which is rare). But having said that, the charge accumulation (and the relay dumping it when it gets to -12V) will not happen when you are making a reading, it only happens when the inputs are floating. Also, for what its worth, turning off auto-zero decreases the charging time.

Edit: It might be worth resetting your settings to the default (press shift, then the run-stop button).
6thimage:

--- Quote from: LabSpokane on March 05, 2015, 07:31:53 pm ---Any one know if the software update for the '61A will include the ability to log direct to a USB stick?  That is one feature that is surprisingly missing.

--- End quote ---

Unfortunately the 34461A's new firmware will not allow it to log to USB memory or the internal memory - these are the extra features that have been added to the 65/70A. Whether Keysight will release an option in the future that brings the digitising functionality, all be it in a limited way compared to the newer models, is another thing. The firmware is shared between all 4 devices (60/61/65/70A), so it should be possible but whether they will ever do it is another thing.

If we get enough people emailing Keysight's contact centre asking for data logging functionality in the 61A, they might add it at some point as an option.
LaurentR:

--- Quote from: 6thimage on March 05, 2015, 09:16:17 pm ---
--- Quote from: AndyC_772 on March 05, 2015, 07:05:20 pm ---Auto-ranging, on the other hand, is so much slower it's not even funny. One of the things I really like about the K2000 is that I can apply a signal, and by the time I've looked up at the meter, it's already found the correct range and showed a measurement. The 34465A is much more like a handheld meter, really quite slow, and that's disappointing. Maybe there's a setting that'll speed it up?

--- End quote ---

Really? I find that the 61A has a very similar auto-ranging speed to the 2000, I can't see why it would take longer on the 65A.

--- End quote ---

I find this weird to. Which measurement are you autoranging? Even with relay activation, I found the 34461A immensely faster at autoranging than any HH DMM I have. And the 34465A is supposed to be even faster then the 34461A. Per the datasheet, the autoranging time in DCV is <30ms for the 34461A and the autoranging time for all measurements is < 5ms (!) for the 34465A.

Note that the measurement itself may be slow. The reset value for all 3446x series is NPLC10 and autozero ON, so by default you get a measurement time of 0.33/0.4 sec, and that's noticeable (it certainly dwarfs the autoranging time). You can put the 34465A in NPLC 1 or .2 or .02, still get near-full accuracy and blindingly fast readings.
6thimage:

--- Quote from: LaurentR on March 05, 2015, 09:48:10 pm ---
--- Quote from: 6thimage on March 05, 2015, 09:16:17 pm ---
--- Quote from: AndyC_772 on March 05, 2015, 07:05:20 pm ---Auto-ranging, on the other hand, is so much slower it's not even funny. One of the things I really like about the K2000 is that I can apply a signal, and by the time I've looked up at the meter, it's already found the correct range and showed a measurement. The 34465A is much more like a handheld meter, really quite slow, and that's disappointing. Maybe there's a setting that'll speed it up?

--- End quote ---

Really? I find that the 61A has a very similar auto-ranging speed to the 2000, I can't see why it would take longer on the 65A.

--- End quote ---

I find this weird to. Which measurement are you autoranging? Even with relay activation, I found the 34461A immensely faster at autoranging than any HH DMM I have. And the 34465A is supposed to be even faster then the 34461A. Per the datasheet, the autoranging time in DCV is <30ms for the 34461A and the autoranging time for all measurements is < 5ms (!) for the 34465A.

Note that the measurement itself may be slow. The reset value for all 3446x series is NPLC10 and autozero ON, so by default you get a measurement time of 0.33/0.4 sec, and that's noticeable (it certainly dwarfs the autoranging time). You can put the 34465A in NPLC 1 or .2 or .02, still get near-full accuracy and blindingly fast readings.

--- End quote ---

I think you have hit the nail on head there. If you have it in 100 PLC it will take considerably longer to autorange. By the sounds of it AndyC has been playing a lot with the settings, so it might be best to do a reset to the defaults (press shift then the run-stop button).
AndyC_772:
Guys... long day at work followed by the arrival of a new toy. Of course I've been playing!
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