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Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters

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6thimage:

--- Quote from: radioFlash on March 10, 2015, 11:12:27 am ---Here's a photo of with the shield in place. This is the only shield in the meter-there's not a separate one for the fan/regulator.

--- End quote ---

That's not what I was expecting. The metal shield is part number 5041-5231 and is used on all four meters (34460/61/65/70A), but the Keysight part website mentions a fan shield (5041-5261) that is used on the 65/70A. I thought that this fan shield might be made from plastic to direct the airflow away from the voltage reference, but if it isn't fitted it makes me wonder why they list it as a part.

6thimage:

--- Quote from: AndyC_772 on March 10, 2015, 03:10:48 pm ---Here's a 10 sample log. Probes are connected to a 9V battery. Meter is set to the 10V range, acquisition time is set to 200us, and sample interval is set to 2ms, both of which are as short as I can get. If anyone knows how to sample at 1ms intervals, I'd be interested to know what I've missed.


--- Code: ---Start date:,03/10/2015,Start time:,15:09:42.910
Sample interval:,0.002000
Reading #,Reading
1,+8.80413134E+00
2,+8.80414814E+00
3,+8.80423098E+00
4,+8.80415278E+00
5,+8.80414582E+00
6,+8.80419101E+00
7,+8.80415741E+00
8,+8.80417653E+00
9,+8.80417885E+00
10,+8.80416958E+00

--- End code ---

--- End quote ---

8 decimal places - this is the same as the CSV output from the 34460/61A. I'm not sure why you can't get 1 ms sample intervals - I can't find a reference to it in the manual.

6thimage:

--- Quote from: AndyC_772 on March 10, 2015, 03:10:48 pm ---Here's a 10 sample log. Probes are connected to a 9V battery. Meter is set to the 10V range, acquisition time is set to 200us, and sample interval is set to 2ms, both of which are as short as I can get. If anyone knows how to sample at 1ms intervals, I'd be interested to know what I've missed.

--- End quote ---

I have just been informed that you need to change your settings a little to get to 1 ms intervals. If you having auto-ranging enabled, the minimum sample interval is increased so the meter can autorange and perform a measurement without over-running into the next sample period. Additionally, the auto-zeroing increases the time required for the measurement as well.

So to get a 1 ms sample interval either change to a fixed range, disable auto-zeroing or change to a smaller aperture.

AndyC_772:
Auto zero doesn't seem to make any difference, but manual range selection does. Set the meter to 10V manually and I get 1ms intervals.


--- Code: ---Start date:,03/10/2015,Start time:,16:29:47.790
Sample interval:,0.001000
Reading #,Reading
1,+8.80342110E+00
2,+8.80344253E+00
3,+8.80340430E+00
4,+8.80342110E+00
5,+8.80344485E+00
6,+8.80348772E+00
7,+8.80350684E+00
8,+8.80343326E+00
9,+8.80334289E+00
10,+8.80338808E+00

--- End code ---

Sparky:
Did anyone get the Digitize (DIG) option? I would love to hear what maximum sustained sample rate is possible when simultaneously transferring data to a PC with USB and LAN connections.

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