Products > Test Equipment
Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
zzattack:
I've read some references in this thread about keysight moving away from WinCE for these units. Is there any concrete info about this? What would the replacement be?
Kjelt:
Had luck found an affordable 34465A last week, couldn't resist.
Installed the new firmware 3.0 and now have the DIG option enabled.
I an now thinking of the MEM option but can only find that it extends the internal storage to 2M events instead of 50k.
So what is the usecase for this extra storage if I insert a USB stick and log to external storage then this is not needed or what am I missing ?
Second where can you buy this, I saw it on Farnell for $250 but is that the normal way of purchase, not directly at Keysight, any special discounts going on presently that anyone know of ?
Thanks. Great meter, enjoyed playing with it this weekend.
Dr. Frank:
--- Quote from: Kjelt on September 09, 2019, 11:29:06 am ---Had luck found an affordable 34465A last week, couldn't resist.
Installed the new firmware 3.0 and now have the DIG option enabled.
I an now thinking of the MEM option but can only find that it extends the internal storage to 2M events instead of 50k.
So what is the usecase for this extra storage if I insert a USB stick and log to external storage then this is not needed or what am I missing ?
Second where can you buy this, I saw it on Farnell for $250 but is that the normal way of purchase, not directly at Keysight, any special discounts going on presently that anyone know of ?
Thanks. Great meter, enjoyed playing with it this weekend.
--- End quote ---
As soon as you really use (need) digitizing @50kHz, for longer intervals than 1sec, you'll also need the MEM option.
The instrument does not support fast data transfer to USB, or USB memory.. I didn't find the exact numbers of these speed limitations, right now.
This is mainly caused by the firmware, or the data crunching / transfer, possibly limited by the operating system WIN CE, because, in a similar manner, there's a limit of direct data transfer over the LAN and GPIB, to about 25 kSa/s.
You can observe that, if you are using BenchView trying to digitize at maximum rate and for longer period of time.
The internal buffer of the 34465A is used for that. As soon as the 50kSa, or 2MSa are exceeded, the whole system slows down.
They still have two bugs for digitizing, inside the command set, which prevent that the 344465A / 470A are really compatible with the 34411A (which probably was able to do direct high speed digitizing over its buses), and this also prevented my attempts to program digitizing at full speed.
1) There is no dedicated command to configure for 20µs or 50kHz w/o delay.
2) The smallest data format (50kHz delivers 16Bit only) for fast transfers is 8 Byte, that means bus data transfer rates of at least 400kB/sec, instead of 4 Byte / 200kB/sec, like in the 34411A. (*)
If you search the 344465A/470A for substantial data transfer rates over USB/LAN/GPIB, you'll only find incomplete information.
Anyhow, I have used this digitizing feature quite often in DCI digitizing mode, and was really happy about the 2MSa depth... got it for free, at that time.
Frank
(*) There's a detailed AN for the 410A/411A, "Agilent 34410A/34411A 6 1/2 Digit High-Performance Multimeters", which describes the digitizing state machine, and capabilities.
I'M missing that for the "successor instrument", maybe they simply replaced this state machine by SW, which is too slow.
Mr. Scram:
--- Quote from: zzattack on May 02, 2019, 12:28:30 pm ---I've read some references in this thread about keysight moving away from WinCE for these units. Is there any concrete info about this? What would the replacement be?
--- End quote ---
The four channel 1000X oscilloscope uses Linux where it's two channel brother uses CE. I've heard Linux mentioned in interviews too so that seems to be the most logical candidate.
Kjelt:
@ Dr. Frank, thanks for the explanation. :-+
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