Would need to digitize a pulse voltage.
What is teh proper GPIB sequence to setup and read the digitize signal ?
From the 3446xA, 3447xA User's Guide:
Digitize ModeThe digitize mode applies only to the 34465A/70A with the DIG option, and as is available only from theDMM's front panel. The digitized mode provides a front–panel user interface that allows you to quickly setup digitized measurements. < That's really not true as there are SCPI commands for doing the digitize setup.
This being said, you can still program the 35565A to max relatively fast measurements with the following SCPI command sequence. You can use the Keysight Command Expert application for this
SAMP:COUN 1000 (up to 10,000 max)
TRIG:SOUR EXT;SLOP NEG
From the SCPI command reference section of the User's Guide under the SENS:VOLT:APER command:
(Without the DIG option) 200 µs to 1 s (2 µs resolution), default: 100 ms. (With the DIG option) 20 µs to 1 s (2 µs resolution), default: 100 ms.
I am using the 34465A with DIG-option.
Question is: Why does the above setup with:
aperture = 20E-6 (=max speed) and
take ~5.5 seconds?
The DIG-option says sample time is 50.000 samples/sec so 30.000 samples should take only 0.6sec.
Or is this speed only possible when using the Digitize-function at frontpanel?
The programming overhead time must also be considered. You have to program a large number of samples to swamp that out. Regardless, it you have programmed it as follows to sample at 50 Krdgs/sec, it will be sampling that fast. With the following, I get 50,000 rdgs to memory in 1.06 seconds.
Execute those setup commands and wait for that to complete. The measure the time for the following to complete.
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when running your commands then the INIT;*OPC? takes ~9secs
If i change TRIG:COUN 50000 to SAMP:COUN 50000 then it only takes ~2secs
Thanks for your help
I’m sorry. I didn’t even send you the SCPI command sequence I used to get the 50K samples per second. See below, You also need to wait for the setup commands to complete before sending the INIT? That the reason for the OPC?, operation complete query command. From then on you keep sending the INIT;OPC? as often as you want and get the same speed. With this I measured between 46.8K and 49.75K rdgs/sec with a VEE program. You do need the extended memory to see more than 50,000 and with a few hundred thousand the time measurement would swamp out the programming overhead giving you a better time measurement.
CONF:VOLT:DC 1 < fixed range
*OPC? and wait for the result
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