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Thread: 53230A continuous, gap free frequency measurement


Permlink Replies: 6 - Pages: 1 - Last Post: Sep 5, 2013 8:07 AM Last Post By: Zutje
imrehg

Posts: 1
Registered: 07/01/11
53230A continuous, gap free frequency measurement
Posted: Jul 1, 2011 5:07 AM
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Hi,

I can't seem to figure out configure the 53230A for gap-free, continuous, ongoing measurement. Either I have to use "READ?" in a loop, which has a ~300ms gap, or have to specify a sample number (which is finite). Is there a command for setting the counter for infinite measurement (with a given gating time) and use R? or DATA:REM? to get transfer the values to the computer?
funkytuqe

Posts: 13
Registered: 11/21/11
Re: 53230A continuous, gap free frequency measurement
Posted: Jun 12, 2012 3:51 PM   in response to: imrehg in response to: imrehg
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I am trying to accomplish the same thing. I have set up math functions through the CALCulate commands but would then like the counter to run continously to accumilate statistics for a period of time, then stop and read the stats throug the ALL query. I have set up a sequence in command expert for now but still have not achived contiuous measurement.

Any advice?
lhornburg

Posts: 476
Registered: 01/15/10
Re: 53230A continuous, gap free frequency measurement
Posted: Jun 14, 2012 2:00 PM   in response to: imrehg in response to: imrehg
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Have you been using the SENSe:FREQuency:MODE CONTinuous command?

If you use the DATA:REMOVE? or R? command in conjunction with the continous command above, the instrument will continue to take readings as you remove your data.

You can use the DATA:POINTS? command to see how many data points are in memory.

If you want to stop measurements you can use the ABORT command.

Does that answer some of your questions?

funkytuqe

Posts: 13
Registered: 11/21/11
Re: 53230A continuous, gap free frequency measurement
Posted: Jun 27, 2012 2:06 PM   in response to: lhornburg in response to: lhornburg
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Ok, thanks that should help.
jit

Posts: 1
Registered: 03/26/13
Re: 53230A continuous, gap free frequency measurement
Posted: Mar 26, 2013 12:45 PM   in response to: imrehg in response to: imrehg
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I'm looking to do the same thing with my new 53230A: make continuous time-gated frequency measurements indefinitely and read the data off the unit periodically to avoid memory overflows. I've tried using the SENS:FREQ:MODE CONT command followed by an INIT:IMM but it seems to just return one measurement and then stop. What am I missing? Anyone have a working program I can crib?
orko

Posts: 6
Registered: 05/08/13
Re: 53230A continuous, gap free frequency measurement
Posted: May 8, 2013 9:30 AM   in response to: imrehg in response to: imrehg
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Is an example available? A block diagram is worth a million words ;-)
Zutje

Posts: 1
Registered: 09/05/13
Re: 53230A continuous, gap free frequency measurement
Posted: Sep 5, 2013 8:07 AM   in response to: orko in response to: orko
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I noticed an unexpected interuption of the measurement after about 1 second. Turning of the system timeout worked for me:

SYSTEM:TIMEOUT INF #or a sensible value
CONFIGURE:FREQUENCY
TRIGGER:COUNT 1
SAMPLE:COUNT 100 # the number of measurements to take
SENSE:FREQUENCY:MODE CONT #or RCON (not documented, for continuous measurements in reciprocal mode, firmware >1.10)
SENSE:FREQUENCY:GATE:TIME 1.0 #or another desired gate time
INIT:IMMEDIATE
R? #repeat until all measurements are read

The difference between CONT and RCON is that CONT measures in resolution enhanced mode (Lambda-averaging), and gives you a modified allan deviation (MDEV) statistic for the selected gate time, while RCON is measuring in reciprocal mode (Pi-averaging) and gives a normal allan deviation (ADEV).

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