SI 1260 : pb with sweep fmin 1Hz

Labview program for sweep measurement works with fmin>=1Hz but refuses to "read single" (time out) when fmin is put inferior to 1Hz. Why ? What is the blocking parameter using Read Multiple ?

laetitia,
This is a very confusing post and I am not sure what your real question is. Are you using an instrument driver for a GPIB instrument? If so, which one? What version of LabVIEW are you using?
Please post a more clarified question so that we can respond. Thank you.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask

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Solved!
Go to Solution.
Attachments:
Untitled.png ‏78 KB
Add_1.vi ‏66 KB

Hi Nabilah,
Thank you again fro the the help. However, I have done what you have mentioned but i noticed in the FFT graph that estimate the frequency does not give me the right values. I have tested the code by generating the signal from AI12 and connected that signal to the AO0 to evaluate the code as can be shown in the attached file.the result what I expected from the code is to have the same amplitude at each frequency where I have connected the signal that generated from Ao0 to Ai12(channel). For example, if i run the code with sweeping frequency from 50 Hz to 500 Hz and amplitude 1 V, the result in FFT has to be at each frequency has the 0.7 amplitude (RMS).
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Attachments:
photo.JPG ‏2350 KB
Synchronized AI and AO FRF.vi ‏43 KB

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Hi,
1) differecne between double band and single band antenna
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Barp - Control and Simulation Group - LabVIEW R&D - National Instruments
Attachments:
SimEx Chirp with Delay.vi ‏241 KB

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Ok, so I have an Agilent N1912A power meter with N1921A power sensors on Ch A & B. I have RF power (from signal generator/ amplifier) going into input of a coupler, then Ch A connected to the coupling and Ch B connected to the coupler output. I am trying to measure the loss of the coupling (nominally 20 dB) by just taking the difference in power readings (Ch B- Ch A). I have a VI to read the power from both channels as a signal generator sweeps through different power levels. For the most part it works, except the problem is I am a getting strange "kink" in power reading whenever the power sensor reading is around -10 dBm...see first image attached. Because of this, i get over 0.5 dB change in the coupling loss i am trying to measure, which is unacceptable.
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Attachments:
power sweep with kink.jpg ‏88 KB
coupling loss.jpg ‏39 KB

neets wrote:
Ok, so I have an Agilent N1912A power meter with N1921A power sensors on Ch A & B. I have RF power (from signal generator/ amplifier) going into input of a coupler, then Ch A connected to the coupling and Ch B connected to the coupler output. I am trying to measure the loss of the coupling (nominally 20 dB) by just taking the difference in power readings (Ch B- Ch A). I have a VI to read the power from both channels as a signal generator sweeps through different power levels. For the most part it works, except the problem is I am a getting strange "kink" in power reading whenever the power sensor reading is around -10 dBm...see first image attached. Because of this, i get over 0.5 dB change in the coupling loss i am trying to measure, which is unacceptable.
Now with extensive troubleshooting I have ruled out things like amplifier having unstable gain, or faulty sensors. One interesting thing I have noticed - it tends to improve significantly when i change sweepintervals to be much smaller (e.g. 0.1 dB intervals instead of 0.5 dB), which makes me think it is something I'm not setting properly in my VI when I am reading the power from each channel. If i use 0.1 dB intervals the kink is much smaller..resulting in a more stable measurement of coupling loss. See second image attached.
Anyway, wondering if there are any ideas what could be the source of the issue. As you can see from the images, this always happens at -10 dBm..dont' know what's so special about -10 dBm (where's the shrug emoticon?? ) Anyway, I know can greatly alleviate this problem by always using really small intervals of 0.05 dB or something, but that is just so not practical for my application...(would be too slow). I want to be able to use 0.5 dB intervals and have smooth power readings.
So what are you trying to accomplish here? I would be more interested in a coupler's response over frequency. Usually if you're talking about gain/loss over power, you are measuring the characteristics of an amplifier. (Which I understand you aren't doing, as the DUT is the coupler.)
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

SI 1260 : pb with sweep fmin 1Hz

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