benndorf

OK. I understand. This will help! Thank you!

This is part of the Logging file. It contains the correct counts. But the Time scale is not changing. I need qa logging of both: Counts versus time. How cab I obtain this? The 2D display during measuring depicts correctly counts versus time.

I am using a Labjack U12, measuring frequencies from a homebuild QCM (quartz crystal microbalance) pruducing TTL rectangular signals 0 -5 V. I used the „BasicCounter.ctl“ with modification for my problem. I included in the page 0 a 2D graph, demonstrating the number of raw counts vs. time, which is working perfectly. With the logging into csv files I get the raw counts correctly, but not the time scale, which should change from seconds to seconds. What could I do to get with the logging a correct time scale? I include my modified „BasicCounter new.ctl“ and a screenshot from page 0 I appreciate very much your comments. Kind regards Carsten BasicCounter new.ctl

I am using for a long time two DAQ Labjach U12. I was allways happy with the DAQFactory Express. But I had to install a new computer and downloaded recently DAQFactory Trial. It does not convert after the 25 days of the trial period into the free express version. When I start the DAQFactory software, a message appears saying that the trial period is over. Indicating two different ways to enter an unlock key. What is wrong? How can I get again the free version of DAQfactory express? Saludos Carsten, from Lima, Peru

Dear DAQFactory forum, Dear Mr. Guru, concerning the nested loops I am looking forward for your advice. Here is the script, which I tried to use: // Spectrometer Control private low=2 private high =5 private step = 0.01 private t = 0.5 Output0= low Output1=0 //output0 is the coarse voltage setting (0, 1, ....4) //output1 is the ramp which increases in steps of 100 mV (finally 5 mV) while(Output0 < high) while(Output1<1) Output1 = Output1 + step read(Input) delay(t) endwhile Output0=Output0 +1 endwhile[/CODE] When I start this script, the ramp with "Output1" increases from 0 to 1 in the step width 0.01. When it reaches 1 I find that "Output0" is set from 2 to 3. But then the program stops. What I want is that the "Output1" starts again (from 0 to 1 in steps 0.01) and then the "Output0" is going to 4 and finally stops when the "Output1" ramp has finished. What is wrong with my script? Saludos cordiales Carsten

I use a ramp of 0 -5 V of my LabJack U12 to control a spectrometer. For survey spectra the 10 bit resolution (5mV steps) is sufficient. For detailed analysis, however, I needed to increase the resolution to 12 bit (1 mV steps). This I achived using simultaneously both D-A outputs of the U12 and a differential opamp amplifier used as a "summer". The first outputs from the U12 was used in fixed steps of 0, 1, 2, ... 4 V. And added to this (by the "summer") a ramp with steps of 5mV, which were divided by 5 by the "summer" in order to achieve the desired steps of 1 mV. This gives for the whole range of 0 - 5 V a resulution of 1mV. It works! I attached a fig. of the simple circuit for the "summer" with the differential amplifier (I used a LF 356); total cost of the parts about 10 -15 US$. Power supply (+12V, -12V) were obtained from the PC AT power supply. For me, there is still an open problem in the programming, which I have not yet solved. ?Is it possible to use in the DAQFactory script nestled loops of the following form: while ...//steps of 0, 1, 2,...4 while ....//steps of 0.005 up to 1 ..... ..... endwhile endwhile I tried to write a script in this way. But it did not do what I exspected. The ramp stoped after the first run of the nestled loop. Is there another way of programming? I am allways very pleased with the help from this forum. Carsten Benndorf, from Lima, Peru

I want to use a ramped output (0-5V ) devided in 5mV steps to control my AES spectrometer and read at the same time an input signal.To start with, I used the RampSample.ctl and made my own modifications. See, for example, my post from January 29, 2013. The ramp should start with a certain volt. In the script (Sequemces) I used for example "private Low = 2" The ramp should end also with a certain voltage. In the script "private high = 4" Also I included in the script a "private step = 0.005" and a "private t=1.0" for the delay. I want to control these values from "pages", where I also can start the ramp (my measuerment). How can this be done? Again, I am very glad about this forum and the help I have received recently. Carsten, from Lima, Peru SpectrometerControl.ctl

Again, thank you very much for your help. I solved the problem. But... I wrote a new script, also based on the LJGuideSamples and made my own modifications. Now it works fine. But I really dont know, what was wrong with my first scipt. Anywhow, I am now quite satisfied. Best ragards Carsten

Dear Mr. Guru, thank you very much for your prompt reply. Yes, by retyping I made the two errors you mentioned. I changed the timing for " MyChannel" to timing = 0.00 Instead of err= and addvalues I used read(). However, after the output ramp has finished, the input channel "MyChannel" is still reading data. What the hell I am doing wrong? Again, thank you for your help. Carsten

I am a new user of Labjack U12 and Daqfactory Express. For my measurement I need I ramped output, 0 to 5 Volts in steps of 0.05 V with a deleay (channel AO0, "Output"). For each steps I want to measure an input voltage (channel AI0, "MyChannel"). I used a script from the LJGuideSamples/RampsSample.ctl and made my own modification: using("device.labjack") include(c:\daqfactory\labjackud.h") private err private val Output=o while(Output<5) Output = Output +0.05 err=eGet(0,LJ_ioGet_AIN,0,@val,0) MyChannel-AddValue(val) endwhile When I startet the sequence, it works fine, but... I get the ramp, I can see the incoming values from "MyChannel". But when the ramp is finished, "MyChannel" is still reading data. What I need is the following: Each time the sequence set a new step in the ramp, I want to read a value from "MyChannel". If the ramp has finished, I want also to finish the reading of "My Channel". How can this be done? I am looking forward for usefull help. Carsten, from Lima, Peru