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Square vave signal output

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Square vave signal output

Postby Resires » Wed Oct 02, 2013 1:18 pm

I have the following problem with the logger PICOLOG 1216

I need to generate the output square wave signal with a frequency of about 2 seconds.

I would like to use one of the digital outputs.
The only thing I can find it on continuously 1 or 0 (2.5 V or 0 V) or PWM frequency 1.8 ms. It's definitely not enough. How can I increase the frequency?
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Re: Square vave signal output

Postby Martyn » Mon Oct 07, 2013 3:04 pm

Unfortunately it is not possible to do this.
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Re: Square vave signal output

Postby Resires » Wed Oct 16, 2013 10:55 am

I have two additional questions:

1) I need to make measurement in 30 points. I bought two PicoLogs 1216. Can I run them in one software? At this moment i try run two same programs in different windows, but disadvantage of this solution is time differential between my measurement. (For example i click start measurement in one window, and then in second window measurement is starting one second later).


2) Can I connect PicoLog to LabView or DasyLab?
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Re: Square vave signal output

Postby Martyn » Tue Oct 22, 2013 7:27 am

You can run two Picolog 1216s under the Picolog software but not the Picoscope software. Just tick the appropriate box for multiple devices when creating a new setup.

There is an llb file for LabvIew in the SDK, download this from http://www.picotech.com/software.html
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Re: Square vave signal output

Postby Resires » Tue Oct 29, 2013 2:44 pm

Unfortunately, I don't see on my CD instalation option for two PicoLogs running in the same time.

I have only:

Install PicoScope 6
Install PicoLog
Install PicoScope 9000
Install PicoScope Education
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Re: Square vave signal output

Postby Martyn » Tue Oct 29, 2013 3:14 pm

Install Picolog software. Then when you run one instance of Picolog, and create a new settings file, you can select the "Multiple Devices" option before specifying the devices and what is connected to each channel.
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Re: Square vave signal output

Postby Resires » Wed Oct 30, 2013 8:29 am

I have only those options, which you can see on the picture I have uploaded.

There are no "Multiple devices" option before this screen.

I am choosing "PicoLog 1000 Series" and still have only one device running.
Attachments
instalation.PNG
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Re: Square vave signal output

Postby Martyn » Wed Oct 30, 2013 9:22 am

Not installing but when you run the software and create a settings file
Multiple.gif
Multiple.gif (21.88 KiB) Viewed 3078 times
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Re: Square vave signal output

Postby Resires » Wed Oct 30, 2013 12:30 pm

You are right. Now I can run two PicoLogs at the same time.

1) But there is a trouble with number of channels. I have to measure humidity in 30 points. When I try to export data to "View graph" - maximum is 20.
When I try to export data to "View spreadsheet" - maximum is 16.

So the only way is export data in two smaller groups? I want to export the to excel.

2) Is there any posible way to set 2.5 V on Digital Output when I start recording measurement, and set 0 V when it's not recording? It would be great for information, that the record have ended.

3) I found only this math functions:
( ) - + * / exp log10 ln power mod sqrt

Is there any chance for use (in calbulated parameters):
round()
if()
previous_sample()
?
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Re: Square vave signal output

Postby Martyn » Mon Nov 04, 2013 3:03 pm

1. They are the limits for the spreadsheet and graph views, you can use File->SaveAs to save the data file as a CSV file for import into excel.

2 & 3. Unfortunately it is not possible to set/clear a digital output in response to starting/stopping capture, or add new maths functions. The software is now maintenance only so no enhancements are on the development plan.
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Re: Square vave signal output

Postby Resires » Fri Dec 13, 2013 8:59 am

I have another question about working with two PicoLogs.


I had to connect Grounds of both devices. It's working correct.
But the real question is - can I connect pin named 2.5V of both devices?

I have a sensor, which should be powered sometimes from 1 PicoLog, and sometimes from 2 PicoLog.
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Re: Square vave signal output

Postby Martyn » Thu Dec 19, 2013 1:37 pm

Are both Picologs active all the time ?
Are they connected to the same PC ?

If one unit powered down it would load the 2.5V rail of the other, dragging it down, which would then affect the readings from the sensor.
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Re: Square vave signal output

Postby Resires » Fri Dec 20, 2013 2:21 pm

Both Picologs are active all the time and they are connected to the same PC.

And my (probably) last question:
What could happen if someone will connect pins named 2.5V and GDN? Has PicoLog some kind of fuse? Is it replaceable?
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Re: Square vave signal output

Postby Martyn » Tue Dec 24, 2013 10:57 am

The ground pins are protected by resettable fuses which will automatically reset when the voltage source is
disconnected from the input pin.
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