PCGU1000 2MHz - 25MHz Sweeping

Instruments PC Generators
1

Hello there,

we are developing a project using PCGU1000 in our own hardware for medical purposes, using Delphi 2009. Everything is working fine so far.

But I’m facing problems using the Sweeping function over 2MHz.

[code]
// Interface declaration, taken from the Delphi programming example provided by Velleman
// Single has a range from 1,5 x 10^-45 to 3,4 x 10^38, 4 bytes
procedure SetSweep(freq1, freq2, ampl, offset, time: Single; form: Longint); stdcall; external ‘FGULink.dll’;

PCGU1000_DLL.LogSweep(FSweepingMethod = smLog); // Lin sweep, so this is FALSE
PCGU1000_DLL.SetSweep(
FStartFrequency, // 2100000 = 2,1 MHz
FEndFrequency, // 2100000 = 2,1 MHz
FAmplitude, // 5V
FOffset, // 0 V
FDuration / 1000, // 3000ms = 3s
Byte(FWaveForm) + 1 // 1 = Sine
);[/code]

No matter what I set, everything above 2.000.000 Hz produces a “Invalid floating point operation” error. Everything below (or equal to) 2.000.000 Hz works … :neutral_face:

Any suggestions?

Thanks.

2

Now the FGULink.DLL supports sweep up to 25MHz.
Here is the link to download the updated files and a test program: box.net/shared/34udqbfpj5

The modified files are FGULINK.DLL and FGU.EXE.

Now there is also no need to run your application “As Administrator” in Windows Vista and Windows 7.

3

Awesome. Thanks alot for the light-speed like help. Works now. :open_mouth: :astonished: :wink:

4

How can you sweep to 25 MHz? I thought the PCGU1000 only creates waves to 2 MHz?

5

In sweep mode it is possible.
Select MORE FUNCT. and then click Sweep button.
Enter the Stop frequency 25000000 Hz.

6

Thanks for the quick reply and explanation!

7

Please see also this thread for some more info about the sampling and waveforms: viewtopic.php?f=11&t=3267