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Hantek HDG2002B AWG: 5Mhz or 100MHz? Let's see!
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Cyber7:
Idpromnut wrote:
--- Quote ---I received today a replacement board for my MSO and have exactly the same results. The amp of a 2V sine decrease above 30Mhz to 340 mV à 100MHz.
So it has to come from the HDG.
With my stock MSO board:
30 000 000.000 000 Mhz -> 1.98 V
30 000 000.000 001 Mhz -> 1.62 V !!!

Software "issue" of v1.00.1?
--- End quote ---

I have the same issue. Not quite the advertised range for the 2102: Amplitude Range ?20MHz:1mVpp—20Vpp; ?60MHz:1mVpp—15Vpp; ?80MHz:1mVpp—10Vpp;?90MHz:1mVpp—5Vpp; ?100MHz:1mVpp—2Vpp

Software: 1.00.2 (140819.0)
Kernel: Linux 3.2.35
FPGA: 12
Keyboard: 3
PCB: 1004
flatlander:

--- Quote from: fremen67 on October 26, 2014, 11:58:54 pm ---

Quote from: flatlander on Yesterday at 05:42:24 PM
Did some testing on my 'upgraded' Hantek HDG2002B and found that the amplitude of the generated signal (sine) quickly drops off past 5MHz. It seems that my unit's firmware is still limiting the bandwidth to 5Mhz even though it lets me increase the frequency to 100Mhz. I tried loading older FPGA firmware but that doesn't work at all (no output and all output related self tests fail). Possibly have to flash a 'matching' set of software and FPGA versions. I'd be interested to know if the amplitude issue also exists on earlier software/hardware versions.

Versions:

Software: 1.00.2 (140926.0)
Kernel: Linux 3.2.35
FPGA: 20
Keyboard: 3
PCB: 1004


--- End quote ---



I have a similar problem but it starts right after 30 Mhz: https://www.eevblog.com/forum/testgear/hantek-hdg2002b-awg-5mhz-or-100mhz-let's-see!/msg475956/#msg475956. It seems that only a few of us have this problem...

Software 1.00.1 (140402.0)
FPGA 11
PCB 1002

--- End quote ---
I temporarily renamed the htg.cal calibration file and rebooted just to see if that would make a difference. Without that file the amplitude didn't start decreasing until past 10Mhz as opposed to 5MHz with the calibration file. Need to look into manual calibration and to see if that makes a difference.

Could someone who's HDG2002B doesn't have this problem upload their htg.cal file. I'd be interested to see if this makes a difference on mine.

EDIT: OK, after a bit more experimenting, calibration seems related to this issue. I used the calibration function of the generator and found that it starts with a DC voltage calibration followed by a AC voltage (sine upto 100MHz) calibration. I stopped about halfway through as it's a very laborious process and only wanted to see if it made a difference (entered many more values than the 12 values reported in this thread without issue though). Looks like the calibration issue may have been fixed in my version of the firmware.

It definitely had an impact as the decreasing amplitude now starts around 25MHz versus the 5MHz earlier. I suspect Hantek started to only calibrate the generators up to 5Mhz.

I would still be keen to try a cal file from a unit that doesn't have the issue (or less severe, the calibration can't be too far off).
Cyber7:
@Fremen67:
--- Quote ---Good job. Could you send me a link to your dump? I am still running firmware 1.00.1 ..
--- End quote ---
I sent you a PM.
fremen67:

--- Quote from: flatlander on October 27, 2014, 04:23:16 am ---OK, after a bit more experimenting, calibration seems related to this issue. I used the calibration function of the generator and found that it starts with a DC voltage calibration followed by a AC voltage (sine upto 100MHz) calibration. I stopped about halfway through as it's a very laborious process and only wanted to see if it made a difference (entered many more values than the 12 values reported in this thread without issue though). Looks like the calibration issue may have been fixed in my version of the firmware.

It definitely had an impact as the decreasing amplitude now starts around 25MHz versus the 5MHz earlier. I suspect Hantek started to only calibrate the generators up to 5Mhz.

I would still be keen to try a cal file from a unit that doesn't have the issue (or less severe, the calibration can't be too far off).

--- End quote ---

That makes sense. As we both started the calibration but could not go through the whole process, it could explain why we have this problem others don't.
I will have a look with the initial backup version of my calibration file.

Would you be able to dump your nand?
flatlander:

--- Quote from: fremen67 on October 27, 2014, 10:55:29 am ---
Quote from: flatlander on Yesterday at 12:23:16 PM
OK, after a bit more experimenting, calibration seems related to this issue. I used the calibration function of the generator and found that it starts with a DC voltage calibration followed by a AC voltage (sine upto 100MHz) calibration. I stopped about halfway through as it's a very laborious process and only wanted to see if it made a difference (entered many more values than the 12 values reported in this thread without issue though). Looks like the calibration issue may have been fixed in my version of the firmware.

It definitely had an impact as the decreasing amplitude now starts around 25MHz versus the 5MHz earlier. I suspect Hantek started to only calibrate the generators up to 5Mhz.

I would still be keen to try a cal file from a unit that doesn't have the issue (or less severe, the calibration can't be too far off).

--- End quote ---


That makes sense. As we both started the calibration but could not go through the whole process, it could explain why we have this problem others don't.
I will have a look with the initial backup version of my calibration file.

Would you be able to dump your nand?

--- End quote ---

--- End quote ---

@ fremen67: nanddump uploaded to http://www.filedropper.com/hdg2002b10021409260
--- End quote ---
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