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Hantek HDG2002B AWG: 5Mhz or 100MHz? Let's see!

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smgvbest:
Here's mine
I wonder how the ebay seller will respond to this one.
It also after being powered down all night reverted to Chinese for the language when I powered up for this photo



And I just notices after posting that the date/time is off again

Howardlong:
I wonder what a zoom unit is in this context?

Have you done a cal on both channels since doing any mods? Wonder if that has anything to do with it.

smgvbest:
I checked it both before and after the mod and in both cases it failed.
I have not yet done a cal on it but it does need it and seems to work ok but like you I am not sure what a zoom unit is.
first thing that comes to mind is maybe the range limits controlled by those relays.
During that part of the self test I do hear the relays trip a total of 4 times,  2x for ch1 and 2x for ch2

would you mind checking again and listen for how many times you hear them trip?
I counted every time I head them trip after the FPGA Well test.

fremen67:

--- Quote from: smgvbest on January 16, 2015, 08:46:44 pm ---I checked it both before and after the mod and in both cases it failed.
I have not yet done a cal on it but it does need it and seems to work ok but like you I am not sure what a zoom unit is.
first thing that comes to mind is maybe the range limits controlled by those relays.
During that part of the self test I do hear the relays trip a total of 4 times,  2x for ch1 and 2x for ch2

would you mind checking again and listen for how many times you hear them trip?
I counted every time I head them trip after the FPGA Well test.

--- End quote ---
There are 4 relays for each channel. You will find the schematics of channel 1 made by Cyber7 here:
https://www.eevblog.com/forum/testgear/hdg2002b-awg-firmware-reverse-engineering/msg538156/#msg538156

This is the same for channel 2, you just need to replace K4, K5, K6 & X5 with K1, K2, K3 & X4

K1(K4) is activating the x5 gain stage, K2(K5) is activating the x4 gain stage, K3(K6) is activating the channel output.
It's not clear what the X4 & X5 relays are doing.

I captured the data going to the shift registers (U24&U26) which are powering the relays when going from 0v to 10V with the DC function and when doing a selftest:
From 0 to 0.5V: no amplification
From 0.5 to 2V: K2(K5) is used: x4 amplification
From 2V to 10V: K1(K4) and K2(K5) are used: x20 amplification

During the selftest you should hear 5 clicks and not 4, each click beeing separated by 2 seconds :
1 - K5 ON
2 - K4 ON + K5 OFF
3 - K4 ON + K2 ON
4 - K4 ON + K1 ON + K2 OFF
5 - K4 OFF + K1 OFF

If I follow what is written on screen during the selftest, Zoom Unit 0 should be activated by K5 on channel 1 and K2 on channel 2, Zoom Unit 1 should be activated by K4 on channel 1 and K1 on channel 2

If K4 and K1 are dead (or not switched) on your HDG, you will hear only 4 clicks during the selftest (which is the case) and you should not be able to reach more than 2V on both output of your HDG. Could you check that?

Could you also tell us what firmware/hardware version you have?

Edit: I forgot to mention I have PCB 1002 with FPGA 11 and software upgraded from 1.00.1(140402.0) to 1.00.2(140926.0)

smgvbest:
Both CH1 and CH2 I hear the relays kicking is around 100mV, 2V and 5V

PCB       1004.1
SW        1.00.3(141225.0)
KERNEL 3.2.35
FPGA     30
KEY       3

and I got up to 20Vpp out

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