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Hantek 2000 series - 2C42/2C72/2D42/2D72

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gf:

--- Quote from: gf on February 07, 2019, 07:31:51 pm ---DVM is isolated from the oscilloscope, and the insulation did withstand 1kV as well, >= 2000MOhm - beyond the limit of my insulation tester

--- End quote ---

Nevertheless, the power supply transformer for the DMM still does not convince me fully - the distance between primary and secondary windings is pretty small - less than 1mm. Is the cup possibly supposed to be filled with resin? The 5kV optocouplers are certainly OK, other insulation gaps/distances on the board look OK as well at the first glance (did not look under the battery compartment).

EDIT: Do I worry too much? Is the insulation capability of the enamelled copper wire alone already sufficient to provide the desired safey (as long as it is not damaged)?

gf

gf:

Hello forum, does anybody here have experience with the AD9288?

Is my understanding correct that the data of channel A are generally sampled by the T&H at the rising edge of ENCODE_A, and the data of channel B are generally  sampled at the rising edge of ENCODE_B, indepent of S1 and S2 pins? The timing diagrams in the datasheet are IMO not perfectly clear in this regard, since the inputs A and B are not shown separately, but only with a common line. The timing of the parallel outputs certainly is affected by S1 and S2, but I could not learn from the datasheet whether S1 and S2 also affect the samping at the ADC inputs.

Background of my question is that I notice a time offset between channels 1 and 2 on my 2D72, when both channels capture the same sigal, which is as large as 50ns at timebase settings of 10us/div and slower, and I suspect that this offset is caused by the way how the AD9288 is operated in the 2D72.

I have not checked all possible combinations of singe vs. two-channels enabled and all time/div settings, but for the combinations I did check I see that ENCODE_A and ENCODE_B are always 180° out of phase, regardless whether both channels or only a single channel is enabled. S1 and S2 are 1,0 in dual-channel mode, and 1,1 when only CH1 is enabled.

This could explain a time offset of 1/2 ADC clock period between CH1 and CH2 (where the ADC is clocked at either 125, 100 or 10 MHz, depending on the timebase setting. For >= 10us/div, the ADC is clocked with 10MHz -> 50ns offset).

gf

gf:
I'm facing gltches/spikes in the AWG output of my 2D72 at particular combinations of amplitude/waveform/frequency.

Please find more details here https://www.eediscuss.com/forum.php?mod=redirect&goto=findpost&ptid=14705&pid=17746.

I'm not absolutely sure yet, but I suspect a timing issue with not always meeting the setup times of the DAC inputs. Maybe it's also related to overclocking the DAC902 (250 vs 165 MHz) which has already been questioned in several previous messages?

gf

Microcheap:

--- Quote from: AxGxP on February 07, 2019, 10:38:56 am ---Do you have ST-Link? Can you readout a dump of from your device. It will be interesting to compare it with lower version.

--- End quote ---
Sorry for the delay, but finally I had time to open my meter to extract the firmware.

edit: Altered .bin file to hide the SN of my meter. Replaced with CN00000000000000-40


--- Quote from: gf on February 08, 2019, 08:21:27 am ---After removing the board and turing it around I noticed the same as you did - the markings on the ADC are not readable.

--- End quote ---
I found the manufacturer of the DAC chip it is a Chinese brand http://www.3peakic.com.cn/En/product/productes/catid/147.html but I still can't read the part number. There is also no 12bit DAC on the manufacturer web site, maybe it's a new IC I don't know but it is apparently pin compatible with the ISL5861, AD9762 or DAC902.


--- Quote from: gf on February 17, 2019, 06:11:01 pm ---
Please find more details here https://www.eediscuss.com/forum.php?mod=redirect&goto=findpost&ptid=14705&pid=17746.


--- End quote ---
Thanks for the information, I did open that thread to report some bugs I'm finding, I wanted to see Hantek's response.

tsman:

--- Quote from: Microcheap on February 19, 2019, 12:46:07 am ---Sorry for the delay, but finally I had time to open my meter to extract the firmware

--- End quote ---
Nice. The bootloader is in there as well and you've got the big block of data at the end of flash as well. Presumably that block has calibration and other things like serial number + model. What is strange is that block has "CN19XXXXXXXXXXXX-40" in it but that doesn't match up with the serial number label on your board. I wonder if the 40 indicates 40MHz since you have a 2D42. No clue if there are checksums etc...

[edit]Altered serial number[/edit]

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