Tinman, have you tried this hack on the DST1062B?
Do you know if the DST1062B has the same components as the DST1102B?
Thanks.
Afaik yes, all Tekway's are equal inside within model series:
DST1062B=DST1102B=DST1202B
DST4062B=DST4102B
DST3022B=DST3042B
The DST3xxxB are probably like DST4000B, but without SRAM soldered and with different FPGA config applied.
The DST4xxxB are a bit different then DST1xxxB (layout and XO), and of course FPGA config didn't match.
So as already said, hacks within model series are possible, but not accross.
Regards the DST1062B hack, it has been tested and confirmed as working by someone else.
On my DST1102B i can switch firmwares between 60-100-200MHz, there are of course measurable differences,
see attached picture (db vs MHz on screen)
Tekway seems to be broad-minded, the -3db bandwidth is always higher
than the model bandwidth (R&S SMY -> DSO ->T 50Ohm terminated)
>>> I should have read the thread more carefully!
I dont think so, there are 24 pages with 350 answers,
it took me one afternoon to read everything,
result was: I know less than before!
(because 95% of the thread is bla-bla-bla...)
Hi Tinhead,
In the plot Frequency/dB that you did with DST1202B fw in your DST1102B Hardware. Did you change the channel amp resistors etc for this plot/trace? I note that with DST1102B fw it is 0dB at 100MHz. If components were not changed, what is the plot/trace like with these changed.
Thanks for your help.
Please zip it and replace the attached, it is slowing down this page ...
>>> I should have read the thread more carefully!
I dont think so, there are 24 pages with 350 answers,
it took me one afternoon to read everything,
result was: I know less than before!
(because 95% of the thread is bla-bla-bla...)
I found this page for Hantek Scopes:
http://www.socratesblog.eu/?p=174
maybe it helps a little bit.
Hi Tinhead,
In the plot Frequency/dB that you did with DST1202B fw in your DST1102B Hardware. Did you change the channel amp resistors etc for this plot/trace? I note that with DST1102B fw it is 0dB at 100MHz. If components were not changed, what is the plot/trace like with these changed.
Thanks for your help.
this plot was created on very early 100MHz Tekway hw revision, where some parts are like in currenty 200MHz model
and some ~ like in 100MHz model. I should probably create a "proper" one from each model (current hw revision) hacked/not hacked.
In principle as already mentioned it will be a bit worse if you hack 60MHz to 200MHz bw, and almost equal (to my old plot)
if you hack 100MHz model.
For sure, if you change the few resistors it will looks like on original 200MHz model (current hw revision) - see attached
- sweep from HP8594E , 0-400 MHz in 50 ms. Channel 1 is connected with a known good LMR-195 N-to-BNC cable
with a 50-ohm terminator on the scope end. The knee occurs at about 2 ms = 400MHz*27ms/50ms=216 MHz, -3db point is about 266 MHz.
Hi Tinhead,
In the plot Frequency/dB that you did with DST1202B fw in your DST1102B Hardware. Did you change the channel amp resistors etc for this plot/trace? I note that with DST1102B fw it is 0dB at 100MHz. If components were not changed, what is the plot/trace like with these changed.
Thanks for your help.
this plot was created on very early 100MHz Tekway hw revision, where some parts are like in currenty 200MHz model
and some ~ like in 100MHz model. I should probably create a "proper" one from each model (current hw revision) hacked/not hacked.
In principle as already mentioned it will be a bit worse if you hack 60MHz to 200MHz bw, and almost equal (to my old plot)
if you hack 100MHz model.
For sure, if you change the few resistors it will looks like on original 200MHz model (current hw revision) - see attached
- sweep from HP8594E , 0-400 MHz in 50 ms. Channel 1 is connected with a known good LMR-195 N-to-BNC cable
with a 50-ohm terminator on the scope end. The knee occurs at about 2 ms = 400MHz*27ms/50ms=216 MHz, -3db point is about 266 MHz.
Am I correct in saying you meant "The knee occurs at 27ms" and not 2ms? 400MHz x (27ms/50ms) = 216MHz. The step at the right of the screen (13.5 divisions from the left) looks to be the point where the sweep ends (400MHz) and starts (0MHz) again. Do you know what the spike is that is at around 4 divisions from the left, looks to me as if something is wrong like a BNC connector problem? There is also a step at around 3.5 divisions from the left, should there be a step?
But all is ok if the -3dB point is 266MHz. I've never measured it but I wonder what it would be when a 200MHz probe is connected and used. That would make it worse. I take it that your test was without a probe, with the 50ohm terminator at the oscilloscope BNC connector.
Later I may change the resistors after I have my Tekway DST1102B running a English UI. Am I correct in saying that if you don't change the resistors (and adjust the compensation etc). And run it at 200MHz. Then you are better to get the Tekway 100MHz and not a 60MHz oscilloscope to convert/hack?
Yes, traces for not hacked and hacked for each model would be interesting and would show a lot on what performance to expect.
Thanks for your help.
no idea where the spike was coming from, not really important.
Do you know what the spike is that is at around 4 divisions from the left, looks to me as if something is wrong like a BNC connector problem? There is also a step at around 3.5 divisions from the left, should there be a step?
Do you know what the spike is that is at around 4 divisions from the left, looks to me as if something is wrong like a BNC connector problem? There is also a step at around 3.5 divisions from the left, should there be a step?It's from normal tracking generator function, switching of RF circuits inside the tracking generator prior to the sweep. It's in the "dead period" during sweep setup, so it's irrelevant.
no idea where the spike was coming from, not really important.
looks like a singal bounce to me, no big deal for the test.
0MHz is at the left of the screen. 400MHz is at around 13.5 divisions from the left. That makes the step and spike at around 3.5 and 4 divisions from the left, somewhere between 0MHz and 400MHz. Maybe around 3.75 divisions x(400MHz/13.5) = 111MHz. That's not during sweep setup but is during a sweep at around 111MHz.
0MHz is at the left of the screen. 400MHz is at around 13.5 divisions from the left. That makes the step and spike at around 3.5 and 4 divisions from the left, somewhere between 0MHz and 400MHz. Maybe around 3.75 divisions x(400MHz/13.5) = 111MHz. That's not during sweep setup but is during a sweep at around 111MHz.
no, check the picture, the spike was on 0MHz
Same but now connection is HP8567B, same cable, terminator (tektronix), 10dB suhner attenuator, scope BNC.
(I think attenuator reduce scope input reactance bad effects littlebit?? (less "ringing")
Same but now connection is HP8567B, same cable, terminator (tektronix), 10dB suhner attenuator, scope BNC.
(I think attenuator reduce scope input reactance bad effects littlebit?? (less "ringing")Probably reflections causing trouble. A high-impedance input is not a nice resistive circuit like a low-impedance transmission line, which is why all high bandwidth scopes have 50 ohm inputs. It's actually standard practice for scope bandwidth testing to use as much attenuation as possible (limited by the generator's output power), to eliminate exactly this problem.
I draw my front panel to fit the real oscilloscope.
For this had to completely disassemble the device.
Slightly changed design. Design Tekway I don't like.
In the tekway.zip - two good quality file (*.PDF).
I have just received my Tekway oscilloscope. It is:
Model: dst1102b
Soft version: 2.05.0 (100305.0)
Hardware version: 0x555583e8
I've purchased a USB UART RS232 3.3V TTL board to enable me to change the Menu Display to English.
On reading the instructions again, it said that there was a prehacked version for firmware versions before 2.6.xx.
Are the prehacked versions upgrades still available. Would like to make it a 100MHz or 200MHz oscilloscope with English Menu Display.
I also can't find a USB driver to run TTScop program via USB from my Laptop computer. Any idea where I can download this driver? I have Windows 7 64 bit.
BTW if someone have Tektronix "input normalizer" (small box with BNC connectors) it is useful tool (it need be just made for this capacitance value what is scope input)... but today can not find very easy.
BTW if someone have Tektronix "input normalizer" (small box with BNC connectors) it is useful tool (it need be just made for this capacitance value what is scope input)... but today can not find very easy.
It's just an adjustable capacitor in a box. A 10:1 probe accomplishes exactly the same: making sure the capacitance of all channels is the same so you can swap probes without checking compensation each time. Just compensate the probe to one channel, and adjust the other channels so the signal looks the same. The actual capacitance value doesn't really matter as long as it's within the compensation range of your probes. On scopes were you can adjust the input capacitance (which does not include the Tekway/Hantek scopes, as far as I know)