Products > Test Equipment
Hantek 2000 series - 2C42/2C72/2D42/2D72
sega:
3PEAK makes a 12bit DAC in a TSSOP-28 case? Why is the markings on the hull erased?. Read about the DAC on the forum.
MCU: STM32F103VET6
ADC: AD9288BSTZ-40
FPGA: LATTICE XO2-1200U
DAC: 3PD5651E
DMM (multimeter): CS7721CN-1
OU amplifier at the output of the generator (put different): EL5166, LMH6702
Near Oh the missing SOT-23: BAV 99
gf:
Given a DAC range utilization of about 90% (some headroom for gain/offset calibration), 5Vpp AWG output voltage and 12 bits, one LSB step calculates to about 1.36mV. For 10 bits, the resolution would be only 5.43mV. How could I measure a resolution of better than 1.5mV at the output if it were only a 10-bit DAC? I have absolutely no doubts that at least the DAC in my genuine 2D72 does resolve 12 bits.
[ I do not trust the fractional millivolts displayed by my DMM, but it still can clearly distinguish ~5.5mV steps from ~1.5mV steps in its 200mV range. On my other scope @ 2mV/div I can clearly distinguish these magnitues as well, despite 500uVpp noise. ]
EDIT:
For better accurracy measured once again with scope, now using 64x averaging acquisition, and let the scope display the avg voltage along the timeline. One of the DAC steps reads 5.00mV, and the subsequent one 6.37 mV. The difference is pretty close now to the calculated 1.36mV.
Btw, there is one observable similarity to the specs of the 3PD5651E:
The voltage at Rset measures 1.11V. The 3PD5651E has a specified internal reference voltage of 1.1V, while DAC902 has 1.24V.
But there is also a difference to both, 3PD5651E and DAC902:
Both were supposed to output the reference voltage at pin 17, but there is no voltage on pin 17.
The required minimum setup and hold times of 2ns+1.5ns given in the 3PD5651E datasheet were IMO too large for 250MSPS operation either -- this would leave ony a window of 500ps where the data are allowed to change - I doubt that the FPGA can fulfill this. Even the typical setup and hold times given in the DAC902 datasheet of 1ns+1.5ns are already pretty tight, but would at least grant a window of 1.5ns for the data to change (but still challenging). Well, maybe this is even the cause for one of the nasty problems with this AWG. I have some evidence that the origin of the spikes/glitches might be on the digital side of the DAC, but not sufficient evidence to prove or disprove it (don't have fast enough equipment to measure the timing on the DAC inputs and clock).
NovoTemp:
Hello, friends.
I need to check AC wave form from power outlets (AC 220V) at home.
Can I do it with Hantek 2D72? Is probes is suitable for it? I need to use 1:10X position?
Please advise.
Best regards.
Awaiting your soonest reply.
1937:
Saw empty seat places on the board and I asked the developers to add software support for the micro sd card and wi-fi module on this page:
https://www.eediscuss.com/forum.php?mod=redirect&goto=findpost&ptid=14668&pid=18035&fromuid=28755
I think it could be useful to save the waveform images directly to tf-card in the device or to receive data from the device via a wireless line.
If someone will support my idea on the eediscuss.com forum, it would help in its implementation.
gf:
--- Quote from: NovoTemp on March 28, 2019, 12:17:01 am ---Hello, friends.
I need to check AC wave form from power outlets (AC 220V) at home.
Can I do it with Hantek 2D72? Is probes is suitable for it? I need to use 1:10X position?
--- End quote ---
Hantek's PP-xx probes are rated 600V peak when the switch is in x10 position.
http://www.hantek.com/en/ProductDetail_73.html
And the input protection voltage of the 2000 series' scope is specified with 150V in the handbook, which is not supposed to be exceeded either when probing a 230V RMS sine wave with an intact 10:1 probe.
If there were any significant overvoltages (say 1000V spikes) on the power line, then you would exceed these limits, though.
Please don't blame me if Hantek doesn't meet their specs - it's up to you whether you do trust or do not trust the spects.
[ Btw, be careful and keep in mind that 230V mains are potentially lethal. If you don't trust the probe's insulation, then don't touch ground, but keep your body insulated from ground when you touch the hot wire with the probe tip, in order that no current can flow through your body. ]
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