통신 > DPScope - Build Your Own USB/PC-Based Oscilloscope

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BASIC4MCU | 통신 | USB | DPScope - Build Your Own USB/PC-Based Oscilloscope

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작성자 키트 작성일2017-09-01 11:17 조회1,561회 댓글0건

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DPScope - Build Your Own USB/PC-Based Oscilloscope

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Picture of DPScope - Build Your Own USB
IMG_7279
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Step 1: Instrument Specifications
Below you see the specifications of the instruments. If you are familiar with oscilloscopes you will see that the DPScope has pretty much all the features you'd expect from a decent lower-end instrument. 

If you aren't a number freak, feel free to skip this page as fast as you can :-)

On the next page I'll discuss a few of the key specifications.


Input:
       
Number of channels: 2
Analog bandwidth: > 1.3 MHz
Input impedance: 1 MOhm || 15 pF
Probe connection: BNC
Usable probe types: Standard 1:1, 1:10, 1:20 probes

Vertical (voltage) scale:

Vertical sensitivity (20 divisions):
- 5 mV/div to 1 V/div (1:1 probe)
- 50 mV/div to 10 V/div (1:10 probe)
- 100 mV/div to 20 V/div (1:20 probe)

Vertical offset: 0 - 20 divisions

Maximum voltage range    
-12V ... 20V (1:1 probe)
-120V ... +200V (1:10 probe)
-240V ... +400V (1:20 probe)

Probe compensation: yes (2 kHz calibration output)

Offset adjustment: yes

Horizontal (time) scale:
       
Max. sample rate (single shot): 1 MSample/sec
Max. sample rate (repetitive signals): 20 MSamples/sec

Timebase settings (scope mode): 0.5 usec/div ... 1 sec/div
Timebase settings (datalogger/roll mode): 0.5 sec/div ... 1 hr/div

Trigger:

Trigger source: CH1, CH2, auto (free run)
Trigger polarity: rising edge, falling edge
Trigger noise reject: yes (selectable)
Pre-trigger capability (i.e. can show what happened
before the trigger event): 0 - 20 divisions
Post-trigger delay (delayed scan, to look at the
signal long after the trigger event but with high
resolution): 0 - 200 divisions

Acquisition:

Record length (normal mode): 200 points/channel
Record length (FFT mode): 400 points/channel
Max. screen refresh rate: up to 40+ frames/sec
Datalogger mode (roll mode): yes (data can be logged to file in real time)

Display:

Real-time FFT: yes
FFT filters: Rectangular, Hanning, Hamming, Blackman
Averaging: yes (2 / 5 / 10 / 20 / 50 / 100)
X-Y mode: yes
Display styles (can be combined): Points, Vectors (Lines), Infinite Persistence

Time and level measurements: yes (using cursors)

Save & Restore:

Waveform export (e.g. to Excel):yes (CSV format)

Save/restore of scope setups: yes

PC Software:
       
PC connection: USB, 500 kbaud
PC software: Windows 2000, XP (SP3), Vista, 7
Minimum screen size: 800 x 600 pixel

Mechanical construction:

Power supply: through USB (5V / 250mA)
(external supply 7.5 - 9V / 300mA optional)

Approx. size (in enclosure): 4.5" x 2.6" x 1.2" (114 mm x 66 mm x 31 mm)
       
Component count: ~50
Solder connections to make: ~200
Required skill level for assembly: moderate; only through-hole components and DIP
packages (no surface mount or fine pitch parts)
Printed circuit board: Professional printed circuit board with corrosion-resistant, gold-plated pads and contacts (not cheap solder finish), with silkscreen
to denote component locations.

Enclosure: Sturdy ABS plastic enclosure with custom glass-fiber front- and back-panel, silkscreen. All
holes pre-drilled - no drilling required.

Microcontroller and USB interface: Fully pre-programmed; no programming required

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