WOT Community Badge for updatestar. XP, 32 bit beginner’s guide to programming the pic24 dspic33 pdf 64 bit editions.
Simply double-click the downloaded file to install it. You can choose your language settings from within the program. Sorry, this site is frame-based. 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. On the next page I’ll discuss a few of the key specifications. Enclosure: Sturdy ABS plastic enclosure with custom glass-fiber front- and back-panel, silkscreen. First, it is a two-channel instrument.
This is a very important feature. It also prevents you from triggering on a signal different from the one you want to look at. Second, the bandwidth – the DPScope has about 1. That’s very useful to record slow-varying signals, e.
But now let’s dive into the design, and start with some pictures! Below is a block diagram of the oscilloscope. All this is necessary to make optimum use of the fixed voltage range that the analog-to-digital converters can convert into digital information. The sample logic controls the sampling process and the storage of the converted data in the capture memory. The trigger circuitry decides when to start the sample process.
On the right side you see examples for overcompensated — the DPScope’s frontpanel LED should blink a few times and then stay on. For A is dominant, it also prevents you from triggering on a signal different from the one you want to look at. The DPScope has about 1. Others are electrically equivalent but change the form factor, which has 470 Ohm. Amplification for large input signals, you can see that there really aren’t too many.
The controller takes care of setting signal gains and offset, setting up the sample logic, selecting trigger source, trigger level, and trigger polarity, and communicating the the PC. This makes the design very compact, inexpensive, and easy to build. USB interface to the PC as well as power supply for the scope are provided by the FTDI232R serial-to-USB converter cable – again a very user-friendly solution since there is nothing to assemble. Below is the full schematic. If you aren’t an experienced electrical engineer it may seem daunting at first, but we’ll break it down into easier-to-digest subsections in the following few slides. Signals smaller than that range will have reduced resolution, and larger signals will get clipped. The circuit shown here is for channel 1, but channel 2 looks identical.
First, the incoming signal is attenuated by a factor of 4. This increases the maximum voltage range to 20V. 200V with a 1:10 probe – but be VERY CAREFUL whenever working with such high voltages! The input divider deserves some further consideration.
74us and a bandwidth of just 0. This is much too low for our scope! The solution – if you can’t beat them, join them. Since nothing comes for free in life, it’s not surprising there is a price to pay – the capacitive divider causes the scope’s input impedance to drop for higher frequencies. Still this is a worthwhile tradeoff and thus such a compensation can be found in virtually every oscilloscope. 5V or 0V by more than one diode drop.
I tried and it is true! 1:10 gain stage that produces a signal amplified by 10, which in turn goes to CH1 of the PGA. That way the PGA can choose between less pre-amplification for large input signals, and large amplification for small signals. For that reason I added C14 which increases the gain at higher frequencies. It is chosen so that the gain increase starts approximately at the frequency where otherwise the gain would start to drop off, that way the flat gain region is extended to higher frequencies. Its effect is also clearly visible – much faster settling transitions – when using the scope to look at a fast-rising square wave.