![]() ![]() Secondly, it is a rather slow "Sampling" 'scope which means that for "higher" frequencies (potentially not far into the kHz region) it needs a "periodic" (continuous) waveform and a reliable sync / trigger signal. Unlikely, particularly for typical PICaxe projects, but it could be a very expensive mistake. Since it connects directly to your computer (USB connection for data and power) there is a slight risk that you might "destroy" the PC if you do something really bad. There are probably other advantages but I had better mention a few disadvantages: Also, as it uses your computer's screen, it's easy to take a screenshot (Print Screen), the "User Interface" is quite good and it has a storage / persistence capability for slower signals. It has several strengths and weaknesses: Firstly, it has two channels (plus an External Sync capability) it's amazing how often a second (displayed) channel is useful and sometimes it's absolutely essential. For example, I used it for a forum thread HERE (end of post #1). Personally, I have the original "DPScope SE" which uses identical software and is basically the same, but built inside a "box" with connectors for 'scope probes, etc. I reduced the delay until I could see the desired effect above. The scope showed that on my first pass, the delay was too long, running over into the next half-cycle. The program delays for a decreasing time before firing the triac to provide a "soft start" to a (simulated) A.C. Running at SETFREQ M16, "PAUSE 1" takes 317 microseconds incrementing to PAUSE 2 adds 250 microseconds. This screen shot from DPScopeSE shows that the triac on-time (red signal) was ramping as desired after being triggered by the zero-crossing trigger (blue): I like that it's so tiny, especially compared to the 70-pound used monster I had 40 years ago.Ī few days ago I wanted to look at the timing of an AC "cycle slicing" program which was attempting to capture a zero-crossing trigger of a 60Hz (North American) AC signal (tested using a 12V AC wall plug transformer) to fire a triac for an increasing period within the 8.33ms half-cycle time (120 half cycles per second). Tech-Scope, scope probe green, scope probe yellow, kV probe secondary, ground clamp, USB cable, Tech-Scope CD, one-year warranty and protective carry case.I don't need to use my DPScopeSE very often, but it's illuminating when I do. Ability to turn the scale display on or off.Ability to toggle the background between two colors.Ability to turn the grid lines on or off for strip chart.Ability to view the minimum, maximum and average values.Ability to view the data in following graph types:.Screen refresh is at the rate of 10 times/sec.Continuity check with audible beep features ability to turn audio on or off. Ability to save the screen shot of the display.Ability to enable or disable the scale display.Ability to enable or disable the scale grids.Ability to change the background color.Selectable glitch sensitivity: low - medium - high.Ability to capture the analog and digital glitches, along with the current waveform.Peak detect captures high speed signals at the maximum sampling rate, even at slow sweep speed and is user selectable.Auto setup automatically adjusts the vertical scale, the sweep time and trigger point.Automatic record stores waveforms in a circular buffer with 50 screens of data.Vertical cursors show time difference/frequency between the two cursors and waveform values at the selected points.Lab scope, ignition scope and digital multimeter display are user selectable.The included InfoTech software provides a vehicle-specific repair information database for testing most common vehicle components with step-by-step test procedures using a lab scope or multimeter. The Tech-Scope is capable of reading 40 million samples per second on each channel with 10M ohm input impedance eliminating the need for special adapters to capture signals from critical components. The tool features galvanic isolation not found on automotive scopes for hardware protection and includes an ignition scope and a digital multimeter with an ohm meter. ![]() The OTC Tech-Scope is a standalone two-channel high-speed lab and ignition oscilloscope with multimeter that allows service technicians to quickly and efficiently test and measure virtually all of the electrical and electronic components and circuits in a modern vehicle. ![]()
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