The Siglent SHS800 series of Handheld Digital Oscilloscopes are a new addition to the Circuit Specialists line of test equipment. These handheld oscilloscopes are low cost, feature rich, handheld oscilloscopes that can be used in the field or on the bench to provide advanced troubleshooting capabilities. In addition to the Digital Oscilloscope mode of operation, these units also can be used as a digital multi-meter or a data logger/recorder. Several models are available with bandwidths of 60 Mhz or 100 Mhz. The SHS810 model was chosen for this evaluation since it is the highest Bandwidth unit offered by Circuit Specialists.
The Siglent SHS810 oscilloscope features a 100 Mhz bandwidth with a 1GSa/sec sampling rate and a memory depth of 2 M points. This provides sufficient capability for viewing a multitude of waveforms and the ability to capture intermittent and transient fault conditions. The Multi-meter mode of operation features a display resolution of 6000 points with the ability to measure voltage, current, resistance, capacitance, and diode test. The Recorder mode allows for long term measurement and data logging of oscilloscope or multi-meter trend plotting or oscilloscope waveform recording.
The oscilloscope features various trigger modes and settings, including auto, normal and manual along with five trigger types of edge, pulse, video, slope, and alternate. The pulse trigger mode is extremely useful for viewing complex waveforms that may be difficult to view on an analog scope. The scope may be set to trigger on positive or negative going pulses = to, < than, or > than a value adjustable from 20 ns to 10 sec. Slope trigger mode allows the user to trigger on distinct rising or falling edge pulses of an adjustable slope value. The slope may be adjusted within the range of 20 ns to 10 sec, and may be set to < than,> than, or = to the specified value. The video trigger mode is useful for viewing either NTSC or PAL/SECAM types of composite video signals, with the ability to trigger on specific video lines or only odd or even lines of video information.
Since the oscilloscope is a Digital Storage Oscilloscope (DSO), various mathematical operations may be performed on the waveformsapplied to the two channels. The operations available are Addition (CH1+CH2), Subtraction (CH1-CH2 or CH2-CH1), Multiplication (CH1 * CH2), Division (CH1/CH2 or CH2/CH1), and Fast Fourier Transform (FFT). The FFT operation is useful for observing the frequency content of the waveform.
The Recorder function is a useful feature not normally found on handheld oscilloscopes in this price range. It allows recording or saving of measured data to the devices internal memory. Two different modes of operation are available, Trend Plot and Waveform Recorder. Trend Plot allows data to be captured and saved then plotted as a function of time. Trend Plot may be used with either the oscilloscope or multi- meter mode of operation. In oscilloscope mode, both channels CH1 and CH2 may be captured and plotted. Waveform Recorder is used to record and store waveforms from the scope and then replayed or viewed at a later date. The recorded waveform may be stored in internal memory and then transferred to a USB Flash drive if desired.
One last feature of the Siglent oscilloscopes that is worth mentioning, is the availability of both Host and Device USB ports on the side panel. The Device port allows the unit to be connected and controlled by a remote Personal Computer (PC) and the Host port allows saving of data or waveforms to a USB Flash drive or printed on a PictBridge compatible printer.
The Siglent SHS800 series of Handheld Digital Oscilloscopes were found to be easy to use and included features not normally found on units in this price range. The unit performed at or better than the published specifications through all of the available functions. Two units are currently available from Circuit Specialists, the SHS810 and the SHS806. The only difference in these two units is the bandwidth and sweep time available.