The DL350 ScopeCorder has a number of modules allowing the user to tailor it for a variety of field duties, which is where it is most at home though it can also be used on the bench
APPLICATION EXAMPLES
EVALUATING ELECTRIC VEHICLE INVERTER I/O VOLTAGE PERFORMANCE By combining the DL350 with high-speed isolation and CANbus modules, engineers have a tool to measure electric vehicle (EV) drivetrain efficiency and performance. It will measure the fluctuation of the input/output voltage of the drivetrain inverter, trend speed, accelerating and braking rates translated by CAN communications simultaneously and continuously for up to 2.5 hours at a sample rate of 200kS/s. Optional GPS can be included to add co-ordinate information to correlate test-track location and measurement data.
INDUSTRIAL POWERLINE PERFORMANCE MONITORING The DL350 can be taken into the field fitted with a high-voltage isolation module and the “wave window trigger” function can be used to monitor and capture the power wave degradation caused by voltage sags, surges and interruptions. In this configuration, the DL350 is capable of measuring high voltage inputs up to 1kVrms, 1.4 kVpeak directly. The “action on trigger” function enables it to save the waveform to a file and send a notification automatically when the trigger event is detected, allowing for unattended operation.
recording for a specific duration and where the sampling interval is specified. A set-up wizard can be used in thismode to guide the operator quickly through the entire set- up process. Scopemode allows the DL350 to be
used just like an oscilloscope with all the associated benefits, including comprehensive triggering and flexible memory use. Using the historymemory enables up to 1,000 separate triggered acquisitions to be captured to the internal memory so that the causes and effects of abnormalities can be carefully analysed. Up to 5 Gpoints of data per module can
be recorded directly to an SD card. This means that the DL350 can be used for continuous recording for up to 50 days. For high-speed signals, up to 100 Mpoints per module of internal memory is available to capture fast transients. This is up to 10,000 times more than other portable oscilloscopes or oscilloscope/multimeters and allows signals to be captured with higher sample rates or over longer periods. A high-resolution, high-speed sampling
signal processing and analysis after the recording is finished. The DL350 offers compatibility with
many existing ScopeCorder inputmodules and thereby provides a potential cost saving to existing users. For users who aremore familiar with
chart recorders than with long-memory oscilloscopes, the DL350 offers a choice of operatingmodes. Recordermode is suitable for long-term, continuous
module, unique among portablemeasuring instruments, provides individually isolated 12-bit, 100MS/s inputs, which can preciselymeasure and record transient waveforms (superimposed on inverter outputs, for example) and the edges of control signals which cannot bemeasured by traditional handheld recorders or oscilloscopes. An 8.4in resistive touch screen has been
adopted to deliver superior noise-free performance. In environments with the highest levels of electrical noise, such as motors and inverters,measurement precision ismaintained while allowing it to be operated using gloved hands or a stylus. Even when the backlight is switched off, and the touch screen is inactive, the user
PREVENTIVE MAINTENANCE CHECKS FOR INDUSTRIAL ROBOTS To ensure the smooth running of automated production lines, engineers can use the DL350 with its 4-channel high-speed isolation module and acceleration/voltage module to check the health of production line robots. Using the FFT analysis function engineers can monitor and check vibration under acceleration data, which will give an indication of any potential failure. This will then allow the engineer to plan remedial action to prevent the potential failure and any resulting production line stoppage.
still has access to the start/stop,manual trigger and data saving keys. For users unfamiliar with state-of-the-artmeasuring instruments, there is also help at hand via the built-in instructionmanual. The user has a choice of a simple level
trigger or enhanced triggers on such things as pulse width, waveformperiod and across multiple channels. For example, the wave window trigger is ideal for AC power-line monitoring, and enables voltage sags, surges, spikes, phase shifts or drop-outs to be easily captured (available for 40-1,000Hz waveforms). A DL350 can be left unattended with the
captured waveformautomatically saved to a file, or a notification email sent if and when it triggers. The DL350 is first and foremost a field
tool.However, it still provides the functionality users expect in a bench instrument. The sampling clock, trigger and start/stop controls are all available as external signals, so that a rotary angle encoder or degree wheel, for example, can be used as the sample clock to analyse engine rotation and performance. The power in single and three-phase
systems can be evaluated. In addition, for fundamental waveforms of 50Hz or 60Hz, up to 40 harmonic orders can be analysed. Alternatively, it is possible to use the suite of FFT functions to performfull-frequency analysis. The DL350 is based on an A4-sized
compact chassis and weighs less than 2.6kg excluding battery and under 4kg including battery and 2 x 4 channelmodules. The built-in rechargeable battery provides three hours of continuous operation which, when combined with eithermains or 10-30V DC power, provides the DL350 with a highly reliable power supply and recording for tests that are difficult or expensive to repeat. EE
August 2017 /// Environmental Engineering /// 43
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