An IEPE, or Integrated Electronics Piezoelectric, sensor is an accelerometer or microphone with a built–in amplifier. It uses a single coaxial cable for signal output and power input. Normally, these sensors can be used only with specialised, expensive measuring instruments that have a suitable power supply built in, or with an external IEPE power supply. Now, following a number of customer requests, we have developed a PicoScope with IEPE capability.
The PicoScope 4224 IEPE is a 12–bit, 2–channel precision scope that is compatible with industry–standard IEPE accelerometers and microphones. Equipped with standard BNC connectors, it can also be used as a standard 2–channel oscilloscope similar to the regular PicoScope 4224. We also supply an IEPE accelerometer with a range of ±490 m/s2 (±50 g).
PicoScope 4224 IEPE Essential Specificatons
|Bandwidth||1.5 Hz to 20 MHz (IEPE mode)
DC to 20 MHz (voltage mode)
|Maximum sampling rate||80 MS/s|
|DC accuracy||±1% of full scale|
|Input ranges||±50 mV to ±20 V|
|IEPE output current||4 mA|
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Recently, in PicoScope 6.4.10, we added the ability to show in the waveform buffer overview only the waveforms that failed a Mask Limit Test. If you're not normally interested in Mask Limit Testing, you may have overlooked this feature, but it can be very useful when you are looking for an infrequent glitch.
Imagine that you have a square wave with an occasional spike that you want to capture. You could switch PicoScope to Persistence mode. In time this will catch the spike, but the display will show an overlay of a large number of waveforms with noise, making it difficult to see the exact shape of the spike. The new Mask Limit Test feature allows you to capture the spike without adding the clutter of the Persistence display.
To use this feature:
Set up PicoScope to trigger on individual pulses in the square wave. For best results, use “Rapid” trigger mode, which captures successive waveforms with minimal trigger re–arm time.
Go to Tools > Masks > Add Masks, select the channel of interest, and click Generate. This generates a testing mask, which appears as a colored area surrounding the waveform.
If necessary, edit the mask to include the normal waveform and exclude the spike. (Right-click, Mask, Edit.)
Start PicoScope capturing, and wait until the waveform buffer is full.
Inspect the waveform buffer using the Buffer Overview button. This will initially show all the waveforms captured, but if you open the drop–down menu and select “Show only Mask Limit Test failures”, only the captured waveforms with a spike will be displayed. You can select any of these waveforms to display in the main view.
We introduced a new version of the PT-104 Data Logger in last month’s newsletter. It has four precision measuring channels suitable for all types of PT100 and PT1000 sensors. Another feature that is sometimes overlooked is its ability to measure voltage and resistance with 24-bit resolution. In case you are still wondering whether it’s the product for you, here are some more detailed specifications for all of the PT-104’s measurement types:
|Specification||Temperature Mode||Resistance Mode||Voltage Mode|
|Range||-200 to +800 °C||0 to 375 Ω
0 to 10 kΩ
|0 to 115 mV
0 to 2.5 V
|Accuracy (25 °C)||0.01 °C||20 ppm||0.2% (2.5 V)|
|Temperature coefficient||5 ppm/°C||5 ppm/°C||100 ppm/°C|
|Resolution||0.001 °C||1 µΩ||1 µΩ|
PP682 PT-104 Data Logger £399 ($658/€482)
Here are some of the questions that have cropped up recently on our support forum:
Q. With a positive–only signal, for example 0 to 5 volt TTL, is it possible to remove from view the negative half of the input range to expand the signal to the full screen in PicoScope?
A. Yes. The quickest way is to add some vertical zoom using the zoom tools to make the waveform fill the display. You can also make a custom 0–5 volt probe that you can call up at any time from the channels toolbar. Duplicate the x1 probe into your custom probes library. Then edit the probe, changing the range management to advanced, auto generate ranges, and then add your desired 0–5 volt range. Have your scope plugged in when you do this so you generate all the hardware ranges for that model.
Q. I would like to measure humidity up to 100%. Is this possible with the EL030 and which probe do you recommend?
A. The EL030 measures 0-90% RH non-condensing. If you need a sensor that goes to 100% then perhaps you could go to either Rotronic or Vaisala. These sensors can be integrated into our unit using the EL037 which accepts inputs from ±5 V, ±10 V or 4–20 mA.
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Please visit https://jobs.picotech.com/ to see our current vacancies. We look forward to hearing from you!
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Pico Technology, James House, Colmworth Business Park, St. Neots, Cambridgeshire, PE19 8YP, England
Tel.: 01480 396395 (+44 1480 396395)
Fax: 01480 396296 (+44 1480 396296)
Pico Technology North America Inc.
320 N Glenwood Blvd.
Tel:+1 800 591 2796 (Toll Free)
Fax:+1 620 272 0981