| {gallery}Sanwa PM300 |
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A few years ago I looked for a replacement for my portable multimeter, the Appa iMeter 5, for which I was not fully satisfied. I have found a Sanwa PM300. I have been using it till now, and I am very happy with it. The quality of build is better in comparison to the Appa, it has a really good case. The test probes TL-39T are also very good and have removable test pin covers, which reduce the unshielded area of the pin. Additionally, it supports True TrueRMS on ACV. The only drawback is the lack of the current measurement, but it was really limited in the case of Appa. Below there is specification of Sanwa PM300:
Here is a more detailed specification from the user manual:
The specification as for a multimeter that can fit in the pocket is reasonable. I have performed some tests to show how it behaves in real usage.
The first test was to check DCV with usage of the AD584K voltage reference. Below the results:
| {gallery}DCV test |
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Voltage reference AD584K |
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Measurement of 2.5 V |
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Measurement of 5.0 V |
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Measurement of 7.5 V |
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Measurement of 10.0 V |
The next test was related to the measurement of precision resistors: one of 0.005% and the rest of 0.1%. Below there are results:
| {gallery}Resistance test |
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Measurement of Vishay S102CT 1 kOhm 0.005% 2ppm |
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Measurement of Vishay 10 kOhm 0.1% 25ppm |
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Measurement of 1 MOhm 0.1 % |
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Measurement of 150 Ohm 0.1% |
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Measurement of 15.1 Ohm 0.1% |
I have also performed a quick check of some diodes. Below are results:
| {gallery}Diode test |
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Measurement of 1N5817 |
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Measurement of BAV18 |
I have also checked the capability of measurement of capacitors. Below there are results:
| {gallery}Capacitor test |
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Measurement of 470 uF 16 V |
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Measurement of 47 uF 35 V |
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Measurement of 470 nF 63 V |
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Measurement of 33 nF 250 V |
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Measurement of 2.2 nF 400 V |
The last test was for ACV and frequency. For that purpose, I have used the waveform generator built in the Analog Discovery 3. Below there are results:
| {gallery}ACV and frequency test |
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Measurement of sinus 1 kHz 1 Vpp |
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Measurement of sinus 1 kHz 1 Vpp |
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Measurement of sinus 100 kHz 1 Vpp |
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Measurement of sinus 50 kHz 1 Vpp |
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Measurement of sinus 50 Hz 5V pp |
Here is check how ACV measurements behave in the case of a frequency change of 1 Vpp sinus signal from 50 Hz to 5 kHz. Below are the results:
| {gallery}ACV test |
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Measurement of sinus 50 Hz 1 Vpp |
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Measurement of sinus 100 Hz 1 Vpp |
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Measurement of sinus 200 Hz 1 Vpp |
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Measurement of sinus 500 Hz 1 Vpp |
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Measurement of sinus 1 kHz 1 Vpp |
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Measurement of sinus 2 kHz 1 Vpp |
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Measurement of sinus 5 kHz 1 Vpp |
The continuity check is quite responsive. Additionally, it is nice that it uses very low voltage at open, only 1.0 V.
Based on results, they are in the range of provided specification. Probably the things that could be nice to see in the next version, if there is one, will be a backlight and the possibility of measurement of current even in a narrow range. I saw on eBay the version PM300BT, which is probably dedicated to the Japanese market, which excepts standard PM300 features, and has support for Bluetooth for remote measurements via a dedicated application.