AstroAI テスター 4000カウント デジタルマルチメーター サーキットテスター オートレンジ

思った以上に使えますね！コスパ最高です。

電池蓋のネジには、インサートナットが使われていて好感が持てる機能的にも普段使いならこれで十分だと思う。 モード切替の音は個人的にはそんなに気にならない。 スタンドの可動部の作りが耐久性に問題ありそうで、使うなら補強を入れるなどした方が良さそう。

オートレンジ便利です。 お値段の割に多機能で、テスターリードもしっかりしています。金メッキでないのは許せます。 ひとつ意見しますと、セレクタを回すたびにピッと音がしますが意味があまり無いと思います。 せっかくなので電流モード時にだけ鳴るとか、鳴り方が変化するとか、もう一工夫あると更に良いと思います。 －－結構残念なので以下追記－－－－ AC電圧レンジでは他メーカー品ではDCが重畳していてもAC成分のRMSが測定できると思いますが、これは警告音のようなのが出て電圧が表示されません。DC電圧に重畳しているリップル成分の測定はできません。自作派にはかなり不便。星を下げました。

ショートモードでビープ音が鳴るモデルが欲しかったので安く購入できて良かったです。またまだ使ってないけど温度センサーも付属しているのでいろいろ役に立ちそうです。液晶が大きくて見やすいです。

計測レンジが、少なく要約されているので、使いやすいが、付属のプローブが硬く、取り回しが、やり辛い。

定番商品だが、コスパも良く使いやすい。

期待通りです

液晶の文字が大きくて読み易いです❢

Nu kunde jag mäta lite startkondensatorer. Hur bra som helst. Blir bra i min verktygslåda för el arbete.

Très bonne outils au passage , tester aujourd'hui toute la journée RAS . Pour ceux qui cherche la notice en Français , la notice et disponible en Anglais en Pdf sur le web , ensuite vous faite traduire votre Pdf et vous avez la notice en Français Sa prend 2minute Je parle pour le AstroAi DT132A (4000)

Nice product

Toppertje.

After an intense review of what was available in the digital multi-meter (DMM) product space, I purchased four AstroAI TRMS 4000 meters based on competitive pricing with similar products with similar specifications. These multi-meters were purchased for use by middle and high school students that are participating in the National Science Olympiad program. The features that were required were simple to use, has an easy to read display, is both precise and has acceptable uncertainty, in a physical package that could withstand the abuse/misuse of the students. Most of the digital multi-meters in this same price category, as the TRMS 4000 were NOT auto ranging or too small to have a reasonable size display. The meters with similar features by Fluke, Extech and Amprobe, to name a few, varied in price from ten to twice as expensive. Since I needed four, all of those meters were immediately ruled out. When the TRMS 4000 meter arrived, a quick physical, hands on inspection, revealed a solid design that was well labeled, with an LCD display that was about the same size as my personal hand held Fluke DMM. To test the meters, I used a variety of batteries and precision one-percent resistors to compare the performance of each meter, against my Fluke and against each other. In all cases the TRMS 4000 meters within +/- 4 least significant digits in the three and a half digit mode and +/- 2 least significant digits in the three digit mode. Without doing any real statistical analysis and without true NIST traceable standards, I feel comfortable that these meters were precise with an uncertainty that was within 1% +/- 1 digit in the tested ranges, which seems to correlate well with AstroAI’s stated specification. I should note that the results I obtained with precision resistors was well within the stated specifications. Since these we to be used for Science Olympiad competition, and the general rules prohibit using dangerous voltages, I did not test the AC or higher DC voltage ranges. However seeing the excellent results with low voltage DC and resistance, I would feel comfortable using one of these as troubleshooting tool in a professional capacity on low frequency equipment and appliances. Because TRMS 4000 has a specified input impedance of 10 Meg Ohms, I would not recommend this for use on sensitive instrumentation or high frequency circuits where test input impedances > 100 Meg are recommended and generally required. I would also recommend not using any hand-held multimeter for directly measuring currents in excess of 1 amp even though they may be equipped to do so, external shuts should be used for these types of measurements. In summary, for the price, this is an excellent choice for the serious hobbyist and student. If I had it to do over, I would still purchase these DMMs.