轉(zhuǎn)速計(jì)，又名轉(zhuǎn)速表、轉(zhuǎn)速儀，是機(jī)械行業(yè)的儀器之一，用來測定電機(jī)的轉(zhuǎn)速、線速度或頻率。常用于電機(jī)、電扇、造紙、塑料、化纖、紡織、汽車、飛機(jī)、輪船等制造業(yè)。 大多常用的為手持離心式轉(zhuǎn)速計(jì)。美國Checkline旗下的轉(zhuǎn)速計(jì)一般為數(shù)字式，有接觸式和非接觸式兩種測量。非接觸式采用光電器件測量，無連接軸，對被測件無任何影響，提高測量精度。

例如Checkline PLT-5000型是一款小型轉(zhuǎn)速計(jì)，精準(zhǔn)測量轉(zhuǎn)速和表面速度。適用于各種機(jī)械和材料處理應(yīng)用。

PLT-5000運(yùn)用：

The PLT-5000Pocket Laser Tachometer accurately measures RPM and Surface speed using contact or non-contact measurement techniques. This battery-powered unit is extremely compact for convenient portable use and is supplied in a rugged and attractive plastic housing that is ergonomically designed for optimum comfort.

CHECK-LINE小型激光轉(zhuǎn)速計(jì)PLT-5000，擁有非接觸式和接觸式兩種測量技術(shù)，可測量轉(zhuǎn)速和表速。機(jī)身小巧，攜帶方便，內(nèi)置電池。塑料材質(zhì)外殼結(jié)實(shí)美觀，增加產(chǎn)品使用舒適感。

When measuring RPM in the non-contact measuring mode, the PLT-5000 emits a precision laser beam that is aimed at a small piece of reflective tape, which is affixed to the rotating target.

The PLT-5000 is extremely easy to operate and quickly converts from non-contact operation to contact operation by screwing the contact adapter in place. In addition to RPM's, a wide variety of engineering units for surface speed and length are user-selected via the front panel buttons. Units include; feet per minute, meters/min, yards per minute, inches per minute and more.

A built-in memory stores up to 10 measurements plus minimum, maximum, average and last.

在非接觸式模式下，PLT-5000通過發(fā)射一條精準(zhǔn)的激光束到被測件的反光板上來測量轉(zhuǎn)速。PLT-5000操作起來非常簡單，只需要將轉(zhuǎn)換頭擰到適當(dāng)位置就可以快速的進(jìn)行接觸式和非接觸式兩種模式的轉(zhuǎn)換。還可以通過前面板上的按鈕來選擇自己想要的測量三個種類，轉(zhuǎn)速，表速和長度。測量單位包括：英尺/分，米/分，碼/分，英寸/分等。