1. Product description
*One meter is multi-purpose, one meter can be used as a photoelectric tachometer for non-contact speed measurement (r/min); it can also be used as a contact tachometer for speed and linear speed measurement (m/min, ft/min ) for contact measurements.
*Digital display, no parallax.
* Wide measurement range and high resolution.
*Automatically memorize the maximum, minimum and last measured value during the measurement period.
*Sturdy and delicate structure, easy to carry. The whole machine adopts durable professional electronic components; the outer shell is made of light and hard ABS plastic, which is beautiful in shape and easy to use.
2. Technical Parameters
Display: 5-digit 10mm LCD display
Test range: photoelectric: 2.5~99,999 rev/min (r/min)
Contact: 0.5~19,999 rev/min (r/min)
Linear speed: 0.05~1999.9 m/min (m/min)
0.2~6,560 ft/min (ft/min)
Resolution: Speed: 0.1 rpm (0.5~999.9 rpm)
1 rpm (over 1000 rpm)
Linear speed: 0.01 m/min (0.05~99.9 m/min)
1 m/min (above 100 m/min)
or 0.1 feet (0.1~999.9 feet/min)
1 inch (above 1000 inches/min)
Measurement accuracy: ±(0.05%n+1d)
Sampling time: 1.0 seconds (below 60 rpm)
Range selection: automatic switching
Memory function: automatically memorize the maximum value and minimum value during the measurement period
value and last measured value
Time Base: Quartz Crystal
Effective distance: 50~150mm (typical value) up to 300
mm depends on the brightness of the LED
Power supply: 4X1.5VAA5 batteries.
Power consumption: Approx. 90mA (during measurement)
Operating temperature: 0~50℃
Size: 210X60X38mm
Weight: 180g (including battery)
Standard accessories: host
Speed wheel
tapered adapter
funnel adapter
carrying case
manual
4. Photoelectric measurement procedure
4.1 Put the function switch in the "PHOTO" position.
4.2 Stick the reflective paper on the object to be tested, press the measurement button, and aim the visible beam at the target. When the reflective paper passes through the beam , the monitor light will be on.
4.3 When the displayed value is stable, release the measurement button. At this time, there is no display , but the maximum value, minimum value and last displayed value during the measurement period are automatically memorized in the meter.
4.3若被测转速小于60转/分，建议均匀地多贴上几张反光标记，此时读数值除以反光标记的个数即可得到实际转速值。应注意非反射面积需要比反射面积要大，若被测物体表面反光，建议涂些黑漆后再贴上反光纸。在贴上反光标记之前，转轴表面需要干净、平滑。
5.接触测量程序
5．1转速测量
A.将功能开关置于“CONTACT”位置。
B.按下测量按钮，并将适配器顶在旋转转孔的中心，当读数稳定时，释放测量按钮。
5．2线速度测量
A．将功能开关置于"m/min”(SURFACESPEED)位置或"ft/min”(SURFACESPEED)位置。
B．按下测量按钮，并将线速度轮附在待测物体上同步转动，当读数稳定时，释放测量按钮。
6．记忆功能说明
当释放测量按钮时，显示器无任何显示，但测量期间的最大、最小值及最后一个测量值（如图2所示）都自动存储在仪表中。只要按下记忆按钮，测量值就显示出来，先显示数字，后显示出英文符号，交替显示。其中“UP”代表最大值、“dn”代表最小值，“La”代表最后一个值。每按一次记忆按钮，则显示另一个记忆值。（见图二）。
7.更换电池
7.1当电池电压约5V时，显示器右边将出现电池符号，需要更换电池。
7.2打开电池盖，取出电池。
7.3依照电池盒上标签所示，正确地装上电池。
7.4如果在很长一段时间内不使用该仪表，请将电池取出，以防电池腐烂而损坏仪表。
