Digital Caliper Operating Instructions |
Operating Instructions: 1) Before using, clean the surface of the protective sticker (the label over which the readout head travels) of digital measuring instruments several times with dry, clean cloth to remove water or other substances which might interfere with the smooth and dry travel of the readout head. 2) Working Environment: Temperature: 5-40 ¡ÆC; Relative humidity: below
80%. 3) Never apply any electric voltage onto the frame of a digital caliper; or scribe on it with an electroprobe. Its circuitry may be destroyed. 4) Zero Adjusting: Clean measuring faces (by rubbing a clean piece of paper between measuring faces) and connect one measuring face with another. The measurement can be reset to zero by pressing Zero-setting Button. The pushing force exerted in zero-adjusting should be equivalent as far as possible to the one exerted at time of measurement in order to reduce measuring error. 5) Measuring Instruction: Usually, Absolute measurement is taken, and 'Zero' is set as mentioned above. Difference measuring is usually taken to improve the accuracy in measurement. First, place a block gage (about a size of a measured item) or place other work piece of standard size) between measuring faces with proper pressure and then set relative the zero position with the Zero button. The difference of standard size is displayed at time of the measuring of an item (Because the difference of value is small, it's usually called difference measuring). The sum of difference and the above- mentioned standard size is the actual size of the measured item or the absolute size. 6) Data Output and Processing Most of our digital calipers have a data port (SPC) for data output. The port can be seen by removing a small cap on the slider (readout head) and can be connected with a PC or a printer for data processing or for the printing of analytical charts of the measured figures; via a special cable. Interface working method: Synchronous serial. Data: Binary code, 24 bits. Each datum will be transferred twice. The cycle is 300ms (20ms in fast reading state). Transmitting time: 0.5ms. Four wires (from left to right): Negative power(-), Clock pulse CP, Data D, Positive Power(+). Pulse range of data: Level ¡Â0.2V, Level ¡Ã1.3V Clock Pulse CP: 90 KHz, effective for high electrical level. 7) Replacement of battery Abnormal display (digits flashing or even no display) indicates a dead battery. The 1.55V silver oxide button cell should be replaced (battery #SR44 which is widely available: as it fits many other electronic devices). |