Product Feture:
1. This is a 5-bit high-precision digital tachometer suitable for measuring speed/frequency dual-use products. The frequency measurement accuracy is high, reaching 0.01 ‰ at 25 degrees Celsius, and the resolution can reach 0.001HZ
2. It can drive and provide pulse signals, and can also be connected to external sensors. The identifiable signals include: dry contact, NPN, PNP, pulse, etc
3. Wide voltage DC3-15V, flexible setting of frequency division value, all motors can measure speed as long as pulse signal can be provided
4. You can switch between two working modes of frequency and speed by pressing the button. The working mode is powered off for memory, and the frequency division value can be set according to different needs by pressing the button. The frequency division value can be set to ranges 1-99999 and 0.0001-9.9999 for power off memory
5. Wide frequency measurement range, 0.15HZ-100KHZ
6. Automatic range switching from 0.000HZ (R/M) to 000.00KHZ (KR/M)
7. With reverse protection, the positive and negative wires are connected incorrectly without burning, and the measured signal amplitude is 3-30V. Exceeding this parameter may cause damage
Product Introduction:
The newly upgraded tachometer (dual frequency) operates at a wide voltage of DC3-15V, and can recognize signals such as dry contacts, NPN, PNP, pulses, etc. The signal amplitude is 3-30V, and the number of pulses (signal frequency high/low) is proportional to the speed. Therefore, speed measurement is not related to the size of the motor's power appearance. As long as a speed pulse signal can be provided, speed measurement can be carried out. The speed signal can be directly provided by the motor drive or by an external sensor.
The meter head adopts an industrial grade high-speed MCU, which has strong anti-interference, stability and reliability, wide measurement range, and high measurement accuracy. The software adopts the leading full synchronous cycle measurement method, suitable for all motors on the market that can provide speed signal pulse output.
Main performance indicators:
Display digit: 5-digit LED digital tube display
Refresh rate: Signal frequency>3Hz: 3 times/second; Signal frequency ≤ 3Hz: approximately equal to the signal frequency.
Overflow display: "------"
Measurement accuracy: 0.1% ± 1 digit or 0.01% at 25 ℃
Measurement range: 0.15HZ-100KHZ, 9r-999.99Kr/m
Measurement method: full synchronous cycle measurement method
Input resistance: 100K Ω/resistive
Power supply: default DC3-15V
Withstand voltage: AC2000V 1min between external terminals and housing
Anti vibration: vibration number: 10-55HZ, acceleration 50m/s ² X. 5minX10 in Y and Z directions respectively
Operating environment (temperature and humidity): Temperature -10C -+70C Relative humidity 25-85% (without condensation)
Storage temperature: -20 ℃ -+80 ℃ (without condensation)
Large shell size: 79 * 42 * 26MM
Opening size: 76 * 39MM
Set usage instructions:
1. The meter head has 5 wires, with yellow indicating the signal input wire and the other two sets of red and black wires indicating the power supply wire. Any set of red and black wires can be selected for power supply (adding an additional set of red and black wires is convenient for supplying power to external sensors). The red wire indicates a positive power supply of 3-15V, and the black wire indicates the ground wire. The meter head power and signal wires are connected to the equipment to be tested separately.
2. Speed measurement and frequency measurement mode selection. There are two buttons on the back of the meter head, which are "M" mode and "S" mode. When the meter is powered on and waiting for measurement, briefly press the M button once to enter the mode selection interface. The display screen only displays the first 8 characters on the right. At this time, by continuously pressing the S button, the display screen will cycle between 0, 1, and 3 modes, displaying 0 frequency filtering mode, 1 speed filtering mode, 2 frequency filtering mode, and 3 speed filtering mode, After selecting a mode based on one's actual needs, waiting for about 4 seconds without any operation will automatically save the settings and return to the pending measurement state.
3. Setting the frequency division value. Before setting the frequency division value, first understand the concept of the frequency division value: the number of pulse signals taken when rotating the rotary table or gear for one revolution during speed measurement. For example, when an external NPN Hall proximity sensor or photoelectric sensor is connected, one revolution of the rotary table or gear generates one pulse signal, and the frequency division value is set to 1. Equipped with a three-phase brushless drive with speed pulse signal output from our store or a 6-step commutation brushless drive on the market without the need for an additional sensor, the speed measurement setting is as follows. The speed pulse signal output of the drive board is directly connected to the input signal of the meter head and correctly powered. According to the formula, the motor has 2 pole pairs * 3. If the motor has 2 pole pairs, the frequency division value is set to (2 * 3=6), which is 6.
The method for setting the measurement frequency is the same as above. For example, when measuring real-time frequency values, the mode is selected in the measurement frequency mode, and the division value is set to 1, with a unit of HZ/second. For example, the display format for 1 kHz is 01000, and the division value for special frequencies can be set according to your own needs. In the measurement speed mode, the unit is rpm, and the display screen can display 5 digits and 8 words. For example, the display format for 5000 revolutions is 05000, with a maximum display of 99999. If it exceeds 100000 revolutions, the decimal point will automatically shift, Display in thousands of revolutions format, such as 200000 revolutions, with a format of 200.00 (200 * 1000=20000)
When powered on and waiting for measurement, briefly press the S key once to enter the frequency division value setting interface, and the display screen will flash. At this time, briefly press the S key again. The function of the S key is to select 5 8-word shifts. To change which 8-word, simply press the S key briefly to shift to which 8-word, and the 8-word will flash. At this time, briefly press the M key again to change the size of the 8-word value. By shifting the S key, select the 8-word to change, and then use the M key to change the value of the selected 8-word shift, By combining the M and S keys, complete the setting of the frequency division value. If you want to set the frequency division value to 3, simply change the first 8 words on the right to 3. The display effect is set to 00003, and after setting it, wait for 7 seconds without any action to automatically save the setting and return to the waiting measurement state. The frequency division value must be within the range of 1-99999 or 0.0001-9.9999, and other values are invalid.
The method for setting the decimal point is as follows: in the frequency division value setting interface, press the S key briefly to shift to the far right of the display screen, and the decimal point in the lower right corner will light up. At this point, press the M key continuously to turn on or off the decimal point below the first 8 characters on the far left. (If this decimal point is lit, it will turn on the decimal point, and if it is not lit, it will turn off the decimal point) After setting, Wait for 7 seconds without any action to automatically save the settings and return to the waiting measurement state.
Operation video for header setting: http://cloud.video.taobao.com/play/u/null/p/1/e/6/t/1/421553049645.mp4
How to Determine the Number of Pole Pairs in a Brushless Motor Video: http://cloud.video.taobao.com/play/u/null/p/1/e/6/t/1/421905862899.mp4
Precautions:
1. It should be used within the parameters of this instrument and in normal environments.
2. Set the mode correctly according to the actual usage requirements and set the frequency division value correctly.
3. When connecting high voltage signals externally, it is recommended not to operate with power and not touch the chips and parts on the board with your hands.
Shipping list:
Tachometer X1
Accessory X1
