Model 4618B User`s Manual
Contents
1. 1 Remove any couplings from the dynamometer shaft 2 Place a precision voltmeter resolving at least 1 millivolt D C between pins 13 and 14 on the DYNAMOMETER ribbon connector pin 13 negative You may have to remove the connector cap on the cable or obtain access from inside the dynamometer rear panel 3 Adjust the dynamometer zero control for best zero dynamometer torque signal output on your voltmeter The object of the following steps is to alternate between the and Q Bal trimpots until you know that each is adjusted such that your output torque reading is just at zero on both trimpots While observing the 4618B Output Torque Reading 1 Adjust the Q Bal trimpot slowly try both CW and CCW rotation until the indicated torque value reads slightly higher then back off very slowly until the reading is zero or returns to the original value Repeat this procedure on the Q Bal trimpot work back and forth and set zero with a 1 flashing occasionally FULL SCALE TORQUE CALIBRATION 1 Complete the zero adjustment procedure outlined in the preceding paragraph Install the Dynamometer Torque Calibration beam as shown in the sketch on the next page 2 Rotate the TORQUE control on your power supply full CW for maximum applied torque With a precision weight apply a known torque at or close to full scale in the CCW direction Maintain the beam exactly horizontal and perfectly still 3 Observe the voltage reading on t2. 5 Calibration and Balancing There are calibration and offset adjustment controls for most of the analog elements in the 4618B Normally no adjustment of these elements is anticipated for the life of the instrument However all or part of the calibration and balancing procedures may be indicated if any of the following conditions exist e Atorque difference between CW and CCW full scale readings of greater than 2 least significant digits in standard resolution e Inability to zero the Torque reading with the ZERO control located on the back panel of the dynamometer There is no calibration for the digital speed reading accuracy Please refer to MODEL 4618B SPECIFICATIONS in this chapter PROCEDURE Routine Torque calibration and zero offset adjustments should always be done on the Dynamometer The torque signal offset and calibration controls within the 4618B are there to permit standardization to precise and known value inputs Warning The following requires removal of the 4618B top cover All connections and trimpot adjustments must be made only as specified herein and with caution There is an electrical shock hazard inside the 4618B All calibration and balancing potentiometers are contained on the circuit board identified TSC 1 located in the upper right corner of the 4618B chassis facing from the front The sketch shows that portion of the board where the trimpots are located and their identification TORQUE ZERO ADJUSTMENT
3. he voltmeter Across Pins 13 and 14 Adjust the TORQUE CALIB on the rear panel of the dynamometer for a voltmeter millivolt reading exactly equal to the true torque applied 4 Adjust the Q Cal trimpot until the 4618B torque reading is equal to the voltmeter reading and the true torque applied 5 Place the weight on the opposite side of the beam adjust the Q Cal trimpot to match the 4618B Torque reading to the true torque applied ACCESSORY TORQUE OUTPUT CALIBRATION With zero torque on the dynamometer nothing connected to the shaft 1 While reading the 4618B Torque Value adjust the Dynamometer ZERO Control for best zero reading 2 With a voltmeter resolving at least 1 millivolt D C connected between pins 2 and 4 on the ACCESSORY TORQUE SPEED OUTPUT connector adjust trimpot Qo Bal for best zero reading 3 Attach a Calibration beam energize the brake to hold the beam attach a weight to apply an amount of torque close to the dynamometer full scale rated value Adjust Qo Cal for the correct torque reading on the voltmeter MODEL 4618B SPECIFICATIONS Speed Accuracy 0 05 of the SPEED reading 1 0 RPM Torque Basic torque accuracy is controlled by the Dynamometer ZERO and CALIBRATION controls by the level of care and frequency of adjustment The Torque conversion elements within the 4618B contribute no more than a temperature related drift of up to 005 C_ of ambient change of reading Please refer to yo
4. ur Magtrol Dynamometer User s manual for additional information on Torque accuracy Testing Measurement and Control of Torque Speed Power Load Force Weight Tension Displacement MAGTROL INC 70 Gardenville Parkway Buffalo New York 14224 USA Phone 1 716 668 5555 Fax 1 716 668 8705 E mail magtrol magtrol com MAGTROL SA Route de Moncor 4B 1701 Fribourg Switzerland Phone 41 0 26 407 3000 Fax 41 0 26 407 3001 E mail magtrol magtrol ch Subsidiaries in e Germany e France e Great Britain e China Worldwide Network of Sales Agents www magtrol com Certified ISO 9001 2000 by Bi n 150887
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