Summary of Contents for Michigan Scientigic CBT-micro
- Page 1 Clamping Battery Telemetry Model: CBT-micro & CBT-micro-3 User Manual Michigan Scientific Corporation...
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Page 2: Cover
Copyright © 2024 Michigan Scientific Corporation Details and specifications provided in this document are purely for informational purposes and are subject to alterations. No liability is accepted for errors or omissions. Michigan Scientific Corporation 8500 Ance Road 321 East Huron Street Charlevoix, MI 49720 Milford, MI 48381 (1-231-547-5511) -
Page 3: Table Of Contents
Contents Cover Introduction System Overview Full System Telemetry System Schematic CBT-micro transmitting unit Batteries M540 Transmitter M540 Receiver Power Cable Receiving Antennas Signal Output Cable System Set-Up Strain Gauge Bridge Connection Install Batteries CBT-micro Attachment Methods CBT-micro Installation Required Tools Mounting Location Mounting Power Switch and Shunt Sequence Transmitter Full Scale and Shunt Receiver Box Set-up Signal Output Range Sensitivity (Shunt Calibration) Appendix System Troubleshooting M540 Telemetry Pin-Out... -
Page 4: Introduction
Introduction Clamping Battery Telemetry-micro • Clamps to any shaft 25 mm (1.00 inch) or larger • Smallest weatherproof battery-powered telemetry package • One strain gauge bridge input channel • Up to 8 hours of battery life • Lightweight rugged IP67 housing •... -
Page 5: Specifications
Transmitter Power Two 10440 rechargeable batteries Receiver Power 9 Vdc to 36 Vdc, 1A max. each Continuous Battery Life 8 h for CBT-micro | 6 h for CBT-micro-3 Weight 145 g (181 g with batteries installed) Input Range CBT-micro 20 mV/V bridge input standard (other gains available) CBT-micro-3 20 mV/V, 4 mV/V, &... -
Page 6: System Overview
System Overview The CBT-micro System is comprised of the following components: CBT-micro transmitting unit, M540 Receiver, two receiving antennas, receiver power cable, receiver signal output cable, and optional counterweight. Full System Power Input Cable Antennas Signal Output Cable Receiver Counterweight... -
Page 7: Cbt-Micro Transmitting Unit
The LED indicator turns on when the transmitter has power. The input cable is for connection to a full strain gauge bridge. CBT-micro has one bridge input and one output with a fixed gain (standard 20 mV/V bridge input range) CBT-micro-3 has one bridge input and three outputs each with a different fixed gain (standard is 2, 4, 20 mV/V bridge input range). -
Page 8: M540 Transmitter
M540 Transmitter The M540 transmitter includes a strain gauge driver, amplifier, and anti-alias filter within the signal conditioning block. It sends the bridge output signal (measured across S+ to S-) via radio frequency (RF). The RF carrier transmits the digital data. Each time the power is switched on to the transmitter, a three-second-long shunt calibration sequence is initiated. -
Page 9: Power Cable
Power Cable The Receiver must be powered by a DC power source between 10 V to 36 V. A cigarette plug power cable is provided. Receiving Antennas Two receiving Antennas are provided with the system. For best reception, use both antennas and place them on opposite sides of the shaft from each other. -
Page 10: Signal Output Cable
The Signal output cable has four BNC connectors. CBT-micro CH1: Strain gauge bridge connected to the CBT-micro. Nominal full scale 20 mV/V. CBT-micro-3 CH1: Strain gauge bridge connected to the CBT-micro. Nominal full scale 2 mV/V. -
Page 11: System Set-Up
System Set-Up Strain Gauge Bridge Connection Wire your full 350 Ohm strain gauge bridge to the wire exiting the CBT-micro. Proper wiring to the strain gauge bridge is shown below. CBT-micro Strain Gage Bridge Wiring Green White Black Install Batteries Remove the Battery Lid (switch side) by removing the two M2.5x10 mm... -
Page 12: Cbt-Micro Attachment Methods
The force listed in the chart is the centripetal force of the CBT-micro + counterweight multiplied by a factor of safety of 2.5. The green cells show when two 50 lb. rated cable ties can be used. -
Page 13: Cbt-Micro Installation
CBT-micro Installation Required Tools Allen Wrench Cable Ties or Hose Clamps Cable Tie Tool... -
Page 14: Mounting Location
Mounting Location 1. Ensure the gauge location leaves enough clearance and space to comfortably fit the CBT-micro. 2. Include space to take the lid off and slide the batteries out. 3. Mark desired gauge location Counterweight Units: Inches Counterweight Units: Inches... -
Page 15: Mounting
Mounting Apply fusion tape to prevent slip during rotation. Pre-attach zip ties / metal bands. - Page 16 Mount CBT-micro on fusion tape, lid slightly overhanging. Partially tighten retention bands. Adjust counterweight to be 180 degrees from CBT-micro.
- Page 17 Tighten both retention bands. Zip tie tool for zip ties or 30 lb-in for hose clamp...
- Page 18 Connect CBT-Micro to strain gauge. Internal magnets used to remove / guide batteries. Secure strain gauge wires with tape or adhesive.
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Page 19: Power Switch And Shunt Sequence
Power Switch and Shunt Sequence Depress the power switch to turn on power to the Telemetry Transmitter. Immediately upon power up a 3 second Shunt Sequence is initiated. The Shunt Sequence can be used to set-up sensitivity of your strain gauge bridge. Transmitter Full Scale and Shunt The Telemetry Transmitter Gain and Shunt are fixed in the transmitter. -
Page 20: Receiver Box Set-Up
RF FAULT LED should be lit. Now turn on the switch of the CBT- micro. Mount the antenna as close to the CBT-micro as practical. The RF FAULT LED on the front panel of the receiver box will help determine the best antenna position and orientation during installation. - Page 21 RF Fault Receiving Antenna LED Indicator Coax Connectors Receiving Antenna Coax Connector Notes There is NO provision for zeroing the transducer bridge at the transmitter. If the bridge unbalance is too high (above about 5% of full scale), the strain gauge bridge can be padded with a resistor across one arm.
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Page 22: Signal Output Range
Signal Output Range The Default Output Range for Michigan Scientific Telemetry Receivers is ±10 Vdc. Upon request, this can be customized to other ranges, less the 10V, like 0 Vdc to 5 Vdc. The outputs for the diagnostic channels are listed below. •... -
Page 23: Sensitivity (Shunt Calibration)
Sensitivity (Shunt Calibration) A power-up calibration sequence is generated to provide the user a means to relate output voltage (the voltage recorded) to engineering units of torque. This sequence also allows for background noise checking. The calibration sequence can also help the user monitor bridge-offset or gain changes which may indicate a problem. -
Page 24: Appendix
Areas to check for problems are listed for each specific symptom. 1. Receiver Power Indicator Light Does Not Come On a) Check if the green LED is illuminated on the CBT-micro transmitting unit. If so, move to step b. If not, replace the existing batteries with fully charged batteries. -
Page 25: M540 Telemetry Pin-Out
M540 Telemetry Pin-Out 15 Pin D-sub Pin Number Function Channel 1 Channel 2 + Signal (Pin) Coax Connector Channel 3 RF Fault Low Batt Channel 1 Common Channel 2 Common Pin 9 Pin 15 Channel 3 Common (CAL) Common RF Fault, Low Bat Common Power Cable Pin A +12 Vdc...
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