CBT clamp-on battery telemetry
Battery-powered clamp-on telemetry transmitter for two full strain gage bridges, in an IP67 housing that straps to shafts of 25 mm or more, with a 2.4 GHz digital link.
- 2
- Strain gage channels
- 48 h
- Battery life, one bridge
- 3 kHz
- Sampling rate per channel
- 25 mm
- Min shaft diameter
- Output±10 V analog
- Resolution12 bit
- HousingIP67
- Operating temperature−20 to 50 °C
Two bridges, battery powered, strapped to the shaft
The CBT is a wireless, battery-powered transmitter for two full strain gage bridges of 350 Ω or more, with an input range of 0.1 to 10 mV/V. It excites the bridges, conditions the signals and transmits them digitally on a 2.4 GHz link, at 3 kHz per channel and 12-bit resolution; the receiver gives a ±10 V analog output, with a total delay under 670 µs. Two 18650 rechargeable lithium batteries last 48 h with one bridge and 36 h with two. The IP67 housing weighs 140 g, 235 g with batteries, and runs from −20 to 50 °C, the battery limit.
The CBT straps to any shaft of 25 mm diameter or more with load-rated plastic zip ties, steel banding or hose clamps. On higher-speed shafts that need balancing, a counterweight is mounted 180° opposite the transmitter. The gain is programmed over USB, and a fixed 100 kΩ shunt resistor is fitted as standard, with other values available. The typical broadcast distance is 1 to 2 m in line of sight, and 16 RF channels are available. The system takes 9 to 36 V DC, 4.5 W.
It is used to measure half-shaft and axle torque on vehicles: the production shaft is gaged and calibrated, and a battery transmitter, which needs the least room, suits short tests.
Specifications
| Channels | 2 |
|---|---|
| Input | Strain gage bridge (full bridge) |
| Output | Analog voltage |
| Output range | −10 to 10 V |
| Sample rate | 3 kHz |
| Resolution | 12 bit |
| Latency | ≤ 0.67 ms |
| Bridge input range | 0.1 to 10 mV/V |
| Gain setting | Software (programmable by USB) |
| Shunt resistor | 100 kΩ (standard; other values available) |
| RF band | 2.4 GHz |
| RF channels | 16 |
| Transmission distance | 1 to 2 m |
| Supply voltage | 9 to 36 V |
| Power source | Battery |
| Battery life | 48 h (one bridge; 36 h with two) |
| Bridge resistance | 350 Ω (minimum) |
| Power consumption | 4.5 W |
| Battery type | 18650 Li-ion rechargeable (two) |
| Shaft diameter | 25 mm (minimum) |
| Weight | 140 g (235 g with batteries) |
| Operating temperature | −20 to 50 °C (battery limit) |
| Protection | IP67 |
Resources
Datasheets and manuals
Drawings
None for this product.
CAD models
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Related applications
-
Powertrain Axle and half-shaft torque Drive torque measured on the production shaft, with a slip ring or telemetry to bring the signal out. -
Electric EV powertrain torque Torque at each stage of the electric drivetrain, from gearbox shafts to the wheel, to see where power is lost. -
Efficiency Vehicle efficiency and power mapping Torque and speed measured at each driveline stage, from engine to wheel, so each power loss has a location. -
Powertrain Truck solid axle torque Drive torque on a truck solid axle, read by strain gages inside the shaft and brought out at the wheel.
In the same family
- Smaller, one channel CBT-mini
Battery-powered clamp-on telemetry transmitter for one full strain gage bridge, in an IP67 housing that straps to shafts of 25 mm or more, with a 2.4 GHz digital link.
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Split collar hoop with built-in telemetry and induction power, for strain gage or thermocouple channels on shafts of 23 mm and larger, with a radial thickness from 12.1 mm.
- Up to eight channels M560
Digital telemetry system for one to eight strain gage bridges or thermocouples, sampled simultaneously at 16 bits, with a 59 × 33 × 7.6 mm transmitter and ±10 V outputs.
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