CBT-mini clamp-on battery telemetry
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.
- 1
- Strain gage channel
- 28 h
- Max battery life
- 7 kHz
- Sampling rate
- 25 mm
- Min shaft diameter
- Output±10 V analog
- Resolution14 bit
- HousingIP67
- Operating temperature−40 to 60 °C
One bridge, battery powered, in a small package
The CBT-mini is a wireless, battery-powered transmitter for one full strain gage bridge of 350 Ω or more, with an input range of 0.1 to 10 mV/V and a fixed gain. Its M540 telemetry transmitter excites the bridge, conditions the signal and transmits it digitally on a 2.4 GHz link, at 7 kHz and 14-bit resolution; the receiver gives a ±10 V analog output, with a total delay under 200 µs. Two CR123A lithium batteries last 28 h, or 15 h if rechargeable. The IP67 housing weighs 145 g, 181 g with batteries, and runs from −40 to 60 °C.
The bridge is wired to the supplied Deutsch connector, and the batteries go in under a lid removed with an Allen wrench. The CBT-mini is laid on fusion tape and secured with zip ties, metal bands or hose clamps, with a counterweight 180° opposite on fast shafts. Pressing the switch powers the transmitter and starts a 3 s shunt calibration sequence. The receiver takes 9 to 36 V DC and two antennas, placed on opposite sides of the shaft; its RF FAULT LED guides their positioning, and a front-panel potentiometer trims the zero.
It is used on automotive half shafts: its installation manual assigns the channel to half-shaft torque, and the Michigan Scientific telemetry brochure shows a CBT-mini installed on a half shaft.
Specifications
| Channels | 1 |
|---|---|
| Input | Strain gage bridge (full bridge) |
| Output | Analog voltage |
| Output range | −10 to 10 V |
| Sample rate | 7 kHz |
| Resolution | 14 bit |
| Latency | ≤ 0.2 ms |
| Bridge input range | 0.1 to 10 mV/V |
| Gain setting | Fixed |
| Shunt resistor | 100 kΩ (standard; other values available) |
| RF band | 2.4 GHz |
| RF channels | 16 |
| Transmission distance | 3 to 4 m |
| Supply voltage | 9 to 36 V |
| Power source | Battery |
| Battery life | 28 h (non-rechargeable; 15 h rechargeable) |
| Bridge resistance | 350 Ω (minimum) |
| Power consumption | 4.5 W |
| Battery type | CR123A lithium (two) |
| Shaft diameter | 25 mm (minimum) |
| Weight | 145 g (181 g with batteries) |
| Operating temperature | −40 to 60 °C (battery limit) |
| Protection | IP67 |
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