Series 320 three-channel telemetry system 1 to 3 channels

Three channels in a compact transmitter

The Series 320 is a digital telemetry system for one to three strain gage or thermocouple channels. Its transmitter has three channels, each configurable for a full bridge or a thermocouple, with its own gain, shunt and filter values; the bridge excitation is 3.0 V DC. All channels are sampled simultaneously at 3 kHz with 12-bit resolution. The transmitter measures 38.1 × 40.6 × 8.9 mm, weighs 25 g and runs from −40 to 125 °C on 4 to 9 V DC, 35 mA without gages, from a battery or by induction.

Data goes out on a 2.4 GHz FSK link, with at least 16 RF channels and a total delay under 670 µs. A programmable calibration sequence runs at each power-up, so the system zero and the preset shunt value of each channel can be checked. The receiver, 235 × 88.9 × 45.47 mm, runs on 9 to 36 V DC and gives ±10 V BNC outputs with 100 Hz or 1 kHz filters and a zero adjustment; it shows the status of received data and low transmitter power.

Its datasheet shows two transmitter assemblies built on it: an engine flexplate torque transducer and a propshaft torque transducer. With induction power, it suits continuous measurements in environments where batteries do not hold up.