Not every load is a well-behaved resistor. Test loads ranging from 0% to 100% resistive or non-resistive coverage — motors, transducers, and reactive components — need an amplifier that can drive across that entire range without the operator needing to guess at impedance matching. Aigtek's ATA-M series is built for exactly this general single-channel driving role.
Multi-Tap Impedance Matching for Variable Loads
Rather than a single fixed output impedance, the ATA-M series' output impedance can be matched via multiple taps, adjustable according to the actual test requirement. This means the same amplifier can be reconfigured for a resistive test load one day and a reactive transducer the next, without needing a separate amplifier for each load type — a genuine advantage for labs running varied test programs on the same bench.
The Three Models
| Model | Bandwidth | Voltage | Power |
|---|---|---|---|
| ATA-M2 | 10kHz–500kHz | 175Vrms | 200VA |
| ATA-M4 | 10kHz–500kHz | 345Vrms | 400VA |
| ATA-M8 | 10kHz–500kHz | 690Vrms | 800VA |
All three share the same 10kHz–500kHz bandwidth and overcurrent protection; the choice between them is simply the power level your load requires. Built-in output current (100mV/A) and voltage (10mV/V) monitoring via BNC connectors lets actual drive conditions be checked on an oscilloscope during test, the same monitoring approach used across Aigtek's single-channel amplifier lines.
Where General-Purpose Driving Fits
Damage detection in viscous fluid-filled pipelines is one documented application area for the ATA-M series — a reminder that "general-purpose" doesn't mean generic; it means the amplifier is genuinely capable across a wide variety of load types rather than tuned narrowly for one. This makes it a sensible default choice when the test load's electrical characteristics aren't fully known in advance, or vary between test setups.
Finch Electronic Solutions — Melbourne, Australia
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