CThe Combo Test Module (AIO-C) is designed to provide non-audio connectivity and control options for driving various fixtures associated with acoustic measurements. AIO-C is a configuration option for the AIO Test System and requires the AIO chassis to operate.

Hardware Features

  • 5 VDC 1A fixed power supply
  • 5 VDC variable battery simulator with
    current monitoring
  • 8 TTL level aux inputs (GPIO)
  • 8 TTL level aux outputs (GPIO)
  • Pressure, temperature, and humidity

Key Applications

  • Test environment documentation
  • Stress testing
  • Power usage
  • Battery drain performance
  • Interfacing to fixtures, devices,
    indicators, and other test gear.



The AIO-C module includes a stable +5 VDC power supply to power the DUT or test fixture.

The variable +1 mV to +5 VDC supply is ideal for battery simulation, and may be programmatically controlled to analyze audio performance, as well as shut-down and charging/switchover characteristics of the DUT under low-battery conditions. Additionally, output current may be monitored and an over-current shutdown threshold may be set.

All the inputs and outputs of the AIO-C module may be monitored and controlled via the AIO control panel or via the provided command-line and API interfaces.

Eight TTL-level GPIO inputs and eight GPIO outputs provide logic-level monitoring and control of DUTs, test fixtures, pass/fail lights, conveyers, switch closures, and other test devices. The open-drain outputs can sink up to 250 mA.

The pressure, temperature, and humidity monitoring capability of the AIO-C module has numerous applications. In routine testing, the documentation of environmental conditions helps verify that testing was done correctly. In stress testing, the sensors verify the conditions. In addition, the device temperature can be monitored under audio signals to check for excessive heating. The PTH sensor is available as an optional accessory from Echo.



Inner Module Outer Module Mic/Line Inputs Line Outputs Headphone Outputs Amp Outputs Impedance Digital 5VDC Fixed Battery Simulator GPIO PTH
AIO-C1 Yes Yes 8/8 Yes
AIO-AC AIO-A AIO-C 4 2 Yes Yes 8/8 Yes
AIO-LC AIO-L AIO-C 4 2 Yes Yes 8/8 Yes
AIO-HC AIO-H AIO-C 2 2 1 Yes Yes 8/8 Yes
AIO-SC AIO-S AIO-C 2 2 1 Yes Yes 8/8 Yes



260 to 1260 hPa absolute
-40 °C – 90 °C ±0.2°
±1.5 % relative humidity
5 VDC, 1 A max
1 mVDC – 5 VDC, 1 A max, with
current measurement
44.1 kHz – 192 kHz
USB 2.0 audio class compliant
Windows 10 or later, macOS
ASIO, WASAPI, Core Audio
90 – 264 VAC, 50/60 Hz, 60 W
17.5” (44.4 cm) x 8.75” (22.2 cm) x 1.75” (4.4 cm), 7.2 lbs (3.3 kg)
21” (53 cm) x 10” (25.4 cm) x 5” (12.7 cm), 8.75 lbs (4 kg)
22” (55.8 cm) x 22” (55.8 cm) x 12.6” (32 cm), 42.5 lbs (19.3 kg)