HEM Data Products

DAWN Mini ADAQ (Analog-to-CAN)


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DAWN Mini-Logger Video

The DAWN Mini ADAQ™ measures a variety of input types including voltage, current, temperature, digital, frequency, PWM, and inclination. It outputs measured data to a CAN network.

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The Mini ADAQ is used with either the OBD or J1939 Mini Logger to store the data or transfer data via cellular or WiFi to a website, PC or mobile application.

Data Acquisition System

The figure below shows a schematic of the DAWN Mini system to acquire both in-vehicle network and analog data. The system uses two CAN networks that are independent. One is the standard in-vehicle network acquiring heavy duty or light duty vehicle data. The other is an instrumentation network using the Mini ADAQ to acquire analog data. The vehicle network will not see the instrumentation network; only the Mini Logger will. It is not required to acquire in-vehicle network data to acquire analog data.

ADAQ Schematic

Vehicle and analog CAN network diagram
Networks are independent; The Mini Logger stores the data from both networks.

More than one Mini ADAQ can be used to acquire additional channels. Different models can be combined to meet the number of channels and type needed. Channels are software programmable. This provides significant hardware expandability so that 3rd party sensors and measurement systems may be added or removed easily.

The Mini ADAQ has rugged construction meeting the IP67 specification. A voltage input is a high impedance input protected against shorts to GND or Vcc. Its small size means it is easy to install for in-vehicle testing and other field testing applications. The Mini ADAQ works well for a wide range of applications including performance, monitoring, R&D, and duty cycle measurements.


The DAWN Mini ADAQ models include:

  1. Mini ADAQ 1400™ with 14 channels:
    • 4 thermocouples – (Type J, K, T). Averaging options: none, moving, repeating
    • 7 analog ( 0-5V, 0-10V, 0-20mA, 4-20mA) – each channel is software programmable
    • 3 Universal (frequency, PWM, digital, thermistor, voltage, current)
  2. Mini ADAQ 1000™ with 10 analog channels
    • ( 0-5V, 0-10V, 0-20mA, 4-20mA, frequency/RPM, PWM, counter, digital)
  3. Mini ADAQ TC4™ – 4 thermocouple channels
    • (type B, E, J, K, N,R,S, or T)
  4. Mini ADAQ TC20™ – 20 thermocouple channels
    • (type B, E, J, K, N,R,S, or T)
  5. Mini ADAQ INCLN™
    • The inclinometer measures inclination angles in two directions.

In addition, the Mini ADAQ 1400 measures internally generated sensor excitation voltages (+5V ref), cold junction temperature values utilized in thermocouple voltage to ºC conversion, and power supply voltage.

The A/D is 12 bits for the 1000 and 1400 models. The sample rate is user-selectable between 0.1 to 200 samples/sec for each input (channel).

The TC models use a 24 bit A/D. The maximum sample rate per channel is 10 Hz. The thermocouple inputs and the two on-board cold junction temperature sensors are multiplexed to the ADC chip. It has programmable filtering for either 50Hz or 60Hz. Temperature is measured with a 0.001°C resolution. When installed properly, the scanner will send temperatures with +/- 1ºC accuracy typical at ambient temperature.


The ADAQ units are pre-configured by HEM Data for the desired channels and sample rates. If the customer wishes to customize an ADAQ unit without shipping to HEM Data, the customer can purchase the ADAQ configuration hardware and software.

DAWN Mini-Logger Video

J1939 Mini Logger™ OBD Mini Logger™ DAWN Telematics™ DAWN™ Software ADAQ Mini™ DAWN Dashboard™