AEM 30-2500 AQ-1 Data Logging System - Manual (Page 19)

Page 19 10-2500 AQ1 Instructions RevD 102512.doc
SPECIFICATIONS
AQ1 Data Logger
Supply Current
150 mA (nominal)
Input Channels 4 x Analog 0-5V with optional pullup resistor
4 x Analog/Frequency 0-5V or 0-16.5V
3 x Switch to Ground Digital
Data Stream
1 x AEMnet
1 x RS 232
Accelerometer Internal 3 axis +/- 4G
Logging Rate 1000 samples per second (1KHz) Max
SD Card 2 GB included, 32 GB Max
Operating Voltage (nominal) 8-16 volts dc
Max Operating Temp
90C
Enclosure Size 4.8" x 4.55" x 1.44" (122 x 116 x 37mm)
Weight 0.5 lbs
Choosing Logging Rates
Choosing a logging rate for a channel involves considering a few different things.
Response time
The response time of a sensor is how long the voltage will take to change after it
has actually changed. This will help you determine what logging rate you should
set for a particular channel since there is no reason to have a very high update
rate for a sensor that cannot update at the same speed or faster. For example, a
coolant temperature sensor has a relatively slow update rate, so 10 Hz in the
AQ-1 software should be fast enough.
Log file size
If the sampling rate for many of the inputs to the AQ-1 are set to very high rates,
the data log files will become very large since there is far more information to be
gathered by the AQ-1. This will result in fewer logs able to be stored on the SD
memory card.
SD card limitations
Depending on the grade of the SD card, a high data logging rate could cause a
data loss if the data logging rate is set incorrectly. See Total Data Rate in the SD
card section below.
SD Card Information
SD vs SDHC
Secure Digital (SD) and Secure Digital High Capacity (SDHC) rated cards are
compatible with the AQ-1. SDXC and beyond are not approved for use.