Sample Rate - Gecko Compact Product User Manual

Sample Rate

Select Sample Rate
40 sps
> 100 sps
200 sps
250 sps
...<more>
Channel Naming
The naming of channels has been automated in the Gecko based on the selected sample
rate and sensor type, with preset channel names.
The SEED standard states that each channel requires a 3-letter code, where the first letter
indicates the Band Code, the second letter indicates the Instrument Code, and the third
letter is the Orientation Code. Detailed information on this standard can be found here:
https://ds.iris.edu/ds/nodes/dmc/data/formats/seed-channel-naming/
The Gecko will set the first letter of the channel name based on the sample rate:
• B: 40 sps
• H: 100 & 200 sps
• C: 250, 400, 500, 800 sps
• F: 1000, 1600, 2000, 4000 sps
The Gecko will set the second letter of the channel name based on the sensor type:
• H: Velocity Seismometer
• N: Accelerometer
• D: Pressure Sensor (e.g. Microphone)
• J: Rotation Sensor
• Q: Voltage
The Gecko will set the third letter of the channel name based on the channel number:
• E: channel 1, typically used for East, Transverse, or X
• N: channel 2, typically used for North, Radial, or Y
• Z: channel 3, typically used for Up, Vertical, or Z
• O: channel 4, typically used for Outdoor Microphone or an extra Vertical sensor
For example, the vertical channel of 40sps broadband seismograph would be BHZ, whereas
a horizontal channel of a 100sps structural monitoring accelerograph might be HNE or HNN.
The data stored as the vector sum of the 3D sensor is named SUM and will use the same
location ID as channels E, N, and Z to reinforce the association with those channels.
Some sample rates in the Gecko use an FIR filter to remove
frequencies above the Nyquist frequency, i.e. half the
sample rate, e.g. 50Hz at 100 samples per second (sps).
250, 500, 1000, 2000 and 4000sps do not use FIR filtering.
Scroll to the sample rate you wish to use, then press the
Menu button to exit and apply the new sample rate.
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