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Quanterra Q380

Nominal Response Library
Element datalogger
Manufacturer Quanterra
Model Q380

Below is some configuration-specific information to help you locate your instrument response.

FIR Filters

Two version of FIR filters were used by the Q380 series digital signal processor (DSP). The first (tagged 900616 after the firmware version released February 1990) had non-normalized FIR coefficients. Each stage's gain varied slightly from 1, though the gain of the cascade as a whole was unity. The second version (tagged and released 920812N) had normalized FIR filters. The LOG channel notes the firmware version in use at the time of recording.
Typically, decimation for sample rates 1 Hz and higher took place in the Q380's digital signal processor (DSP). Subsequent decimation to 0.1 and 0.01 Hz streams took place in the datalogger's M680x0 processor. The fir filter that decimated 1 Hz to 0.1 Hz has a gain factor of 4.
A know exception to the typical cascade was used in the GSN network. GSN responses for sample rates from 20 to 80 Hz are identical, but for slower sample rates the cascades differ. Responses for GSN channels sampled at 1 Hz or lower are listed in the last section.

FIR Delays

Under the original Ultrashear system software, Q380 systems corrected data time stamps for standard FIR filter delays, but did not include a small delay associated with data buffering. Q380 systems running the newer Multishear software had time stamps that were corrected for both delays.
The responses given here describe Multishear data in that the "Estimated Delay" (Blockette 57, field 7) represents the delay related to the FIR filters and the "Correction applied" (Blockette 57, field 8) is the delay due to the FIR filters and additional buffering effects. To modify these responses for Ultrashear data, set the B057F07 "Estimated delay" to the B057F8 "Correction applied" value. (Both fields should have the same value.)

Configurations

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Showing 20 of 20

Final Sample Rate
Firmware Version
FIR Cascade Type
Formats
datalogger_Quanterra_Q380_FR0.01_FW900616_CTGSN
0.01 Hz 900616 GSN
datalogger_Quanterra_Q380_FR0.01_FW900616_CTTypical
0.01 Hz 900616 Typical
datalogger_Quanterra_Q380_FR0.01_FW920812N_CTGSN
0.01 Hz 920812N GSN
datalogger_Quanterra_Q380_FR0.01_FW920812N_CTTypical
0.01 Hz 920812N Typical
datalogger_Quanterra_Q380_FR0.1_FW900616_CTGSN
0.1 Hz 900616 GSN
datalogger_Quanterra_Q380_FR0.1_FW900616_CTTypical
0.1 Hz 900616 Typical
datalogger_Quanterra_Q380_FR0.1_FW920812N_CTGSN
0.1 Hz 920812N GSN
datalogger_Quanterra_Q380_FR0.1_FW920812N_CTTypical
0.1 Hz 920812N Typical
datalogger_Quanterra_Q380_FR10_FW900616_CTTypical
10 Hz 900616 Typical
datalogger_Quanterra_Q380_FR10_FW920812N_CTTypical
10 Hz 920812N Typical
datalogger_Quanterra_Q380_FR1_FW900616_CTGSN
1 Hz 900616 GSN
datalogger_Quanterra_Q380_FR1_FW900616_CTTypical
1 Hz 900616 Typical
datalogger_Quanterra_Q380_FR1_FW920812N_CTGSN
1 Hz 920812N GSN
datalogger_Quanterra_Q380_FR1_FW920812N_CTTypical
1 Hz 920812N Typical
datalogger_Quanterra_Q380_FR20_FW900616_CTTypical
20 Hz 900616 Typical
datalogger_Quanterra_Q380_FR20_FW920812N_CTTypical
20 Hz 920812N Typical
datalogger_Quanterra_Q380_FR40_FW900616_CTTypical
40 Hz 900616 Typical
datalogger_Quanterra_Q380_FR40_FW920812N_CTTypical
40 Hz 920812N Typical
datalogger_Quanterra_Q380_FR80_FW900616_CTTypical
80 Hz 900616 Typical
datalogger_Quanterra_Q380_FR80_FW920812N_CTTypical
80 Hz 920812N Typical
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