Campbell CR9000X, Instruction Manual

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Overview
OV-18
C opyright © 2000
C am pbell Scientific, Inc.
Printed April 2001
FFT Spectrum Analyzer
Fourier transforms applied to anti-aliased inputs described above
Number of channels: 6
Time series sample rates: programmable from 50 ksamples s
-1
to 5 samples s
-1
FFT length: programmable from 32 to 65,536 samples
Real-time spectral throughput
for six channels: 50-kHz or slower, 2048-point or smaller, seamless snapshots
for two channels: 50-kHz or slower, 65536-point or smaller, seamless snapshots
Optional time series windows: Hanning, Hamming, Blackman
Spectrum options: Real and imaginary, Amplitude and phase, Amplitude, Amplitude rms, Power,
Power spectral density, dB
Optional spectral binning to reduce final spectrum length
Linear spectral binning: 2
≤
m
≤
(FFT_length/2)
where programmable m adjacent bins are combined into a single bin
Logarithmic spectral binning: 1
≤
n
≤
12
where exponentially increasing spectral bin width gives 1/n Octave Analyses
Excitations
Number of continuous
excitation channels:
6
Programmable
Excitation Levels
Compliance Accuracy
10 V 85 mA ± 0.03 percent of setting, -25° to 50° C
± 0.05 percent of setting, -40° to 70° C
5 V 85 mA ± 0.03 percent of setting, -25° to 50° C
± 0.05 percent of setting, -40° to 70° C
10 mA 12 V ± 0.06 percent of setting, -25° to 50° C
± 0.08 percent of setting, -40° to 70° C
General
Over-voltage protection
on all inputs and outputs:
+ 50 V, -40 V
Current consumption
(at 12 V input):
500 mA + 1.5*[ I
ex
]
where I
ex
is the sum of excitation currents provided by all channels
Current consumption
for complete CR9000 system:
must be less than 4 A
Sensor connections use CR9052EC Easy Connectors for CR9052DC. The Easy Connectors consist of a terminal strip that is
easily disconnected from the CR9052. Customers needing to monitor several locations intermittently have found it useful
to buy several CR9052ECs and simply move the CR9000 and on-board CR9052DC(s) between monitoring locations.
We recommend that you confirm system
configuration and critical specifications with
Campbell Scientific before purchase.
CR9052DC Specifications
(continued)