Campbell Scientific CR9000X Measurement and Control System - Manual (Page 44)

Overview
CR9052IEPE Anti-Alias Filter Module
CR9052IEPE MADE IN USA
OPEN
CH 1
SHORT
OPEN
CH 2
SHORT
OPEN
CH 3
SHORT
OPEN
CH 4
SHORT
OPEN
CH 5
SHORT
OPEN
CH 6
SHORT
FIGURE OV1-9. CR9052IEPE
The The CR9052IEPE module allows direct connection of Internal Electronics
Piezo-Electric (IEPE) accelerometers and microphones to CR9000X
dataloggers. A CR9052IEPE has six channels. Each channel has a BNC
connector, an open circuit indicator LED, and a short circuit indicator LED
which can indicate if the channel is over-or under-driven. Each channel has a
built-in constant current source, which is software programmable to 0, 2, 4, or
6 mA.
OPEN LED input Resistance code description:
Programmed Current Level
2 mA 4 mA 6mA
Red (Open) : > 15 KOhm > 7.8 KOhm > 5.2 KOhm
Green(connected) : < 15 KOhm < 7.7 KOhm < 5.2 KOhm
SHORT LED input Resistance code description:
Programmed Current Level
2 mA 4 mA 6mA
Red (Short) : < 1 KOhm < 500 Ohm < 300 Ohm
Green(connected) : > 1 KOhm > 500 Ohm > 300 Ohm
The CR9052IEPE can burst measurements to its on-board, 8-million sample
buffer at 50,000 measurements per second per channel. Using the FFT
spectrum analyzer mode, the module's DSP can provide real-time spectra from
"seamless", anti-aliased, 50-kHz, 2048-point time-series snapshots for each of
its six analog input channels. The decimated data can be downloaded to an
appropriate PC card at an aggregate rate of 300,000 measurements per second.
MEASUREMENTS:
VoltFilt Differential Filter Measurement
FFTFilt Differential FFT Measurement
The CR9052IEPE module measurements have two programmable time
constants available: 5 seconds and 0.5 seconds.
See Section 3.3 CR9052 Filter Module Measurements for measurement details.
See Section 7 Measurement Instructions for Instruction details.
OV-12