San Juan Capistrano, Calif.Endevco Corp. has introduced model 4999, a low-pass filter signal conditioner with individual input ground isolation to eliminate ground loops often encountered with multiple channel measurements.
Model 4999 is well suited for applications such as rotating machinery test cells and the nuclear services sector, both of which require a very low noise floor.
The 16-channel, 2U rack mounted model 4999 offers an ultra-low-noise design in a 4- or 6-pole low-pass filter conditioner that supplies excitation current to IEPE (ISOTRON, ICP) type sensors and remote charge convertors.
Although ultra-low broadband noise is specified at <30µV RMS, model 4999 actually measures at <15 µV for high accuracy with low-level vibration signals for any data acquisition system. It can be used with the Endevco model 2771C low-noise remote charge convertor and a PE sensor.
Seven front-panel-selectable, low-pass cutoff frequencies are configurable at the factory at time of order with standard frequency corners of 400, 800, 1600, 3200, 6400, 12,800 and 25,600 Hz ±2%. The device also features front-panel-selectable gain of 1 or 10 and accepts voltage type, IEPE and PE remote charge convertor inputs. An external calibration signal input is supplied for setup of data acquisition channel thresholds using the individual channel cutoff frequency desired.
On the front panel, each channel is provided with a gain selector switch, cutoff frequency switch, LED indicator for cutoff frequency selected, and input isolation/grounding switch. Front and rear panel test input connectors for injecting an external calibration signal are selectable for each channel. Rear panel BNC Isotron/IEPE, voltage inputs and outputs are provided. LED indicators are also included for gain selected and calibration test signal input.