Endevco's Signal Conditioner Eliminates Ground Loops
The Model 4999 low-pass filter signal conditioner furnishes individual input ground isolation on each input channel to eliminate the group loops often encountered with multiple-channel measurements. You can use the Model 4999 for such applications as rotating machinery test cells and the nuclear services industry where a very low noise floor is required.
Housed in a 2U rack-mount package, the 16-channel Model 4999 offers an ultra-low-design in a 4-pole or 6-pole low-pass filter conditioner that supplies excitation current to IEPE-type sensors (ISOTRON, ICP) and remote charge converters. Although broadband noise is specified at less than 30 µV RMS, the Model 4999 actually measures at less than 15 µV for high accuracy with low-level vibration signals for any data acquisition system. It can be used with Endevco's Model 2771C low-noise remote charge converter and a PE sensor.
Seven front-panel-selectable, low-pass cutoff frequencies are configurable at the factory 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 single-ended, BNC IEPE constant-current or voltage inputs. An external calibration signal input allows setup of data-acquisition-channel thresholds using the individual channel cutoff frequency desired.
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