However, they are not without problems. A commercial customer of a large industrial aluminum sash manufacturer complained of creaking noises when operati ng their large aluminum sliding doors. One reason for the noise can be attributed to some distortion or warp of the aluminum, which can be detected by an acceleration pick up sensor and a memory recorder.
Specifically, the manufacturer went to the customers site with the recorder and attached the sensor at 16 points around the sash equidistant from each other, set the level trigger, and recorded any creaking that occurred at unpredictable ti mes. By plotti ng the signal along a ti me series, the manufacturer was able to identi fy the locati on along the sash from which the creaking occurred, the magnitude of the vibrati on, and even the directi on the noise traveled. They took the data to improve product design as well as provide feedback to the contractors during installati on of the sash.
An MR8847-53 installed with 8 units of 8969 Strain Unit delivers 16 channels of measurement and recording. Because the accelerati on sensors can be directly connected to the Strain Unit, this was an eff ecti ve soluti on that was previously not achievable with the legacy 8841 Memory HiCorder and the standard 8936 Analog Unit, which would require an additi onal external amplifi er to drive the sensors.
The compact MR8847-53 is also designed for field use, making it ideal for on-site applicati ons such as this.