The device EL-BULT14 is able to produce TTL trigger pulses out of an- The channel selectors can be used to route the amplified input signal alog signals from optical (Laser), reluctance, capacitive and eddy-cur- as well as the trigger output pulse from one of the 14 channels to the rent sensors. The main application of the EL-BULT14 is to convert sen- front BNC connectors for monitoring purposes. sor signals to TTL pulses in structural health monitoring and vibration measurements of compressors and turbine blades. Each of the up to 14 channels has a corresponding input (Probe In) and trigger pulse out (Pulse Out) BNC connector on the rear side of the device.

Block Diagram Key Capabilities • Gain factors 1, 10, 100 • Trigger on negative or positive slopes • Trigger level from (-9 to +9 V) / Gain • Adjustable hysteresis • Bandwidth DC to 400 kHz • Max input voltage ±42 V Back plane Ch-Selector Logic Channel Selector Control Elements Trigger-Module The Channel Selector is an optional module for accessing all installed LTM1 output signals and amplified input signals from the front-side of the rack chassis. Green LED The green LED will flash at each generated trigger pulse. Red LED The red LED indicates that this channel is selected by at least one of...

Channel Specifications Input Amplifier Specifications of the Base Unit Number of channels Signals Adjusting of the Hysteresis The value of the hysteresis can be adjusted by a potentiometer, It is accessible by removing the top cover of the EL-BULT14 rack, Turning clockwise increases the hysteresis, The value of the hysteresis can be set between approx, 0,35 to 4,5 % of the amplifier range (e.g. 10 mV to 500 mV at gain=1). By installing the jumper J2, the hysteresis will be increased by a factor of approx, 3 (e.g 30 mV to 1,5 V at gain=1), This may be helpful at the use of reluctance sensors,