5B45

The 5B45 and 5B46 protect the computer side from field-side over-voltage faults. All models  withstand 240 V rms at their input terminals without damage, thereby shielding computerside
circuitry from field-side over-voltage conditions. In addition, all 5B45 and 5B46 models are  mix-and match and hotswappable, so can be inserted or removed from any socket inthe same
backplane without disrupting system power.

Inside 5B45 & 5B46 Modules The 5B45/46 internal circuitry compares the input signal to the  user-selected threshold (VT)and hysteresis (VH). Signals of virtually any wave shape that exceed  the combined threshold and hystersis levels (VT+VH)will trigger a comparator at a rate determined by the input frequency. The comparator output is then transmitted across a proprietary transformer-coupled isolation barrier and converted to a high-level analog signal. This signal is then filtered by a multi-pole low pass Butterworth filter and buffered to provide a low-noise, low-impedance output signalthat isaccurately proportional to input frequency.

Simple Setup and Versatile Choices Setting the threshold and hysteresis values is a simple matter of  externally wiring to the backplane screw terminals. The threshold for measuring a zero-crossing voltage waveform (such as sine waves) is set to 0 volts by connecting the input signal across screw-terminals 4and 3. The threshold for a positive level signal (such as a TTL or pulse train waveform) is set at +1.4V byconnecting the input signal across terminals 3 and 2. Hysteresis for both input signal types is set at +400 mV but can be changed to +25 mV by adding a jumper between screw terminals 1 and 4. Responsetime is a function of a modules rated input frequency range.(See the 5B45 and 5B46 Model Table).

The input circuit is fully floating and isolated from the outputand power commons. In addition, the output sectionacts as a third floating port towards eliminating possible problems from ground loops and power supply noise. The output commonmust be held within +3V of power common.

A series output switch eliminates the need for external multiplexing in many applications. The switch is turned on byan active-low enable input. If the switch is to be on at all times,the enable-input should be grounded to power common as it ison the 5B01 and 5B08 backplanes..

The 5B45 and 5B46 protect the computer side from field-side over-voltage faults. All models  withstand 240 V rms at their input terminals without damage, thereby shielding computerside
circuitry from field-side over-voltage conditions. In addition, all 5B45 and 5B46 models are mix-and match and hotswappable, so can be inserted or removed from any socket inthe same
backplane without disrupting system power.

Inside 5B45 & 5B46 Modules The 5B45/46 internal circuitry compares the input signal to the  user-selected threshold (VT)and hysteresis (VH). Signals of virtually any wave shape that exceed  the combined threshold and hystersis levels (VT+VH)will trigger a comparator at a rate determined by the input frequency. The comparator output of 5B45 and 5B46 is then transmitted across a proprietary transformer -coupled isolation barrier and converted to a high-level analog signal. This signal is then filtered by a  multi-pole low pass Butterworth filter and buffered to provide a low-noise, low-impedance output signal that isaccurately proportional to input frequency.

Simple Setup and Versatile Choices Setting the threshold and hysteresis values is a simple matter of  externally wiring to the backplane screw terminals. The threshold of 5B45 and 5B46 for measuring a zero-crossing voltage waveform (such as sine waves) is set to 0 volts by connecting the input signal across screw-terminals 4and 3. The threshold for a positive level signal (such as a TTL or pulse train waveform) is set at +1.4V byconnecting the input signal across terminals 3 and 2. Hysteresis of 5B45 and 5B46 for both input signal types is set at +400 mV but can be changed to +25 mV by adding a jumper between screw terminals 1 and 4. Response time is a function of a modules rated input frequency range.(See the 5B45 and 5B46 Model Table).

The input circuit of 5B45 and 5B46 is fully floating and isolated from the outputand power commons. In addition, the output section acts as a third floating port towards eliminating possible problems from ground loops and power supply noise.  The output of 5B45 and 5B46  common must be held within +3V of power common.

A series output switch of 5B45 and 5B46  eliminates the need for external multiplexing in many applications. The switch is turned on by an active-low enable input. If the switch of 5B45 and 5B46 is to be on at all times,the enable-input should be grounded to power  common as it ison the 5B01 and 5B08 backplanes..