5B39

Converts a High-level analog input voltage into a floating proportional output current.

Output current of 4 to 20 mA or 0 to 20 mA across loads from 0Ω to 750Ω.

High Accuracy of +0.05%, Low nonlinearity of +0.02%. Module circuitry can withstand 240v rms at the input screwterminals.

All 5B39 series modules are mix-and-match and Hot Swappable.

Swappable.

Industrial signal conditioning

Industrial signal isolation

Industrial signal filtering

The 5B39 is a single-channel signal conditioning module that converts a high-level analog input voltage into a floating, isolated proportional output current of 4 to 20 mA or 0 to 20 mA across loads from 0Ω to 750Ω. The 5B39  provides high accuracy of +0.05%, low nonlinearity of +0.02%, and the protection of 1500V rms isolation between output-to-input and output-to power supply. The input common of 5B39 must be held towithin +1V of power common.

Signal isolation by transformer coupling uses a proprietarymodulation technique for linear, stable and reliable performance. A demodulator on the output side of the signal transformer recovers the original signal, which is then filtered and converted to an accurate current output by a current (V-to-I) converter output stage. Output protection enables the 5B39 to withstand accidental connection to 240V rms power lines without damage, while isolating computer-side circuitry. In addition, the 5B39 is mix-and-match and hot-swappable with all 5B Series modules, so can be inserted or removed from anysocket in the same backplane without disrupting system power.

Track-and-Hold for DAC Applications In applications wherea single system digital-to-analog converter (DAC) is used todrive a number of current output channels, the 5B39 includes a track-and-hold input circuit. Selected by a high Write Enable input, the hold mode exhibits an output droop rate of 80 uA/s. This corresponds to a refresh interval of 25 ms for 0.01% span droop. On power-up, the module's output remains at 0 mA for about 100 ms to allow the user to initialize the track-and-hold circuit.

In applications using one DAC per channel, where the trackand-hold feature of the 5B39 is not used, the Write Enable inputshould be set to low by grounding it to power common, as onthe 5B01 and 5B08 backplanes. The 5B39 current output willthen track its input signal.

Generating A Voltage Output Signal The 0 to 20 mA output of the 5B39-04 and the 5B39-03, can produce a 0 to +10V output by connecting a 500Ω conversion resistor across the modules' output terminals,. This approach of 5B39 should be used with caution because the output lacks the low impedance of a true voltage source. This means that the tolerance and size of the load impedance relative to the conversion resistor can introduce significant error. For example, a load impedance < 500kΩ would contribute <0.1% error.