3B42

The 3B42, 3B43, and 3B44 are single-channel AC sine wave signal conditioning modules which use an AC averaging technique to rectify, amplify, and filter 50 Hz to 400 Hz sinewave signals ranging from 20 mV to 550 V rms to give an rms output reading. Simultaneous precision voltage and current outputs are provided including isolation (+1500 V peak inputto-output and power). The 3B42 and 3B43 modules withstand 220 V rms, and Model 3B44 withstands 550 V rms at its input terminals without damage, thereby shielding computer-side circuitry from field-side over-voltage conditions. Each plug-in,mix-and-match, hot-swappable module is easily field calibrated via front-panel zero and span adjustments for both voltage and current outputs.

3B Series Custom-Ranging Program Externallyprogrammable versions, Models 3B42-00, 3B43-00, and 3B44-00, enable the user to configure a special input range by using the optional plug-on AC1310 ranging card, which houses usersupplied resistors to determine zero and span. To facilitate selecting resistors, a Windows program, 3B-CUSTOM,
calculates resistor values based on the user-desired input/output ranges.

Signal isolation by transformer coupling uses a proprietary modulation technique for linear, stable and reliable performance. The differential input circuit on the field side is fully floating, eliminating the need for any input grounding. A demodulator on the computer side of the signal transformer recovers the original signal, which is then filtered and buffered to provide a low-noise, low-impedance output signal.