3B42 / 3B43 / 3B44
GENERAL DESCRIPTION
programmable 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 user-
supplied 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.
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 sine-
wave 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 input-
to-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.
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.
3B Series Custom-Ranging Program – Externally-
.
.
Figure 2
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