7B41

Rev. 0 | Page 2 of 8

GENERAL DESCRIPTION

The 7B41 is a single-channel signal conditioning module that

interfaces, amplifies and filters unipolar and bipolar voltage

inputs and provides a protected precision output of either +1 V

to +5 V or 0 V to +10 V. Model 7B41 features a nonlinearity of

+0.02% maximum and an accuracy of +0.1% maximum

(+0.01% typical). To accurately measure low level signals in

electrically noisy environments, 1500 V rms of galvanic

transformer-based isolation with a common mode rejection

(CMR) of 110 dB @ 50/60 Hz and a normal mode rejection

(NMR) of 100 dB @ 50/60 are provided. Rated to operate with

nominal +24 VDC supply, Model 7B41 is mix-and-match and

hot-swappable with other 7B Series input modules, so it an be

inserted or removed from any socket in the same backplane

without disturbing system power.

The floating differential input of Model 7B41 is fully protected

up to 240 V rms line voltage. A one-pole 10 KHz filter

preconditions the input signal prior to amplification by a low

drift input amplifier. Amplitude modulation is used to

implement transformer isolation (1500 V rms input-to-output

and power). Isolated front-end circuitry power is supplied by a

DC/DC converter. The output section contains a four pole low

pass filter (-3 dB @ 10KHz), a buffer amplifier and a power

oscillator. The two-pole output filter and subsequent buffer

ensures that a low noise, low impedance (<1Ω) signal is

available at the output to drive loads of 2 kΩ minimum.

Figure 2