Key features
• Three-channel DC differential
voltage amplifier
• Programmable excitation
voltage
• 200 kHz bandwidth (-3dB
corner)
• Independent selectable
filters for each channel
• Zero function
• Gain range from 0.00 to
999.9
Description
The model 126 is a microprocessor-controlled, 3-channel DC signal conditioner amplifier designed
to be used with bridge type or differential output accelerometers and pressure transducers.
The model 126 incorporates variable gain adjustment, shunt calibration capability, and multiple
excitation level settings.
A microprocessor SLEEP mode is employed to eliminate high frequency clock noise and their
associated harmonics. This allows the amplifiers to operate with minimum self generated noise and
provides clean, clock free amplified signals.
The model 126 uses dual 12-bit DAC’s, for each channel, to auto zero the input and output
amplifiers for DC input signals. Input signals with magnitudes of ±10 Vdc can be zeroed. A unique
output DAC trimming routine allows trimming the output zero to within ±1 mVdc.
The transducer excitation supplies are individually adjustable for each channel from 0.00 to 12.00
Vdc. Any setting above 12.00 Vdc will generate an excitation voltage of 12.10 Vdc. The outputs
are short circuit protected and can supply up to 30 mA each. Remote sense leads are provided to
eliminate errors caused by long cable lengths.