Electrical specification
25
The main amplifier comprises a programmable-gain amplifier, a
selectable mains notch filter, a programmable selection of low-
pass and high-pass filters (analogue or digital), and
programmable selection of input sources. The output of the
amplifier is through a standard coaxial BNC socket.
Bandwidth (with analogue filters) DC to 50 kHz (-3dB) in DC mode
0.16 Hz to 50 kHz in AC mode
Bandwidth for gains over ×3000 25 kHz (-3dB)
Bandwidth (with digital filters) DC to 10 kHz (-3dB)
Gain accuracy ±2%
Digital filter response Bessel or Butterworth
Filter slope (low- and high-pass) 2
nd
or 3
rd
Low-pass filter corner frequency 1 Hz - 10 kHz cont. variable
order (12 or 18 dB/octave)
High-pass filter corner frequency 0.01 Hz - 1 kHz cont. variable
Rectification User-selectable
Filter latency 0.35 ms (approx.)
Mains notch cut (50 Hz or 60 Hz) 50 dB (typical)
Overload indicator 2 yellow LEDs (1 for each polarity)
indicate when input is overrange
Transducer input:
Input impedance 1 GOhm
Input bias current ±50 nA max
Range of gains available ×1 to ×100,000 in steps of 1, 3, 10…
Common mode range ±10 V
CMRR >100 dB
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