Electrical specification
26
A daughterboard option provides the 1902 with a medical-
specification isolation pre-amplifier and associated isolated
power supply. This amplifier can be DC blocked, with a corner
frequency of 0.16 Hz. Any resistive electrode balancing
network is expected to be external to this unit.
Input impedance 10 GOhm
Input bias current at 25ºC ±150 pA
Noise referred to input, 0.3 µV rms.
1 Hz - 10 kHz
Common-mode rejection at 50 Hz 100 dB
Common-mode voltage range ±1 V
Input offset voltage, initial adjusted less than 10 µV after 1-hour
warmup
Input offset voltage vs. temperature 5.5 µV/ °C
Input offset voltage vs. time 1.5 µV / 1000 hrs
Gain ranges – Low-noise EEG ×1,000 - ×1,000,000
– ECG ×100 - ×100,000
Gain step sequence ×1, ×3, ×10…
Gain accuracy ±2%
Bandwidth, all gains DC - 10 kHz
Isolation voltage, continuous 1500 V DC
Isolation voltage, peak for 5 sec 2500 V peak
Input-output leakage at 240V, 50 Hz less than 20 µA
Input clamp option – Low-noise EEG 0.5 ms - 14 ms
Lead configuration – ECG I, II, III, aVR, aVL, aVF, and V
Calibrator – ECG 1 mV pulse
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