GE MAC 1200 Servicing Instructions page 70

GE Medical Systems MAC 1200 V 1.2 Page 68
Information Technologies 227 492 21 Rev F
Pin assignment of data port
2RXDE
3 TXDE
5 circuit reference
6 Modem Supply
8 Remote Start Input
Remote Start (hardware)
Paper feed via remote control connection (depending on selected operating mode). External make
contact referred to chassis via circuit reference:
» source impedance Ri < 300 Q
+ contact dwell > 100 ms
e non-destructive load +10V
e ESD interface protection up to + 10kV
Signal Transmission
Patient input to recording
After lead formation and digitization, simultaneous transmission of all electrode signals to the digital
processing system; muscle filter, AC filter, pacing pulse identification, automatic or manual
sensitivity adjustment, automatic baseline adjustment and drift compensation by means of the anti-
drift system (A.D.S.) can be enabled or disabied simultaneously for all channels; digital output of
processed signals via thermal-array printhead.
e low cut-off frequency (-3 db limits) 0.08 Hz, equivalent to a time constant of 2.04 s
e high cut-off frequency (3 dB limits) operating mode: 12 Lead, 6 Lead 150 Hz (IEC/AHA)
operating mode: Arrhy 100 Hz (IEC)
e signal sampling rate: 1000/s
© resolution, referred to the input 5 uV
© output rate to recorder 2000/s