Analysis of Instrumentation UPS Architecture

The phenomenon of maintenance failure of the brain topographer and the treatment of a brain topographer in the hospital had irregular irregularities. Interference failures occur from time to time, but when there is no regularity, they can be restarted after interference occurs. The interference phenomenon can be eliminated temporarily, and the leads generated by interference are not fixed.

It has been suspected that there is a problem with the electrode wire or amplifier. After repeated replacement tests, the failure cannot be eliminated. Checking the grounding cable also found no detachment or poor contact. Later, the manufacturer simply replaced one host, but the failure still existed. Later, the power supply environment of the aircraft was analyzed. Since the aircraft is composed of a host (amplifier) ​​and a microcomputer, there is a UPS power supply circuit on the power supply circuit. It is doubted whether it is related to UPS power supply. The UPS power supply is removed, and the power supply is directly from the power grid. Troubleshooting It has been one year since then and this failure has not occurred again.

Bedside monitoring station fault repair fault phenomenon and processing A 4 bed wired bedside monitoring workstation, 1 bed often suffers ECG waveform interference and heart rate interference failure, irregularity of the failure, sometimes serious ECG waveform interference, and sometimes ECG waveform Normal, but sometimes there is no or too much error in the heart rate, other beds do not have this failure. At first, it was suspected that there was a problem with the bed amplifier or connection line, and the replacement test was performed. At that time, the fault was eliminated, but the same phenomenon appeared again in the bed soon afterwards. After being verified, it was caused by a poor grounding caused by corrosion of the joint of the ground wire of the aircraft. After the joint is re-welded, troubleshooting.

Summary: Instrument World Network pointed out that the maintenance of instrument soft faults, due to the intermittent and irregularities of instrument failures, brings great difficulties to maintenance work. At this time, full consideration should be given to the possible occurrence of failures, and in particular not to miss them. Host-related auxiliary devices, even phenomenal peripheral devices or environmental influences that are not related to faults. Must not be bound by the momentary phenomenon of the phenomenon of failure, or just rely on maintenance experience to replace components, so as to avoid detours, time-consuming and laborious.