| 摘要 |
FIELD: instrumentation.SUBSTANCE: measurement converter of pressure difference comprises two capacitance pressure sensors, two self-contained generator with external start, two counters, a start-up generator, a sign shaper and a module shaper. Time-setting circuits of self-contained generators are connected to capacitance pressure sensors, outlets of self-contained generators are connected to count inlets of counters. Outlets of counters are connected to inlets of the sign shaper and the module shaper. The outlet of the start generator is connected to control inlets of self-contained generators, with inlets of counters zero setting and sign shaper. The outlet signal of the module shaper represents a pulse, duration of which characterises pressure difference. The outlet signal of the sign shaper takes the value "1" or "0" depending on the higher pressure.EFFECT: increased accuracy of conversion in area of small pressure differences.3 cl, 4 dwg |
