| 摘要 |
1,227,389. Selective signalling. VARIAN ASSOCIATES. 23 July, 1968 [21 Aug., 1967], No. 35184/68. Heading G4H. In an electrographic recorder in which electrodes 12 are selectively energized in accordance with the instantaneous valve of an input E,<SP>1</SP> to record a trace 14, additional electrodes 29, 31 are provided to record an indicium 35, 34 when the input lies outside the normal amplitude range which may be recorded on medium 13. The input is compared at 47 with a feedback signal derived from current generators 46 controlled by a binary coded decimal or ring counter 45 which receives pulses from clock generator 53 and count up/down signals from error decoder 49. A second input E;<SP>2</SP> may be similarly digitized at 6, the digital outputs being multiplexed in gates 9 and fed to decoder 11. The high/low off-scale indications from digitizing counters 45 control electrodes 31, 29 directly through OR gates 36, 37. |
