| 摘要 |
FIELD: agricultural engineering. ^ SUBSTANCE: apparatus has analog depth sensor whose output is connected to non-inverting input of differential amplifier, with inverting input of amplifier being connected to reference voltage source and output of amplifier being connected to input of ripple filter, two light-emitting diode indicators provided with current limiting resistors and connected in series between power bus and common bus, two-threshold comparator whose signal input is connected to output of ripple filter while setting inputs of comparator are connected to reference voltage source, and output of comparator is connected to one input of coincidence circuit whose output is connected to first input of computer. Apparatus is further provided with saw-voltage generator, comparator whose non-inverting input is connected to output of saw-voltage generator and inverting input is connected to output of ripple filter. Input of this comparator is switched to single point of light-emitting diode indicators. Advancement distance pulsed sensor has output connected to other input of coincidence circuit and to second input of computer. ^ EFFECT: simplified construction, enhanced reliability in operation and convenient operation of apparatus. ^ 2 dwg |
