| 摘要 |
<p>PURPOSE:To contrive trimming having good reproducibility by holding probes in a state of being separated from a resistor during operation of a changeover means so as to prevent a noise at an operation time of the changeover means from entering the resistor. CONSTITUTION:In a resistor trimming device holding in common probes 6 for measuring resistance value of a resistor and for impressing pulse voltage and wherein the probes 6 are connected to a means 16 of measuring resistance value as well as to a means 13 of impressing pulse voltage through a changeover means 17, the probes 6 are held in a state of being separated from the resistor during operation of aforesaid changeover means 17 so as to prevent a noise during an operation time of the changeover means 17 from entering the resistor. For instance, each resistance value of a heating resistor of a thermal head 1 is measured and the resistance value is memorized for a time so as to set up pulse voltage basing on the measured value. Next, the tip parts of the probes 6 are held in the state of being separated from the surfaces of the electrodes of the thermal head 1 and a selector 17 is again operated so as to connect the probes 6 to a pulse voltage impressing device 13.</p> |
