| 摘要 |
PURPOSE: To obtain an electronic watthour meter with error test mode function in which error test can be carried out efficiently and economically without requiring any line for exclusive use. CONSTITUTION: A reference pulse being transmitted on a lighting line 91 is taken in from a master meter 6 through a lighting line carrying section 24. The reference pulse is then converted at a central processing section 25 with a metric pulse obtained from a power/frequency converting section 22 to determine the difference which is displayed at a display section 26. |
