| 摘要 |
A portable programmer is disclosed for programming and testing a multiple rate meter such as an electronic time-of-day meter system. The portable programmer includes a quartz crystal controlled seven-day clock. A time comparator is driven in synchronism with a signal which drives the clock in the time-of-day meter. When the time of the time comparator is equal to that of the programmer's timer, a compare signal is generated to switch the time in the meter to its standard time base. A programmable read-only memory in the portable programmer stores a plurality of different programs, each of which can be selectively read into the time-of-day meter. The output of the programmable read-only memory is read out and compared with the time generated by the time comparator. When a comparison exists an output is generated to a program comparator which compares the control output of the time-of-day meter with the control output signal from the portable programmer, and if a comparison exists an indication is given indicating that the program has been properly read into the time-of-day meter. A method of programming and testing a multiple rate metering system by using the portable programmer is also disclosed. |
