Set this constant to a non-zero value to enable diagnostic messages to be printed or set it to zero to suppress them.
将这个常量设置为非零值，以便显示诊断消息；或者将其设置为零，以便抑制诊断消息。
2
Just before the voltage source is turned on, disable the meter's zero check and suppress the charge reading by using the REL function to zero the display.
在电压源即将打开之前，关闭仪器的零点检查功能并使用REL功能抑制电荷读数，使显示为零。
3
Moreover, three-phase four-wire active filters can suppresszero line current, and solve symmetric problem of system effectively.