电话静音开或关 phone mute on or off
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若要测量开关卡的偏移电流，请将卡的输出连接到一台皮安计或静电计。
To measure the offset of a switch card, connect the output of the card to a pico ammeter or electrometer.
将一个静电计连接到开关卡输出并测量电流。
Connect an electrometer to the switch card output and measure the cur rent.
电阻器（RL）是电流限制电阻器，用来保护开关和静电计不受大电流的损害。
The resistors (RL) are current limiting resistors used to protect the switches and electrometer from high current.
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