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1·在测试样板和7158型开关卡之间应该使用低噪声同轴电缆，以避免噪声电流。
Low noise coax cables should be used between the test coupons and the Model 7158 CARDS to avoid noise currents.
2·第二组开关(7158型)在经过合适的平稳时间后将每个电容器连接到皮安计。
A second set of switches (on the Model 7158) connects each capacitor to the pico ammeter after a suitable soak period.
3·注意，当7158型开关卡上没有通道被激励时，端子2和4是被连接到皮安计（pA）的LO端子的，它在电气上为保护端子。
Note that when none of the channels on the Model 7158 card are energized, terminals 2 and 4 are connected to the LO of the picoammeter (pA), which electrically is the guard terminal.