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图2 - 24示出静电计或皮安计的过载保护电路，其中包括一个电阻器和两个二极管(1n3595)。
Figure 2-24 shows a protection circuit for an electrometer ammeter or picoammeter, consisting of a resistor and two diodes (1n3595).
为了尽量降低噪声和泄漏电阻的影响，应当将电阻器放在一个屏蔽、保护的测试夹具中。
To minimize noise and leakage resistance, the resistor should be placed in a shielded, guarded test fixture.
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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