在理想的情况下，当把电压表连接到一个没有电压的、阻抗比较低的电路时，电压表的读数应当为零。
Ideally, when a voltmeter is connected to a relatively low impedance circuit in which no voltages are present, it should read zero.
因此，不使信号源和测量仪器之间的连接电路影响测量读数是非常重要的。
Therefore, it is important that the connection between the signal source and the measuring instrument doesn't interfere with the reading.
注意，电路中的电流必须通过电流表以测量到读数。
Note that the current must flow through the ammeter in order to reach the circuit.
用读数保持电路记录压力变化，较直接读取刻度值更加准确，可靠。
More precise and reliable recording is achieved by reading-keeping circuit compared with the original gauge-reading.
用读数保持电路记录压力变化，较直接读取刻度值更加准确，可靠。
More precise and reliable recording is achieved by reading-keeping circuit compared with the original gauge-reading.
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