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ISO102在小信号测量应用中的误差分析
消耗积分:2 |
格式:rar |
大小:25 |
2009-06-02
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High accuracy measurements of low-level signals in the
presence of high isolation mode voltages can be difficult due
to the errors of the isolation amplifiers themselves.
This error analysis shows that when a low drift operational
amplifier is used to preamplify the low-level source signal,
a low cost, simple and accurate solution is possible.
In the circuit shown in Figure 1, a 50mV shunt is used to
measure the current in a 500VDC motor. The OPA27
amplifies the 50mV by 200X to 10V full scale. The output
of the OPA27 is fed to the input of the ISO102, which is a
unity-gain isolation amplifier. The 5kW and 1kW potentiometers
connected to the ISO102 are used to adjust the gain and
offset errors to zero as described in the ISO102 data sheet.
presence of high isolation mode voltages can be difficult due
to the errors of the isolation amplifiers themselves.
This error analysis shows that when a low drift operational
amplifier is used to preamplify the low-level source signal,
a low cost, simple and accurate solution is possible.
In the circuit shown in Figure 1, a 50mV shunt is used to
measure the current in a 500VDC motor. The OPA27
amplifies the 50mV by 200X to 10V full scale. The output
of the OPA27 is fed to the input of the ISO102, which is a
unity-gain isolation amplifier. The 5kW and 1kW potentiometers
connected to the ISO102 are used to adjust the gain and
offset errors to zero as described in the ISO102 data sheet.
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