PSM1700 PsimetriQ user manual
1-4
1.2 Voltage inputs
Each input consists of a high impedance buffer followed by
switch to select ac or ac+dc coupling, then a series of gain
stages leading to an A/D converter. Selection of the input
gain and the sampling of the A/D converter are under the
control of the DSP. There is an autozero switch at the front
end for dc accuracy.
Both input channels are fully differential with very good
CMRR. This allows measurements to be made directly
across points in a circuit without shorting to earth. It also
prevents problems with ground loops in sensitive circuits.
The maximum input is 100V peak (50V rms).
The full scale of the lowest range is 10mV peak.
The input frequency range is dc to 1 MHz.
The A/D converter resolution is 12 bit.
The A/D sample rate is variable to 500k samples/s.
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