I’m frustrated

6180A channel configuration

We are trying to configure a 6180A recorder channel to accept a 0-100mVDC input and display the output in torr. Specifically 100mV=1.0E-2 torr and 0mV=1.0E-12 torr (actually we only need down to 50mV=1.0E-7 torr at the low end). No matter how we try to configure it, we don't seem to be getting the right output (6180A displays 10-3 when we are in 10-6 range). We have verified the input voltage is correct at varying vacuum points.
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