DCV Ratio The DCV Ratio key enables or disables DCV Ratio measurement. Note that the Auto Zero soft key will disappear when DCV proportional measurement is enabled. This is because Auto Zero cannot be disabled during DCV Ratio. This ratio is the ratio of the voltage at the input terminal to the reference voltage. The reference voltage is the difference between two separate measurements. These measurements are the DC voltage from the HI sensing terminal to the LO input terminal and from the LO sensing terminal to the LO input terminal. Both measurements must be within the ± 12 VDC range.
The reference voltage is always automatically adjusted, and the range used for both measurements is based on the larger result of the two measurements. Configure DCV Ratio measurements, as shown below: 27