### Problem

When I add measurements to a graph, they follow the global units; e.g. m=
A, mW, dBm, etc. When I use Output Equations, however, the measurements com=
e out in base units; e.g. Amps, Watts, dBW, etc., regardless of the global =
units. Why is this?

### Solution

Measurements in the Output Equations window are always evaluated in base=
units. This is done in order to make the rest of the equations in the wind=
ow independent of the global or LPF units.

As an example, consider using the Output Equations window to calculate p=
ower by multiplying Voltage and Current. Let's assume the voltage of intere=
st is 1 Volt and the current of interest is 1 Ampere for a total of 1 Watt.=
In the Output Equations, the equation for voltage will always return 1 V a=
nd the equation for current will always return 1 Ampere. So regardless of w=
hat the project units are for Voltage and Current, this equation for power =
will always return the same number. Consider what would happen if the Outpu=
t Equations did scale these numbers by the project units. Starting with bas=
e units so that no modifier is used for V and A, this would give us the sam=
e answer as above, 1 Watt.

Now, if the voltage modifier is changed to ** **` mV `

, the voltage variable would return 1000 mV and the power calculati=
on value would be 1000. This number has changed by a factor of 1000 simply =
by changing the setting for project units. Now, the units for this new powe=
r number is mW. The Output Equations do not know what the unit type is for =
the result of the equation. The potential issue is that the equation would =
not be able to scale itself back to Watts.

**
****Note**: If using Output Equations, which return values in=
base units, and comparing the values to graphical data, which use global o=
r LPF units, you may need to apply a conversion factor. For instance, you w=
ill need to add 30 to your values in Output Equations in dBw in order to ma=
tch your graphical values measured in dBm.