Date: Sun, 11 Apr 2021 09:28:09 +0000 (UTC) Message-ID: <432327983.59732.1618133289878@[172.30.0.220]> Subject: Exported From Confluence MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_Part_59731_1676127473.1618133289850" ------=_Part_59731_1676127473.1618133289850 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Content-Location: file:///C:/exported.html Why Don't Output Equation Units Match Corresponding Measurem= ents

# Why Don't Output Equation Units Match Corresponding Measurement= s

### 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.

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