Using Custom Units
Measurement Example
Figure 1-37; Power Measurement Example
Suppose, you want to measure the electrical power consumption in
a device under test (BUT), as shown in Figure 1-37.
A power measurement is defined by the formula;
P = VI * Id
where Vl is in Volts, Id is in Ampere, and P is in Watts.
The oscilloscope has voltage measurement inputs, so the current (Id)
needs to be converted to a voltage signal. The custom unit calcula
tion formulas can be used to compensate the current to voltage con
version.
You can use a Tektronix Current Probe in this application, for exam
ple a P6021 with a current probe amplifier (Tektronix type 134), to
measure the current (Id) through the BUT,
Using a P6021, the output sensitivity of the current probe amplifier
(Tektronix Current Probe Amplifier typel34) is 50 mV/DIV.
If the input sensitivity of the current amplifier is set to 10 mA/DIV,
Id can be calculated as:
Id = (10 xlO ”3 / 50 xlO " 3 ) x VCH2 (in Volts)
2216 User Manual
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