User`s guide

Measurements and Math Functions 6
InfiniiVision Oscilloscopes User’s Guide 205
The example below shows a phase measurement between the channel 1 and the math
d/dt function on channel 1.
Voltage Measurements
Measurement units for each input channel can be set to Volts or Amps using the channel
Probe Units softkey. A scale unit of U (undefined) will be displayed for math function 1-2
and for d/dt, and  dt when 1-2 or 1+2 is the selected source if channel 1 and channel 2
are set to dissimilar units in the channel Probe Units softkey.
Math Measurements and Units
Only Peak-Peak, Maximum, Minimum, Average, X at Min Y, and X at Max Y automatic
measurements may be made on a math FFT function. See “Making time measurements
automatically” for the FFT X at Max Y and X at Min Y measurement. Use the cursors to make other
measurements on FFT. All voltage measurements may be made on other math functions. The
resultant units are:
FFT:
1*2:
1–2:
d/dt:
 dt:
dB* (decibels)
V
2
, A
2
or W (Volt-Amp)
V (Volts) or A (Amps)
V/s or A/s (V/second A/second)
Vs or As (V-seconds or A-seconds)
* When the FFT source is channel 1, 2, 3, or 4, FFT units will be displayed in dBV when channel
units is set to Volts and channel impedance is set to 1 M
. FFT units will be displayed in dBm
when channel units is set to Volts and channel impedance is set to 50
. FFT units will be
displayed as dB for all other FFT sources or when a source channel’s units has been set to Amps.