Measurements and Math Functions 5
InfiniiVision 7000B Series Oscilloscopes User’s Guide 169
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.
The following figure shows the voltage measurement points.
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 —
dB* (decibels)
• 1*2 — V
2
, A
2
or W (Volt-Amp)
• 1–2 — V (Volts) or A (Amps)
• d/dt — V/s or A/s (V/second A/second)
• dt — 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.
Maximum
Minimum
Peak-Peak
Amplitude
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