Agilent Technologies 54621A, User Manual, Page: 217 / 276

5-47
Making Measurements
Making voltage measurements automatically
Making voltage measurements automatically
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, and X at Max automatic
measurements may be made on a math FFT function. See “Making time
measurements automatically” for the FFT X at Max and X at Min 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 or channel 2 (or channel 3 or 4 on the 54624A), FFT units
will be displayed in dBV when channel units is set to Volts and channel impedance is set to
1 M
Ω
. FFT units will be displayed in dBm when channel units is set to Volts and channel
impedance is set to 50
Ω
(54640-series only). 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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Base