GW Instek GDS-1062A - Math Operations; Overview; Adding, Subtracting or Multiplying Signals

MEASUREMENT
55
Math Operations
The Math operations can add, subtract, multiply or perform
FFT/FFT RMS on the input waveforms. The resulted waveform can
be measured using the cursors, and saved or recalled just like
normal input signals.
Overview
Addition (+)
Adds the amplitude of CH1 & CH2 signals.
Subtraction (–)
Extracts the amplitude difference between CH1 &
CH2.
Multiplication (×)
Multiplies CH1 and CH2.
FFT
Performs a FFT calculation on a signal. Four types
of FFT windows are available: Hanning, Flattop,
Rectangular, and Blackman.
FFT RMS
Performs a FFT RMS calculation on a signal. RMS
is similar to FFT, however the amplitude is
calculated as RMS and not dB. Four types of FFT
windows are available: Hanning, Flattop,
Rectangular, and Blackman.
Hanning FFT
window
Frequency resolution
Good
Amplitude resolution
Not good
Suitable for....
Frequency measurement on
periodic waveforms
Flattop FFT
window
Frequency resolution
Not good
Amplitude resolution
Good
Suitable for....
Amplitude measurement on
periodic waveforms
Rectangular FFT
window
Frequency resolution
Very good
Amplitude resolution
Bad
GDS-1000A Series User Manual
56
Suitable for....
Single-shot phenomenon
(this mode is the same as
having no window at all)
Blackman FFT
window
Frequency resolution
Bad
Amplitude resolution
Very good
Suitable for....
Amplitude measurement on
periodic waveforms
Adding, subtracting or multiplying signals
Procedure
1. Activate both CH1 and
CH2.
CH 1 CH 2
2. Press the Math key.
M
A
T
H
3. Press Operation repeatedly
to select addition (+),
subtraction (–) or
multiplication (×).
4. The math measurement
result appears in the
display.
5. To move the math result
vertically, use the Variable
knob. The position will be
displayed in Posistion.
VARIABL
E
6. To clear the math result
from the display, press the
Math key again.
M
A
T
H