Tenma 72-14520 Instructions Manual page 27

FFT Window
Rectangle
Hanning
Hamming
Blackman
Set Vertical Unit
• Vertical units can be Vrms or dBVrms.
• Press F4 to select the desired unit. Vrms and dBVrms show the vertical amplitude
by means of logarithmic and linear.
• To display the FFT spectrum in a larger dynamic range, dBVrms can be used.
Functions Menu
Type
Operator
Signal source 1
Signal source 2
Reverse
• During operation, when the source channel voltage value is greater than the
corresponding channel trigger value, the logic decision will be 1, otherwise it is 0.
Waveform transform will be in binary operation. Four logical operations examples
are shown in the table below.
S1
0
0
1
1
Feature
The best frequency resolution,
the worst amplitude resolution.
Basically similar to a status
without adding window.
Frequency resolution is better
than the rectangle window but
amplitude resolution is poorer.
Frequency resolution is
marginally better than Hanning
window.
The best amplitude resolution
and the poorest frequency
resolution.
Setup
Logic
AND
OR
NOT
XOR
CH1 to CH4
CH1 to CH4
Open, Close
S2 AND
0 0
1 0
0 0
1 1
Most suitable measurement item
Temporary or fast pulse. Signal level is
generally the same before and after.
Equal sine wave of very similar frequency.
There is broad-band random noise with
slow moving wave spectrum.
Sine, cyclical and narrow-band random
Temporary or fast pulse. Signal level varies
greatly before and after.
Mainly for single frequency signals to
search for higher-order harmonic wave.
To carry out +, -, x, ÷ functions
Signal source 1AND Signal source 2
Signal source 1 OR Signal source 2
Signal source 1NOT Signal source 1
Signal source 1XOR Signal source 2
Set any one of the CH1~CH4 for logic as source 1
Set any one of the CH1~CH4 for logic as source 2
Reverse logic waveform
OR XOR
0 0
1 1
1 1
1 0
27
noise.
Notes
S1
0
1
NOT
1
0