Iwatsu DS-8814, Operation Manual

Page: 124 / 141

F-11
Cursor Measurement of the FFT Waveform
The FFT waveform displayed in the FFT screen can be measured with the cursor.
For the method of cursor operation, please refer to page 22.
∆
V/
∆
t/
∆
V&
∆
t
/
∆
V at t/OFF
While the FFT screen is being displayed, the type of cursor measurement
changes sequentially each time the button is pressed.
∆
dBm
→∆
f
→∆
dBm&/
∆
f
→
dBm at f
→
OFF
The cursor measurement item and measurement result are displayed in the
menu display area.
Types of Cursor Measurement
Type of measurement Description Operable cursor
∆
dBm
∆
dBm between dBm of V-C1 and V cursor V-C1, V-C2
∆
f
∆
f between frequency of H-C1 and H cursor H-C1, H-C2
∆
dBm/
∆
f
∆
dBm between dBm of V-C1 and V cursor
∆
f between frequency of H-C1 and H cursor
V-C1, V-C2
H-C1, H-C2
dBm at f dBm at point of intersection between H-C1
frequency waveform and cursor
H-C1
OFF Cursor measurement not performed None
∆∆∆∆
dBm/
∆∆∆∆
f Measurement
The below diagram is an example in which the
∆
dBm and
∆
f between the main component
(A) and secondary harmonic component (B) are measured from the FFT results of a 100kHz
sine wave. (Refer to page 23.)
→
Currently selected measurement item
→
Cursor that can be operated with
FUNCTION knob
→
dBm value of V-C1
→ ∆
dBm value between V cursor
→
Frequency of H-C1
→ ∆
f value between H cursor
A
B