GW Instek GSP-810 User Manual - Manual (Page 26)

GSP-810 User Manual
24
DEMOD (Optional)
The GSP-810 can be optionally configured to perform FM and AM demodulation.
To access this feature, press the SHIFT DEMOD key. The bottom half of the LCD
display will show the current demodulation selection that can be changed with the
SPINNER. Demodulation can only be performed in Zero-Span mode. When in
Zero Span the demodulation audio will be routed to the speaker. When a
demodulation mode is selected, the span will automatically switch to Zero Span (if
it was not already in Zero Span). There are default RBWs associated with the
various demodulation modes. For FM-Wide, FM-Medium, and FM-Narrow, the
default RBW is 220 kHz, the RBW may be changed between 220 kHz and 4 MHz.
For AM demodulation, the default RBW is 30 kHz, the RBW may be changed
between 3 kHz, 30 kHz, 220 kHz, and 4 MHz. The default RBW is restored each
time SHIFT DEMOD is pressed.
CENTER
SPAN
REF LVL
RBW
7 8
.
6
SHIFT
PK->MKR
MKR->CF
SETUP
TRACE
MKR
MKR
E
N
T
E
R
MHz
dBm 4 5
2 1
0
3
9
-
SPAN
CENTER
REF LVL
DEMOD
MEM
TRK GEN
RBW
PWR MTR .
500.000MHz 20 dBm
100MHz/div 4 MHz
DEMOD TYPE:OFF
500.000MHz 20 dBm
100MHz/div 4 MHz
DEMOD TYPE:OFF