GW Instek SFG-2000 Series - Manual (Page 20)

FREQUENCY MODULATION
39
When the deviation is added to the center frequency, the
result must be smaller than the rating frequency.
Center Frequency + Deviation ≤
Rating(4,7,10,20MHz)
When this rule is violated, the “Freq-Err3” error
message appears and the FM setting will be cancelled.
For more error message details, see page52.
Center frequency (=Output frequency) must be set
within this range.
SFG-2104 300kHz ~ 3.7MHz
SFG-2107 300kHz ~ 6.7MHz
SFG-2110 300kHz ~ 9.7MHz
SFG-2120 300kHz ~ 19.7MHz
SFG-2000 series uses an internal
400Hz sine wave as the default
modulating signal.
1. Connect the modulating signal to
the rear panel terminal.
2. Press the Shift key, then 0 (EXT
MOD). External modulation is
activated.
0
EXT
Use external
modulating
signal
Frequency
Range 1kHz (fixed)
SFG-2000 Series User Manual
40
C
OUNTER INPUT
Counter input applies only to SFG-2100 series.
1. Connect the signal input to the Counter input
terminal. Press Shift key, then 1 (Counter).
1
2. EXT and COUNT sign appear on the display.
EXT
Activate
counter
COUNTER
INPUT
3. The display shows the input signal frequency.
EXT
4. The GATE sign flashes when the gate condition is
met.
Range 0 ~ 150MHz
Resolution 100nHz for 1Hz input,
0.1Hz for 100MHz input
Set the gate
time
Gate time sets the display update rate and counter
resolution. These two parameters are in trade-off.
Short gate time = faster update, coarse resolution
Long gate time = slower update, fine resolution
To change the gate time, turn the
editing knob right (increase) or left
(decrease).