GW Instek GFG-8200A Series User Manual

Page 12

FUNCTION GENERATOR-SERIES

INSTRUCTION MANUAL

5-8.AM/FM operation

(1) Select function

first; then select Range

, rotate FREQ

to set

required frequency range.

(2) Connect output terminal

to oscilloscope for observing output

signal.

(3) Press MOD

and pull out (press) MOD

to obtain FM/AM

modulation mode.

(4) Adjust MOD

to achieve required modulation ratio.

5-9. Precaution item

(1) Adjust DC OFFSET, will provide to change voltage of ±10V (no load)

or ±5V (50Ω load). However, signal added DC level, is still

limited to ±20V (no load) or ± 10V (50Ω load). In case of over-

voltage, clip will appear as shown in Figure 2:

(2) Output connector label 50Ω, indicated that signal source impedance is

50Ω. Connect to any of impedance circuit, but output voltage and

terminal impedance will be rated. To avoid oscillation, terminal shall

be connected to 50Ω (When using high frequency and square output),

and its connecting line shall be as short as possible.

(3) When adjust Duty knob to leftward position, the ratio of positive state

to negative state, expand to not less than 80:20. It can expand Square

wave to Pulse wave, expand Triangle wave to Ramp wave and Sine

wave to unsymmetrical Sine wave. As shown in Figure 3 is for

adjustment of Duty control to obtain required waveform.

FUNCTION GENERATOR-SERIES

INSTRUCTION MANUAL

z Figure 2.

z Figure 3.