GW Instek GFG-8210A User Manual

Page 10

FUNCTION GENERATOR

USER MANUAL

14a

5-6.Variation of external voltage-controlled frequency

This mode of operation allows the user to adjust the frequency of the

function generator with an external DC control Voltage. It also provides

an easy way for your adjustment.

(1) Select Function

first, then select Range

, rotate FREQ

to set required frequency range.

(2) Connect external control voltage (0~10V) to the VCF

connector via a suitable lead, and generate signal from Output

(3) Other adjustments, such as AMPL

switch can change

amplitude of signal, or get attenuation; adjust Offset

for DC

level, rotate Duty k switch can change output signal of pulse or
ramp waveform etc..

5-7.Auto Sweep

(1) First select the required waveform by pressing Function

button,

then select required frequency range by pressing range

push

button.

(2) Connect output terminal

to oscilloscope for observing output

signal.

(3) Rotate frequency

to determine the upper limit frequency.

(4) Pull out frequency

to perform auto-sweep operation.

(5) Rotate SWEEP/TIME

and SWEEP/RATE to adjust

sweep time and rate.

(6) Pull out (press) LIN/LOG

to obtain LOG (LIN) sweep mode.

Note: The sweep width can only be adjusted during the sweep cycle

and it can not be stopped.

FUNCTION GENERATOR

USER MANUAL

5-8. 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 50 Ω , 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.