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ignored. The actual interval time may have a big difference with the preset interval time.
Select “Interval” option by the corresponding soft key, the interval time changes to yellow. Input a new interval
time here by numeric keypad or rotary dial. Press the soft key corresponding to the time units to confirm the new
data input.
3.4.5 Manual Sweep
After the “CHA Sw Fr” mode is selected, the sweep mode is default as manual mode. Select “Manual Sw” option
by the corresponding soft key, the sweep process stops at once. The output signal will keep at the stop state
without any changes. The current frequency value is shown on the TFT display. After the sweep process stops,
press key [CHA Output] once, the sweep process goes on by one step. According to the desired sweep mode, the
frequency of Channel A increases or decreases by one sweep step value. In this way, users can observe the
detailed variations in the frequency sweep.
3.4.6 Auto Sweep
Select “Auto Sweep” option by the corresponding soft key. This operation ceases the manual sweep and starts
auto sweep. Users can have dynamic monitor of the sweep process. Frequency of channel A changes
simultaneously according to the sweep process. The refreshed frequency values are displays on the TFT. In auto
sweep mode, setting up other parameters will stop the current sweep process.
3.5 Amplitude Sweep
Press key [Sweep] to select “CHA Sw A” option. The function generator outputs the sweep signal on CHA
Output. All operations of sweep parameter, sweep mode, single sweep, and sweep monitor apply the same
operation procedures as explained in section Channel A frequency sweep. To have continuous amplitude
variations, user shall firstly set attenuation of channel A. In the sweep process, the generator attenuates according
to channel A fixed attenuation, so as to avoid frequent relay switch during auto attenuation.
3.6 Frequency Modulation (FM)
Press key [MOD] to select “CHA FM” option. The function generator outputs the frequency modulation signal on
the CHA Output.
3.6.1 Set the Carrier Frequency
Select “Carrier Freq” option by the corresponding soft key. The carrier frequency changes to yellow. A new
carrier frequency data can be input here by numeric keypad or rotary dial. Press the soft key corresponding to the
frequency units to confirm the new data input. In the frequency modulation mode, the signal of Channel A is used
as the carrier signal and the carrier frequency is the frequency of Channel A. In this mode, the clock signals of
DDS synthesizer are switched from the fixed reference clock to the programmable reference clock, the accuracy
and stability of the carrier frequency may decrease.
3.6.2 Set the Modulation Frequency
Select “Mod Freq” option by the corresponding soft key. The modulation frequency value changes to yellow. A
new modulation frequency data can be input here by numeric keypad or rotary dial. Press the soft key
corresponding to the frequency units to confirm the new data input. In the frequency modulation mode, the signal
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