BNC 645 - Manual (Page 22)

22
Front-panel Operation
1. Select your desired function by pressing one of the function keys.
2. Press the softkey under Freq/Perd and make sure Freq is
highlighted (indicating the frequency mode is selected).
3. Use the numeric keypad or the knob with cursor keys to change
the value.
Remote Interface Operation
FREQuency {<frequency>|MINimum|MAXImum}
Notes
• Each waveform function has its own frequency range, but the
default frequency is 1 kHz for all functions. The table below lists
the frequency ranges for different functions:
Function Frequency Range
Sine 1 μHz ~ 50 MHz
Square 1 μHz ~ 25 MHz
Ramp 1 μHz ~ 200 kHz
Pulse 500 μHz ~ 10 MHz
Arbitrary 1 μHz ~ 10 MHz
• Frequency limitation: When you choose a new function and the
current frequency setting is larger than the maximum frequency
of the new function, the waveform generator will automatically
adjust the frequency to the smaller maximum value.
• Burst limitation: For internally-triggered bursts, the minimum
frequency is 2.001 mHz. For sine and square waveforms,
frequencies above 10 MHz are allowed only with an “infinite” burst
count.
• Duty Cycle Limitation: There are some limits on duty cycle for
square waveforms. When the frequency is greater than 10 MHz,
the range of the duty cycle is 40% to 60%. For other frequencies,
the range of the duty cycle is 20% to 80%. If you set an
out-of-limit duty cycle, the waveform generator will adjust