Stanford Research Systems DS360 Operating Manual And Programming Reference page 51

Operation 3-17
Center Frequency
The center frequency can vary from 0 Hz to 200.000 kHz in 200 Hz increments. To
display the current center frequency, press the [CENTER] key. To change the center
frequency, type a new value using the numeric keypad, followed by the appropriate units
(Hz or kHz). If an out of range frequency is entered, the DS360 will beep, display " F req
Err " and flash the ERR LED.
For bandwidth limited noise with high center frequencies and/or wide bandwidths there
can potentially be a reduction in noise power. When
CENTER FREQUENCY + 1/2 BANDWIDTH > 200 kHz
the amplitude will be slightly reduced. This is due to the fact that the white noise
generator has a bandwidth of 200 kHz, so any part of the noise bandwidth above 200 kHz
will be filtered.
DS360 Ultra Low Distortion Function Generator