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2-10
Function Setting
function, an error message will be displayed and the frequency will be set to
the maximum allowed for that function.
Ramps
Ramp functions usually ramp up in voltage, downward ramps may be set
entering a negative amplitude (see AMPLITUDE section).
FREQUENCY
To display the DS335's output frequency press the [FREQ]. The frequency
units can be Hz, kHz, or MHz, and are indicated by the LEDs on the right of
the display. The DS335 has 1 µHz frequency resolution at all frequencies,
for all functions. The maximum frequency depends on the function selected
as shown below.
Function
Frequency Range
Sine
Square
Triangle
Ramp
Noise
1 µHz → 3.100000000000 MHz
1 µHz → 3.100000000000 MHz
1 µHz → 10,000.000000 Hz
1 µHz → 10,000.000000 Hz
3.5 MHz White Noise (fixed)
Frequency is usually displayed by the DS335 with the highest resolution
possible. However, if the frequency is below 100 Hz, the DS335 will display
the frequency with 1 µHz resolution. At frequencies greater than 1 MHz the
digits below 0.1 Hz cannot be displayed, but the frequency still has 1 µHz
resolution and may be set via the computer interfaces.
If the function is set to NOISE the character of the noise is fixed with a band
limit of 3.5 MHz. The frequency is not adjustable and the FREQ display will
read "noise" instead of a numerical value.
Setting the Frequency
To set the frequency of any function simply type a new value on the keypad
and complete the entry with the appropriate units (Hz, kHz, or MHz). Also,
the UP and DOWN arrow keys may be used to increment or decrement the
frequency by adding or subtracting one from the flashing digit.
AMPLITUDE
Press [AMPL] to display the amplitude of the output function. The amplitude
may be set and displayed in units of Vpp and Vrms. The current units are
indicated by the LEDs at the right of the display. The amplitude range is
limited by the DC offset setting since |Vac peak| + |Vdc| ≤ 5 V (into 50Ω). If
the DC offset is zero the amplitude range for each of the functions is shown
below:
Note: The rms value for NOISE is based on the total power in the output
bandwidth (about 3.5 MHz) at a given peak to peak setting.
Vpp
Vrms
Function
Max.
Min.
Max.
Min.
Sine
Square
Triangle
Ramp
Noise
10V
10V
10V
10V
10V
50 mV
50 mV
50 mV
50 mV
50 mV
3.54V
5.00V
2.89V
2.89V
1.62V
0.02Vrms
0.03Vrms
0.01Vrms
0.01Vrms
0.01Vrms
50Ω
Ω Load Impedance
DS335 Synthesized Function Generator