Setting The Digital Output; Function Type; Frequency - Stanford Research Systems DS360 Operating Manual And Programming Reference

5-6 Digital Output

Setting the Digital Output

The following section describes how to set the parameters for the digital output functions of the DS360,
including function type, frequency, amplitude, mode, number of bits and digital sampling frequency.
Please note that in digital mode several analog mode functions are disabled and cannot be selected.
All parameters for the digital output are independent from their analog counterparts. When the digital
mode is entered, the last digital output frequency used will be recalled, not the one previously used for the
analog outputs. There are separate computer interface commands to set the various parameters as well.
Output Mode
The DS360 has two different output modes: analog and digital. The currently selected
output is indicated by the LED in the OUTPUT section (balanced / unbalanced or
digital). Pressing [SHIFT] [∨] output down key toggles between the two different modes.
The operation for the balanced and unbalanced outputs is described in Chapter 3.
When the digital mode is selected, the front panel analog output is disabled and the rear
panel digital output is enabled. Note that in digital mode several functions are disabled
and cannot be selected.

Function Type

The DS360 output function type is selected using the [∧] up and [∨] down function arrow
keys. Press the appropriate key until the desired function LED is lit. In digital mode only
sine waves and two sine 2 tone functions are available. Other functions cannot be
selected. When in 2-Tone, only one set of parameters (amplitude, frequency) are
available at a time. To toggle between displaying Tone 1 and Tone 2 parameters, press
[SHIFT][T1/T2].

Frequency

To display the current output frequency, press the [FREQ] key. The frequency is
displayed in Hz or kHz, depending on which unit LED is lit. The DS360 has 6 digits of
frequency resolution or 10 mHz, whichever is greater. Any non displayed digits are
zeroed to avoid having slightly different output frequencies for a given display value. The
output frequency for the digital output is maintained separately from that of the analog
output functions, so that when changing between digital and analog modes, the previous
digital frequency will be recalled.
The frequency ranges are shown in the table below. Frequency resolution is 6 digits or
0.01 Hz, whichever is larger.
DS360 Ultra Low Distortion Function Generator