Tone Bursts - Stanford Research Systems DS360 Operating Manual And Programming Reference

1-6 Getting Started

Tone Bursts

This section discribes how to set up tone bursts. The DS360 can produce a tone burst of between 1 and
65534 cycles of sine or square waves with a repetition rate of between 1 and 65535 cycles. It can also
produce bursts of noise. Bursts are generated by synchronously gating the output at zero crossings. The
"on" level of a burst may be any allowable output voltage; the "off" level can be set between 0 and 100%
of the "on" level in 0.1% increments. Bursts can be triggered from the internal rate generator, an external
rate, the front panel or over the computer interface. They can also be gated from an external source. The
DS360 has a TTL burst signal BNC on the rear panel that is high for the duration of the on level of a
burst and low otherwise. Connect the BURST OUT BNC on the rear panel of the DS360 to the second
channel of the oscilloscope and set it to 2 V/div. The oscilloscope should be set to 1 ms/div and to trigger
on the rising edge of this signal.
1. Press [RCL][0].
2. Press the modify function down [∨] key twice.
Press the [RATE] key, then [8][units key].
Press the [SHIFT][RATE] keys, then [3][units key]
Press the [SHIFT][DEPTH] keys, then [1][0][%].
3. Press the modify function [ON/OFF] key.
4. Press the [SHIFT][DEPTH] keys, then [0][%].
5. Press the [RATE] key, then [1][2][units key].
6. Press the [SHIFT][RATE] keys, then [5]
[units key].
7. Press the [FREQ] key, then [4][kHz] key.
DS360 Ultra Low Distortion Function Generator
This places the DS360 in its default state.
Set the DS360 to generate a 3 cycle burst,
repeating every 8 cycles, with a 10% off level.
Any of the 4 units keys can be used.
The oscilloscope should show an 8 cycle burst,
with 3 on cycles and 5 off cycles at 10% of the
"on" level.
Set the DS360 to 0% "off" level.
Observe that the "off" level is now totally flat.
Observe that repetition rate is 12 cycles.
Observe that the "on" time is now 5 cycles.
Observe that the frequency changed, however the
relative "on" and "off" times haven't changed.