Stanford Research Systems DS360 Operating Manual And Programming Reference page 49

Operation 3-15
If a value that is greater than or equal to the current burst rate is entered the unit will
beep, display " B urRatEr" ( burst rate error) and flash the ERR LED.
Noise Bursts
Internal Burst Rate
The burst rate for noise is set in seconds. Any entry key may be used and no units are
displayed. The rate can vary between 20 µs to 600.0 s, with 4 digits of resolution. In
addition, the rate must be greater than and within 4 digits of the Burst Count. To display
the current burst rate, press [RATE]. To modify the rate, type the new value (in seconds)
and press any entry key. Or use the spin knob to modify the displayed value. If an illegal
value is entered, the unit will beep, display " R ange ER " and flash the ERR LED. If a
value less than the current burst count is entered, the unit will beep, flash the ERR LED,
display " A djBur " and adjust the Burst Count to 1/10 of the current Burst Rate. If the
Burst Rate is adjusted to a value more than 4 digits above the current Burst Count, the
Burst Rate is adjusted to the lowest allowable value (i.e. if the initial Burst Count is
0.001s, setting the Burst Rate to 600s will adjust the Burst Count to 0.1s).
External Bursts Rate
External noise bursts are not synchronized to anything, so there isn't the uncertainty
from the TRIGGER IN signal and the start of bursts that there is for sine or square
waves. To never miss a trigger, the maximum external (or single) trigger rate is given
by:
1
<
ExtTrigFreq
BurstCount
when the burst count is expressed in seconds.
Burst Count
The burst count for noise is the "ON" time in a noise burst. Any entry key can be used
and no units are displayed. The burst count can vary between 10 µs to 599.9 s, with 4
digits of resolution. In addition, the burst count must be less than and within 4 orders of
magnitude of the Burst Rate. To display the current burst count, press [SHIFT][BURST
CNT]. To modify the count, type the new value (in seconds) and press any entry key. Or
use the spin knob to modify the displayed value. If an illegal value or a value greater than
or equal the current burst rate is entered, the unit will beep, display " R ange Er " and
flash the ERR LED.
Burst Depth
The burst depth is the attenuation of the "OFF" level compared to the "ON" level. To
enter a specific "OFF" level it is necessary to enter an "ON" level and calculate the
required attenuation to generate the desired "OFF" level. The burst depth on the DS360
can vary from 0 to 100%, with a 0.1% resolution. It can also be displayed or entered in
dB. 0% depth (no output) can only be set in percent. If 0% is set and the units are
changed to dB, the display will show " - 999" as an overflow value since it cannot be
displayed in dB.
To view the current depth, press [SHIFT][DEPTH]. To change the depth, type the new
value followed by the appropriate units key (% or dB). Or use the spin knob to modify
DS360 Ultra Low Distortion Function Generator