Specifications

3-12 Operation
DS360 Ultra Low Distortion Function Generator
minimize this, keep stop frequencies below 130 kHz when sweeping at maximum
amplitude.
Sweep Type
Press the [∧] up or [∨] down key in the MODIFY FUNC area until the LIN SWP or
LOG SWP LED is lit. The output frequency of a linear sweep changes linearly during
the sweep time. The output frequency of a log sweep changes exponentially during the
sweep time, spending equal time in each decade of frequency (for example, in a log
sweep from 1 kHz to 100 kHz, the sweep will spend half of the time in the 1 kHz to 10
kHz range and the other half in the 10 kHz to 100 kHz range).
Sweep Trigger Source
Sweeps can be continuously triggered, externally triggered or singly triggered. Internally
triggered sweeps use an internal sweep rate generator (see the SWEEP RATE described
below) to set the sweep repetition rate. Externally triggered sweeps begin on the rising
edge of a TTL signal supplied by the user to the TRIGGER/GATE IN BNC on the front
panel. Singly triggered sweeps begin by pressing the front panel [TRIGR] key or from
one of the computer interfaces.
The current trigger source is indicated by an LED under the TRIGGER heading next to
the frequency display. To view the current trigger source for modification, press the
[SHIFT][TRIG SRC] keys. To change the trigger source, use the spin knob or [>] right
or [<] left cursor keys.
While the DS360 is sweeping, the TRIG’D (triggered) LED is lit. It should be lit
continuously for internally triggered sweeps. For external or single triggered sweeps, it
will be lit for the duration of the sweep only. If a new trigger is received during an
external or single triggered sweep including the specified dead time (see SWEEP RATE
for details on dead time), the ERR LED will flash and any triggers will be ignored.
Sweep Rate
The sweep rate can be set continuously from 0.1 Hz (10 s) to 3.1 kHz ( 0.32 ms) with 2
digits of resolution (for example, you can set 1.1 kHz, but not 101 Hz). The period of a
sweep is simply 1/Sweep Rate.
To display the current sweep rate, press the [RATE] key. To change the sweep rate, type
a new value on the numeric keypad, followed by the appropriate units (Hz or kHz). Or
use the spin knob to modify the current value. If a non-valid rate is entered, (1.001 kHz
for example) the DS360 will round the value down to the nearest legal value. If an out of
range value is entered, the DS360 will beep, display “Rate Err” and flash the ERR LED.
Internal Trigger
There are no additional restrictions on internal sweep rates.
External or Single Trigger
The DS360 synchronizes the external (or single) trigger signal to its internal clock.
Because of this, there is an uncertainty of between 0 and 0.317 ms from the start signal