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Arbitrary Waveform Generation
Selecting and Outputting Arbitrary Waveforms 9
These steps are fully described in the Creating New Waveforms and Modifying Arbitrary
Waveforms sections which follow.
Waveform creation using waveform design software also consists of two steps:
1. Creating the waveform using the software on a PC.
2. Downloading the waveform directly to the memory card (using the USB-connected
card reader/writer) and inserting the card into the instrument. Alternatively, the
waveform can be downloaded to the generator via the RS232, GPIB or USB
interfaces. This process is described in chapter 14 and Appendix E.
Modification of an arb waveform that is currently running on the instrument is subject to
certain constraints; these are mentioned in the appropriate individual sections and
warning or error messages will be given if illegal operations are attempted. As a general
rule, modification of a current waveform should only be implemented with the generator
running in continuous mode.
Selecting and Outputting Arbitrary Waveforms
With a memory card plugged in, press the ARB key to see the list of all the arbitrary
waveforms held on the card.
ARBITRARY WAVEFORMS
WFM1 4096
WFM2 11000
SPIKE100 100000
If no card is fitted the display will show the message
Please insert a memory card.
If there are no waveforms on the card the message will be
There are no arb waveforms available.
If the generator is switched on without a card fitted, and the power-on conditions have
been set to recall power-down set-up which included an arb waveform, an error message
File <name> not found, load std square
is temporarily displayed and the generator defaults to a square wave output.
With a card plugged in the rotary knob or cursor keys can be used to scroll the full list
backwards and forwards through the display. Select the required waveform by pressing
the associated soft key.
To make it easier to find a particular waveform in a long list it is recommended that the
waveforms on the card are first sorted into alphabetical order using the sort facility on the
MEMORY CARD screen accessed from the UTILITY menu (refer to chapter 14
Memory Card).
Note that the last used arb waveform can also be selected to run from the
STANDARD WAVEFORMS screen, accessed by pressing the STD key, by pressing the
arb soft key in the STANDARD WAVEFORMS list; this makes it easier to switch
quickly between a true standard waveform (e.g. sine) and a particular arb.
9-3
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