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281, 282, 284
Users Manual
Introduction
This section deals with the use of the instrument as a standard function generator, i.e.
generating sine, square, triangle, dc, ramp, haversine, cosine, havercosine and sin(x)/x
waveforms. All but the square wave are generated by DDS which gives 7-digit frequency
precision; the square wave is generated by clock synthesis which results in only 4-digit
frequency resolution. Refer to Principles of Operation in the previous chapter for an
explanation of the differences.
Standard Waveform Operation
The STANDARD WAVEFORMS screen also includes arbitrary and sequence for
simplicity of switching between these and standard waveforms; they do, however, have
their own screens (accessed by pressing ARB and SEQUENCE respectively) and are
described in detail in their appropriate sections. Pulse and pulse-train are also accessed
from the standard waveforms screen but are sufficiently different to justify their own
section in this manual.
Most of the following descriptions of amplitude and offset control, as well as of mode,
sweep, etc., in following sections, apply to arbitrary and sequence as well as standard
waveforms; for clarity, any differences of operation with arbitrary, sequence, pulse and
pulse-train are described only in the appropriaite sections.
Setting Generator Parameters
Waveform Selection
Pressing the STD key gives the STANDARD WAVEFORMS screen which lists all the
waveforms available:
STANDARD WAVEFORMS
sine
square
triangle
The rotary control or cursor keys can be used to scroll the full list back and forward
through the display. The currently selected waveform (sine, with the factory defaults
setting) is indicated by the filled diamond; the selection is changed by pressing the soft-
key beside the required waveform.
Frequency
Pressing the FREQ key gives the STANDARD FREQUENCY screen:
STANDARD FREQUENCY
10.00
000 kHz
freq period
With freq selected as shown above, the frequency can be entered directly from the
keyboard in integer, floating point or exponential format. For example, 12·34 kHz can be
entered as 12340, 12340·00, or 1·234 exp 4, etc. However, the display will
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