4.2.9. Selection of waveform of channel A:
* The generator could output 16 kinds of waveforms, press
【
Shift
】【
Sine
】
,
【
Shift
】【
Square
】
,
【
Shift
】【
Ramp
】
keys directly to select these three kinds of common waveforms, the corresponding
waveform character will be displayed. Users may select all 16 kinds of waveforms with waveforms
sequence numbers,
【
Shift
】【
Arb
】
key to show current waveforms sequence number, users may also
input waveforms sequence numbers with the numeric keys or adjusting knob to select the corresponding
waveforms defined by the sequence numbers. Except three common waveforms, the waveform character
of the other waveforms are “Arb”. The waveform sequence numbers of 16 kinds of waveforms are listed
as below:
List of names and sequence numbers of 16 waveforms:
sequence
number
waveform
sequence
number
waveform
00
sine
08
limit sine
01
square
09
exponent
02
ramp
10
logarithm
03
pos-pulse
11
tangent
04
neg-pulse
12
sin (x)/x
05
stair
13
half round
06
noise
14
cardiac
07
half sine
15
quake
4.2.10. Setting of duty cycle:
When the present selection of waveform is square or ramp(including pos-square and pos-ramp), users
may press
【
Duty
】
key to display present duty cycle value, input duty cycle value with numeric keys or
adjusting knob, then the output will be square or ramp with a fixed duty cycle value. The definition of
square duty cycle is the ratio of high level time of one square to the period of this square. The usual
thought of square duty cycle is 50
%
, waveforms with other duty cycle are usually named pulse. The
definition of ramp duty cycle is the ratio of rising time of one ramp to the period of this ramp. The ramp
duty cycle is usually named ramp symmetry, ramps with symmetry of 0% or 100% are usually named
sawtooth wave, and ramp with symmetry of 50% is named triangle wave.
When the frequency of square is comparatively high, the setting of duty cycle is limited by the edge time,
in a relationship as below formula:
Duty cycle× Period≥2× Edge time
or
Duty cycle × Period ≤ Period
-(
2× Edge time
)
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