5.2.7. Offset setting
Press
【
Offset
】
key, the light of which will be on, press “V DC” unit to display present offset value. Input
offset value with the numeric keys or adjusting knob for the output signal to generate this DC offset.
The relationship between the maximum DC offset and amplitude value should be below formula, if the setting
of offset exceeds, the generator will modify it until it is within the limit of the maximum offset value.
|offset|
≤
10-Vpp÷2
When it comes to adjust the DC offset of the output signals, it is more convenient to use the adjusting knob
than the numeric keys. As usual, taking no account of the sign of the present DC offset, right rotation makes
the DC level up, while left rotation makes it down, the sign of the DC offset value changes automatically
when passing the zero point.
5.2.8. DC voltage output
Set amplitude at 0V, the offset value could be set arbitrarily within ±10 V range, the generator is now a DC
voltage power supply and outputs specified DC voltage signal.
5.2.9. Output waveform selection
The generator could output 16 kinds of waveforms, and sine, square, Ramp and pulse are four common
waveforms, press
【
Shift
】【
Sine
】【
Shift
】【
Square
】【
Shift
】【
Ramp
】
and
【
Shift
】【
Pulse
】
keys to
select them directly, the corresponding waveform character light will be on. All 16 kinds of waveforms could
be selected with the waveform sequence numbers, press
【
Shift
】【
Waveform
】
key, and the instrument
shows the present waveform sequence number, users may select output waveforms by inputting waveform
sequence number with the numeric keys or adjusting knob. Except the four common waveforms, the
waveform character of other waveforms is “Arb”. The waveform sequence numbers of 16 kinds of waveforms
are as listed as below:
Waveform sequence numbers list
Sequence
number
Waveform
Sequence
number
Waveform
Sequence
number
Waveform
00
Sine
06
Logarithm
12
User-defined 2
01
Square
07
Sinc
13
User-defined 3
02
Ramp
08
Half-round
14
User-defined 4
03
Pulse
09
Cardiogram
15
User-defined 5
04
White noise
10
Vibration
05
Exponent
11
User-defined 1
5.2.10. Duty cycle setting
When the present selection of waveform is square, press
【
Duty
】
key, the “Duty” keyboard light will be on
and the generator display current duty cycle value, input duty cycle value with numeric keys or adjusting
knob, then the output will be a square with a fixed duty cycle value. While the frequency of square changes,
its duty cycle keeps the same. The definition of square duty cycle is the ratio of high level time of one square
to the period of this square. 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)
5.2.11. Symmetry setting
When the present selection of waveform is Ramp, press
【
Duty
】
key, the “Duty” keyboard light will be on
and the generator display current symmetry value, input symmetry value with numeric keys or adjusting knob,
then the output will be a Ramp with a fixed symmetry value. While the frequency of a Ramp changes, its
symmetry keeps the same. The definition of Ramp symmetry is the ratio of rising time of one Ramp to the
period of this Ramp. Ramp with 100% symmetry is named as rising Ramp wave, and Ramp with 0%
symmetry is named as falling Ramp wave, Ramp with 50% symmetry is named as triangle wave.
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