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Title: How to Use the Modulated Waveform Function of HDG6000B? [Print this page]
Author: WisdomAugust Time: 2019-10-21 08:11
Title: How to Use the Modulated Waveform Function of HDG6000B?
How to Use the Modulated Waveform Function of HDG6000B?
[attach]3204[/attach]
Author: WisdomAugust Time: 2019-10-22 08:12
To Output a Modulated Waveform
A modulated waveform consists of a carrier and a modulating waveform. In AM (amplitude modulation),
the amplitude of the carrier is varied by the amplitude of the modulating waveform. For this example, you
will output an AM waveform with 80% modulation depth. The carrier will be a 5 kHz sine wave and the
modulating waveform will be a 200 Hz sine wave.
[attach]3205[/attach]
AM waveform display on oscilloscope
Author: WisdomAugust Time: 2019-10-23 08:12
1 Select the function, frequency, and amplitude of the carrier.
Press Sine key and then press the Freq, Ampl, and Offset softkeys to configure the carrier waveform.
For this example, select a 5 kHz sine wave with an amplitude of 5 Vpp.
[attach]3207[/attach]
Author: WisdomAugust Time: 2019-10-24 08:06
2 Select AM.
Press Mod key and then select “AM” using the Type softkey.
3 Set the modulation depth.
Press the AM Depth softkey and then set the value to 80% using the numeric keypad or the knob and
cursor keys.
4 Set the modulating frequency.
Press the AM Freq softkey and then set the value to 200 Hz using the numeric keypad or the knob and
cursor keys.
Author: WisdomAugust Time: 2019-10-25 09:32
5 Select the modulating waveform shape.
Press the Shape softkey to select the shape of the modulating waveform.
For this example, select a sine wave.
[attach]3210[/attach]
At this point, the function generator outputs an AM waveform with the specified modulation parameters
(if the output is enabled).
Author: WisdomAugust Time: 2019-10-26 08:18
To Output an FSK Waveform
You can configure the function generator to “shift” its output frequency between two preset values using
FSK modulation. The rate at which the output shifts between the two frequencies (called the “carrier
frequency” and the “hop frequency”) is determined by the internal rate generator or the signal level on
the front-panel Trig connector. For this example, you will set the “carrier” frequency to 3 kHz and the
“hop” frequency to 500 Hz, with an FSK rate of 100 Hz.
[attach]3211[/attach]
Author: WisdomAugust Time: 2019-10-28 08:03
1. Select the function, frequency, and amplitude of the carrier.
Press Sine key and then press the Freq, Ampl, and Offset softkeys to configure the carrier waveform.
For this example, select a 3 kHz sine wave with an amplitude of 5 Vpp.
[attach]3215[/attach]
Author: WisdomAugust Time: 2019-10-29 08:08
2 Select FSK.
Press Mod key and then select “FSK” using the Type softkey.
3 Set the “hop” frequency.
Press the Hop Freq softkey and then set the value to 500 Hz using the numeric keypad or the knob and cursor keys.
4 Set the FSK “shift” rate.
Press the FSK Rate softkey and then set the value to 100 Hz using the numeric keypad or the knob and cursor keys.
[attach]3216[/attach]
At this point, the function generator outputs an FSK waveform (if the output is enabled).
Author: WisdomAugust Time: 2019-11-4 10:12
To Output a PWM Waveform
You can configure the function generator to output a pulse width modulated (PWM) waveform. HDG6162B
provides PWM for square carrier waveforms, and PWM is the only type of modulation supported for Square
waveforms. In PWM, The pulse width of the carrier waveform varies with the voltage level of the modulating
waveform.
You can specify either a duty or a deviation to be controlled by the modulating waveform.
For this example, you will specify a deviation for a 1 kHz square waveform with a 100 Hz sine wave modulating
waveform.
Author: WisdomAugust Time: 2019-11-7 08:00
1 Select the carrier waveform parameters.
Press Square key and then press the Freq, Ampl, Offset, Width, and Edge Time softkeys to configure
the carrier waveform. For this example, select a 1 kHz square waveform with an amplitude of 1 Vpp, a
zero offset, a phase of 0 degree, and a duty of 50%.
[attach]3232[/attach]
Author: WisdomAugust Time: 2019-11-8 11:54
2 Select PWM.
Press Mod key, select type as PWM.
3 Set the width deviation.
Press the Deviation softkey and set the value to 20% using the numeric keypad or the knob and cursor
keys.
4 Set the modulating frequency.
Press the PWM Freq softkey and then set the value to 5 Hz using the numeric keypad or the knob and
cursor keys.
5 Select the modulating waveform shape.
Press the Shape softkey to select the shape of the modulating waveform.
For this example, select a sine wave.
[attach]3235[/attach]
At this point, the function generator outputs a PWM waveform with the specified modulation parameters
(if the output is enabled).
Author: WisdomAugust Time: 2019-11-9 08:05
6 View the waveform.
Of course, to really view the PWM waveform, you would need to output it to an oscilloscope. If you do this,
you will see how the duty cycle deviation varies, in this case, from 0% to 50%. At a modulation frequency
of 5 Hz, the deviation is quite visible.
[attach]3236[/attach]
Author: WisdomAugust Time: 2019-11-11 08:21
Amplitude Modulation (AM)
A modulated waveform consists of a carrier waveform and a modulating waveform. In AM, the amplitude
of the carrier is varied by the instantaneous voltage of the modulating waveform. The function generator
will accept an internal or external modulation source.
To Select AM Modulation
? The function generator will allow only one modulation mode to be enabled at a time. For example, you
cannot enable AM and FM at the same time. When you enable AM, the previous modulation mode is
turned off.
? The function generator will not allow AM to be enabled at the same time that sweep or burst is enabled.
When you enable AM, the sweep or burst mode is turned off.
Author: WisdomAugust Time: 2019-11-12 08:59
? Front-Panel Operation: You must enable AM before setting up any of the other modulation parameters.
Press Mod key and then select “AM” using the Type softkey. The AM waveform is output using the
present settings for the carrier frequency, modulating frequency, output amplitude, and offset voltage.
[attach]3239[/attach]
Author: WisdomAugust Time: 2019-11-13 09:11
Carrier Waveform Shape
? AM carrier shape: Sine, Square, Ramp, Pulse, Arbitrary or Harmonic waveform. The default is Sine.
You cannot use noise, or dc as the carrier waveform.
[attach]3245[/attach]
Author: WisdomAugust Time: 2019-11-14 09:15
? Front-Panel Operation: Press any of the front-panel function keys except Noise. For arbitrary waveforms,
press Arb and then choose the Select Type softkey to select the active waveform.
[attach]3250[/attach]
Author: WisdomAugust Time: 2019-11-15 08:05
Carrier Frequency
The maximum carrier frequency depends on the function selected as shown below. The default is 1 kHz
for all functions.
Function | | |
| | 200MHz 60MHz 5MHz 50MHz 50MHz |
? Front-Panel Operation: To set the carrier frequency, press the Freq softkey for the selected function.
Then use the knob or numeric keypad to enter the desired frequency.
Author: WisdomAugust Time: 2019-11-18 08:25
Modulating Waveform Shape
The function generator will accept an internal or external modulation source for AM.
? Modulating waveform shape (internal source): Sine, Square, Ramp, Noise, or Arb waveforms (Sinc, Exp Fall, Haver Sine, Lorentz, Gause, Dual Tone, ECG). The default is Sine.
? Sine
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When modulating waveform shape is Sine, display on the generator.
Author: WisdomAugust Time: 2019-11-19 08:16
[attach]3260[/attach]
When modulating waveform shape is Sine, display on the oscilloscope.
Author: WisdomAugust Time: 2019-11-20 08:08
Edited by WisdomAugust at 2019-12-5 09:54
? Noise
[attach]3291[/attach]
When modulating waveform shape is Noise, display on the generator.
Author: WisdomAugust Time: 2019-11-21 08:04
[attach]3274[/attach]
When modulating waveform shape is Square, display on the oscilloscope.
Author: WisdomAugust Time: 2019-12-2 08:32
The ramp has 50% symmetry. [attach]3285[/attach]
[attach]3286[/attach]
When modulating waveform shape is Ramp, display on the generator.
Author: WisdomAugust Time: 2019-12-3 10:25
[attach]3287[/attach]
When modulating waveform shape is Ramp, display on the oscilloscope.
Author: WisdomAugust Time: 2019-12-5 09:51
Square has a 50% duty cycle. [attach]3289[/attach]
[attach]3290[/attach]
When modulating waveform shape is Square, display on the generator.
Author: WisdomAugust Time: 2019-12-5 09:55
? Noise
[attach]3292[/attach]
When modulating waveform shape is Noise, display on the generator.
Author: WisdomAugust Time: 2019-12-6 08:30
[attach]3296[/attach]
When modulating waveform shape is Noise, display on an oscilloscope.
Author: WisdomAugust Time: 2019-12-7 08:28
? Sinc (Arbitrary Waveform)
[attach]3297[/attach]
When modulating waveform shape is Sinc, display on the generator.
Author: WisdomAugust Time: 2019-12-9 08:16
[attach]3301[/attach]
[attach]3302[/attach]
When modulating waveform shape is Sinc, display on an oscilloscope.
Author: WisdomAugust Time: 2019-12-10 08:10
Exp Fall (Arbitrary Waveform)
[attach]3304[/attach]
When modulating waveform shape is Exp Fall, display on the generator.
Author: WisdomAugust Time: 2019-12-11 08:20
[attach]3307[/attach]
When modulating waveform shape is Exp Fall, display on an oscilloscope.
Author: WisdomAugust Time: 2019-12-12 08:09
? Haver Sine (Arbitrary Waveform)
[attach]3310[/attach]
When modulating waveform shape is Haver Sine, display on the generator.
Author: WisdomAugust Time: 2019-12-13 10:53
[attach]3321[/attach]
When modulating waveform shape is Haver Sine, display on an oscilloscope.
Author: WisdomAugust Time: 2019-12-16 08:24
Edited by WisdomAugust at 2019-12-16 08:25
? Lorentz (Arbitrary Waveform)
[attach]3323[/attach]
When modulating waveform shape is Lorentz, display on the generator.
Author: WisdomAugust Time: 2019-12-17 08:10
[attach]3324[/attach]
When modulating waveform shape is Lorentz, display on an oscilloscope.
Author: WisdomAugust Time: 2020-1-2 14:22
? Gauss (Arbitrary Waveform)
[attach]3345[/attach]
When modulating waveform shape is Gauss, display on the generator.
Author: WisdomAugust Time: 2020-1-3 08:54
[attach]3347[/attach]
When modulating waveform shape is Lorentz, display on an oscilloscope.
Author: WisdomAugust Time: 2020-1-4 08:08
? Dual Tone (Arbitrary Waveform)
[attach]3351[/attach]
When modulating waveform shape is Dual Tone, display on the generator.
Author: WisdomAugust Time: 2020-1-6 08:04
[attach]3353[/attach]
When modulating waveform shape is Dual Tone, display on an oscilloscope.
Author: WisdomAugust Time: 2020-1-7 08:08
Cardiac - ECG (Arbitrary Waveform)
[attach]3354[/attach]
When modulating waveform shape is ECG, display on the generator.
Author: WisdomAugust Time: 2020-1-8 09:12
[attach]3356[/attach]
[attach]3357[/attach]
When modulating waveform shape is ECG, display on an oscilloscope.
Author: WisdomAugust Time: 2020-1-9 08:55
? You can use noise as the modulating waveshape, but you cannot use noise, or dc as the carrier waveform.
? If you select an arbitrary waveform as the modulating waveshape, the waveform is automatically limited to 4K points. Extra waveform points are removed using decimation.
? Front-Panel Operation: After enabling AM, press the Shape
Modulating Waveform Frequency
The function generator will accept an internal or external modulation source for AM.
? Modulating frequency (internal source): 2mHz to 50kHz. The default is 100 Hz.
? Front-Panel Operation: After enabling AM, press the AM Freq softkey, and then use the numeric keyboard or direction keys and knob to input the desired frequency value.
Author: WisdomAugust Time: 2020-1-10 10:03
Modulation Depth
The modulation depth is expressed as a percentage and represents the extent of the amplitude variation.
At 0% depth, the output amplitude is half of the selected value. At 100% depth, the output amplitude equals
the selected value.
? Modulation depth: 0% to 120%. The default is 100%.
? Note that even at greater than 100% depth, the function generator will not exceed 10V peak on the output
(into a 50? load).
? If you select the External modulating source, the carrier waveform is modulated with an external waveform.
The modulation depth is controlled by the ±2.5V signal level present on the front-panel Sync/Mod/Trig connector.
For example, if you have set the modulation depth to 100%, then when the modulating signal is at +2.5 volts,
the output will be at the maximum amplitude. When the modulating signal is at -2.5 volts, then the output will be
at the minimum amplitude.
? Front-Panel Operation: After enabling AM, press the AM Depth softkey. Then use the knob or numeric keypad
to enter the depth.
Author: WisdomAugust Time: 2020-1-13 08:09
How to Use the Sweep Function of HDG6000B?
[attach]3361[/attach]
Author: WisdomAugust Time: 2020-1-14 08:25
To Output a Frequency Sweep
In the frequency sweep mode, the function generator “steps” from the start frequency to the stop
frequency at a sweep rate which you specify. You can sweep up or down in frequency, and with
either linear or logarithmic spacing. For this example, you will output a swept sine wave from 1 Hz
to10 Hz. You will not change the other parameters from their default settings: internal sweep trigger,
linear spacing, and 1 second sweep time.
[attach]3364[/attach]
Sweep display on the generator
Author: WisdomAugust Time: 2020-1-15 08:01
[attach]3365[/attach]
Sweep display on the oscilloscope
Author: WisdomAugust Time: 2020-1-16 09:00
1 Select the function and amplitude for the sweep.
For sweeps, you can select sine, square, ramp, or arbitrary waveforms (pulse, noise, and dc are not
allowed). For this example, select a sine wave with an amplitude of 200 mV.
The Sine key light when using a sine wave.
[attach]3366[/attach]
[attach]3367[/attach]
Sine Sweep display on the generator
Author: WisdomAugust Time: 2020-1-17 08:05
[attach]3369[/attach]
Sine Sweep display on the oscilloscope
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