Liquid Instruments
User Manual for LIQUID models including: Arbitrary Waveform Generator Software
25 mag 2021 — Moku:Go's Arbitrary Waveform Generator can generate custom waveforms with up to 65,536 points at update rates of up to 125 MSa/s.
3 | Moku:Go’s Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved.
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DocumentDocumentArbitrary Waveform Generator Moku:Go User Manual Moku:Go's Arbitrary Waveform Generator can generate custom waveforms with up to 65,536 points at update rates of up to 125 MSa/s. Waveforms can be loaded from a file, or input as a piecewise mathematical function with up to 32 segments, enabling you to generate truly arbitrary waveforms. In pulsed mode, waveforms can be output with more than 250,000 cycles of dead time between pulses, allowing you to excite your system with an arbitrary waveform at regular intervals over extended periods of time. V21-0407 www.liquidinstruments.com 2021 Liquid Instruments. All rights reserved. Table of Contents User Interface....................................................................................................................................... 3 Secondary click 5 Main Menu ............................................................................................................................................ 6 Output Configuration .......................................................................................................................... 7 Enable / Disable Outputs 7 Load Impedance 7 Selecting the correct load impedance 7 Modulation Modes 8 Off 8 Pulsed 8 Burst 9 Waveform Types ................................................................................................................................ 10 Custom 11 Uploading custom waveforms 11 Maximum recommended sampling rate 11 Amplitude scaling and interpolation 11 Equation 12 Waveform segments 12 Equation editor 13 Power Supply ..................................................................................................................................... 14 2 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Ensure Moku:Go is fully updated. For the latest information: www.liquidinstruments.com 3 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. User Interface ID Description ID Description 1 Main menu 8 Enable/disable output 2 Configure amplitude / high level 9 Configure waveform shape 3 Configure number of points 10 Enable/disable modulation 4 Configure sample rate 11 Active parameter* 5 Configure frequency / period / update rate 12 Switch between representations* 6 Turn linear interpolation on or off 13 Configure phase 7 Configure offset *Click the amplitude, offset, frequency, or phase number to make it the active parameter. For amplitude and offset, click the swap button to switch between Vpp/offset or high/low level representations. For frequency, click the swap button to switch between frequency or period representations. 4 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Secondary click Sync phase with copy settings between channels can be accessed by right click (secondary click) menu on the main user interface. The settings on one output can be instantly applied to the other output with copy settings. And the phase between two channels can be aligned with sync phase. In additional, you can edit the equation or load your custom waveform via this menu. Detailed information about the equation editor and custom waveform can be found in a later section. 5 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Main Menu The main menu can be accessed by pressing the icon on the top-left corner. This menu provides the following options: Options Shortcuts Save/recall settings: · Save instrument state Ctrl+S · Load instrument state Ctrl+O · Show current sate Reset instrument Ctrl+R Power supply File manager File converter Help · Liquid Instruments website · Shortcuts list Ctrl+H · Manual F1 · Report an issue · About Description Save the current instrument settings. Load last saved instrument settings. Show the current instrument settings. Reset the instrument to its default state. Access power supply control window.* Open file manager tool. Open file converter tool. Access Liquid Instruments website. Show Moku:Go app shortcuts list. Access instrument manual. Report bug to Liquid Instruments. Show app version, check update, or license information. * Power supply is available on Moku:Go M1 and M2 models. Detailed information about power supply can be found in Moku:Go power supply manual. 6 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Output Configuration Enable / Disable Outputs Enable the output of the selected channel by pressing the icon Disable the output of the selected channel by pressing the icon Load Impedance Moku:Go assumes the external load to have a high load impedance. Selecting the correct load impedance Moku:Go's outputs have an impedance of 200 . As such, voltages supplied to a 50 load will be reduced and not recommended. 7 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Modulation Modes Moku:Go's Arbitrary Waveform Generator supports three modulation modes: Off, Pulsed, and Bursted. Off In normal mode, the output waveform is repeated continuously with no dead time between cycles. Pulsed In pulsed mode, the output waveform can be configured to have up to 218 = 262144 cycles of dead time between each repetition of the arbitrary waveform. ID Parameter 1 Dead cycles 2 Dead voltage Description The period of each cycle of dead time is equal to the selected period of the waveform. The dead time voltage can be configured to equal any DC value between the waveform's minimum and maximum voltages. 8 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Burst In burst mode, the output waveform can be triggered from another signal source. The output once triggered varies according to the trigger mode. ID Parameter 1 Burst cycle count 2 Burst mode 3 Trigger level 4 Input range 5 Trigger source Description N - Cycle mode only. The number of cycles to generate before re-arming. N -Cycle or Start. The Start mode generates infinite loops of the waveform after the trigger event. Set the voltage level to trigger at. Set the input channel range. Select between input 1 or 2. 9 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Waveform Types Generate one of five pre-set waveforms, a custom waveform from a file, or a waveform defined by a series of piece-wise mathematical equations. 10 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Custom Uploading custom waveforms · Upload custom waveforms from comma- or newline-delimited text from a computer file or clipboard. · Up to 8,192 points can be output at an update rate of 125 MSa/s, up to 16,384 points at 62.5 MSa/s, up to 32768 points at 31.25 MSa/s and up to 65,536 points at 15.625 MS/s Maximum recommended sampling rate · The maximum safe frequency of the generated waveform is equal to the sampling rate divided by the number of points in the custom waveform . o For example, the maximum safe frequency of a 1000-point waveform is 125 MSa/s ÷ 1000 Samples = 125 kHz . · Exceeding the maximum recommended frequency will result in some points being skipped. Amplitude scaling and interpolation · The amplitude of custom waveforms will be normalized to the range [-1, +1] and then scaled to the desired amplitude and offset. · Select between linear and no interpolation. 11 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Equation The equation waveform type enables you to design arbitrary waveforms using up to 32 piecewise mathematical functions. Waveform segments · Add up to 32 waveform segments and define their time fractional time periods within a single period of the total waveform. · To add or remove segments, press the Add / Remove label and click the and icons that appear to the left of the equations. · To modify the period of an individual segment, click its time segment label and type in the desired end time for that period. The starting time for each segment is the end time for the previous segment. 12 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Equation editor · The equation editor allows you to define arbitrary mathematical functions for each segment in the waveform. · Select from a range of common mathematical expressions including trigonometric, quadratic, exponential and logarithmic functions. · The variable t represents time in the range from 0 to 1 periods of the total waveform · Access recently entered equations by pressing the icon. · The validity of the entered equation is indicated by the and icons that appear to the right of the equation box. 13 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Power Supply Moku:Go Power supply is available on M1 and M2 models. M1 features a 2-channel power supply, while M2 features a 4-channel power supply. The power supply control window can be accessed in all instruments under the main menu. The power supply operates in two modes: constant voltage (CV) or constant current (CC) mode. For each channel, the user can set a current and voltage limit for the output. Once a load is connected, the power supply operates either at the set current or set voltage, whichever comes first. If the power supply is voltage limited, it operates in the CV mode. If the power supply is current limited, it operates in the CC mode. ID Function 1 Channel name 2 Channel range 3 Set value 4 Readback numbers 5 Mode indicator 6 On/Off Toggle Description Identifies the power supply being controlled. Indicates the voltage/current range of the channel. Click the blue numbers to set the voltage and current limit. Voltage and current readback from the power supply, the actual voltage and current being supplied to the external load. Indicates if the power supply is in CV (green) or CC (red) mode. Click to turn the power supply on and off. 14 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved. Ensure Moku:Go is fully updated. For the latest information: www.liquidinstruments.com 15 | Moku:Go's Arbitrary Waveform Generator User Manual © 2021 Liquid Instruments. All rights reserved.