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Laura Becerra
laura@liquidinstruments.com
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What is the maximum roll-off that the FIR Filter Builder and Digital Filter Box can achieve?
Published June 3rd, 2025 by Laura Becerra
The roll-off achieved by the FIR Filter Builder depends on the number of coefficients used in the filter. The FIR Filter Builder supports up to 14,819 coefficients depending on the sampling rate. Lower sampling rates allow for a higher number of coefficients, and vice-versa. The roll-off can be manually calculated using the gain plot of the filter a
How does the amplitude modulation setting in the Waveform Generator affect the output amplitude?
Published July 2nd, 2025 by Laura Becerra
The Waveform Generator can be set to modulate the output signal amplitude using an internal sinusoid or an external signal. When using an internal sinusoid, a percentage setting is used to set modulation depth. The modulation percentage corresponds to the top and bottom edges of the waveform alternating between +/- the percentage of the amplitude
How to change the access point password on Moku
Published August 12th, 2025 by Laura Becerra
Every Moku device contains an onboard Wifi access point. Details on how to connect to the access point can be found here. To change the access point password, click the gear icon after hovering over your device on the Moku homepage. Click on the “Access Point” tab and modify the password in the “Password” box.
How do I adjust the output voltage range limits on Moku:Pro?
Published April 2nd, 2025 by Laura Becerra
Moku:Pro has two options for output voltage range into 50 Ohms: +/- 1V (2 Vpp) and +/- 5V (10 Vpp). To adjust the output voltage range on the Lock In Amplifier, FIR Filter Builder, PID Controller, Digital Filter Box, and Laser Lock Box, the output gain on the right hand side should be selected and changed to 0 dB for +/- 1V and +14 dB for +/- 5V as
How can I maintain my output signal in between API calls?
Published March 11th, 2025 by Laura Becerra
Each time the API connects to a Moku device, it resets the outputs. To avoid disruptions in output signals in between API calls, use ‘persist_state’ when claiming ownership of your Moku device. Below is an example of how to implement persist_state: Python: i = WaveformGenerator('xxx.xxx.x.xx', force_connect=True, persist_state=True) MATLAB: i = Moku
How to use APIs with MokuOS 4.0
Published August 28th, 2025 by Laura Becerra
Moku offers APIs for Python, MATLAB, and LabVIEW for seamless automation and integration into your workflow. Starting with MokuOS 4.0, the use of APIs requires the command line utility, mokucli. What is mokucli? Mokucli allows users to access and manage Moku hardware through their command terminal. Functionalities include bitstream downloads, device
Why is the Moku:Pro peak-to-peak voltage limited to 2 Vpp in MiM when the max output is 10 Vpp?
Published February 3rd, 2023 by Laura Becerra
Summary The Moku:Pro has two output gain ranges, one covering 2Vpp and one up to 10Vpp. When using one instrument, this range is automatically changed as you change the signal amplitude. In Multi-instrument Mode, the gain needs to be manually set to access the higher range. This is done by selecting the 14dB gain for a DAC output on the Multi-instru
How to use Moku devices with a Linux-based operating system
Published September 30th, 2025 by Laura Becerra
The Moku app/GUI is currently only available for Windows, MacOS, and iPadOS. Unfortunately, it is not yet available for Linux-based OSs, including any Debian-based distributions such as Ubuntu or Linux Mint, and others. However, Moku devices can still be operated using APIs and MokuCLI, a command-line utility for Moku hardware. Since the release of
How to format 5 GSa/s output data from Moku:Pro prior to MokuOS 4.0
Published April 11th, 2025 by Laura Becerra
Moku:Pro can be configured to save high resolution data at a rate of 5 GSa/s with certain channel configuration settings. Details on how to configure these settings can be found in this knowledge base. NOTE: This knowledge base is only applicable for firmwares compatible with software versions prior to MokuOS 4.0 (Firmware versions 601 and below). P
Setting up mokucli on Linux with symbolic link
Published February 5th, 2025 by Laura Becerra
To set up mokucli symbolic link on a Linux system: Download the latest mokucli package from the Utilities page . Once the download is complete, get the path for mokucli. Using your terminal, navigate to the inside of the extracted downloads folder. You should see mokucli listed. Type “pwd” in your terminal once inside of the extracted folder to get
Why does the message, "Instrument frame rates may be reduced in this configuration" appear in Multi-Instrument Mode?
Published April 11th, 2025 by Laura Becerra
When using Multi-Instrument Mode (MiM), there are four instruments that can cause the warning “Instrument frame rates may be reduced in this configuration” to appear when placed in one of the instrument slots. The four instruments are the Oscilloscope, Laser Lock Box, Lock-In Amplifier, and Logic Analyzer. These instruments can acquire data at the f
How to send a Laser Lock Box error signal to an output
Published November 13th, 2025 by Laura Becerra
Moku offers a Laser Lock Box (LLB) to lock a laser onto a cavity using a variety of locking methods. The output signal of the LLB is typically a control signal output from the fast and/or slow PID controllers. The error signal used for the locking process is what is passed into the PID controllers. However, there may be applications that require the
How do I convert dB units from the Frequency Response Analyzer to voltage?
Published March 14th, 2025 by Laura Becerra
The Frequency Response Analyzer calculates gain in decibels (dB) by determining the voltage ratio between the output and input signals. The gain is expressed using the following equation: dB = 20*log10(Vout/Vin)
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