Contact Us

If you still have questions or prefer to get help directly from an agent, please submit a request.
We’ll get back to you as soon as possible.

Please fill out the contact form below and we will reply as soon as possible.

  • Knowledge Base Home
  • Contact Us
  • Home
  • Moku:Lab
  • Moku:Lab Instruments
  • Moku:Lab Frequency Response Analyzer

How is the magnitude in dBm calculated in Moku:Lab’s Frequency Response Analyzer?

Written by Paul Cracknell

Updated at December 22nd, 2020

Contact Us

If you still have questions or prefer to get help directly from an agent, please submit a request.
We’ll get back to you as soon as possible.

Please fill out the contact form below and we will reply as soon as possible.

  • Moku:Go
    Moku:Go Arbitrary Waveform Generator Moku:Go Data Logger Moku:Go Frequency Response Analyzer Moku:Go Logic Analyzer & Pattern Generator Moku:Go Oscilloscope & Voltmeter Moku:Go PID Controller Moku:Go Spectrum Analyzer Moku:Go Waveform Generator Moku:Go Power Supplies Moku:Go Digital Filter Box Moku:Go FIR Filter Builder Moku:Go Lock-in Amplifier
  • Moku:Lab
    Windows Moku:Lab general Moku:Lab Instruments iPad app Software integrations
  • Moku:Pro
    Moku:Pro Instruments
+ More

The Frequency Response Analyzer (FRA) provides response plots of magnitude and phase. While the phase is expressed in degrees, the magnitude is expressed in terms of dBm power. This is a log scale of power expressed in dB relative to 1 milliWatt.

How is this magnitude in dBm calculated in Moku:Lab’s FRA?

Let us take a simple example. We will set the swept sine wave output of the FRA to 1 Vpp, configure 50 Ω input and output impedance, and, for this example, a sweep from 10Hz to 1kHz. Then with a coax cable connecting output 1 of the Moku:Lab to input 1, we run a sweep of the FRA. You should see a flat amplitude response at 4.0 dBm.

How is the 4.0 dBm is calculated?

It comes from this formula (valid for sinusoidal signals):

frequency response analyzer fra bode plot unit magnitude plot dbm

Was this article helpful?

Yes
No

Related Articles

  • Frequency Response of EFI / RFI filter
  • How can I plot the ratio of input 1 and input 2 using the Moku Frequency Response Analyzer?
  • Can Moku:Lab analyze control loops ?
  • Frequency Response Analyzer and harmonics

Sitemap

  • Moku:Lab
  • Instruments
  • Software
  • Company
  • Support
  • Store
  • Terms & Conditions
  • Privacy Policy

Offices

United States
+1 (619) 332-6230
740 Lomas Santa Fe Dr
Suite 102
Solana Beach, CA 92075

Australia
+61 2 6171 9730
243 Northbourne Avenue
Suite 2
Lyneham, ACT 2602

Follow us

Youtube LinkedIn

官方微信

Contact us
© 2021 Liquid Instruments. All rights reserved.

Definition by Author

0
0
Expand