×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Measurement of Generated Power in a Function Generator

## Measurement of Generated Power in a Function Generator

(OP)
I am using the following function generator for testing a circuit. I need to measure the power generated by the function generator. Please advise how i can do it.
http://www.rigolna.com/products/waveform-generator...

### RE: Measurement of Generated Power in a Function Generator

(OP)
Of course the generator doesn't display
The current.also, The data sheet doesn't specify the internal resistance

### RE: Measurement of Generated Power in a Function Generator

Data sheet mentions "CH1: 2 mVpp ~ 10 Vpp（50 Ω），4 mV ~ 20 Vpp（High Z)"

The 2:1 ratio (20 & 10) confirms that the source Z is 50 ohms.

Note that it's Vpp. You'd need RMS for power. Complex waveforms can get a bit complicated.

To measure the power you'd need to know the voltage (easier) and current (a bit trickier). Also, if AC and complex impedance, then phase angle enters into it.

Can you provide more details?

### RE: Measurement of Generated Power in a Function Generator

(OP)
the generator displays 20 Vpp and I am at 100 KHz frequency. My circuit consists of a diode bridge and then a voltage regulator.

### RE: Measurement of Generated Power in a Function Generator

(OP)
BTW, I am kind of confused. what does High Z mean for the 4mV~20 Vpp

### RE: Measurement of Generated Power in a Function Generator

A 50-ohm source feeding a 50-ohm load will split the voltage half each (internal and external). If the load is open circuit or high Z, then you'll see the total voltage on the port.

Why use all this feeding a bridge rectifier and voltage regulator? Is the bridge compatible with 100 kHz? ...getting towards RF, diode speed. And did you include a filter capacitor? ...otherwise poor regulator.

What are you up to?

### RE: Measurement of Generated Power in a Function Generator

What are you trying to do? The maximum power possible from the generator is only (10V)^2/50ohm = 2W. This is hardly an apropos application for a box that consumes 40W.

Is this for school?

TTFN
FAQ731-376: Eng-Tips.com Forum Policies

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

Of course I can. I can do anything. I can do absolutely anything. I'm an expert!

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!