testing device with 1 K load

[jwga14]

Hi all,
I would like to conduct a bench test by injecting RF sin wave with 1.5- 2.6 GHz signal with different dBm (-110 to 20 dBm).
The test required to measure the output using 1 K load.
I am not familiar how to integrate the 1 K load and from where I can get it, and measure the output (to test AGC automated gain controller).
Please advise how I may conduct this test
VR

 

[crutschow]

What is the device you are testing?
What frequency is the output?
A 1k load is unusual for something operating at that frequency range.

 

[FvM]

In RF domain, I read 1k as unloaded operation. For the measurement, you can use an active probe or a resistive passive probe.

 

[jwga14]

What is the device you are testing?
What frequency is the output?
A 1k load is unusual for something operating at that frequency range.

I am testing a satellite receiver , 2335 and 1780 GHz. The output freq is 70 MHz, but I am testing the demodulated AM signal with AGC. It is input in dBm and output in vdc.

--- Updated Jun 4, 2022 ---

In RF domain, I read 1k as unloaded operation. For the measurement, you can use an active probe or a resistive passive probe.

Thanks, can you send me an example of a resistive passive probe?

 

[crutschow]

So you need to measure the DC output?
For that, just connect the resistor from the output to ground, and measure with a voltmeter.

 

[FvM]

If the output is DC or low frequency AC, you'd just connect an 1k load resistor and any kind of high impedance measurement instrument.

A paasive probe with several 100 MHz up to GHz bandwidth is build like shown below (copied from Joe Weber, Oscilloscop probe circuits, Tektronix 1969)

A 950 ohms resistor makes a 20:1 probe with 1k input impedance.

 

[BigBoss]

70 MHz can be easily measured with an Oscilloscope. Terminate your system with 1K and put the High Impedance Voltage probe to this point. Then convert the Voltage to dBm.

 

[dick_freebird]

A well written test spec should include all conditions of
measurement. I'm guessing this is more of a verbal or
napkin sketch situation? So who's telling you "fragments
of "how" (as it seems) and do they possess the complete
story, to give you?

If this is a commercial part maybe its datasheet has a
more useful / complete test setup note, attending that
parameter.