Forums › TG Series Discussions › TG124A amplitude test
- This topic has 2 replies, 2 voices, and was last updated 2 years, 4 months ago by osy.
osy February 1, 2021 at 5:47 am
- This topic was modified 2 years, 4 months ago by osy.
When I test TG124A -10dBm @100KHz, 200KHz, 1GHz, 5GHz, 10GHz, 12.4GHz, both edge freq – 100KHz and 12.4GHz are out of spec, I mean more than +/-2dB.
100KHz is more serious than 12.4GHz when I consider cable loss.
1) do you check all freq range to guarantee +/-2dBm over 100KHz~12.4GHz?
2) do you have any estimation why I have worse amplitude in 100KHz than 12.4GHz? (in general)
3) If my cables are not good fit, what is recommneded cable set or test flow for the amplitude test in both edge frequencies?
I hope your help even though my knowledge is so weak at this moment 🙂
Justin CrooksModeratorJustin Crooks February 1, 2021 at 9:44 am
The TG124A is only rated to -15 dBm. The TG44A goes to -10 dBm, though.
We do test each unit at their rated output power. It’s a tricky test, because we measure harmonics (which can be high), and then total output power with a thermal power sensor, and then calculate power at the fundamental frequency.
We do guarantee their accuracy (e.g. -15 dBm at 100 kHz should read -13 to -17 dBm on a suitable RF power meter). If you can make an accurate measurement at the RF output connector, and it is out of tolerance, this would be covered under warranty.
osyParticipantosy February 1, 2021 at 12:59 pm
Thanks for your response.
I’m attaching screen capture from TG124A user manual.
1) It says -30~-12dBm (typical -30dBm~-10dBm)
2) Manual says 100KHz~12.4GHz. So I translate it to -10dBm over -30dBm~10dBm. So I tested it @-10dBm as max.
1. Please let me have your kindness once again what am I wrong?
2. One more thing, the calculation from thermal sensor is very tricky as you said. do you have any reference material so that our team can discuss about that?
(Because we’re failing to get certi in Korea, we’re serious to check amplitude spec items…)
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