开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
  1. Fa-Va5-Users
  2. Topics

Calibration Question

 

Hello all,
I need some assistance with the calibration process as I am obviously doing it wrong.
A 25 Ohm pure resistive load shows an SWR of 2.7?
I have a set of open/short/ 50 Ohm calibration loads from my AIM 4170C plus the 50 Ohm load which came with the unit.
Further where do I obtain the short and opern delay values?
Thanks in advance
 

Hello Hans
did you do a "master calibration" as described on page-12 of the manual ? The data of the "current calibration" on page 11 is lost when the unit is switched off (page 11, last par). This might explain your problem with a 25 Ohm load.?

I am not aware of using electrical length (delay) data in the VA5 calibration. Maybe someone else can answer that question. If the electrical length of the calibration standard is small, it will only affect measurement accuracy at relatively high frequencies. Certainly not a problem on HF.

73
Dieter, VK3FFB
 

Hello Dieter,
I have now purchased the calibration kit and will advise the results when it arrives.
Danke und 73

On Sun, Dec 3, 2023 at 12:28?PM Dieter VK3FFB (group owner) <dpelz@...> wrote:
Hello Hans
did you do a "master calibration" as described on page-12 of the manual ? The data of the "current calibration" on page 11 is lost when the unit is switched off (page 11, last par). This might explain your problem with a 25 Ohm load.?

I am not aware of using electrical length (delay) data in the VA5 calibration. Maybe someone else can answer that question. If the electrical length of the calibration standard is small, it will only affect measurement accuracy at relatively high frequencies. Certainly not a problem on HF.

73
Dieter, VK3FFB



--
Kind regards
Hans Holtz?
+61 490 862 614

1 - 3 of 3