On Sat, 12 Oct 2019 at 05:53, Larry Benko <xxw0qe@...> wrote:
Dave,
Please educate me. Suppose I build a product that has a SMA-F connector
on it and you and I are going to measure S11 for my product. The only
way we are able to get the same answer is if there is an agreed upon
definition as to where within the mated SMA connectors we are going to
call the reference plane. Agreed?
The MIL standard for the SMA connector defines the reference plane.
The most accurate way to calibrate my measuring equipment is to connect
a cable to it that is terminated in an SMA-M connector and then
calibrate it with calibration O/S/L standards that have SMA-F
connectors. This eliminates any adapters being needed. Agreed?
Yes. agreed.
Since my O/S/L standards have some physical length I will need to move
the reference plane closer to the measuring equipment by some small
amount. To my way of thinking this can be done either by the measuring
equipment automatically of manually by doing some line extension.
Is this incorrect?
*No, that¡¯s wrong.*
You should
1) Configure the 8753 to use the 85033D coefficients. From memory, that¡¯s
something like
CAL (physical button on 8753)
Select Cal kit (soft key)
Press the soft key corresponding to the 85033D.
Return
Now just calibrate the instrument properly, then make your measurement.
There¡¯s no need to mess around adding any delays - as Alan pointed out,
that will screw your results up
Larry, W0QE
Dave, G8WRB
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United
Kingdom
