Hi Michael:
What you describe sounds like measurement error of the MFJ unit and proof
that there is a difference between a $250 piece of test equipment and a
$10,000 unit.
Probably the greatest accuracy is when the load is 50 ohm +j0. As you
depart from that, you will see more and more error. If the purpose is to
end up with 50 + j0, then it does not matter. but, if you are measuring
something which is 336 +123, you may not even be close. I have a large old
GR bridge for that purpose.
Think ball-park rather than exact and you will be ok. You can also make a
number of calibration fixtures from known parts and use them for calibration
of your unit and/or comparison.
73, Colin K7FM
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