impedances CY Tan amp J Dey 05 July 2016 Reminder of Physicists CST and Engineers Rs definition To be consistent I will always call the physicists definition of shunt impedance as ID: 590134
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Slide1
Checking Anode and Shunt impedances
C.Y.
Tan & J.
Dey
05 July 2016Slide2
Reminder of Physicists (CST) and Engineer’s Rs definition
To be consistent, I will always call the physicist’s definition of shunt impedance as
R
s
’ while the engineer’s definition is always
R
s
.Slide3
Problem with k definition shown in last talk
Problem is with dividing
V
acc
which is
rms
with
V
anode
which is peak
Therefore, the
k
value plotted last time is Sqrt(2) too small!Corrected step up is shown here.Slide4
What about Z
anode
shown the last time?
Using
incorrect
definition here!
Fix incorrect definition by multiplying by
sqrt
(2)
Fortunately,
Z
anode
is the one that we use for calculating anode impedance (Engineer’s definition). So the graph from the last time does not change!Slide5
Load lines and efficiencies
We can power the tube with good efficiency.Slide6
With the correct definitions to compare rms to peak formula cheat sheetSlide7
Comparing Gennady’s and my formulae
Translating to my notation:
Gennady’s
(corrected) formula
My formula
Comments
R
sh
R
s
’=2
R
s
Gennady’s
R
sh
is physicist’s definition
P
loss
=
V
acc
2
/
R
sh
P
loss
=
V
p2/2RsPloss is rms in both cases at the gap. Both Vacc and Vp is peak.Ploss = Vanode2/ZanodePloss = Van2/2ZanBoth Vanode and Van is peak.Vacc(rms)/Vanode(rms) = kVp/Van = krms/rms and peak/peak here.Zanode = Rsh/k2Zan = Rs/k2Note that Zanode = 2 Zan
Summary:
R
sh
= 2
R
s
Z
anode
= 2
Z
an
Everything works as long as Gennady sticks to
rms
, while Joe and I stick with peak.