Calculating Open-Loop Response - HP 3563A Operating Manual

Math & Auto Math
Waveform Math

Calculating Open-loop Response

T/l - T calculates open-loop response from a measured closed-loop frequency response curve, as
the example in figure 15-11
active trace.
=
Trace B T/1-T
Where T is Trace A
Real Part
REAL PART
zeros out the imaginary part of complex measurement data. This differs from the
display coo r dinate (under
the imaginary part untouched.
Trace B is Real Part of
Frequency Response
in Trace A
1 5-12
shows. To yield a valid result, the measured response (T) must be the
)(_365 . 2
Yo_17. 497"
FREO
20 . 0
d B
6 0
_ .
F,.. d
Yb_1 . 2 .. 21(\
M, FREO
, . .
dB
Figure 15-11. Calculating Open-loop Response
CaORO)
which only displays the real part of a complex block and leaves
X_50kHz
Yo-9.0.:209 dB
FREO RES P
10.0
dB
_70.0
"'>od Y
Yb .. 6.216'5 dB
M,FREO RESP
40.0
de
-120
Figure 15-12. Real Part
....
z
dB
RESP
0
..,.
de
RESP 5Avg 50""0,,,
0
49.910<
49.9k
1
P
REAL
50151<
SO,1Sk