Galvanometer Position Feedback Circuit; Galvanometer Damping - HP 7414A Operating And Service Manual

Model 7754A/7414A
Section IV
Principles of Operation
~ ! _PIVOT~
~
ARM /
TAIL PIVOT
DEMODULATOR
•
C' T
~
NET NEGATIVE
OUTPUT ON C1
+12V
-12V
• + •
CR2
TORSION
RETURN
SPRING
-,
r-
I
I
I
I
I
r
I
I
I
L
~'~~~~~
.J
SIGNAL
(TO 100 HZ)
+
Figure 4-4. Galvanometer Position Feedback Circuit
OVERDAMPED
UNDERDAMPED
4%
OVERSHOOT
~
1 _
~
-.----
::i
T
Q..
~
«
UNDERDAMPED
NATURAL CI RCUIT FRE-
QUENCY DETERMINED BY
POSITION FEEDBACK •
Sine Wave Input
FREQUENCY
Step Function Input
TIME
Figure 4-5. Galvanometer Damping
07754-1 4-5