Farnell TSV 70 - Page 10

Rl12 which is connected between the "+ SENSE" and "-SENSE"
terminals. The Voltage at the base of VTl02 is therefore
at half the output terminal voltage. The action of the
loop is to maintain zero voltage between the bases of vT101
and 102, and hence the output of regulator VT24 - 30 is
The terminal output voltage is controlled by circuit
board No. l, and since switch SlB is closed on this range,
the output voltage is now specified
Vo = VZ3
where
General:
(R8/7 T2)
(R8 /7 T2)
Vct
R8//2
since R113 and Rll2 are equal
Vct =
(R9
+
Vo
by:
The voltage Vot at the output of regulators VT24 30
is controlled by circuit board No.2 and is specified by:
R1l3
R112 + R113
(Pl + P2)
+ T1)
R9 + T1
-6 -
R8 T2
R8 + T2
Vo
Tl03 and Tl04 are setting potentiometers to adjust
the amme ter full scale deflection.
Tl0l and l02 are
setting potentiometers to adjust the voltme ter full Scale
Thermal trip TTl is a bi-metallic switch which is
located on the heat sink assembly. Its purpose is to
detect excessive temperatures on the series regulator
elements, which could be caused by obstruction of air flow
in the fan cOoling system or by fan failure.
controlled at half the terminal output voltage.
deflection.