Ectron 560H, Инструкция по эксплуатации

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Model 560H Theory of Operation
by CR1, CR4, R5, and R9. The operating point of
A2 is set by R7.
ZERO DETECTOR
Two front-panel LED indicators DS1 and DS2
allow the user to adjust the output of the amplifier
to zero without external equipment when no input
is applied to the amplifier. One or the other LED
will be lighted if the output of the amplifier is not
zero. As zero volts output is approached, the LED
will dim. When zero is reached, it will extinguish.
As the amplifier output continues through zero to
the other polarity, the other LED will light.
The output of the amplifier J1, Pin 4 is applied to
A3-b, Pin 5 through RC filter C17 and R80. The
voltage at A3-b, Pin 7 is adjusted to zero using
R81 when no output signal is present at J1, Pin 4.
If J1, Pin 4 becomes positive, A3-b, Pin 7 will be
positive, and DS1 will be illuminated. Potentio-
meter R84 adjusts the sensitivity of the detector
from 2 mV to 20 mV. (With R84 in a fully
clockwise position, the sensitivity is 2 mV.)
R513-16 ENCLOSURE (DRAWING 513 - 622)
The NULL INDICATORS switch S1, when in the
OFF position, applies

16 V to the gate of Q4 on
each amplifier (Drawing 560-602) and inhibits
indicators DS1 and DS2.
The enclosure power supplies provide ±15.9 V at
up to 1.5 A for amplifier power including 100 mA
Options K, M, and N.
E513 - 6A ENCLOSURE (DRAWING 513 - 613)
Front-panel controls are POWER S1 and ZERO
DETECTOR S2. Above the power switch is the
power indicator DS1. The ZERO DETECTOR
switch applies

16 V to the individual conditioner-
amplifiers to disable their front-panel zero detector
indicators. Power supply PS1 is adjusted for ±16 V
with a current capability of 1.5 A. It may be wired
for 120 V ac or 240 V ac. See Table 1 and Flag
Note 8 on Drawing 513-613 for fuse ratings. (PS2
supplies power for the excitation supply and is not
used by the Model 560H.)
E513 - 2A ENCLOSURE (DRAWINGS 513 - 603
AND 513 - 604)
The front panel has a power switch S1 and
indicator DS1. The rear panel has two terminal
strips TS101 and TS102 for input and output
connections. The rear panel has an access hole to
the 120/240 V ac switch S2. Refer to Drawing
513-604, Flag Note 2, for the proper fuse rating.
Drawing 513-603 shows two power supplies.
Bridge rectifier CR2 supplies plus and minus
power for U2-a and U3. These integrated-circuit
regulators supply the ±16 V at up to 0.18 A for the
Model 560H amplifier. (Bridge rectifier CR5
supplies U1 to provide

15.9 V at up to 0.2 A for
the excitation supplies, not present in the Model
560H.)
6-3