Rear Panel Operation; Ac Power Input; Amplifier Power Output; Battery Charger - Stanford Research Systems SR570 User Manual

REAR PANEL OPERATING SUMMARY
The SR570 rear panel is pictured in Figure 3.
Various interface and power connectors are
provided, along with fuses and charger status
LEDs.

AC Power Input

The power entry module contains the receptacle
for the AC line cord and fuse. The line fuse
should be a 1 A "slo-blo" for 100/120 VAC
operation, or a 1/2 A "slo-blo" for 220/240 VAC
operation.

Amplifier Power Output

The -12 V, +12 V, and AMP GROUND banana
jacks provide external DC power up to 200 mA
for use as a bias source referenced to the
amplifier's floating power supplies.
The CHASSIS GROUND banana jack is
provided to allow the amplifier's ground to be
referenced to the chassis. If the unit is
connected to an AC power source via a three
prong grounding plug, the chassis ground is
Figure 3: SR570 Rear Panel
connected to the AC line ground conductor.

Battery Charger

Two 3 A "slo-blo" fuses protect the battery supply
and charging circuitry. If these fuses are blown,
battery power will be unavailable, and charging of
the batteries will not be possible.
When both the positive and negative supply batteries
are dead, the red CHARGE LED will be on brightly,
and the batteries will be charging at a fast rate.
When the batteries approach a fully charged
condition, the charging current will be reduced to a
trickle charge to maintain the batteries. Because the
batteries charge at different rates, the indicators on
the rear panel can reflect the charge status of the
positive and negative batteries independently. When
one set of batteries switches to the "MAINTAIN"
mode, the red CHARGE LED will be reduced to half
brightness, and the yellow MAINTAIN LED will
turn on at half brightness. When both batteries
switch to "MAINTAIN", the red CHARGE LED
will turn off and the yellow MAINTAIN LED will
be on full brightness.
7
Operation and Controls