Inputs And Interface; Front Panel Connectors; Chassis Ground - Arbiter Systems Portable Power Sentinel 933A Operation Manual

2.3.1

Inputs and Interface

Front Panel Keys
The 933A has thirty front-panel keys with the following general uses:
ˆ Soft Function Keys (5)
ˆ Dedicated Function Keys (8)
ˆ Cursor control with Enter key (5)
ˆ Numeric keypad (12)
2.3.2

Front Panel Connectors

Connectors on the 933A have the following purposes:
ˆ Current (C) and voltage (V) input; (C) 4 (933A-03), 6 (933A-01),
16 (933A-02), (V) 4
ˆ Ground/safety lug, banana
ˆ Multiconductor GPS Timing Input; capped when not in use
ˆ IRIG-B Timing Input connector, BNC
ˆ USB 1.1 serial I/O communications
ˆ RS-232C serial I/O communications, RJ11
ˆ Multiconductor Auxiliary I/O; capped when not in use
ˆ IEC-320 inlet power receptacle, with fuse compartment
2.3.3

Chassis Ground

A ground lug is located in the upper right portion of the front panel. This
terminal is connected to the instrument chassis, and also to the safety
ground lead of the AC power connector. When the Model 933A is operated
with the power line cord connected, the chassis of the instrument will be
connected to the safety ground for the AC outlet. However, when operated
from the internal battery with the power cord disconnected, the chassis will
be floating.
The purpose of the ground lug is to allow the chassis to be tied to a
safety ground, especially during battery operation.
CAUTION: Do not use a 3-to-2 prong plug adapter on the ac
power cord. This will isolate the safety ground on the instrument from
a ground point and cause a dangerous condition.
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