Chapter Three: Hardware Overview
Front Panel
31
Chapter Three: Hardware Overview
Front Panel
Figure 6 shows the front panel of the 670 instrument. Chapter Four: Functional Overview,
page 43, discusses the operation of the 670 instrument.
Local
Remote
B
A
Cursor
Trip
Points
Ch 1
X 1
Ch 2
X 0.1
Ch 3
X 0.01
Cal
Auto
Zero
Type 670
Signal Conditioner
Menu Adjust
Parameters
Enter
Setup
Display Area
Key Lock
Switch
Arrow Keys
Adjust Knob
Trip Point LEDs
Channel Selector
Keys
Range Selector
Keys
}
Figure 6: The Front Panel
Key Lock Switch
The position of the Key Lock switch determines whether the 670 instrument operates under front
panel (Local) or remote communications (either RS-232 or IEEE-488; and TTL logic) control.
When the Key Lock switch is in the
LOCAL
position, the 670 instrument responds to
commands entered through the front panel. It will respond to status requests only, not
commands, sent through remote communications. Additionally, it will not accept TTL
commands issued to the rear panel connectors. When the Key Lock switch is in the
REMOTE
position, the 670 instrument responds to commands sent to it through the serial port, the
IEEE-488 bus, or the rear panel connectors. The front panel can display status information
only — it cannot be used to enter commands. The front panel controls are locked as a safety
measure to prevent accidental command entries.
The key can be removed from the unit when positioned in the
REMOTE
position. It cannot be
removed when positioned in the
LOCAL
position.
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