Front Panel Cha
ter Three: Hardware Overview
32
Display Area
The display area displays the pressure reading. It can also display the software version and the
percentage of power supplied to a transducer heater. Additionally, when you press a mode key
( [
SETUP
] [
CAL
] or [
ZERO
] ) or the [
TRIP POINTS
] key, the display area changes to list the
menu entries.
Trip Point LEDs
The trip point LEDs illuminate when the pressure reading deviates from the region defined by the
trip point high and low entries. The LEDs are extinguished when the pressure reading is within
the boundaries defined by the trip points.
Range Selector Keys
The 670 instrument uses the following ranges: x1, x0.1, x0.01, or autoranging. (This selection
effects the displayed value, the value reported by remote communications, and the pressure
output signal.) A small green light in the upper left-hand corner of the range key illuminates to
indicate the active range. Both the
AUTO
key and the active range key illuminate while
operating in the autoranging mode.
For more information, refer
The [AUTO] and Range Key
, page
64
.
Channel Selector Lights
The channel selector lights illuminate to indicate the selected channel. When the 670 instrument
is connected to a single transducer, “Ch 1” is always illuminated, and neither front nor rear panel
commands to change the channel will be accepted. When the 670 instrument is connected to a
274 multiplexer, data from up to three channels can be displayed individually. Simply push the
appropriate channel key to select the active channel.
Cursor Key
The [
CURSOR
] key is only active in menus that require you to enter a numeric value. Pressing
the [
CURSOR
] key moves the blinking cursor from left to right on the screen. Once the blinking
cursor reaches the rightmost digit and you press the [
CURSOR
] again, the blinking cursor will
return to the leftmost digit.
Adjust Knob
The Adjust knob is only active in menus where you must select the entry from a list of choices.
Turning the Adjust knob scrolls through any options available for entries that contain lists, or it
scrolls through numbers for numeric entries.
Arrow Keys
The arrow keys ( [
] and
[ ] ) allow you to scroll through the menu screens. The
arrow keys have no function when the 670 instrument is not in a menu.
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