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2620A, 2625A
Users Manual
2-10
• Active Mode if this mode was in effect prior to the cycling of power. Scanning,
monitoring, or combined scanning/monitoring is resumed.
• Inactive Mode if the instrument was in Inactive Mode or Configuration Mode prior
to cycling of power.
When in Inactive Mode, the instrument shows configuration information for the
displayed channel. The channel number appears in the right display, and other
annunciators are dimly lit to show the present setup for this channel. For example, if the
channel is set up to measure ke, the "k" and "e" annunciators are dimly lit.
Alternatively, if this channel has not been set up to measure anything, the "OFF"
annunciator is lit dimly.
You can change the channel by pressing G or D.
Front Panel Display
Full descriptions of the display annunciators are presented in Table 2-1.
Reading the Display
The instrument display uses both alphanumeric characters and fixed annunciators. When
in Configuration Mode, these features are used to provide user prompting. In Inactive
Mode, they provide status information. In Active Mode, they provide both status
information and measurement data.
Information is presented on the display during both front panel control and computer
interface control. If the instrument is being controlled through a computer interface, the
display shows the results of computer-interface initiated actions (even if the front panel
controls have been disabled.)
The remainder of Chapter 2 (as well as Chapter 3) relates to front panel control of the
instrument. Refer to Chapter 4 for additional information about computer interface
operation.
Left Display
The left display has five large numeric characters to show measurement results, "otc"
when an open thermocouple is detected, or "OL" when a measurement is over range.
During Configuration Mode, the left display is also used to display the numeric values
and instrument parameters being chosen.
Right Display
The right display has five small alphanumeric characters to show the channel number,
display prompting information during setups, or to count down the scan interval.
Specific Annunciators
The rest of the display is devoted to specific annunciators, combinations of which are
used to describe the operating mode, the type of measurement being displayed, or the
type of setup information to be entered. These annunciators are described in Table 2-1
and shown in Figure 2-5.