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2620A, 2625A
Users Manual
2-16
Using the Monitor Function
The Monitor function repeatedly measures the displayed channel. Press M to activate
the Monitor function. Use G and D to change the monitored channel; undefined
channels (those set to OFF) are automatically skipped over.
Since the instrument cannot take measurements on a channel that has not been set up, it
responds with a long beep if you try to activate the Monitor function on a channel that is
defined as OFF. Press G or D to find a channel that has been set up, then activate the
Monitor function. If all channels are defined as OFF, you must first set up one or more
channels before activating the Monitor function.
Note
The Monitor function does not update data in the Review array, an
Autoprint listing, or data memory (2625A). These values are updated only
with measurements taken by the Scan function.
Using the Scan Function
The Scan function takes measurements at the specified interval on all defined channels.
Pressing Q to activate the Scan function causes all defined channels to be measured in
sequence. This cycle repeats at the specified scan interval. When Q is pressed a second
time, the Scan function is turned off, and the instrument returns to the Inactive Mode.
Note
During a scan, a channel set up with autoranging will momentarily slow
the scanning rate whenever the correct range must be determined. This will
occur during the initial scan; the instrument remembers the range for
subsequent scans. Scans then occur at the normal measurement rate. If the
input signal later changes sufficiently, the scanning rate will again slow
momentarily while the instrument determines the new range.
If scanning is deactivated while the instrument is actually taking scan measurements, the
display changes immediately, but the full scan is still completed. The instrument always
completes a scan in progress.
You can also trigger a single scan of all defined channels. Select SINGLE (K Q) to
scan all the defined channels once.
Reviewing Channel Data
The instrument automatically stores minimum, maximum, and last-scanned values for
each defined channel. These values are stored in the Review array and are updated with
each set of scan measurements. Measurements taken by the Monitor function are not
included in the Review array.
The contents of the Review array can be called up to the display when in Active or
Inactive Mode by pressing N. The displayed channel must be defined (i.e., not OFF)
to call up Review array data from Inactive Mode; otherwise, a long beep results.
You can move around in the Review array using the arrow buttons. The access scheme is
shown in Table 2-3. Either the Review array or the Totalizer count can be displayed at
one time; you must deactivate one before activating the other.
To remove the Review data from the display and restore the previous display, press
N again, or press D.