Reviewing data, Zooming and conditioning data, Customizing – Monarch Instrument DC1250 User Manual
Page 6: Triggering
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1.2 REVIEWING DATA
One of the biggest features of this recorder is its ability to show historic data and trends.
The data on the graphics screen can be rewound like a tape recorder, scrolling back in
time, displaying past data on the screen while still recording data in real time.
The data can also be compressed on screen, showing a whole day or week's worth of
recording on one screen, enabling trends or irregularities to be spotted easily. A data cursor
can be moved around the screen to uniquely identify samples in both time and amplitude.
Refer to
for the specifics on reviewing data.
1.3 ZOOMING AND CONDITIONING DATA
The recorder acquires data with greater resolution than can be displayed on the screen.
The user has the ability to ZOOM in to amplify the data either 2 or 4 times, equivalent to
using a magnifying glass on the display. These ZOOM windows can be scrolled up or down
to cover the entire data spectrum. The vertical scale automatically adjusts to the zoom level
and position to enable resolution of minor changes in input signal.
The recorder also acquires data at a rate faster than what may be displayed on the screen.
The user can set the sampling rate from 100 samples per second down to 1 sample every
10 minutes. When sampling slower than 100 samples per second, the recorder can be
programmed to record the average, maximum or minimum values. Thus if a sample rate of
1 sample per minute is chosen, the recorder will still sample internally at 100 samples per
second while computing the average or detect and store either the maximum (peak) value
or minimum (valley) value, depending on the mode programmed. It will then store this
value when the minute is up. Unless required otherwise, it is recommended that the
average value be used for recording since this will tend to filter or smooth the data. See
Menu for details.
1.4 CUSTOMIZING
There are many operating features and parameters that the user can program. All settings
are stored in nonvolatile memory and are recalled each time the unit is powered on. The
display can be scaled to read in engineering units, and the trace can be labeled accordingly
with up to three alphanumeric characters. Four alarms are fully user programmable and
can be associated with either channel or the external input. The Alarm levels can be set in
the engineering units of the display, the sense of the alarm, the type and the deadband or
hysteresis can be individually set for each alarm. Optional relay outputs can be assigned
independently to each alarm. A reset delay feature is also available.
There are other features which may be programmed by the user including the time
stamping mode, either real time or elapsed time, clock update rates, file names, beeper
operation etc. (Refer to
1.5 TRIGGERING
The recorder has the ability to change sampling speeds and stop or start recording as a
result of a triggered event. This event may be tied to any of the four internal alarms or
optionally to an external signal. This enables the unit to monitor a process without recording
or to record at a slow speed to conserve card space. When an external event or internal
alarm condition occurs, the unit will begin recording or change to a higher sample rate for
the data of interest.