Dwyer 490 - Manual (Page 3)

Page 3
Memory Function
A memory function is included in the Model 490 that allows you to store up to 40 pressure
readings for later review or recording. This feature is especially valuable for multipoint pressure
measurements. The readings are stored in non-volatile memory so they will be retained even if the
unit is shut off or the battery is removed.
Storing Pressure Readings
To store a reading, press and hold the HOLD/MEMORY until ST01 is displayed then release the
key. Next, press ZERO/STORE key to save current reading to ST01 memory location. A beep will
sound indicating that the reading has been saved. As each reading is saved, the memory location
display will advance to the next number. To resume pressure measurement, press the
HOLD/MEMORY key again. Note that in the memory mode, the display zero function is not available.
To zero the display, you must first exit the memory mode and then press the ZERO/STORE key.
Viewing Stored Readings - Selecting a Location
To view the contents of memory, press and hold the HOLD/MEMORY until RD01 is displayed then
release the key. Next, press UNITS/LOC to view other memory location. To resume pressure
measurement, press the HOLD/MEMORY key again.
Clearing Memory
To clear the contents of memory, press and hold the HOLD/MEMORY until CLR is displayed then
release the key. Next, press ZERO/STORE key to clear all previously stored readings. During this
operation - - - - will be displayed. Once memory is cleared, the current pressure will be displayed.
Exiting Memory Mode
To exit the memory mode, press the HOLD/MEMORY key again and the unit will return to normal
operation.
Dampening Function
The dampening feature allows the user to enter a dampening number from 1 to 16 (default value
= 2). Entering a larger number increases the amount of readings that are averaged for each display
update.
In order to access the dampening feature, follow the instructions below:
1. Press and hold the HOLD/MEMORY button. The upper right portion of the LCD scrolls through a
menu selection (HOLD, STO1, RD01, CLR and DAMP). When “DAMP” is shown, release the
HOLD/MEMORY button. This selects the dampening feature.
2. Once “DAMP” is selected, a number is shown in the upper right portion of the LCD, along with the
current pressure reading. This number is the dampening number. Adjust the number up by pressing
the ZERO/STORE button or down by pressing the UNITS/LOC button. The LCD update rate slows
as the number increases from 1 to 16. Therefore, for best results, choose the smallest number that
provides a stable pressure reading.
3. Once the pressure reading is stable, press and release the HOLD/MEMORY button to store the
dampening value.
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