Ashcroft ATE-2 - Handheld Calibrator - Manual (Page 21)

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The Damping Function stabilizes a measured pressure signal.
When damping is activated, the value displayed, saved to a
Datalog or transmitted to a journal (eg. To HyperTerminal) is a
filtered value. The filtering is programmable to 16 incremental
levels, allowing the damping function to be tailored to the spe-
cific requirements of most any application. The default damping
level is 1. As the damping level is increased, additional electronic
filtering is applied and the response time is slowed. Values are
displayed on the HHC screen, and recorded by Datalogging at
the fastest update rate between 100 and 300 milliseconds, based
on how many inputs are active. As damping level is increased the
update time increases approximately 100 milliseconds per damp-
ing level. With a single pressure module installed and damping
set to maximum level 16 the display output can lag by up to 1.6
seconds from the actual process pressure. If two modules are
installed and or voltage/current monitoring is active the system
display and Datalog values lag will also increase. The longest
display lag with two pressure modules programmed for maximum
damping and the voltage/current monitor active is 4.8 seconds.
Set up of Damping Function
When in Measurement Mode:
1. Press DAMP key.
2. Press PORT SELECT key to choose Channel 1, Channel 2, or
both modules.
3. Press RIGHT ARROW and LEFT ARROW to move cursor to
desired damping level (16 possible positions).
4. Press ENTER to save the value and activate damping.
Once established in the set up MENU the damping process may
be enabled or disabled through the use of the DAMP key on the
keypad. To activate/deactivate the damping function:
1. Press the DAMP key on the keyboard.
2. Press PORT SELECT key to choose Channel 1, Channel 2, or
both modules.
3. Press ENTER to activate damping. Damping level will be
indicated below units of measure.
The HHC has two Datalogging modes, Manual and Auto-
matic. Manual mode is the default. Automatic Datalog mode is
described in MENU programmable features section 15f.
The first time the DATA STORE key is pressed following power
up of the HHC, a new Datalog file will be created. The Datalog
column headers will be labeled with date, user programmable
module description (default values are Channel 1, Channel 2,
Ext.) and the engineering unit of measure. Programming channel
and tag names are covered in the MENU driven Datalogging
set up section 15f. The first row of the Datalog will be populated
with measurements as shown on the LCD display. Subsequent
presses of the DATA STORE key will create manual data records
into this initial Datalog.
SECTION 14 f. DAMPING FUNCTION
–0.12
in H 2 0
-0.012
PSi
<----------|----->
SECTION 14 g. MANUAL DATALOG FUNCTION