Dwyer DH3 - Manual (Page 19)

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rESO (Resolution) SUB MENU
The DH 3 is capable of displaying four digits of resolution. However, at very low
pressures the instability of the pressure may cause fluctuations in the least
significant digit causing the least significant digit to be of little value.
Three digit resolution (
3DIG ) can only be active when there is at least one digit to the
right of a decimal.
3DIG - Set display for 3 digit resolution
4DIG - Set display for 4 digit resolution
Pd.S (Process Display) SUB MENU
STD - Display reads pressure, velocity, or flow values
PCT - Display reads % of full scale value
When the display is reading percent, PCT is displayed in the upper right of the
display. The percent display is only available in pressure operation.
DAMP (Dampening) SUB MENU
Adjust from 1-16
Dampening stabilizes the display from instabilities due to things such as vibration and
excessive pressure fluctuations. The dampening setting adjusts the amount of
readings that are averaged for each display update. Adjust the dampening value until
the display reads a stable value for the application.
AdU (Advanced) MAIN MENU
POL - Process output low ZERO - Zero calibration
POH - Process output high SPAN - Span calibration
MSP1 - Maintenance set point 1
MSP2 - Maintenance set point 2
POL and POH (Process Output Low and High) SUB MENUS
This feature is used in pressure operation only.
Process output low and high are used to scale the 4-20 mA output. Set POL to the
desired display reading for 4mA output, and set POH to the desired display reading
for 20 mA output. POH must be higher than POL . POL may be adjusted 2% BELOW
minimum scale up to POH . POH may be adjusted from POL to 2% ABOVE maximum
scale.