Martel Electronics BetaGauge 3II - Manual (Page 52)

3-17 Basic Operations
Pressure Source Adjustment
Perform the following tasks to adjust the pressure
source prior to starting a pressure trip test:
1. Learn the direction (low-going or high-going) in
which the trip will occur and approximately where
the device is expected to trip (in terms of pressure).
2. Use the coarse adjustment control of the pressure
source to set the pressure 5 to10% away from the
trip point.
3. Use the fine adjustment control of the pressure
source to ramp through the expected pressure trip
point.
Pressure Signal Ramping
The slower you ramp the pressure signal, the more
accurate the captured trip value will be. This is due not
only to the response time of the pressure trip
instrument, but also to the operation of the BetaGauge
II. The BetaGauge II takes a pressure reading three
times a second, and in between these pressure readings,
it performs background tasks such as monitoring the
keyboard, updating the display, monitoring temperature,
and performing internal calibrations and checks.