Measuring
44 MC4 User Guide
Notes.
For more information on pressure measurement and internal/ex-
ternal pressure modules, see chapter Things to Consider when
Measuring Pressure on page 110.
For information on creating custom pressure units, see Part C,
chapter Custom Pressure Units on page 108.
When using high pressure modules, you may measure pseudo
absolute pressure. Open the setup window (select F1/
Setup
or
F2/
Setup
), change the pressure type to absolute. Then an extra
field for entering the barometric pressure appears. Enter the
barometric pressure manually and press F3/
Ok
. MC4 adds the
manually entered barometric pressure to the measured gauge
pressure and displays the (pseudo) absolute pressure
Connecting and Disconnecting External Pressure Modules
An external pressure module may be connected and disconnected at
any time. If a removed module was part of an active measurement,
MC4 emits a "bleep" to inform you of the fact that the external
pressure module used for pressure measurement was removed. The
window where the external pressure measurement was configured
reverts to "None/No Function". This happens even if the external
pressure module was used as the secondary measurement in a
special measurement.
External Barometric Module Specifics
If MC4 includes an internal barometric pressure module and an
external barometric module is connected, the following rules apply:
For most cases: When the external barometric module is
connected to MC4, it supersedes the internal barometric
module.
Exception: If the internal barometric module is used in
conjunction with a gauge module (Pressure Type is Absolute)
and the external barometric module is connected, then MC4
continues to use the internal barometric during that
measurement session.
Disconnecting: When the external barometric module is
removed, any measurements utilizing it are stopped. Restarting
the measurement takes the (possible) internal barometric
module in use.
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