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RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page 72
PRINCIPLE
The [UNIT] function key makes available a choice of six default pressure units (US or SI units
depending on whether the RPM4 has been factory set as US or SI) (see Section 3.3.2).
RPM4 also supports many commonly used units other than those included in the default set up.
These units can be made available for active selection by customizing the UNIT function
using [SPECIAL], <6PresU>. This allows RPM4 to offer a very wide selection of units while
simplifying day to day operation. The typical user customizes the [UNIT] function key to
support his/her six most commonly used units.
OPERATION
To customize the [UNIT] function key, from the MAIN RUN screen press [SPECIAL],
<6PresU>. The display is:
1. Entry field to specify which unit position (1 to 6) of the [UNIT]
function key menu is to be changed.
Set up unit #6
Enter the number of the unit position that you would
like to change. The display becomes:
Unit#6 1SI 2other
3altitude 4user
Select the desired pressure unit category (SI units include units based on SI units such as
mmHg), then select the desired unit from the unit menu.
The units of measure available are listed in Table 9.
Table 9. UNIT Function - Available Units of Measure
<1SI> <2OTHER> <3ALTITUDE> <4USER>
<1Pa>
<2hPa>
<3kPa>
<4MPa>
<5mbar>
<6bar>
<7mmHg>
<8mmWa>
<1psi>
<2psf>
<3inHg>
<4inWa>
<5kcm2>
<6Torr>
<7mTor>
<1feet>
<2meters>
If <4user> is selected, the user unit must be defined. The display is:
1. Entry field.
Define user unit:
1.000000 unit/Pa
Enter the number of user units per Pascal (Pa) in the entry field. Pressing [ENT] defines the
user unit and returns to the <Set up unit #n> screen.
The user defined unit label can be customized to any alphanumeric, four character label
using the remote command “UDU” (see Section 4.4.4).
See Section 7.2.1 for the pressure unit conversion factors used by RPM4.