PROTOR Redhat : Installing TELNET server on Redhat

By default the RedHat 7.2 installation will not allow a remote user to connect to the system using TELNET for security reasons. It is probably safest to leave the system like this and use an encrypted connect facility such as SSH. However if you do wish to allow TELNET access then you need to do the following.

Install the telnet-server RPM from the RedHat installation disk #1 either using a suitable package manager to use the following command line:

rpm --install --replacefiles --nodeps
/mnt/cdrom/RedHat/RPMS/telnet-server-*.i386.rpm

This installation creates a file telnet in the directory /etc/xinetd.d . Edit this file and change the line

disable = yes

to

disable = no

Restart xinetd by the command

xinetd restart

Measuring Shaft Displacement Using A PROTOR System

The measurement of shaft displacement is an important vibration measurement for rotating machines. Shaft displacement is usually monitored by non-contact shaft displacement probes that produce a voltage proportional to the distance of the shaft surface relative to the tip of the probe. Ideally two shaft displacement probes will be fitted to measure the displacement in both the horizontal and vertical directions. Actually the probes do not have to be exactly horizontal and vertical as Prosig’s PROTOR system is able to resolve into the horizontal and vertical directions.

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PROTOR Redhat : Installing XDM

By default the RedHat 7.2 installation uses the GNOME Display Manager GDM or possibly the KDE Display Manager KDM. Both these Display Managers are very powerful and allow users to select the type of session to start ( such as GNOME or KDE ). There are also options and menus to shutdown or reboot the system. For a PROTOR installation where we want to control the users session then using the basic XFree86 display manager XDM is preferable.

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PROTOR Note : Booting Linux using NT Loader

In some configuration it may be required or desirable for Linux and Window NT to co-exist on the same system. Presuming Windows NT has been initially installed then the system will boot through the Windows NT Boot Loader. Assuming that a Linux system has been added to a spare partition or additional disk then the requirement is to add an option to the NT Boot Loader such that either Windows NT or Linux may be booted.

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Importance of tachometer/keyphasor signal conditioning and its relationship to phase measurements

This note describes the importance and setup of a keyphasor or tachometer signal for PROTOR Remote Monitoring Data Acquisition System (RMDAS) units. RMDAS units are provided with manual tachometer conditioning control. The note describes the control functions and there effect on the conditioned tachometer signal, it also describes the relationship between phase measurement and keyphasor triggering.

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