Conditions that Prevent Data Taking and Their Circumvention

In the continuum mode, only a position error will cause data-taking to pause, whereas in the spectral line mode any of the conditions listed below will halt data-taking until the error condition is removed or circumvented:

not on position

If either the Az or El position error is larger than the amount set by the TOL command, data-taking will stop and wait for the error to drop back within tolerance. When the position error is out of tolerance, the errors displayed on screen 1 will flash. Current setting is displayed in millidegrees at bottom of screen 1.

rcvr out of lock

If the phase lock loop in the local oscillator system is out of lock, a message and bell are displayed on the Tek4023.

total power out of range

During a spectral line observation, if the DVM panel meter reading differs from its reading at the start of data-taking by more than the tolerance set by TPTOL , then data-taking will stop, and a message will be output.

Audio alarms are installed in the control room and living area that can be used to warn the user when no data has been stored on disk for n minutes. Typing ALERT n causes the tracking program to watch the current scan number. If this does not change within n minutes, the alarm sounds. To turn off the alarm, either type ALERT n to start over again or ALERT 0 to turn off the alert software.