Specifications

RUSKA 7250, 7250i, 7250xi & 7250LP
Users Manual
6-2
3. Press Electrical [F1]. The electronics self test will run and display the results.
4. Press PREVIOUS to return to the previous screen.
The electronics test runs eight sets of tests on various parts of the electronic modules.
Table 6-1 describes these tests and the possible actions needed if a test fails. The
pneumatics test runs nine tests on the pneumatics module.
Table 6-1. Electronics Self Test
Test Description Action on failure
Processor Tests the processor chip Replace processor board.
Clock Tests the real time clock Replace processor board.
Control Tests operation of the control board Replace control PCB
Removing the Calibrator’s Cover
The RUSKA 7250 should be kept clean and completely assembled at all times. Operating
the Calibrator without its cover affects the Calibrator’s thermal gradients and therefore
may reduce precision. If it becomes necessary to remove the RUSKA 7250’s cover,
follow the instructions below.
WX Warning
The RUSKA 7250 should only be opened by qualified
electrical/mechanical service technicians. Lethal voltages are
present and exposed in the power supply and display.
1. Turn off the RUSKA 7250 and disconnect the power cord from the Calibrator.
2. Locate and unscrew the four screws that secure the cover to the back panel.
3. Place your hands near the middle of the cover and slide the cover towards the
Calibrator’s back panel.
4. Lift up on the cover. With the cover removed, use typical electronic cleaning tools to
remove any accumulated dust from inside the instrument.
5. Replace the cover before resuming operation.
Moisture Filter
The Bourdon tube sensor is hydroscopic. An external desiccant filter prevents
introduction of moisture and is strongly recommended for high humidity areas. The filter
should be replaced annually. The moisture filter is used with the reference port only
(absolute only instruments do not need a moisture filter).
Particle Filters
Refer to Appendix A for air supply quality requirements. During normal operation, the
RUSKA 7250 transfers gas both into and out of the device under test (DUT). When
necessary, the user is expected to use and maintain an in-line disposable particle filter to
protect the Calibrator’s pneumatics from any contamination that may exist in the DUT.