Fluke RUSKA 7350 - Manual (Page 64)

RUSKA 7350
Users Manual
6-2
WX Warning
The RUSKA 7350 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 7350 and disconnect the power cord from the power supply.
2. Locate the 14 screws on back and side and two screws on top of cover that secure the
cover to the chassis.
3. Unscrew these screws.
4. Remove the cover.
5. Replace the cover before resuming operation.
Processor Battery
The processor board uses a lithium battery to maintain time and date information. This
battery has a varying life. If the instrument is left on 24 hours a day, it will last 5-10 years.
If the instrument is stored, it will last one year. It is recommended to replace it every year.
To do this, follow the instructions below:
1. Remove cover, see Chapter 6, Removing the RUSKA 7350’s Cover section.
2. Remove the cover of electronic chassis located at the front right corner.
3. Remove processor card by removing one screw and rocking upward.
4. Remove battery, a round silver object, by carefully pulling on battery while
holding card.
5. Plug in new battery (part no. 4-725).
6. Reassemble in reverse order.
7. The time and date may have to be re-entered. See subsection Chapter 4, Date/ Time
section.
Calibration
To keep the RUSKA 7350 operating within its specified accuracy (Appendix A), the
calibration procedure described below must be performed every year. Use appropriate
DWG, such as Model 2475.
Note
The calibration procedure automatically generates coefficients which are
stored in memory on the RUSKA 7350’s Control Board (Chapter 2). If
these constants are “lost” for any reason, the calibration procedure must
be performed, regardless of the last calibration date. If the calibration
coefficients are known, they may be restored to the RUSKA 7350 at any
time by “editing the coefficients” (See Chapter 6, Editing the Coefficients
section.)