Sigma BM-286A service manual Operator Maintenance

5. MAINTENANCE page 33

5.MAINTENANCE

5.1.OPERATOR MAINTENANCE

The slide tracks on the weight scale platform should be greased monthly. The hinges and door latch do not require lubrication.

5.2. CALIBRATION

The electronic circuitry has proven to be very stable over long periods of time. However, the following calibration should be performed at least annually to ensure reliable operation and accurate measurements. There is a Calibration Checklist (5.5.) at the end of this section. Copies should be made, and filled out each time the system is calibrated.

NOTE:

The high voltage affects the pulse amplitude, so the high voltage must be tested before

the RCS-110 amplifiers are calibrated. This procedure should be performed only by qualified personnel!

Calibration equipment required:

DVM with 10MÛ input impedance

Oscilloscope with >20 MHz bandwidth

Test Source (5-12 µCi of 137Cs)

Remove the right side face plate to gain access to the RCS boards. Refer to"BM-286A Pictorial View (Door Open)" Drawing 2 (Appendix F.).

Model BM-286A