Fluke Biomedical 35080B - Manual (Page 51)

Maintenance
Cleaning the Instrument
10
10-3
Figure 10-1. Battery Replacement for the Model 35080B kVp Divider
10.4 Calibration
The factory calibration of the Model 35080B kVp
Divider is performed with a precision high-voltage
divider and a 12-bit ± 0.1% digital oscilloscope. If
comparable equipment is not available, do NOT
attempt to make adjustments on the kVp divider.
Return the unit to the factory for adjustment.
Calibration of the Model 35080B kVp Divider depends primarily on the stability of the filter pack. (Review
Section 3, Theory of Operation.) Since the filter pack primarily consists of metal sheets, the absorption is
not expected to change with time. There are only two calibration adjustments in the kVp divider. One
adjustment (RP103) sets the gain of the ratio circuit. The other adjustment (RP101) sets the ratio of the
internal reference currents that are used as an internal calibration check when the function switch is set to
the “CAL” mode.
INTERNAL CALIBRATION CHECK
1. Set the function switch to the ‘‘CAL’’ position.
2. Insert the Test Pack (32863).
3. The output voltage should read 0.750 volts ± 1%.
WARNING