Fluke Biomedical 35080B - Manual (Page 12)

35080B
Operators Manual
2-2
Figures 2-1A & 2B show suggested oscilloscope settings for the 50-150 kV range using the Wide Range
Filter Pack (37617).
1. Insert the Wide Range Filter Pack (37617) into the Model 35080B kVp Divider and connect the kVp
divider to the oscilloscope.
2. Set the oscilloscope gain to 0.1 V/div, DC Coupled. This setting corresponds to a 10 kV/div
sensitivity.
3. If making kV measurements from 50 to 120 kV, set the FUNCTION switch of the kVp divider to the
OFF position and adjust the oscilloscope vertical position control so that the oscilloscope trace
coincides with the bottom horizontal line on the screen, which corresponds to 40 kV. Then set the
FUNCTION switch of the kVp Divider to the ‘‘CAL’’ position and verify that after a delay of several
seconds the trace on the oscilloscope coincides with middle horizontal line on the screen, which
corresponds to 80 kV. When switching to the ‘‘RUN’’ position, a slight offset may be noted on the
oscilloscope. Do NOT readjust the oscilloscope trace to compensate for this offset. Refer to Figure
2-1A.
4. If making kV measurements from 120 to 150 kV, set the FUNCTION switch of the kVp divider to the
‘‘CAL’’ position and adjust the oscilloscope vertical position control so that the oscilloscope trace
coincides with the bottom line on the screen, which corresponds to 80 kV. Refer to Figure 2-1B.
If the accuracy of the Model 35080B kVp Divider is
in question, the output voltage may be checked
with a ± 0.1% DVM. The proper CAL voltage is on
the filter pack label. The allowed tolerance is ± 1%.
A 1% error will cause at most a 0.75% error in the
kV reading.
1A) 1B)
120 kV
160
kV
110 kV
150
kV
100 kV
140
kV
90 kV
130
kV
80 kV CAL at 80
120
kV
70 kV
110
kV
60 kV
100
kV
50 kV 90 kV
40 kV ZERO at 40 80 kV CAL at 80
Sensitivity 10 kV/div
Scope setting 0.1 V/div
Sensitivity 10 kV/div
Scope setting 0.1 V/div
NOTE