LUDLUM MODEL 3 Technical Manual page 11

Model 3
Ludlum Measurements, Inc.
Technical Manual
The same needle indications on successive ranges would be:
A typical dual scale (two arcs) meter face is shown below. The top scale
reads 0-2 mR/hr. The bottom scale also reads 0-2 mR/hr and is for ×100
only scale. The ×100
switch is in the ×100 range. The meter face also has a
on the dial.
If the needle is pointing as indicated below and the range selection switch
is on the ×0.1 scale, then the reading is 0.1 mR/hr.
The same needle indications on successive ranges would be:
×1 = 3.5 kcpm (or 3500 cpm)
×10 = 35 kcpm (or 35,000 cpm)
×100 = 350 kcpm (or 350,000 cpm)
scale will work correctly when the multiplier
ONLY
×1 = 1.0 mR/hr (or 1000 µR/hr)
×10 = 10 mR/hr (or 10,000 µR/hr)
×100 = 70 mR/hr (or 70,000 µR/hr)
Page 2-4
Section 2
position
BAT TEST
April 2016