Model 12-4 Technical Manual Section 4
Ludlum Measurements, Inc. Page 4-2 May 2016
RES Pushbutton: When depressed, this button provides a rapid means
of driving the meter needle to zero.
Toggle Switch: provides meter response. Selecting the fast, ˝F˝ position
of the toggle switch provides 90% of full-scale meter deflection in four
seconds. In the slow, ˝S˝ position, 90% of full-scale meter deflection
takes 22 seconds. In the ˝F˝ position there is fast response and large
meter deviation. The ˝S˝ position should be used for slow response and
damped meter deviation.
HV Pushbutton Switch: When depressed, displays the detector high
voltage on the meter. The output resistance of the high voltage-supply is
1.5 megohms with a typical scintillation voltage divider of 100 megohms.
The actual detector voltage will be 98.5% of the indicated voltage.
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