Ludlum Measurements 16, Техническое руководство

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Model 16 Analyzer Technical Manual
Section 2
Ludlum Measurements, Inc. Page 2-3 July 2011
The instrument speaker should emit
˝
clicks
˝
relative to the rate of counts
detected. The
AUD ON
/
OFF
switch will silence the audible clicks if in the
OFF
position. It is recommended that the
AUD ON
/
OFF
switch be kept in the
OFF
position when not needed in order to preserve battery life.
Rotate the range switch through the lower scales until a meter reading is
indicated. While observing the meter fluctuations, select between the fast
and slow response time ( ˝
F
/
S
˝ ) positions to observe variations in the display.
The ˝
S
˝ position should respond approximately 5 times slower than the ˝
F
˝
position.
Note:
The slow response position is normally used when the
instrument is displaying low numbers, which require a more
stable meter movement. The fast response position is used at
high rate levels.
Check the meter reset function by depressing the
RES
pushbutton and
ensuring the meter needle drops to “0.” When the
RES
pushbutton is
released the meter needle recovers to the original reading.
Depress the HV pushbutton and note that the meter indicates the high-
voltage set point.
Note:
HV power supply has an output impedance of 5.7 megohms.
HV load should not exceed 25
µ
A. Calculate the scintillation
detector loading if an exact high-voltage setting is required.
See calibration procedures for details on the
WIN IN
/
OUT
operation.
Once this procedure has been completed, the instrument is ready for use.
Operational Check
To assure proper operation of the instrument between calibrations and
periods of nonuse, an instrument operational check including battery test
and instrument test (as described above) should be performed prior to use.