MAX 4000 PLUS ELECTROMETER 5
1 General Operation
1. Unless operating on battery power, connect the detachable AC power cord to the provided
Globtek®, Inc. power supply, attach the AC power cord to a grounded 120 VAC or 220/240 VAC
50/60 Hz power outlet, and connect the power supply to the MAX 4000 Plus Electrometer
power adapter input.
2. With nothing connected to the input connector of the MAX 4000 Plus, turn the power on
and wait at least 10 minutes for the electrometer to warm up.
3. Select the desired Range of Operation, Low or High, with the arrow buttons, followed by the
MODE/ZERO button.
NOTE: For best performance, select the lowest range possible for the intended measurement.
4. Press the Start button to perform the electrometer zero adjustment. This will take about
one minute.
5. Connect the ionization chamber to the MAX 4000 Plus and select the desired voltage bias.
Allow at least 10 minutes for the system to stabilize.
6. Verify the leakage of the ionization chamber is within the manufacturer’s stated acceptable
limits.
7. Press and hold the MODE/ZERO button and repeat the zeroing process in Step 3, but with
the ionization chamber connected. This is the system zero adjustment.
8. Check the system leakage. Take a reading without exposing the chamber to radiation. This
reading should be less than 0.1% of the final signal expected.
9. Measure the atmospheric temperature and pressure.
10. Turn on or insert the radiation source(s) and take at least 3 measurements. Further
explanation of the Range, Trigger, Rate, Charge, and Rate/Charge modes can be found on
pages 5-8.
11. Analyze the data taking into account the average of the readings, system leakage,
temperature/pressure corrections, calibration factors and any other appropriate corrections to
be made.
12. When all measurements are completed, set bias voltage to 0 VDC, turn off the MAX 4000
Plus and disconnect the ionization chamber.
13. If using the power supply and if desired, disconnect the power supply from the MAX 4000
Plus and disconnect the detachable AC power cord from the power supply.
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