MIL-PRF-1/1388G
TABLE I. Testing and inspection - Continued.
(e)
Count SBRS for 100,000 counts minimum in the same position at 1,300 V dc and determine and record count rate in
counts per minute (cpm). Count rate N1 equals total count divided by counting time in minutes minus background.
(f)
Count SBRS for 33,333 counts minimum in the same position at 1,400 V dc and determine and record count rate in
counts per minute. Count rate N2 equals total count divided by counting time in minutes minus background.
(g)
Count SBRS for 100,000 counts minimum in the same position at 1,500 V dc and determine and record count rate in
counts per minute. Count rate N3 equals total count divided by counting time in minutes minus background.
(h)
Determine plateau slope in percent as follows: Percent per 100 V dc slope equals 100 times (N3 minus N1) divided by
the quantity (N3 plus N1). This result shall be less than or equal to ± 3 percent per 100 V dc.
The measured count rate N2 shall be within ± 10 percent of the quantity, (N1 plus N3) divided by 2.
(i)
16/
Each tube shall be packaged in a container capable of withstanding pressures in the range of 87.3 to .760 mmHg.
17/
Spurious pulses of amplitude greater than four volts shall not occur after four minutes of operation.
18/
A new Geiger-Mueller tube (one that has not been used for a month or more) should be counted at 1,400 V with standard
reference source SBRS on shelf in position 1 of the tube-mount assembly for 15 minutes before starting voltage is measured.
19/
Starting voltage test circuit:
20/
The manufacturer, with the approval of the qualifying activity, may perform this test on a periodic basis, versus performing the
test on every lot. Approval will be based on demonstrating to the qualifying activity the capability of the design to meet this
requirement. If the design, material construction or processing of the tube is changed or if there are any quality problems, the
qualifying activity may require resumption of the original testing frequency. This allowance does not relieve the manufacturer
from meeting the test requirements in case of dispute.
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