MIL-STD-1330D(SH) APPENDIX D
w/ Change 1
D.8.2.2 With the dish next to (not directly under) the sensor, set the sensor so that it is slightly below the top of the evaporating dish. This setting will provide minimum movement of the sensor when sliding the dish under it.
The micrometer reading is not important and can be changed provided that the sensor is set slightly below the top of the evaporating dish so that it will sit flush on the dish when taking a reading. For information, the micrometer on
the stand can be used to set the sensor at a specified distance from the bottom of the stand. The purpose of this is to
provide a means of attaining a consistent standoff distance from the sample being measured. The sensor can be moved up from this point, but when moved back down, it will end up at this point. The application in this appendix is different in that when taking a reading, the sensor is moved up, the dish is placed under the sensor, and the sensor is placed directly on the dish. Setting the sensor directly on the dish provides consistent standoff distances for each reading and allows the dish to be aligned with the sensor.
D.8.2.3 Install all connections per the manufacturer's instructions.
NOTE 1: Erratic readings may be attributed to a fluctuating power supply, such as a cycling hot plate in the same receptacle. This should be avoided if possible.
Turn the power ON. Once the power switch is turned ON, it takes approximately 15 seconds before the software boots up and the display comes to life and it takes 15 minutes for the control unit to warm up. To adjust
the control unit settings, the SELECT button is used to cycle the display, and the UP and DOWN buttons are used to change the settings. An explanation of each item and the required setting is as follows:
1. SIGNAL: This is the initial power-on screen. The display should show a number with the word "signal" beneath it. If the words "GND SAMPLE" appear, the sample is not properly grounded. For this analysis, since the evaporating dish is placed on the sensor stand, plugging the sensor stand into the monitor will properly ground the sample (i.e., the evaporating dish). Refer to the manufacturer's instructions for making this connection. The signal is the real-time reading and does not represent the peak. This mode is not used while taking measurements for this procedure.
2. PEAK: The peak detect mode will search for the maximum OSEE signal and display it. This is the mode used for taking measurements throughout this procedure. Each reading taken per this manual is a peak reading. The units on the display are "centi-volts". Because this unit of measure is not common, the term "counts" will be used, and is commonly used by the manufacturer.
3. LOW GATE: The low gate setting can be adjusted to indicate when a reading is below established acceptance criteria. When the reading is below the low gate setting, the display will show the counts and the message "OUT LOW". This setting is not required or used in this procedure. Using the UP/DOWN buttons, set the low gate to 0 count to inactivate it and avoid confusion.
4. HIGH GATE: The high gate setting can be adjusted to indicate when a reading is above established acceptance criteria. When the reading is above the high gate setting, the display will show the counts and the message "OUT HIGH". This setting is not required or used in this procedure. Using the UP/DOWN buttons, set the high gate to 1000 counts to inactivate it and avoid confusion.
5. GAIN: The gain amplifies the signal, which can be interpreted as a multiplier for the output. There are two gain settings available, one on the sensor and the other on the control unit.
a. Sensor Gain. On the sensor, the gain setting is indicated by the number (on the outer ring of the rotary switch) opposite the dot (on the inner ring of the rotary switch). The available settings, from lowest to highest, are
1, 2, 3, 4, 5, 6, 7, 8, 9, and 0. Using the tool provided, set the sensor gain to 4. No further adjustments of the sensor gain will be made throughout this procedure.
b. Control Unit Gain. On the control unit, the available gain settings are 1, 2, 4, and 8. Using the UP/DOWN buttons, set the gain to 4. This is a starting point and will be adjusted at the control unit as needed for the evaporating dish. Each increase in gain will double the output, and each decrease will halve the output.
6. TIME DELAY: This is a standard feature on newer instruments. Time delay is the amount of time that elapses before a reading is taken (readings are taken in manual mode using ENTER button or automatic mode using Threshold for Peak as described below). Time delay can be set from 1 to 120 seconds. Using the UP/DOWN buttons, set the time delay to 1.
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