Fuse the starfish to the lower left corner of the bag front just above the cut out notch. Hand out a blackline of a gingerbread man. 13.) Gingerbread Baby Mini Book Student reads book and cuts out the graphics. Similarly, check out the log scale if present. Here is a general procedure for checking out an ion gauge controller without an ion gauge sensor or vacuum system, or the gadget described in the next section. Depending on where the emission adjust pot of the controller is set, the filament may come on only momentarily, or for somewhat longer. If the controller has a way of measuring emission directly, try it. Try the filament on/off and degas functions. Attach the auto head light bulb to the filament pins of the ion gauge tube connector. If a second light bulb isn't already attached to the grid, power down and make sure the voltages have decayed, and attach one now. Install the 100 ohm resistor or your second auto head light bulb between the two grid pins.


These tests will also require a 100K resistor and 100K pot (to simulate the emission current path) and a 100 ohm resistor (to provide a current path between the two grid pins unless a second head light bulb is used to act as the grid). Since there is no load, these will probably not stay on but the indicator lights may flash momentarily or for a second or so. I don't know if there is any benefit to electron bombardment degas but it is certainly more complex and much more dangerous (with 800 V at sizable current availability) present on the ion gauge tube electrodes as well as the electrometer input during degas. Rice noodles (also sold as Rice Stick), udon noodles, soba noodles, and more are all easy to find, but can be tricky to cook well. This activity can be performed on school ground where rain gutters are present or at home.


The bigger light packets, the red, oranges, yellows, and some greens are able to bump their way through the molecules and pass to the ground. If you have any kind of issues relating to wherever in addition to how to use designer straw bags, it is possible to e mail us from our own page. Move the range selector (if present) through its settings and see that the meter or display doesn't peg to one end - ground the input and zero it if necessary. On the most sensitive ranges, just putting a finger near its input should evoke a response, probably pegging the meter on the lowest 3 or 4 settings. Inputs from other (e.g., TC vacuum gauges) may also be used for this. While many common ion gauges consist of a (usually) fragile glass tube sensor and separate display/readout, the MKS-909 MIG (Miniature Ion Gauge) Transducer puts all of that in a compact relatively robust unit with overall dimensions less the 3x4x5 inches and weighing in at about 1 pound - smaller and lighter than the typical ion gauge tube in protective enclosure alone. The process outputs (if present) can be checked by monitoring them while exercising the electrometer amplifier.


WARNING: Potentially lethal voltages are present on the ion gauge connector/cable when the controller is powered and possibly for awhile after it is turned off! Enable autoranging (if present) and confirm that it defaults to the highest setting (probably if the filament is off as it is now). The required ion gauge controller subsystems include: Filament power supply: Filament current is precisely regulated based on desired electron emission current. Without feedback (filament current to emission current), it may not be possible to keep it on but there may be a range of positions of the external pot and/or emission pot where the brightness of the filament can be varied. There must be another force acting upon them. Thus, for a full scale reading of 10-7 Torr, the amplifier must have a full scale sensitivity of 1 nA! The only part which is non-trivial is the electrometer amplifier which must deal with extremely small values of ion current.