As noted above, one nice factor about these sensors is that all the "smarts" are contained in the strain transducer. The NV-100 does one factor in a different way though: It maintains the DV-a hundred heater at a constant temperature (within a limited present vary) moderately than using fixed voltage or present. Without specifications for the capacitance of the diaphragm and/or frequency calibration, all I could try was the electronics and Vape on Sale as far as I might tell, Largest Vape Store this was working appropriately, vape store together with the achieve (span) and zero circuitry, and temperature regulating heater.
Modern versions of these capacitance manometer based mostly vacuum/pressure gauges have few deficiencies but for older fashions, there were several: - Temperature affects the mechanical construction (and to a lesser extent, the sensing electronics) so a heater is usually included to take care of a constant temperature. There are other manufacturers of capacitance manometer based mostly vacuum/strain measuring devices including Teledyne Hastings however the most effective identified might be BOC Edwards with their "Barocel" fashions (formerly from Datametrics).
DV-three gauge tube current (by measuring the output as described above) since this tube requires the most current. It is basically a universal reference tube emulator. In addition, the controller was truly wired for a TC gauge tube with a DC heater Vape on Sale pins 1 and 7 with a 10 mV full scale output (at high vacuum) between pins 3 and 5 - nothing just like the DV-4AM or another Hastings TC gauge tube which use an AC heater.
The sensor Disposable Vape (seen within the photo) turned out to be a Hastings DV-4AM which has a really totally different calibration curve than what was on the meter face.
I ripped out the original TC gauge circuitry because it was for a tube of unknown sort and added an SG-TC2 driver for use with the Hastings DV-6M tube. After calibration using my DB-18 which is the reference tube for the DV-5, it now tracks my NV-8B (DV-8) readout pretty carefully which provides me some confidence that both the readouts are accurate and the reference tube hasn't leaked a lot. Use the same wrench to unscrew and remove the solenoid valve.
The circuit beneath can be used to check any Hastings TC readout or controller (VT or CVT) utilizing the DV-3, DV-4, DV-5, DV-6, or DV-8 TC gauge tubes for appropriate operation without using a vacuum system and even the need for the matching tube. Safety valve disassembly and inspection (if current) - Carefully pull off the two spade lugs which attach the wires to the solenoid valve. It is a durable, Affordable Vape, and hearth-resistant materials, and it’s these qualities that made it an excellent choice for use in the construction trade.
A gauge of this kind could be best for the HeNe and Ar/Kr ion lasers, and others which can be pumped down and maintained beneath a certain stress over lengthy durations of operation or previous to seal-off of the tube. And, although easy, a home-built ion gauge would be still be a reasonably involved venture. As soon as calibrated for a specific readout or controller unit (or units), the readings ought to be constant and enable a fast test ought to habits of that unit change for unknown causes.