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In conjunction with R3 and the typical internal resistance of the gauge, this implements an approximately 750:
1 voltage divider for the output of R4. A removable jumper in the heater circuit would permit current
measurements to be made but note that the typical multimeter may have enough voltage drop
on their current ranges to significantly reduce the heater current in this low voltage circuit
resulting in an incorrect setting (5 or 10 percent too high).
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services. For best performance, the transformer should probably use a ferrite core but
a regular iron power transformer will work for systems using an AC line
powered TC gauge heater, and probably for most oscillator powered systems as well.
Slide the scale so that the zero line aligns with the
fluid level. These have full scale ranges from 20 microns
to 1,000 Torr. It has a range of 0 to 1,000 microns with fully adjustable upper and lower limits.
Later I wound a transformer on a ferrite core with 100 turns for the primary (centertapped) and 1,000 turns for
the secondary. It now works nicely as a DV-6M based vacuum controller at the most
important high vacuum-end of the scale but with slight correction required at pressures above about 100 mT.
Oh, well, one can't have everything. In addition, the controller was actually
wired for a TC gauge tube with a DC heater on pins 1 and 7 with
a 10 mV full scale output (at high vacuum) between pins 3
and 5 - nothing like the DV-4AM or any other Hastings TC gauge tube which use an AC
heater. Almost everything else (power supplies and meter amplifier for 10 mV full scale
input) is already present. The original 1K ohm input resistance resulted
in readings that were way high. But then I noticed that
the wiring looked like it wasn't original anyhow but had been cobbled
together to operate the non-Hastings tube - the
PCB looks like it was actually designed for a Hastings-type tube with an AC heater but none of the parts were
ever installed.
Need GE appliance parts too? While not quite as accurate as using individual reference tubes (an expensive one
for each type gauge), the parts cost of the tester is negligible
and any major problems will be obvious in about 5 seconds.
For a vacuum sensor, a thin metal diaphragm separates a permanently evacuated
and sealed "reference" volume from the vacuum system whose pressure is being measured.
The circuit below can be used to test any Hastings TC readout
or controller (VT or CVT) using the DV-3, DV-4, DV-5, DV-6, or DV-8
TC gauge tubes for correct operation without the use
of a vacuum system or even the need for the matching tube. Since all 6 positions are wired
similarly, they can really be used any way desired.
If one of these machines gives you, we understand the correct
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Note: For gauges and controllers without
active circuitry in the meter circuit, testing of the meter can be
done with the unit unpowered. For example, they can be precisely matched to several specific TC gauges of the same type rather than different types as
shown in the schematic. The extension to testing of the DV-23 and DV-24 based
Hasting TC gauges is left as an exercise for
the reader. We provide emergency Same Day Jenn Air Dryer repair Services in Barrhaven, Ontario.
A clothes dryer that is not drying out garments correctly will
have a full lint capture. If you are dealing with a decent vacuum, there is no
real choice - a proper vacuum gauge will be needed.
Since I haven't been collecting TC gauge tubes with separate heater and output pins, at first I was disappointed that I didn't have
any way of using this controller. The filtered output is then used to drive the
meter through a voltage divider. An "OFF" position disconnects
the load and meter but leaves the filtered (peak) output
available for measurement. Note that since this circuit does not generate an output proportional to the true RMS value of the heater current, there will be slight differences
in response based on the actual waveform used to drive the heater.
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