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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). Our friendly customer service team is available to answer
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Founded in 1978, American West Appliance Repair & Service Of Woodland Hills is
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will have access to near-immediate expert appliance installation and
repair 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 way effortless they really are.
To find out the best repair team you can get quotes and
compare them and fix one from that.
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.
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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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