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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
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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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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 just click the following web site 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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