Hey guys,
Recently somebody was nice enough to post information about some LCD front
panel meters he found on internet (Thanks!!!). I thought that such meters
will be a nice addition to my KPA/KAT in EC2.
The front panel looks empty and it is only occupied by the LED indicators at
the bottom so there is a plenty of space. I got two meters from Martel
Electronics - QM-100V (voltmeter 4 - 25V) and QM-110T (thermometer with
internal and external sensors, Fahrenheit or Celsius). The voltmeter shows
the voltage of the main supply and the thermometer shows the temperature of
the heatsink. The LCD meters are very nice and quick to install (just a 5mm
hole is needed). They are pretty accurate too - dead on with my recently
calibrated Fluke. Both meters can be calibrated if needed. The thermometer
can show the external temperature from a sensor which I installed on the
heatsink or the internal temperature from a build-in sensor. Both sensors
can be calibrated if needed (small adjustment screws on the back of the
meter). I left also space for future addition of an amp-meter, but it will
require pretty big shunt, which I might install in a separate box outside of
the EC2. I used different computer connectors (from an old motherboard) so
everything can be plugged or unplugged easy should I decide to move the
KPA100 into my K2. There is also a jumper on the back of the front panel to
switch the thermometer between F and C and EXT/INT sensor).
The voltmeter is also very useful with an adjustable power supply to get the
exact voltage for charging the SLA battery in K2
Here are some pictures - (sorry, didn't have time to write a HTML).
http://pages.cthome.net/itv/KPA100_LCD1.jpg
http://pages.cthome.net/itv/KPA100_LCD2.jpg
http://pages.cthome.net/itv/KPA100_LCD4.jpg
http://pages.cthome.net/itv/KPA100_LCD5.jpg
73s
Andrey E. Stoev
KB1FZA
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