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1. 02:33 PM - Re: Poor Man's Battery Tester (user9253)
2. 04:10 PM - Garmin 400 series display replacement (GTH)
Message 1
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| Subject: | Re: Poor Man's Battery Tester |
XH-M609 Low voltage shut off
I purchased this module for about $5 on eBay from a seller in China. The relay
is SPST.
The digital display is not steady but flickers or oscillates between a higher and
lower digit. That is annoying.
The displayed voltage is 0.5 volts lower than the actual voltage.
The module did not come with any instructions. I learned how to use it via trial
and error.
There are two things that need to be set, hysteresis and low voltage shut off.
Press and release the button on the right to see the hysteresis set-point.
To change the set-point, push the right button twice while the set-point is displayed.
The decimal point will flash, indicating that it is in set mode.
Press the buttons labeled + and to raise or lower the hysteresis set-point.
I set mine at 1.5 volts. If set too high, the relay will not energize.
Dont dawdle because the display will revert back to battery voltage after a few
seconds.
Press and release the button on the left to see the low voltage shutoff set-point.
To change the set-point,
push the left button twice while the set-point is displayed. The decimal point
will flash, indicating it is in set mode.
Press the buttons labeled + and to raise or lower the low voltage set-point.
I set mine at 10.5 volts which is actually 11 volts because the display is a half
volt lower than the actual voltage.
As suggested by Bob, I used two series diodes (1N4148) in parallel with the clock
to limit the clock
voltage to 1.5 volts. A 2K ohm series resistor limits diode and battery current
to 50ma.
I did not want to damage the clock by soldering. So I cut a wooden dowel
to the same length as an AA battery. I installed this wooden battery into
the clock along with the clock power wires pinched between the wood and battery
contacts.
Do not make the mistake that I did and use too small wires between the battery
and XH-M609.
The relay chattered because too much voltage was dropped across the battery wires.
The XH-M609 saw low voltage and shut off the relay. With the load shut off, the
voltage increased, the relay energized.
This repeated over and over. The relay sounded like a buzzer. I then used 14AWG
wires and all was well.
The load that I used is an old automotive incandescent fog light.
With a battery connected to the test circuit, the clock ran for 70 minutes before
it shut off.
Although the XH-M609 has its faults, it worked as intended to shut off the load
when battery voltage dropped to 11 volts.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=501213#501213
Attachments:
http://forums.matronics.com//files/battery_load_tester___221.png
http://forums.matronics.com//files/battery_load_tester__157.jpg
Message 2
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| Subject: | Garmin 400 series display replacement |
Hello all,
Our Garmin GPS 400 memory battery was successfully replaced some months
ago, thanks to the advices on the list.
Here is a small summary which could help (only in French at the moment,
but if you ask...)
http://contrails.free.fr/instruments_bat_gps.php
Now another issue : the display begins to show some faded areas.
Question : does someone on the list know of a source for a replacement
screen?
Any input appreciated,
Thanks in advance,
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
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