- 6 -
Finally, set the MeterMatch rotary switch
Ѳ
back to "0" (Normal Operation), put the cover back on,
and enjoy using your calibrated gauge.
You can go back and reset any point using the same process, it will simply over-write the data for that
point stored previously. If you would like to erase a point (for example a point or limit you don't want
to use any more): with no power applied, set the rotary switch
Ѳ
to the position reflecting the point
you want to erase, hold down the Save button, then turn power on.
Note:
After initial calibration, particularly for temperature gauges, it’s a good idea to check at least
one midpoint value to ensure that the reading is correct. If not, the sender and/or gauge may be non-
linear, leading to inaccuracy. In this case, accuracy can be enhanced by using one or more
additional calibration points.
Alternate calibration process (sender resistance known):
If you know the resistance of your sender, you can use that to help do calibration. You will need to
know the sender range (end-points) in Ohms. For example the sender might be 240 Ohms (
) when
the reading is low, and 33 Ohms when the reading is high. If you have this data, there are two ways
that you can use it for calibration:
Method 1:
Connect a resistor (available at places such as Radio Shack) of the desired value on the
MeterMatch sender input pin (pin 3) to ground, then perform calibration at that point just as with the
standard calibration process previously shown.
Method 2:
You can have MeterMatch calibrate to some internally stored resistance values. To use
these, do the following:
1. Power up MeterMatch
2. Set the rotary switch
Ѳ
to zero (normal operation)
3. Press and hold the Save button. The LED will illuminate.
4. While the Save button is being held down, press the Up button, the number of times shown in this
table. Each time you press the Up button the LED will blink the number of times that it has been
pressed. For example after you have pressed it twice, it will blink twice. You can start over at any
time by releasing the Save button.
Number of "Up" Button
Pushes
Sender Resistance Simulated
(Ohms)
1
0
2
10
3
33
4
73
5
90
6
180
7
240
