- 5 -
Calibration
Once wired, it is necessary to calibrate your MeterMatch.
The rotary switch
Ѳ
positions are used as follows:
0
Normal Operation after calibration
1
High calibration point
2
Mid-high calibration point
3
Mid-low calibration point
4
Low calibration point
In addition to the terminal strip and rotary switch, you will find three push-buttons:
Up
Moves the meter needle one direction
Dn
Moves the meter needle the other direction
Save
Stores the calibration point presently selected
Standard calibration process (sender resistance not known):
1. Set your sender to a point near one end of the value being measured (we'll start at the top in this
example, but order is unimportant).
2. Set the rotary switch
Ѳ
to position "1" (High Calibration Point). The LED in MeterMatch will light
up.
3. Use the Up/Dn buttons to make your gauge read the appropriate setting for the present sender
output. Depending on the gauge, the buttons may work backwards, but don't worry about that - just
make the gauge read the desired value. MeterMatch will work properly even if polarity is reversed
between the gauge and sender.
Some meters are well-dampened so this process can take a little
time. Make a button press or two at a time and wait for the gauge to respond. It doesn't hurt to tap
lightly on the gauge too.
There are several hundred increments, so it may take many button-presses.
4. Press the Save button to save this calibration point. The LED on MeterMatch will go out
momentarily to indicate that the value is being saved, and then turn back on.
Note: Calibration doesn't need to be done at the extreme high and low sensor points, but most
accuracy is achieved when near the limits of the readings.
Repeat these steps but with the sender set to a position for the other end of measurement, the rotary
switch
Ѳ
to "4" (Low Calibration Point), and then use the Up/Dn buttons until gauge is reading
appropriately, then press Save again.
