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H-51 metrometer calibration

The manual describes all the methods for calibrating the distance measurement.

Calibration according to known distance

The simplest method of calibrating a tripmeter is to match the ODO distance display to the actual distance travelled of a known length. The length of the section can be any, the longer the section the more accurate the calibration, but the calibration section should not be longer than a few kilometres.

Press MENU long to bring the tripmeter to the start screen position.
When you see the start screen [ _ _ _ _ ] skip this point
switch the tripmeter to the measurement position by pressing the F button ( ODO and TRIP will be equal to 0 )
and then drive a road section of known length
stop at the end of it
press CAL briefly 2 x, which causes the current calibration factor to flash
press the arrow buttons and bring the ODO distance indication ( which will replace the calibration factor value on the display ) to the known distance you have travelled
press F briefly to accept the change or leave it on the screen and after 6 seconds the change will be accepted.

When the coefficient exceeds the value of 9999 the rightmost, least significant digit will disappear and all the dots between the digits will light up to signal such a situation. Pay attention because you will not be able to see the numbers that have slipped off the screen.

Calibration value measurement function

It is possible to measure calibration values on the H-51 tripmeter. You can measure over any distance, but enter the calibration value converted for a 1000m stretch of road into the tripmeter ( e.g. if you measure over 100m, multiply the measured value x10 and enter it into the tripmeter).

Press MENU long to bring the tripmeter to the start screen position.
When you see the start screen [ _ _ _ _ ] skip this point.
Press the MENU button briefly until POM is shown, then press the F button. The appearance of the digit 0 when the tripmeter is not counting pulses or the counting screen when the tripmeter is counting pulses confirms the activation of the function
press button F to delete the measured value and start the measurement again ( e.g. at the beginning of a calibration section )
press the up arrow button to stop measuring, then press the up arrow button again to resume measuring
Press the F button for a long time to save the measurement.

When measuring a factor of more than 4 digits , as soon as the measurement exceeds 9999 the last right least significant digit will disappear and all the dots between the digits will light up to indicate such a situation. Pay attention because you will not be able to see the numbers that have slipped off the screen. Also consider measuring the calibration factor over a distance of less than 1,000 m.

Calibration value entry function

It is possible to enter a known calibration value in the tripmeter. When you set the MULTI k parameter to OFF, you can enter 1 calibration factor, and when you set the MULTI k parameter to ON, you can enter up to 10 factors by assigning consecutive numbers to them.

Press MENU for a long time to bring the tripmeter to the start screen position.
When you see the start screen [ _ _ _ ] skip this point
press the MENU button briefly until WPIS is shown, then press the F button. When theu _ sign appears, it confirms that the function has been started.
enter the calibration value using the buttons:
- the up/down arrow briefly changes the value of the digit,
- F briefly, which moves a digit to the left and allows you to enter the next digit
- MENU briefly deletes the last digit (by pressing the menu you can stop typing altogether)
press button F long to save the entered coefficient

NOTE: When Multi k is enabled after storing a value, you will see a screen designed for entering the calibration memory number under which you will store the measured value.

When you enter a factor of more than 4 digits , as soon as the first digit on the left is out of the screen, all the dots between the digits light up to indicate such a situation. Pay attention because you will not be able to see the numbers that have slipped off the screen.

GPS-based auto-calibration function *

The H-51 tripmeter is capable of auto calibration using GPS. Calibration can replace the calibration section.

Press MENU long to bring the tripmeter to the start screen position.
When you see the start screen [ _ _ _ _ ] skip this point.
press the MENU button briefly until AUTO is displayed, then press the F button
When you see the word AUTO flashing, start the calibration . The measurement will start when the vehicle speed is greater than 15 km/h and the number of satellites is greater than 6.
press F briefly to interrupt and restart the self-calibration at any time
drive until the counting stops, which will mean driving 1000 m and the end of auto-calibration
Press the F button for a long time to save the measured coefficient.

If you slow down or the GPS signal weakens during the measurement, the auto-calibration is interrupted and you will see the blinking AUTO text

Activation of calibration factor – only when MULTIk parameter = ON

When using multiple calibration factors ( e.g. for different tyre sizes ) , a calibration factor must be selected from memory in order to be active. The selection of a coefficient is permanent – it will be used for calculations until another value is selected.

during measurements press 1x CAL briefly – you will see the active coefficient
press the up or down arrow button to browse through the stored coefficients
select coefficient
press buttonF briefly or wait 6 seconds to save your selection

Checking the value of the active factor

Press MENU long to bring the tripmeter to the start screen position.
When you see the start screen [ _ _ _ _ ] skip this point.
switch off and then switch on the power supply to the tripmeter
you will see the digits 8888 and then the active calibration factor will be displayed

When the ratio contains more than 4 digits, the 4 most significant digits separated by dots will be shown. The 12000 factor will be presented as 1.2.0.0.

Calibration menu with MULTIk = ON

When the MULTIk parameter is set to ON, when measuring, entering or auto-calibrating, you will have to enter the memory number under which you will store the coefficient after validating the measured value.

perform the measurement, entry or auto-calibration according to the relevant chapters and confirm the measured/entered value
when you see [ _ ] after confirmation, press the up-arrow or down-arrow key to enter the memory number under which you will save the coefficient
press F to store the calibration value and memory number

NOTE: Entering a calibration factor into memory does not automatically activate it.

Vehicle calibration factor

This is the number of road pulses counted from the vehicle corresponding to a journey of 1000 m.
Calibration factor you can:

configure according to known distance [ recommended ]
measure a distance of any known length, but enter the number of pulses corresponding to a distance of 1000m into the tripmeter ( e.g. if you measured the number of pulses over a distance of 100m, multiply the measured value x10 and enter into the tripmeter)
enter a known factor
* measure by autocalibration using the built-in GPS module

[*] refers to the version with GPS