Decel Test Settings

Start/End Speed 

Define the start and end speed conditions of the deceleration test by pressing the corresponding buttons and using the presented keypad.
 

Start Speed Keypad Example
 

Save the selected value by pressing the Confirm button in the bottom right corner. Press the Cancel button in the bottom left corner to return to the Settings screen without saving.

Note: The maximum input value for speed is 999.9 and can be entered up to 1 decimal place.

Minimum Trigger Speed 

Define the minimum trigger speed at which trigger activation becomes valid. If the trigger is detected below this speed, the test will not start. Change this value by pressing the current value and using the presented keypad.
 

Minimum Trigger Speed Keypad Example
 

Save the selected value by pressing the Confirm button in the bottom right corner. Press the Cancel button in the bottom left corner to return to the Settings screen without saving.

Note: The maximum input value for speed is 999.9 and can be entered up to 1 decimal place.

Alert at Start 

 

Select to enable audible and visual alert signals when the decel test's start speed criteria are met. The unit will briefly beep and the 4 LEDs across the top of the device will flash green.

Alert at Trigger 

 

Select to enable audible and visual alert signals when the decel test's trigger test has started. The unit will briefly beep and the 4 LEDs across the top of the device will flash green.

Alert at End 

Select to enable audible and visual alert signals when the decel test's end speed criteria are met. The unit will beep and the 4 LEDs across the top of the device will flash green. 

Write Results to SD

Select this option to enable the decel test results to be written to an inserted SD card.

If the unit cannot detect an SD card:

• the unit will beep
• the 4 LEDs across the top of the device will flash red
• the unit will emit an audible tone
• a 'NO SD CARD' message will display

MFDD Settings 

This area allows you to set up the start and end periods of the Mean Fully Developed Deceleration (MFDD) analysis period.

Speed MFDD Settings

Trigger MFDD Settings

This deceleration figure is used to show the maximum deceleration figure a vehicle can achieve. It is usually the deceleration between 80% and 10% of the trigger activation speed, the time at which the vehicle is loaded up and braking at its highest achievable level.

The MFDD is calculated by the following formula (using default 80% – 10% value):
 

MFDD = ((v_08)² – (v_01)²) / (25.92 * (s_01 – s_08))
 

Where:

• v_08 is the speed at 80% of the brake trigger activation speed.
• v_01 is the speed at 10% of the brake trigger activation speed.
• s_01 is the distance at which the speed is v_01.
• s_08 is the distance at which the speed is v_08.
   

You can also calculate MFDD using Speed by tapping the Percentage label until it reads Speed and entering the required values.
 

 

To change any values, press the current value and use the presented keypad.
 

MFDD From Speed Keypad Example
 

Save the selected value by pressing the Confirm button in the bottom right corner. Press the Cancel button in the bottom left corner to return to the Settings screen without saving.