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Notes:
1. This method is only suitable for use where the pulser on the vehicle continues to produce
pulses even when the vehicle is moving very slowly.
2. It is not suitable for use with many proximity senders.
3. It is not suitable for use with 80mph scale tachographs.
4. If testing a Kienzle 1319 tachograph, ensure that the km/h scale is selected (see Section 5.4 for
details).
Procedure
A
B
20 metre track
Pointer
Distance 1
Distance 2
To use Fixed Distance Method No. 1 reliably, a method is needed of indicating accurately when
the vehicle is at the beginning and end of the measured distance. For the duration of the test some
form of pointer should be attached to the vehicle with its pointing end close to the ground. The
vehicle is driven such that the pointer passes directly over the marks at either end of the measured
distance. It is then much easier to measure the distance between each mark and the point at
which the next pulse occurs.
When attaching the pointer to the vehicle it is preferable to fix it to a point rigidly attached to the
chassis (e.g. the end of the front bumper) and not to the cab which is often sprung.
Select FIXED DISTANCE #1 from the Main Menu, and follow the instructions displayed in the
step-by-step details of the procedure that follow;
Select FIXED DISTANCE #1 on the MAIN
MENU (shortcut key 2) using the ← and →
keys, and press ENTER.
VR8400 MAIN MENU
:FIXED DIST #1
21
Document No. 6957-193
June 2006 Revision 2.3
©Copyright Stoneridge Electronics Ltd
Manufacturers of VEEDER-ROOT Tachographs