Eberhard Chrono 4 21-42, User Manual

OPERATING INSTRUCTIONS FOR THE CHRONOGRAPH

Press the push-button 

A

 to start the chronograph mechanism. Press the push-button a second 

time to stop the chronograph mechanism. You can now read on the counters how many seconds 

G

,  

minutes 

H

 and hours 

I

 have elapsed. Press the push-button again and the chronograph will restart 

from the intermediate stop. To return to zero, the chronograph must be in the stop position. Press the 

second push-button 

B

 and all hands will return to zero. You are advised not to leave the chronograph 

mechanism operating continuously.

PUSH-BUTTONS

Make sure push-buttons are always pressed in the following order:

A

 : start

A

 : stop

B

 : return to zero

Abide by this sequence quite severely so as to preclude damage to the mechanism.

Never make use of the push-buttons under water since they are not watertight while being pressed.

TACHOMETER SCALE (VERSION WITH STEEL BEZEL)

The outer rim on the dial shows the data needed for metering the speed of a vehicle over a distance of 

1,000 metres.

The moment the vehicle passes the first reading marking the beginning of said 1,000m distance, activate the 

hand 

G

 of the chronograph to bring it to a stop the moment the vehicle passes the second reading mark. Said 

hand 

G

 will now indicate the average speed reached in km/h in tune with the tachometer scale.

Example: when one kilometre is covered within 45 seconds, the average speed displayed by the centre 

seconds-hand 

G

 on the tachometer scale will be tantamount to a speed of 80km/h.

TACHOMETER SCALE (VERSION WITH CERAMIC BEZEL)

The tachometer scale on the ceramic bezel shows the data needed for metering the speed of a vehicle over 

a distance of 1,000 metres.

The moment the vehicle passes the first reading marking the beginning of said 1,000m distance, activate the 

hand 

G

 of the chronograph to bring it to a stop the moment the vehicle passes the second reading mark. Said 

hand 

G

 will now indicate the average speed reached in km/h in tune with the tachometer scale.

Example: when one kilometre is covered within 45 seconds, the average speed displayed by the centre 

seconds-hand 

G

 on the tachometer scale will be tantamount to a speed of 80km/h.