DIGITAL DELAY REPLAY TACH Anleitung Handbuch - Seite 7

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For example if the first shift is at 6900 and the second is at 6400, after the first shift the engine must fall below 6350 for the

unit to look for the second shift.

The Shift Output setting corresponds to the operation of Shift terminal on the Replay Tach with RPM Switch and can

only be changed under the setup screen Shift Output. When the Shift Output is set to "HI" (normally open) it means every

time a Shift Point is reached the Shift terminal will go from a low (0 Volts) to a high (12 Volts). When the Shift Output is set

to "LO" (normally closed) it means that every time a Shift Point is reached the Shift terminal will go from a high (12 Volts) to

a low (0 Volts).

First test the Shift terminal for output. The easiest way to test the shift output, is to toggle the Shift Output mode

(explained above) between the HI and LO settings. Each time the Shift Output mode changes states the shifter should also

move. If the shifter does not move disconnect all wires connected to the Shift terminal. Then using a Digital Volt Meter or a

test light check the Shift terminal, it should have 12 Volts when the Shift Output Mode is set to LO and zero volts when the

Shift Output Mode is set to HI.

Note: The Replay Screen can only be viewed with the engine off.

The Replay Tach with RPM Switch has a built-in replay tach that has two record speeds. The record length can be set

to either 15 seconds or 30 seconds, the record length setting is in the setup modes screen. In the 15 or 30 second record mode

the recording starts as soon as the push button connected to the record terminal is released. In the 30 second record mode the

engine RPM is recorded every two hundredth of a second for thirty seconds. In the 15 second record mode the engine RPM is

recorded every hundredth of a second for fifteen seconds after the record Pushbutton is releases and the engine RPM rises

above the pause RPM setting. Keeping in line with the rules for both NHRA and IHRA where there can be no direct or

indirect connection between the ignition and the transbrake, Digital Delay had to remove the ability of the replay tach to start

with the release of the transbrake. This led to another problem, of the driver trying to release the record button as close to the

release of the transbrake as possible to ensure that the entire pass would be recorded in the allotted 15 seconds. The pause

RPM is used to compensate for this, by repeatedly overwriting the first stored value until the pause RPM is reached. Once the

pause RPM is reached the unit stops overwriting the first memory location and will continue recording the rest of the pass

normally. While the recording is no longer synchronized with the release of the transbrake, by using the pause RPM the first

stored value will be close to the release of transbrake.

Note: If the engine RPM is below the reset RPM pressing the menu button will cancel the recording.

To replay a previously recorded pass the engine must be turned off. Only then will the Replay Tach with RPM switch

allow access to the replay screen. Use the Up Arrow key to scroll the time up and the Down Arrow key to scroll the time

down. There are four scrolling speeds in each direction with the scrolling stopped in the middle. Each time an Arrow key is

pressed and released the scrolling speed will speed up. If while the time is scrolling and the opposite Arrow key is pressed and

released the scrolling speed will slow down. For example if the Up Arrow key was pressed three times to get a faster scrolling

speed, pressing the Down Arrow key once would cause the scrolling speed to slow down. Pressing the Down arrow an

additional two times would cause the scrolling to stop. If the Down Arrow were then pressed again the time would start

scrolling down.

The Change button is used to stop the scrolling of the replay tach regardless the scrolling speed. If in the previously

recorded pass there was at least one shift, pressing the menu button will cause the unit to jump directly to the shift point and

display the time and RPM the shift occurred. If more than one shift point was recorded pressing the menu button again will

cause the unit to jump to the next shift point.

During a replay of a pass with a standard electric automotive tachometer connected to the tach-out terminal on the

Replay Tach with RPM switch, the external tach will also show the recorded engine RPM.

The Replay Tach with RPM switch also has a Digital Data port located on the side of the unit opposite the terminal

strip. This Digital Data port is used to download a recorded pass to a hand-held unit called a Digital Viewer (Part # 1025-DV).

Once the recorded pass has been downloaded it can be viewed on the screens of the Digital Viewer or printed out on an IBM

compatible DOT matrix printer. When a recorded pass is printed, there will be a line showing shift points for the pass that was

recorded at the top of the paper. A sample print-out of a recorded pass is shown on the next page along with a drawing of the

Digital Viewer.

DIGITAL DELAY REPLAY TACH Anleitung Handbuch - Seite 7

Testing the Shift Output

Understanding the Replay Tach