DCP LogIT DataMetern1000 사용 설명서 - 페이지 10

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Timing

DataMeter has two high resolution timing facilities which work with digital sensors

such as Light Gates or switches to enable you to accurately time events on

digital sensors from 0.001 to 9.999 seconds. These timing facilities are Meter-only

functions so timing data is not stored in the DataMeter memory but displayed live

on screen with both the last and current times shown. As well as sensors you can

also use the green & red buttons for manual start/stop timing - the blue button is

used to leave the timing facility.

The display may appear to count slowly but you would not be able to see

thousandths of a second - but the display always catches up.

From the 'Setup timing' menu:

•Time at sensor

This timing option measures the amount of time taken AT digital sensors. For

example, if a push switch sensor is pressed and released the display will show how

long it was pressed for. You can use one or more sensors in any sensor socket.

Example: Using 2 Light gates/switches with a trolley or model car and a black

card you could measure both speed and speed difference:

Light switch A

Light switch B

Two times will be shown which relate to the speed of the car at light switches A

and B (this example shows that the car slowed down by 0.003 seconds=3mS). If the

length of the card and distance between switches is known then speed,

acceleration etc can be calculated.

•Sensor to sensor

As the name suggests, this measures time BETWEEN digital sensors.

For example, with a push switch sensor it will time between one press and the next

press. Or with the car example above it will start timing when the card passes

through one light switch and stop when it passes through the second.

Tip If you get start/stop sensing out of sequence press red button to reset timer.

Further information is in README file on the system disc.

Tip Note that DataMeter does not shut down to save power when timing. When

using Light gates we advise using the power pack wherever possible.

•Computer based Timing

Much more sophisticated timing and analysis along with saving, exporting and

printing of data is possible using purpose written packages such as Insight or

LogIT Lab software.

Time

Last

0.032s

0.029s

Time at B

Time at A

General features and controls

•POWER/CHARGING

Unfortunately, specifying battery life is not a precise art and depends on how

often you use / charge DataMeter and the types of sensors you use with it.

• For a full charge from 'empty' DataMeter requires 14-24 hours

• If fully discharged you may need to wait 2-3 minutes then reset (see below)

• DataMeter may be used and charged simultaneously but for best performance

always charge with DataMeter switched off

• Do not leave on charge for more than 72 hours or battery life may be reduced

• If using Light Gates we always recommend you power DataMeter from the

power adapter supplied as Light Gates consume a lot of power

• To get the best from the battery, cycle the charge / discharge regularly

and approx every 3 months discharge and recharge twice (you can discharge

a DataMeter by holding the green button to get it into 'Meter staying on' mode).

Tip As a general guide you will probably need to charge DataMeter for around

twice as long as you need to use it on battery power.

•RED, GREEN & BLUE BUTTONS

To avoid having lots of keys with complicated functions we have used just 3

buttons whose functions slightly vary but the display tells you what they do at any

one time. Generally the red button is for stop/no, green is for start/yes/Mark and

blue is the menu or help key. Watch the display for help prompts with labels

above each button.

•LCD SCREEN

DataMeter uses a low power LCD screen for clarity. The contrast of the screen

depends on several factors including ambient light, battery and temperature.

There is a contrast menu which allows you to select a high or low contrast setting.

•BEEP

The key 'beep' can be alternately turned on/off using BEEP menu.

•SETTING TIME and DATE

Some LogIT datalogging software uses the 'time stamp' from the internal clock to

show when data was collected. (see page 13).

•RESET

Any computer based product can occasionally get itself into a condition from

which it cannot recover by itself (or 'crash'). DataMeter is no exception and so if,

for example, you let the battery completely discharge or simply think it is not

doing what you expect you should reset it. DataMeter has two unmarked hidden

reset buttons located directly above the red and green buttons - you must press

them both to reset (see page 4). We have hidden the buttons so that they are not

pressed accidentally (or mischievously by a student!).

FULL RESET AND CLEAR: Pressing both buttons just gives DataMeter a basic reset.

But if you press and hold the blue button and at the same time press both reset

buttons you will also reset the clock and clear all data in the memory - use with

care! NB: If Screen ever says "RELOAD SYSTEM" see "Problems" on page 23.

•GENERAL

The case is NOT waterproof - never let water or damp get into the DataMeter

case and never use detergents etc. The battery should last many years if care is

taken and the advice given in this manual is taken (NB: battery can only be

replaced by the manufacturers).