Actron CP7665 Instrucciones de operaciones descargar pdf (Pagina 7)

7

Fig. 5

This sensor can’t be shorted so re-

duce the range setting until you get

a value of resistance.

At the 200KΩ range the multimeter

measured a value of 4.0. This means

there is 4KΩ of resistance across

the engine coolant sensor termi-

nals. (See Fig. 4)

If we change the multimeter to the

20KΩ range (See Fig. 5) the dis-

play shows a value of 3.87KΩ. The

actual value of resistance is 3.87KΩ

and not 4KΩ that was measured in

the 200KΩ range. This is very im-

portant because if the manufacturer

specifications say that the sensor

should read 3.8-3.9KΩ at 70°F then

on the 200KΩ range the sensor

would be defective, but at the 20KΩ

range it would test good.

Now set the multimeter to the 2000Ω

range. (See Fig. 6) The display will

indicate an overrange condition be-

cause 3.87KΩ is larger than 2KΩ.

This example shows that by de-

creasing the range you increase the

accuracy of your measurement.

When you change the range, you

change the location of the decimal

point. This changes the accuracy of

the measurement by either increas-

Fig. 6

ing or decreasing the number of

digits after the decimal point.

Battery and Fuse

Replacement

Important: A 9 Volt battery must be

installed before using the digital mul-

timeter. (see procedure below for

installation)

Battery Replacement

1. Turn multimeter rotary

switch to OFF position.

2. Remove test leads from

multimeter.

3. Remove screws from back of

multimeter.

4. Remove back cover.

5. Install a new 9 Volt battery.

6. Re-assemble multimeter.

Fuse Replacement

1. Turn multimeter rotary

switch to OFF position.

2. Remove test leads from

multimeter.

Fig. 4

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