ACR Electronics SmartReader Plus Bedienungsanleitung PDF herunterladen (Seite 51)

SmartReader Data Logger

Figure 7-4: Modifying the 10 Volt Channel for Extended Voltage Range

You can also easily convert the 10V channel to measure 0 to 100mA current simply by putting

a 100 ohm resistor (minimum rating: 2 watts) between the "10V" and "-Common" terminals.

5 Volt Channels

The two 5 volt channels can be modified to span higher ranges (greater than 5V DC) by

adding a single resistor, in the same way as shown for the 10V channel in Figure 7-4, to either,

or both, of the two "5V" terminals. The value of the resistor (R) can be calculated by the

following equation based on the desired voltage input range (Ein):

R = 4,000 * Ein - 20,000

For example, if you wish to measure up to 20 volts, the resistor value should be:

4,000 * 20 - 20,000 = 60,000 ohms

Since you will not always be able to get the exact resistor value that you calculated, you can

determine the actual input range you will have by plugging the value of the resistor back into

the formula:

Ein = R + 20,000 / 4,000

You can easily convert either or both 5V channels to measure 0 to 50 mA current by wiring a

100 ohm resistor (minimum rating: 0.5 watts) between the "5V" and "-Common" terminals.

2.5 Volt Channel

The 2.5 volt channel can be modified to span higher ranges (greater than 2.5V DC) by adding

two resistors to the input terminals as shown in Figure 7-5. The value of the resistor marked "

10k" must be 10,000 ohms ±1% or better. The value of the resistor (R) can be calculated by

the following equation, based on the desired voltage input range (Ein):

R = 4,000 * Ein - 10,000

For example, if you wish to measure up to 20 Volts, the resistor value should be:

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 102 103

Keine Kommentare

ACR Electronics SmartReader Plus Bedienungsanleitung Seite 51