One function Multimeter is its usefulness as Ampere-meter to measure the strong electric current between 0-1000 milli-Amperes (mA) or more depending on the specifications Multimeter. Measuring range switch in the position of the DCMA, measuring limit (range) at the 0.25 figure, 25, or 500 DCMA, as needed. The measurement results read on a scale of 0-250 DCV Board, A. On the position measuring strong currents, Multimeter put in series / series with dry batteries (dry cell) and / or the electronic circuit (electronics circuit) to be measured. Consider the image 29 and image 30.
Figure 29. Flow Measurement in Dry Battery
(Batteries in series with the battery linked multimeter measured)
Figure 30. Measurement of Flow on Networks
(At some point, the circuit is disconnected and then the current is measured)
1. Measure Battery Capacity Dry (Dry Cell)
The battery capacity is the ability of dry batteries (dry cell) stores the electric current to then-catukan / supplied to the electronic circuits that need. The battery voltage of the cell (single cell battery) is generally 1.5 Volt. A battery if measured with a measuring range switch Multimeter at 10VDC for example, can only show the results of measurement of 1.5 Volt.
But if it is connected to a load (an electronic circuit) that requires a voltage of 1.5 volts, the battery can not power to flow into the electronic circuit in question (this is because the prisoners in / Rd huge battery). The most effective way to check if a dry battery (dry cell) is still able to dole / drain current is by measuring the current.
2. Measuring Flow On Networks
a. If needed, use the needle position adjustment bolt (presets), adjust the position of the needle on the scale so that the board is in a position to zero.
b. Measuring range switch placed in the position of the DCMA, measuring limit (range) to 500.
c. Note the picture 32. Cable investigator (probes) red (+) is placed at the point of the test (test point / TP) circuit is one with a positive point of connection with the power supply / battery.
d. Cables investigator (probes) black (-) is placed at the point of the test (test point / TP) circuits that were connected with the negative point of the power supply / battery.
e. The needle on the scale board will move to the right point number between 0-250 DCV, A (on some measuring instrument, on board a written DCV scale, the scale of A means for DCV, DCA and DCMA, or VMA means that scale for DCV, ACV and DCMA).
f. If in the measuring limit (range) 500, the measurement results are less legible, measuring limit (range) can be moved its position at number 25 or 0.25.
3. Reading Measurement Results
There are two ways to read the measurement results strong currents on board scale, First, using the formula:
and Second, read directly. For the first way, eg measuring limit (range) is placed in the position number 25, the scale used was the appointment of a full-scale (0-250). Needle point number 175, a strong current flowing is: I = 175 x 25/250 = 17.5 mA.
The second way,
a. To limit measure (range) of 0.25, the measurement result is read on a scale of 0-250. The needle on the board pointing to the scale of 250, the results of measurements = 0.25 mA. The needle on the board pointing to the scale of 200, the results of measurements = 0.20 mA and so on.
b. To limit measure (range) 25, the measurement result is read on a scale of 0-250. The needle on the board pointing to the scale of 250, the results of measurement = 25 mA. The needle on the board pointing to the scale of 200, the results of measurement = 20 mA and so on.