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MX 20

3.4.5 - DC CURRENT MEASUREMENT3.4.5 - DC CURRENT MEASUREMENT

3.4.5 - DC CURRENT MEASUREMENT

· When used as an ammeter, the MX 20 is alawais in manual

ranging mode.

· Connect the black lead to the COM terminal and the red lead to

the mA terminal for measuring currents less than 200mA or to the

A terminal for measuring currents up to 10A.

· It is best to begin by selecting the highest possible range (10A)

when the order of magnitude of the current to be measured is

unknown. In this case set the rotary switch to the corresponding

A position and select the A input terminal.

· If necessary, press the AC/DC key to display the DC symbol.

· Do not connect the multimeter in series with the circuit to be

measured until the last possible moment. Then switch on the circuit

to be measured.

· If the range chosen is too high, first switch off the circuit to be

measured, then change the setting of the rotary switch and the

position of the red lead and switch on the circuit again.

· Do not under any circumstances change the range or disconnect

the leads while measuring. This may give rise to switching current

spikes and overvoltages which can damage the multimeter or blow

the fuses unnecessarily.

· To minimise overheating and to prevent thermal drift, measure-

ments in the high current range (10A) should be limited to a few tens

of seconds.

3.4.6 - AC CURRENT MEASUREMENT3.4.6 - AC CURRENT MEASUREMENT

3.4.6 - AC CURRENT MEASUREMENT

· Ranges are selected in the same manner as for DC current

measurement (manual mode).

· Connect the black lead to the COM terminal and the red lead to

the mA terminal to measure currents less than 200mA, or to the A

terminal to measure currents up to 10A.

Metrix MX 20 User Manual

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