Agilent Technologies 54622D Especificaciones descargar pdf (Pagina 24)

Measuring Resistance

Key points:

 NEVER measure resistance in a "live" circuit. Turn off all power to the circuit.

 If an ohmmeter is used in a "live" circuit, at best you will get incorrect readings; at worst

you can seriously damage the DMM.

 You must insert the ohmmeter leads across the two points in a circuit for which you

want to measure the resistance. Use the red and black input jacks as shown below.

 Use the red and black input jacks (on the right) as shown below.

 You can use the rear panel red and black input jacks also (be sure to select front or rear).

 If you use front and rear, you can easily and quickly select one of two voltages.

 The DMM will Autorange, unless you override it by selecting a range.

 You can choose the number of digits displayed, using the DIGITS buttons.

 Be sure to select ΩΩ

ΩΩ

2W (ohms, two-wire).

 ΩΩ

ΩΩ

4W (ohms, four-wire) is a more complex measurement that gives greater accuracy by

eliminating the contact resistance (of the leads to the device under test).

 Make sure your hands don't contact both test leads; if they do, then you're measuring the

device under test in parallel with you.

 See User's Guide page 216 for the test current for each resistance range.

Use these two red

and black terminals.

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Agilent Technologies 54622D Especificaciones Pagina 24