Agilent Technologies 34401A Bedienungsanleitung PDF herunterladen (Seite 3)

Measuring Resistance

Key points:

¾ NEVER measure resistance in a "live" circuit. Turn off all power to the

circuit.

¾ If an ohmmeter is used in a "live" circuit, at best you will get incorrect

readings; at worst you can seriously damage the DMM.

¾ 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.

¾ Use the red and black input jacks (on the right) as shown below.

¾ You can use the rear panel red and black input jacks also (be sure to

select front or rear).

¾ If you use front and rear, you can easily and quickly select one of two

voltages.

¾ The DMM will Autorange, unless you override it by selecting a range.

¾ You can choose the number of digits displayed, using the DIGITS buttons.

¾ Be sure to select Ω 2W (ohms, two-wire).

¾ Ω 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).

¾ 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.

Use these two red

and black terminals.

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