Agilent Technologies U3401A Manual de Serviço descarregar pdf (Página 42)

1Getting Started

24 U3401A User’s and Service Guide

Performing diode and continuity Test

The diode test measures the forward voltage of a semiconductor junction

of approximately 0.5 mA. The beeper will emit a single beep tone when

the input voltage is below +0.7 V (approximately 1.4 kW) and emits a

continuos beep tone when the input voltage is below 50 mV

(approximately 100 W).

• Measurement method: 0.83 mA±0.2% constant current source, open-circuit voltage limited to <5 V

• Continuity threshold: 10 Ω fixed

• Input protection: 500 V DC or AC RMS

To test a diode, switch the circuit power off, and remove the diode from

the circuit. Then proceed as follows:

1 Press to toggle the diode and continuity function. The default

function is diode measurement.

2 Connect the red and black test leads to the input terminal as shown in

Figure 1- 16 on page 25.

3 Connect the red test lead to the positive terminal (anode) of the diode

and the black test lead to the negative terminal (cathode). Refer to

Figure 1- 16 on page 25.

4 Read the display.

5 Reverse the probes and measure the voltage across the diode again as

shown in Figure 1- 17. Assess the diode according to the following

guidelines:

• A diode is considered good if the multimeter displays OL in reverse

bias mode.

CAUTION

Disconnect circuit power and discharge all high-voltage capacitors before testing

diodes to avoid damaging the multimeter.

NOTE

The cathode of a diode is indicated with a band.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 116 117

Sem comentários

Agilent Technologies U3401A Manual de Serviço Página 42