HP Cell Phone Accessories 8935 Uživatelský manuál stáhnout pdf (Strana 70)

70 Chapter 3

Utility Procedures

Voltmeter

A voltmeter is available in the Test Set, and can measure low level dc or

ac voltages. The input to the voltmeter is controlled by the AF Anl In

field in the AF ANALYZER screen.

CAUTION Do not exceed the rated input to the Test Set for the DC Level and

AC Level measurements.

The connector best suited to making ac Level and dc Level

measurements is the AUDIO IN port.

Measuring AC Level and DC Level

1. Press Shift, then RF Anl (AF Anl) to go to the AF ANALYZER screen.

2. Select AF Anl In and choose Audio In.

3. Select Audio In Lo and choose Gnd. This sets the AUDIO IN LO

port to ground, which allows you to measure voltage at the AUDIO

IN HI port.

4. Attach a probe (for example a 1:1 oscilloscope probe) to the AUDIO

IN HI connector.

5. AC Level is displayed. To change to DC Level, select the AF Freq

measurement and choose DC Level from the displayed list of

choices.

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HP Cell Phone Accessories 8935 Uživatelský manuál Strana 70