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208 Chapter 8

Performance Tests

Oscilloscope Amplitude Accuracy Performance Test 18

Oscilloscope Amplitude Accuracy

Performance Test 18

The purpose of this test is to verify that the Test Set meets the

specification limits in PTR (Performance Test Record) Table 9-18,

“Oscilloscope Amplitude Accuracy Test 18 Record,” on page 268. A 5 V

ac signal from the audio analyzer is measured by both an external multi

meter and by the Test Set’s internal oscilloscope. Since the oscilloscope

reads peak volts, the RMS reading of the multi meter is multiplied by

the square root of two.

Figure 8-23 Setup

Procedure

1. Set the digital multimeter to measure ac volts.

2. On the Test Set:

a. Press

Preset.

b. Select the AF ANALYZER screen.

c. Set the AF Anl In field to Audio In.

d. Set the Filter 2 field to >99kHz LPF.

e. Set the Audio In Lo field to Gnd.

f. Select the SCOPE screen.

g. Set the Controls field to Marker and move the cursor to the

Marker To Peak+ field.

3. Set the audio analyzer’s source to 1 kHz and 5 V and fine adjust the

level until the voltmeter reads 5 V.

OUTPUT

AUDIO IN HI

Audio Analyzer

Multimeter

INPUT

1 2 ... 204 205 206 207 208 209 210 211 212 213 214 ... 342 343

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