Specifications

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