ACCEPTANCE TESTING
6-11
LF output
Specification
Level accuracy:
±
5% for levels above 50 mV
±
10% for levels from 500
μ
V to 50 mV
(With a load impedance >10 k
Ω
)
Frequency response:
Typically better than 1 dB from 0.1 Hz to 300 kHz
Test equipment
Description Minimum
specification Example
Digital multimeter
DC to 300 kHz, 1 mV to 5 V
Datron 1061A
Audio analyzer
Capable of measuring 0.5 mV
±
3% and levels at
10 Hz
Rohde & Schwarz
UPA3
Level accuracy
Test procedures
C0220
LF
OUTPUT
UUT
Digital Multimeter
INPUT
➤
Fig. 6-6 Level accuracy test set-up
(1) Connect the test equipment as shown in Fig. 6-6.
(2) Set the UUT to give an LF output of 5 V at 1 kHz as follows:
[LF]
[LF Gen]
[LF Freq]
1 kHz
[LF Level]
5 V
(3) The level measured on the digital multimeter should read 5 V
±
0.25 V.
(4) Check the LF output of the UUT at the levels indicated in Table 6-7. Check that the measured
levels are within specification.
Table 6-7 Level accuracy output levels
LF output levels (V)
5.0000 0.1000 0.0050
2.0000 0.0500 0.0020
1.0000 0.0200 0.0010
0.5000 0.0100 *0.0005
0.2000
*For the last measurement it will be necessary to use the audio analyzer. Connect the test
equipment as shown in Fig. 6-5.