Operating instructions

ACCEPTANCE TESTING
5-13
AF output tests
Audio generator output level
Specification
Level range:
0.1 mV to 4 V RMS
Accuracy:
±5% ± resolution 50 Hz to 15 kHz
Test equipment
Description Minimum specification Example
DVM 1 % accuracy 50 Hz to 15 kHz Solatron 7150+
C2588
DVM
VOLTMETER
INPUT
TERMINALS
AF GEN
OUTPUT
UUT
Fig. 5-9 Audio generator level accuracy checks
(1) Refer to Results table 5-12 on page 5-35. C
onnect the test equipment as shown in Fig. 5-9,
connect
ing the UUT AF Gen output socket to the DVM voltmeter input terminals.
(2) Set the DVM to measure Volts AC RMS.
(3) Set the UUT to [AF TEST], [Audio Gen] 1 [FREQ] 1 kHz, [LEVEL] 4 V. Audio Gen 1
should be set to Sinewave and Audio Gen 2 should be OFF. Check that the DVM reads the
level set ±5% ± 1 mV. Repeat with frequencies of 50 Hz, 150 Hz, 500 Hz, 2 kHz, 5 kHz,
10 kHz and 15 kHz in turn, checking that the DVM reads the level set ±5% ±1 mV.
(4) Set the UUT to [AF Gen 1], [FREQ] 1 kHz, [LEVEL] 20.0 mV. Repeat with the level set to
400 mV. Check that for each level the DVM reads the level set ±5% ±0.1 mV. Repeat with
the level set, in turn, to 1000 mV, 2000 mV and 3000 mV, and check that in each case the
DVM reads the level set ±5% ±1 mV.
(5) Refer to Results table 5-13 on page 5-35. R
epeat the above checks for AF Gen 2 with AF
Gen 1 swi
tched OFF.