TB 9-6625-2343-40
12. Audio Measurements
a. Performance Check
(1) Press TI keys as listed in (a) through (c) below:
(a) INSTR PRESET.
(b) DATA 30.0.
(c) DATA SPCL.
(2) Reset calibrator.
(3) Connect calibrator WIDEBAND OUT to TI MODULATION OUTPUT/AUDIO
INPUT using cable and termination supplied with calibrator.
(4) Set calibrator for a wideband output frequency of 50 Hz at a level of 3 V.
(5) Press calibrator NEW REF key.
(6) If TI does not indicate within limits specified in first row of table 12, perform b below.
(7) Repeat technique of step (4) above, changing only the calibrator output
frequency to frequencies listed in table 12. If TI does not indicate within limits specified in
table 12, perform b below.
Table 12. Audio Accuracy 3 Vrms
Calibrator
Test instrument
Indications
Output
(V rms)
frequency
Min
Max
50 Hz
2.88
3.12
500 Hz
2.88
3.12
5 kHz
2.88
3.12
40 kHz
2.88
3.12
(8) Change calibrator output to a frequency of 40 kHz at a level of 100 mV.
(9) Press calibrator NEW REF key.
(10) If TI does not indicate within limits specified in first row of table 13, perform b below.
(11) Repeat technique of step (8) above, changing only the calibrator output
frequency to frequencies listed in table 13. If TI does not indicate within limits specified in
table 13, perform b below.
Table 13. Audio Accuracy 100 mV rms
Calibrator
Test instrument
Indications
Output
(mV rms)
frequency
Min
Max
40 kHz
96.0
104.0
5 kHz
96.0
104.0
500 Hz
96.0
104.0
50 Hz
96.0
104.0
(12) Change calibrator output to a frequency of 380 Hz at a level of 100 mV.
(13) Press TI keys as listed in (a) through (d) below:
(a) MEASUREMENT S (shift).