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Operations Manual
The following are global non-programmable power-up conditions:
Meter Reference Level:
Signal Analysis Screen
The Signal Analysis screen enables measurement of a single sine-tone frequency, amplitude, and THD+N
(total harmonic distortion plus noise) of a digital audio signal. The user may select L or R (Left or Right
channel), and AUTO or MANUAL mode.
To change screen parameters press ENTER to introduce and move the cursor and UP/DOWN CURSOR
buttons to select channel (L/R) or mode (AUTO/MANUAL).
Pressing the GO button activates the analysis routine. The Model 3000S starts the analysis by measuring
and displaying the incoming tone frequency. The next measurement shows wide-band amplitude in dB full
scale. The third measurement is THD+N. The unit will update THD+N results about every 1.5 seconds,
depending on input sample rate.
AUTO mode enables the Model 3000S to lock to the incoming tone frequency. MANUAL mode sets the
analysis frequency to the frequency programmed by the TEST TONE SCREEN. This allows the notch
filter to be manually tuned by the user.
The Model 3000S's test tones may be used simultaneously with the THD+N measurement with input
sample rates below 50 kHz. To do so, first go to the test tone screen and press GO. Then go to the
THD+N screen and press GO. Tone will be output while the THD+N test is being done. This allows
looping through external digital devices for testing. Tones are automatically output in full 24 bit word
length. NOTE: connecting the Model 3000S's output to its own input can cause feedback. The Model
3000S should be set to an internal sample frequency (not BYPASS) on the main screen for loop-through
tests.
Amplitude and THD+N are expressed in dB referenced to full scale. Display accuracy is 0.25 dB for
amplitude from 0 dB to -120 dB and frequencies from 120 Hz to 20 kHz at input sample rates below 50
kHz.
High frequency analysis (input sample rate 88.2 or 96 kHz) is available only if 44.1 kHz or 48 kHz crystal
operation is selected. Tone range is from 500 Hz to 43000 Hz in this mode.
10
Boost/Cut:
Delay:
FINE Mode:
LED Intensity:
THD Channel:
THD Mode:
L: 10000 Hz
THD+N: -122.50 dB AUTO
OFF
OFF
OFF
0 dB
Low
Left
AUTO
-20.00 dB
LE3000S
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