Presets 5 frequency and 5 level presets.
Relative levels Current level can be stored as a working level for testing
microphone inputs etc.
Tone bursts 100µs to 27 minutes, programmable frequency, level and
duration (specified to a resolution of 100µs). Sequences of
tones or tone bursts can be easily programmed, and can be
made to repeat.
Z-correction Automatic level corrections for 600
loading selectable.
J.2 LA102 Audio Measuring Set Specification
Inputs 10k and 600 selectable. Differential inputs, with L/R
selection.
Overload protection Withstands 100V rms, diode limited.
Level measurement -95 to +28dBu in 10dB ranges (autoranging/manual).
Default RMS 2Hz-100kHz -3dB, 20Hz-40kHz -0.2dB.
Options 2-5 RMS 22Hz-22kHz, VU 22Hz-22kHz, RMS A Wtd, PPM,
VU A Wtd.
High pass filter 400Hz with12dB/octave selectable.
Audio band filter selectable with 22Hz 12dB/octave, 22kHz 36dB/octave.
Level resolution Digital: 0.01dB steps. Bar graph: 0.2dB/pixel or 0.04dB/
pixel.
Level accuracy ±0.05dB +28 to -60dBu, ±0.2dB -60 to -80dBu
Frequency Reciprocal counting 20Hz-20kHz, 4-5 digit readout
Phase ±180 degrees, 20Hz to 20kHz with ±2° accuracy (up to
40kHz with reduced resolution).
Noise measurement -105 to +8dBu in 10dB ranges.
Default CCIR468-4 weighted quasi-peak.
Options 2,3,6,7 CCIR468-4 unweighted, RMS 22-22k, CCIR/ARM, CCIR
RMS.
Residual Noise -97dBu CCIR468 wtd, -107dBu RMS 22kHz.
Rumble measurement Weighted slow (IEC98) (on noise option 5). Unweighted
slow (IEC98) (on noise option 4).
Crosstalk -117 to +8dBu, narrow band measurement, automatic freq.
selection. Measured with a two stage 12dB/oct bandpass
filter. -1dB at 20% frequency error, -10dB at one octave.
Options1-6 100Hz, 315Hz, 1kHz, 6.3kHz, 10kHz, 40Hz. Telecom
Australia version has 400Hz in place of 315Hz.
196
Appendix J Specification
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