Larson Davis 831 - 1;1 and 1;3 Octave Filters

Model 831 Manual 1/1 and 1/3 Octave Filters A-21
The Model 831 SLM complies with the European Community EMC Directive (2004/108/EC) and also
the Low Voltage Safety Directive (2006/95/EC) by meeting the following standards:
• IEC61326-1:2005: Electrical equipment for measurement, control and laboratory use - EMC
requirements.
•IEC61000-4-2:2008 Electrostatic discharge (ESD) immunity.
± 4kV contact discharges and
± 8 kV air discharges.
•IEC61000-4-3:2006 Radiated, radio frequency, electromagnetic field immunity. 26 MHz to 1
GHz at 10 V/m, 1.4 GHz to 2 GHz at 3 V/m, 2.0 GHz to 2.7 GHz at 1 V/m with 1 kHz 80%
AM.
•IEC61000-4-4:2004 Electrical fast transient (EFT)/burst immunity.
±2 kV (5/50 ns, 5 kHz).
•IEC61000-4-6:2008 Immunity to RF conducted line disturbances. 10 V, 1 kHz 80% AM from
150 kHz to 80 MHz.
•IEC61000-4-8:2001 Power frequency magnetic field immunity. 80 A/m. 50/60 Hz.
•CISPR 11:2009: Industrial, scientific and medical (ISM) radio-frequency equipment - Elec-
tromagnetic disturbance characteristics - Limits and methods of measurement Class B
• IEC61010-1:2001 Safety requirements for electrical equipment for measurement, control and labo-
ratory use - Part 1: General Requirements.
1/1 and 1/3 Octave Filters
The 1/1 and 1/3 octave filters (Option 831-OB3) comply with all requirements of IEC 61260 Ed 1.0
(1995-08) including amendment 1 (2001-09) for Class 1 and all requirements of ANSI S1.11-2004 and
ANSI S1.11-1 for Class 1. These digital filters are sampled at a rate of 51,200 samples per second,
with base X10 center frequencies and having real-time performance for all filters. The 0 dB gain
setting is the reference range and the reference input signal is 1 Volt rms at 1 kHz.
When testing filters, an ADP092 adaptor should be used. If this is not available, a 2-pole filter with
cutoff frequency of 75 kHz can be used as an alternative.
Frequency Range
1/1 Octave Filters: 8 Hz to 16 kHz
1/3 Octave Filters: 6.3 Hz to 20 kHz
Filter Shape
The following figure represents the filter shape for the 1/3 octave band centered at 1 kHz. Overlaid
with this curve is the limit curves associated with IEC 61260 Ed 1.0 (1995-08) Class 1.