... sound and noise of short duration can form spectrum analyzer with external filterfrequency range : 10HZ-20KHZbasic configuration: main machine, ... F), Slow(S), Impulse (I). Max hold, with AC/DC signal output connectorCan be equipped with filter connectorOverload indicationFull scale +10± ... holeWith AC accessories, it can be used to test with external 220v. Sound calibratorTL 6020 (94dB,1000Hz), TL6020A ...