Extech Instruments 407790A User Manual page 51

Time weighting:
Main channel: Fast (125ms), Slow (1000ms), 10ms, Impulse (35ms)
Sub channel: Fast (125ms), Slow (1000ms), 10ms, Impulse (35ms)
Measurement level range:
A-weighting: 25 to 130dB
C-weighting: 33 to 130dB
Z-weighting: 38 to 130dB
Total meter range: 25dB to 130dB (A-weighting, 1kHz)
Linear operating range: 90dB
Level Range: 20 to 90dB, 20 to 100dB, 20 to 110dB, 30 to 120dB, 40 to 130dB
Sampling cycle: 20.8 µS (L
Trigger function: Controls measurement and memory store start
Level 1: Trigger level (1-dB steps) serves as threshold for starting measurement
Level 2: Single measurement is carried out when trigger level is exceeded
EXT: External trigger connector for logic-level signal with falling edge detection
TIME: Trigger event recurrence interval (trigger time) is set.
Store: Sound level values and processing results are stored in manual store or auto store mode.
Data can be stored in internal memory or on micro SD card.
Manual store: Data for measurement results and measurement start time are stored manually,
in single address increments.
Data store capacity: max. 250 data sets.
Auto store: Measurement results are stored continuously at the preset record interval time (for
Auto 1) or the preset measurement integrated time (for Auto 2), and the measurement
time.
Data store capacity: Memory capacity can be divided to 250 blocks max.
Memory capacity: See Table below (Manual/Auto storage blocks are separate)
Mode
Sound level meter
1/1-octave analysis
1/3-octave analysis
1/1 and 1/3 OCT mode
N
: 100ms)
Storage type
Flash
25087 data sets
16185 data sets
9466 data sets
7839 data sets
51
SD card
29992366 data sets
19944162 data sets
11942248 data sets
9946834 data sets
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