HT instruments HT157 User Manual
Page 58
HT155 - HT157
EN - 56
10. TECHNICAL
SPECIFICATIONS
10.1. TECHNICAL
SPECIFICATIONS
Uncertainties are referred to a temperature of 23°C±5°C with relative humidity <80%UR
Measuring range
Weighting type A:
25
140dB
Weighting type C:
30
140dB
Weighting type Z:
35
140dB
SLM level Peak C:
50
143dB
Ranges [dB]
0
90
10
100 20 110 30 120 40 130 50 140
Weighting A
25
90
25
100 25 110 30 120 40 130 50 140
Weighting C
30
90
30
100 30 110 30 120 40 130 50 140
Weighting Z
35
90
35
100 35 110 35 120 40 130 50 140
Peak C
50
93
50
103 50 113 50 123 60 133 70 143
CAUTION
For sensitivity values <50mV/Pa, the measuring range is higher. For
example, with a microphone with a sensitivity of 40mV/Pa (-28dB), the
measuring range increases by 2dB and the reference value on the display
passes to range 42
132dB
We recommend using a ½” pre-polarized microphone with a sensitivity of
50mV/Pa, frequency range: 10Hz
20kHz, basic noise <16dB(A)
Linear dynamic range:
>90dB
Resolution:
0.1dB
(statistic), 0.01dB (1/1 and 1/3 octave)
Frequency
range:
10Hz
20kHz (0.2dB); 1Hz 23kHz (1.0dB)
Gain range:
-10dB, 0dB, 10dB, 20dB, 30dB, 40dB
Internal
error:
0.1dB
Internal noise voltage:
<4
V (1Hz 23kHz linear)
Background noise:
<13dB(A), 15dB(C), 25dB(Z)
Total noise:
<18dB(A), 23dB(C), 28dB(Z)
Voltage measuring range:
15
V 10V (TRMS)
Frequency
weighting:
A/C/Z
Time constants:
Fast, Slow, Impulse, Peak C+, Peak C-
Internal A/D converter:
24 bits
Anti-aliasing
filter:
cut-off
frequency 23.5kHz, attenuation 100dB
Sampling
frequency:
20.8
s (48kHz)
Integration
time:
1s
24h at preset or custom intervals
Internal memory:
64kByte flash memory
Memory capacity:
max 128 groups/ max 256 calibrations
Analogue output:
AC, ratio 1mV/0.1dB, max voltage 3.2V
Output
interface:
mini-USB 1.1 and 2.0 compatible
Connection to USB pen drive:
recommended TRASCEND JF V30 2GB
Microphone:
½” with prepolarized condenser with pre-amplifier,
sensitivity: 50mV/Pa, frequency range:
10Hz
20kHz, noise <16dB(A)