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)
Summary of Contents for HT155
Page 1: ... Copyright HT ITALIA 2011 Release EN 1 02 28 12 2011 HT155 HT157 User manual ...
Page 2: ......
Page 62: ...HT155 HT157 EN 60 12 APPENDIXES 12 1 APPENDIX 1 FREQUENCY WEIGHTING CHARACTERISTICS ...
Page 63: ...HT155 HT157 EN 61 12 2 APPENDIX 2 CHARACTERISTICS OF 1 3 OCTAVE BAND FILTER ...
Page 64: ...HT155 HT157 EN 62 ...
Page 65: ...HT155 HT157 EN 63 ...
Page 67: ...HT155 HT157 EN 65 12 4 APPENDIX 4 CHARACTERISTICS OF 4HZ HIGH PASS DIGITAL FILTER ...