![background image](http://html1.mh-extra.com/html/ht/ht155/ht155_user-manual_2178086059.webp)
HT155 - HT157
EN - 57
10.2. STATISTIC ANALISYS CHARARCTERISTICS
Functions:
SLM statistic analysis in weighting A
Frequency integration with programmable period
Statistic analysis in 24 hours (24H)
Analysis type
Measured parameters (*)
Statistic
L
AFp
, L
AFmax
, L
AF5
, L
AF10
, L
AF50
, L
AF90
, L
AF95
, L
AFmin
, SD,
L
Aeq1s
, L
Aeq,T
, L
AE
, L
AfeqT.
24H L
d
, L
n
, L
dn
further to statistic analysis parameters
Integration
L
xyp
, L
xyi
, L
xeq,1s
, L
xeq,T
, L
AE
, E, C
peak+
, C
peak-
,L
AFmax
,L
AFmin
,L
AFeqT
, L
ASeqT
, L
AIeqT
(*) X = frequency weighting A/C/Z ; Y = time constants F/S/I
10.3. CHARACTERISTICS
OF ANALYSIS IN 1/1 AND 1/3 OCTAVE BAND (HT157
ONLY)
Functions:
Spectrum analysis of noise in octave band (1/1)
and 1/3 octave band with integration measure
Frequency
weighting:
A/C/Z
Spectrum analysis interface:
spectrum frequency ensemble
Total analysis interface:
realized with digital filter (see § 12.2)
Weighting Z added with high-pass digital filter (cut-off frequency: 4Hz) (see § 12.4)
Type of filter:
digital, G=2 for analysis 1/1 and 1/3 octave band
Central frequencies of 1/1 octave band:
16Hz, 31.5Hz, 63Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz, 16kHz (see §
12.2 and § 12.3)
Central frequencies of 1/3 octave band:
12.5Hz, 16Hz, 20Hz, 25Hz, 31,5Hz, 490Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz,
160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1kHz, 1.25kHz,
1.6kHz, 2kHz, 2.5kHz, 3.15kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz,12.5kHz, 16kHz
(see § 12.2)
Measured parameters (*):
L
fmeq,1s
, L
fmeq,T
, L
xyp
, L
xyi
, L
xeq,1s
, L
xeq,T
, L
AE
, E, C
peak
Tm
(*) fm = central frequency; X = frequency weighting A/C/Z ; Y = time constants F/S/I
Noise (E)’s exposure range :
0
65.535Pa
2
h
10.4. CHARACTERITICS OF PORTABLE CALIBRATOR HT151
Selectable SLM levels:
94dB and 114dB (reference 2x10
-5
Pa)
Uncertainty:
0.3dB (94dB);
0.5dB (114dB)
Reference
frequency:
1kHz
1%
Distortion:
1%
Reference standard:
IEC 60942:2003 Class 1 and ANSI S1.40:1984
Stability
time:
3s
Operating
temperature: -10°C
50°C (-14°F
122°F)
Storing
temperature:
-25°C
0°C (-13°F
158°F)
Reference
humidity:
<90%HR
Atmospheric
pressure:
65kPa
100kPa
Power supply:
1x9V battery type IEC 6F22 or NEDA 1604
Dimensions:
117(L) x 53(
) mm ; 5(L) x 2(
)”
Weight (with battery and ½” adapter):250g (9 ounces)
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 ...