HT Italia HT55 User manual

HT CALTEK ASIA LIMITED
Due to our policy of continual product development we reserve the right to amend the specifications of all mentioned products without notice.
HT55_v01
Created on 1/31/2007 4:32:59 PM
Prepared by Fung Page 1 of 4
Accessories:
• HT55 sound level probe
• Serial cable for instrument connection
• Windscreen protection
• Soft carrying bag
• Battery
• Calibration certificate
• CE Declaration
• Instruction manual
Warranty card
Standards
CE mark
IEC 651
HT55
Transducer Probe for Sound Level Measurement Type 1
HT55 accessory is a transducer probe with built-in integrator for
Leq and Sound Level Pressure measurements in connection with HT
ITALIA analyzer/recorder meters be able with this function. Tests
are performed according to EN60804 and EN60651 (Type 1)
standards concerning noise controls on working environments.
HT55 probe have a RS-232 D-9pin serial interface for instrument
connection and a standard ½" pre-polarised microphone.
Functions:
• Type 1 Leq measurement
• SLP peak value measurement
• Class "A" frequency weighting
• Pre-polarized microphone with integrated amplifier
• Manual calibration with trimmer
• RS-232 serial interface

HT CALTEK ASIA LIMITED
Due to our policy of continual product development we reserve the right to amend the specifications of all mentioned products without notice.
HT55_v01
Created on 1/31/2007 4:32:59 PM
Prepared by Fung Page 2 of 4
1. TECHNICAL SPECIFICATIONS
LEQ MEASUREMENTS
• Lower limit: 0.0 dB.
• Upper limit: 137.0 dB.
• Higher Limit with Crest Factor 3: 130.0 dB.
• Range: 50.0 ÷ 120.0 dB.
• Electrical Noise at 20°C (without preamplifier): 30.0 dB (tipycal).
• Electrical Noise + Thermal at 20°C (with preamplifier): 32.0 dB (tipycal).
• Lpeak – Lower limit: 70.0 dB
• Lpeak – Upper limit: 140.0 dB
INTEGRATOR (Leq function: according to EN60804:1994/A2 type 1)
• Range in Linearity: 90.0 dB
• Range for Pulses: 55.0 dB
• Response time to stationary signals: 2s
FREQUENCY WEIGHTING (according to EN60651:1994/A1 type 1)
Function Weighting curve
Leq “A”
Lpicco linear
In the following table please find the response curve corresponding to “A” weighting and the uncertainty
depending on frequency:
Frequency (Hz) Weighting A (dB) Uncertainty for Type 1 (dB)
16
-56.7 +3,-∞
31.5
-39.4 ±1.5
63
-26.2 ±1.5
125
-16.1 ±1
250
-8.6 ±1
500
-3.2 ±1
1000
0 ±1
2000
+1.2 ±1
4000
+1.0 ±1
8000
-1.1 +1.5;-3
16000
-6.6 +3,-∞
MICROPHONE
• Pre-polarized Condenser Microphone with built-in preamplifier.
• Rating Sensitivity under reference conditions: 16 mV/Pa
• Equivalent impedance: 3000 Ω(typical)

HT CALTEK ASIA LIMITED
Due to our policy of continual product development we reserve the right to amend the specifications of all mentioned products without notice.
HT55_v01
Created on 1/31/2007 4:32:59 PM
Prepared by Fung Page 3 of 4
2. GENERAL SPECIFICATION
Reference conditions:
• Environment: free space.
• Reference direction: perpendicular to microphone’s diaphragms
• Reference Sound Pressure (referred to 20 µPa): 94.0 dB
• Reference Frequency: 1000 Hz
• Reference Temperature: 20°C
• Reference Humidity: 65%
• Atmospheric Pressure: 103 mbar
Presetting time:
• 30 sec
Power supply:
• Battery 9V type NEDA1604, JIS006P, IEC6F22 alkaline
• Battery life: about 30 hours of no-continuous use
• Low battery indication.
RS232 interface:
• 9 pin D-type connector (8bit, 1 stop bit, no parity, 9600 Baud).
Working temperature:
• -10°C to 50 °C , 0 - 90 % R.H.
Storage temperature:
• -20°C to 60°C, 0 - 90 % R.H.
• Max altitude: 2000m
Mechanical characteristics:
• Sizes: 260(L) x 62(W) x 19(H)mm
• Weight (included battery): about 600 g
Reference standards:
• EN 60651:1994/A1 type 1
• EN 60804: 1994/A2 type 1
Hong Kong Office
Address: Flat E, 12/F, Effort Industrial Building, 2-8 Kung Yip Street, Kwai Chung, N.T., Hong Kong
Email: Tel: [phone] Fax: [phone] [e-mail]
Level 15, Suite 27, Prudential Tower, 30 Cecil Street, Singapore 049712
Email: Tel: [phone] Fax: [phone]
Singapore Office
caltek sg caltek com hk _ @ . .
HT CALTEK ASIA LIMITED www.htcaltek.com

HT CALTEK ASIA LIMITED
Due to our policy of continual product development we reserve the right to amend the specifications of all mentioned products without notice.
HT55_v01
Created on 1/31/2007 4:32:59 PM
Prepared by Fung Page 4 of 4