Detachable Probe Sound Meter 840012 Instruction Manual SPER SCIENTIFIC LTD.
CONTENTS 1. Introduction ............................................................................. 3 2. Meter Description .................................................................... 3 3. Operating Instructions 3-A Measuring Procedures .................................................. 4 3-B Hold ............................................................................... 4 3-C Rec. Max/Min................................................................. 4-5 3-D Max. Hold ..........
1. INTRODUCTION Features a detachable probe for easy replacement, and both RS232 computer interface and AC outputs. Also has A and C decibel frequency weighting scales, fast or slow time weighting, and two hold functions. Meets IEC651 and ANSI S1.4 specifications for a type 2 sound meter. Covers 30~130 dB in both Manual and Auto ranging scales with 0.1 dB resolution and an accuracy of ±1.5 dB. Calibrate in compliance with OSHA using Acoustical Calibrator 840031 or equivalent.
3. OPERATING INSTRUCTIONS 3-A. MEASURING PROCEDURES - See section 2, page 3 for button locations and descriptions. • • • • • • • • • • • • • • • Connect the BNC PLUG (4) to the BNC SOCKET (5). Slide the PROBE HANDLE (3) into the PROBE HOLDER (2) (opt). Press the POWER (7) button to turn the unit on. The default mode is: Auto range, “A” frequency weighting and Fast time weighting. To change the frequency weighting, press the A/C (11) button. The "A" frequency weighting simulates human ear response.
Note: The Max/Min values are frozen and not updated until the meter returns to recording mode. • To return to recording mode, press the HOLD (8) button. "REC" is displayed without "Max" or "Min". • To erase the recorded Max/Min values and exit the recording mode, press the REC MAX/MIN (9) button for at least 2 seconds. 3-D. MAX HOLD: (Holds the max measurement on the display.) • • • Press the MAX HOLD (10) button, “P.H” appears on the LCD. Press the MAX HOLD (10) button again to exit this function.
3-H. AUTOMATIC SHUT OFF After approximately 10 minutes without activity (with no buttons pushed), the meter will automatically shut off. To disable this feature, press the REC (9) button. 3-I. BATTERY REPLACEMENT When the low battery icon is displayed, open the BATTERY (18) compartment to install a fresh 9V alkaline or heavy duty type battery. In-spec measurements may be made for several hours after the icon appears. 3-J. RS232 PC SERIAL INTERFACE The instrument features RS232 (16) output via a 3.
4. SPECIFICATIONS Display Measurement Range 2” x 1.25” LCD (52x32mm), 5 digits with indicator. dB ( A & C Frequency Weighting), Response (Fast, Slow), Hold, Memory (Min/Max), Max. Hold, AC Output, RS232 Output 30 -130 dB Resolution 0.1 dB Range Selector Accuracy 30~80dB, 50~100dB, 80~130dB, 50dB on each step, over/under range indicator. Auto Range: 30 ~ 130dB ±1.5 dB Frequency 31.5 Hz to 8,000 Hz Functions Microphone Electric condenser microphone, Dia. .5” (12.
5. FREQUENCY WEIGHTING (A and C) CHARACTERISTICS: Meets IEC 651 type 2, calibrating input signal on 94 dB (31.5Hz to 8kHz). Frequency dB A dB C Tolerance dB 31.5 -39.4 -3 ±3 63 -26.2 -0.8 ±2 125 -16.1 -0.2 ± 1.5 250 -8.6 0 ± 1.5 500 -3.2 0 ± 1.5 1k 0 0 ± 1.5 2k 1.2 -0.2 ±2 4k 1.0 -0.8 ±3 8k -1.1 -3 ±5 6.
