HT instruments HT154 - Manual (Page 6)

HT154
EN - 5
4. OPERATING INSTRUCTIONS
4.1. INSTRUMENT DESCRIPTION
4.1.1. Commands description
HT154
Sound Level Meter
6
9V BATTERY
NEDA 1604 6F22 006P
PLEASE READ MANUAL
FOR SAFETY
OPEN
7
2
1
3
4 5
10
8
9
11
12
13
14
LEGEND:
1. Windscreen
2. Display
3. Frequency A/C Weighing
selector key
4. ON/OFF key
5. Level Range control key
6. MAX MIN key.
7. FAST/SLOW integration
selector key
8. Microphone
9. CAL adjust trimmer
10. AC output terminal
11. DC output Terminal
12. External DC 9V power
supply terminal
13. Tripod mounting screw
14. Battery cover
Fig. 1: Instrument description
4.1.2. Display symbols description
FAST SLOW MIN MAX
1
2
3
4
5
6
7
8
9
10
11
LEGEND:
1. FAST integration
2. SLOW integration
3. Minimum value indication
4. Maximum value
indication
5. Low battery indication
6. A Weighting curve
7. C Weighting curve
8. Over range indication
9. Range indication
10. Under range indication
11. Sound level readout
Fig. 2: Display description