ADM-870 05/23/08i
CONTENTS
1.0 INTRODUCTION 1
2.0 SPECIFICATIONS 2
3.0 EXTERNAL FEATURES 4
3.1 KEYPAD 4
3.2 FEATURES ON SIDES AND BACK OF METER 4
4.0 DISPLAY MESSAGES AND PROMPTS 7
4.1 READ PROMPTS 7
4.2 MEASUREMENT READOUTS 7
4.3 FUNCTION READOUTS 8
5.0 USING THE AIRDATA MULTIMETER 12
5.1 AUTOMATIC READINGS 12
5.2 MEMORY/AVERAGE/TOTAL FUNCTION 12
5.2.1 MEMORY OPERATION 12
5.2.2 RECALL 13
5.2.3 DISCARD READING 13
5.2.4 CLEAR MEMORY 13
5.2.5 ERROR 13
5.3 AUTOMATIC READING MEMORY 13
5.4 SPEED-READ FEATURE 13
5.4.1 SPEED-READ OPERATION 14
6.0 VELOCITY MEASUREMENT 15
6.1 VELOCITY CORRECTION FACTORS 15
6.2 PITOT TUBE VELOCITY MEASUREMENT 16
6.3 AIRFOIL PROBE 17
6.3.1 DUCT VELOCITY USING AIRFOIL PROBE 18
6.3.2 FUME HOODS AND SAFETY CABINETS - AIRFOIL 18
6.3.3 EXHAUST HOODS - AIRFOIL PROBE 19
6.3.4 LAMINAR FLOW WORKSTATIONS - AIRFOIL PROBE 19
6.4 VELGRID AIR VELOCITY 19
6.4.1 CHEMICAL EXHAUST HOODS - VELGRID 20
6.4.2 LAMINAR FLOW WORKSTATION - VELGRID 20
6.4.3 AIR FLOW CALCULATION FROM VELGRID VELOCITY 20
6.5 VELOCITY: LOCAL DENSITY VS STANDARD DENSITY (MASS FLOW) 22
7.0 PRESSURE MEASUREMENT 23
7.1 DIFFERENTIAL PRESSURE 23
7.1.2 PITOT TUBE "VELOCITY PRESSURES" 23
7.1.3 PITOT TUBE "STATIC PRESSURES" 23
7.1.4 PITOT TUBE "TOTAL PRESSURES" 24
7.2 ABSOLUTE PRESSURES 24
8.0 TEMPERATURE MEASUREMENT 25
8.1 TEMPROBE 25
8.2 AIRDATA MULTITEMP 25
9.0 AIR FLOW MEASUREMENT 27
9.1 FLOWHOOD FUNCTION 27
9.2 BACKPRESSURE COMPENSATION 27
10.0 FLOWHOOD ASSEMBLY 28
10.1 UNPACKING 28
10.2 FRAME CHANNELS 28
10.3 FABRIC TOPS 28
10.4 SUPPORT ASSEMBLY 28
10.5 HANDLE 29
11.0 FLOWHOOD OPERATING PROCEDURE 34
11.1 AIR FLOW - NONBACKPRESSURE COMPENSATED READINGS 34
11.2 AIR FLOW - BACKPRESSURE COMPENSATED READINGS 34
11.2.1 ERROR 35
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