Emon Data Collection

Rack mounted amplifier and filter cases

 Software:

• Name - EMON by Ted Blank

System: AT1 /2

• Normal sampling rate: Samples Per Second - 3.949
• OS - DOS3.3

System: ATE/N/Z

• Normal sampling rate: Samples Per Second - 63.875
• OS - DOS3.3

Amplifiers:

Designer: Pet Rowe

Two gain stages op-27  overall gain

Min - 2,985    1.3DB

Max - 51,740   67.3DB

Filter: Low pass 10Hz   3-poll butterworth

Model:

• Geo Space HS10

Functional Sensitivity         ( ± 10%)     2.99 V/ips                          Natural Frequency                ( ± 10%)    1 Hz

Coil Resistance                 ( ± 10%)    400 ohms

Coil Inductance                     360 mh

Damping Factor         ( ± 20%)       .031

Damping Constant              1178 2862

Displacement Limit                     0.5 in

Inertial Mass                             33 oz  

Orientation Angle            ± 5°

Mechanical

Height                    5.40 in

Diameter                4.38 in

Weight                   9.75 lbs  

 Case:

• 10 Sq Ft work area
• 20 Cu Ft volume
• Airtight seal
• 2- Lehman cement mounting pads 2x2x4-feet
• Full cement floor
• Interior insulation 2-inch Styrofoam top/sides
• Exterior 1/2-inch plywood with removable top
• 2-inch PVC cable pass through to garage interior
• Outside rain drain to remove standing water
• Metal roof 4-feet above wooden box to block wind/rain (not shown)

 Lehman boom:

Boom: Aluminum 1-inch sq

Boom length: 30cm

Initial mass: 80 oz

Pre Amp / coax driver gain: 1889

Amp/Coax power supply: +/- 12V steady supply with UPS backup provided from the seismic rack supply via the PVC cable pass through tube.

 Lehman upright support:

Base Plate: Aluminum .75x10x12-inch

Height: 20-inches

Mounting: (3) 3/8-inch 1000 lb cement anchor

Leveling: (2) 2-inch 8-32 hex head machine screw

Upper pivot : #10 machine wire from upright to turnbuckle.

Lower yoke wire: From lower turnbuckle  to boom cross bar .035 steel aircraft cable.

Lower pivot: Hardened point in cupped 8-32 hex head machine screw

 Lehman detail:

Top Photo:

Damping Magnets:   1.5Hx1.75W1.75D-inches

Flag: brass 8x2x.25-inches

Middle Photo:

Manufacturing process: Hand wound

Pickup coil 25mm diameter plastic wire frame x 10mm  x 15mm

Magnet: cow magnet

Magnet Wire size: 52 gauge

Coil Resistance: 12.5K ohms   

Lower Photo:

Manufacturing process: Machine wound

Pickup coil 14mm diameter plastic wire frame x 10mm x 7mm

Magnet: 1.375Wx.75Hx.75D

Magnet Wire size: 38 gauge

Coil Resistance: 71.5 ohms