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PAGE 6
S
E
N
S
O
R
S
AND
INS
T
R
UM
E
NT
AT
IO
N F
O
R
MACHIN
E
CO
NDIT
IO
N
MON
ITO
RI
NG
If using a standard DC power supply, install either an ammeter and/or load resistor in line with the return
connection to the black wire.
The resistor will generate a DC voltage that is proportional to current by:
V = IR
If R = 500
and I = 6mA, then V = 3Vdc
Note:
- Resistor value must be less than: (Vsupply
– 12) x 50.
Taking Measurements
When measuring the current output from the unit, use the following formula to calculate the vibration level:
Vibration Output = (Measured Output
– 4mA) x (Full Scale Vibration Output /16mA)
Measured mA
640B90
640B91/B93
640B92/B94
4.00
0.0 ips, pk
0.0 ips, pk
0.0 ips, pk
8.00
0.125 ips, pk
0.25 ips, pk
0.5 ips, pk
12.0
0.25 ips, pk
0.5 ips, pk
1.0 ips, pk
15.75
0.37 ips, pk
0.73 ips, pk
1.47 ips, pk
20
0.5 ips, pk
1.0 ips, pk
2.0 ips, pk
Measured mA
641B90
641B91/B93
641B92/B94
4.00
0.0 ips, rms
0.0 ips, rms
0.0 ips, rms
8.00
0.125 ips, rms
0.25 ips, rms
0.5 ips, rms
12.0
0.25 ips, rms
0.5 ips, rms
1.0 ips, rms
15.75
0.37 ips, rms
0.73 ips, rms
1.47 ips, rms
20
0.5 ips, rms
1.0 ips, rms
2.0 ips, rms
Содержание IMI Sensors CS640B92
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