JEWELL 781, Руководство пользователя

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B-88-1006, REV. B 10
APPENDIX B - Custom Specifications for your Equipment
Signal Conditioning Unit Serial No.:____________
Transducer Wire Colors
The wire colors of the tilt and temperature transducers shipped with this unit correspond to
the following functions (see Section 2.1):
Transducer Ser. No._________ Transducer Ser. No._________ Transducer Ser. No._________
Function Wire Color Function Wire Color Function Wire Color
+ + +
E E E
- - -
Transducer Ser. No.________ Transducer Ser. No.________ Temperature Sensor
Function Wire Color Function Wire Color Function Wire Color
+ + T1 Red
E E T2 Orange
- - T3 Yellow
Filters
Your SCU has two single-pole RC low-pass filters (integrators) selected by the FILTER switch
on the front panel. The time constant (
τ
) for each filter setting is listed below.
After an instantaneous change in tilt, the output signal settles to 90% of this value after three
time constants, and to 98% of this value after four time constants. The corner or cutoff
frequency
ƒ
c
is defined as the frequency at which signal attenuation is 3 dB. Filter roll-off above
the corner frequency is constant at 6 dB per octave (20 dB per decade). Corner frequency can
be calculated as:
ƒ
c
= 1/(2 πτ )
τ values for filter settings:
ON: _________ seconds OFF: _________ seconds
Scale Factors
Your Signal Conditioning Unit has been calibrated for operation with the tilt transducers listed
below. However, it will operate any Jewell Instruments tilt transducer. If you purchase new tilt
transducers for use with the SCU, they should be calibrated with the SCU prior to use. Jewell
Instruments will perform these calibrations if the Signal Conditioning Unit is shipped prepaid to
our factory at the time the order for new transducers is place.