Setra System Model 141 - Manual

OPERATING INSTRUCTIONS
MODEL 141 ACCELEROMETER
GENERAL INFORMATION
Your Setra accelerometer has been carefully calibrated before shipment to you, and it should be
handled with the same care given any precision instrument. Setra accelerometers are rugged devices,
built to take considerable overrange of “G” loads.
Please refer to the Model 141 calibration data before proceeding further.
ELECTRICAL CONNECTIONS
Cable Lead Function
White positive excitation
Black negative excitation
Yellow positive output
Brown negative output
Red calibration signal
Shield case
CAUTION: BE ABSOULUTELY SURE OF EXCITATION POWER POLARITY BEFORE
APPLYING POWER, REVERSED EXCITATION WILL BURN OUT THE CIRCUIT
INSTANTLY.
MODEL 141A MUST NOT BE OPERATED WITH EXCITATION EXCEEDING 15 VDC.
Model 141A accelerometer excitation voltage 5 VDC to 15 VDC. Keep excitation power between 5 VDC
min. and 15 VDC maximum. High voltage may burn out the circuit. Installation of a protective Zener
diode such as a IN4746A across the excitation power input leads is a good practice, taking care to
0.225 (max)
5.715
.
Center of Seismic Mass
Also Center of Gravity of
Accelerometer (less cable)
+G
0.875 (max)
22.225
Cable Length 2 feet
Unless Otherwise Specified
0.328
8.331
4 Mounting Holes
0.125/0.3175
Dia.
±
0.002/0.0508
Within
±
0.005/
±
0.127
of True Position
0.656
16.652
Brown - Output
Black - Excitation
Yellow
+ Output
Red
Calibration
White
+ Excitation
Cable Clamp Screws
0-80 x 5/64 Pan head
Recommended Mounting Screws
No. 4-40 U.N.C. Class II
Stainless Steel Socket Head
Cap Screws 0.5/12.7 Long Minimum
0.880 SQ (max)
22.352
0.689
(max.)
0.332/ 8.432
± 0.004/0.1016
0.328
8.331
0.656
16.652
in
mm