The Modal Shop, Inc. A PCB Group Co.    Global Sales   Video   Newsletters   Library   About Us  
Force Limited Vibration Systems
Force Limited Vibration Systems
 
Home > Rental > Force Limited Vibration Systems

Force Limited Vibration Systems

For Precision Testing

Vibration overtesting occurs when an object under test is subjected to unrealistically severe and potentially damaging forces at the resonances of that object. Due to the high cost, long development times, and uniqueness of sophisticated aerospace and other high-tech equipment, it is important to implement techniques that prevent vibration overtesting and ensure the safety of such items during vibration qualification testing.

PCB's Force Limited Testing Systems provide the sensors that drive a closed loop control system to an existing shaker or slip table so that at frequencies where the measured force exceeds a safe limit, the controller’s output signal (input signal to the shaker) is “notched” by reducing output amplitude. Thus, reaction force between the test fixture and structure is maintained within specified limits, keeping the force experienced by the object under test within realistic and safe levels.

See the Environmental Test Brochure for detailed information on force limited vibration testing systems or the Force Sensors FAQ.


PCB Force Limited Vibration System Benefits:

  • Minimizes Over-testing
  • Reduces Risk of Damage to Critical Structures
  • Measures Summed Forces
  • Measures Force Differences (Moments)
  • Simplifies and Expedites the Test Process
  • Convenient and Easy to Implement

3-Component Quartz Force Sensors and Force Limited Vibration Test Equipment

260 Series force ring sensors simultaneously measure dynamic force in three orthogonal directions (X, Y, and Z) and must be statically preloaded for optimum performance. Preloading provides the sensing elements with the compressive loading required to allow the proper transmission of shear forces. Versions are available in various ranges up to 10k lb (45k N) in the z-axis (perpendicular to the top surface), and up to 4000 lb (18k N) in the x-and y (shear) axes.

261 Series force links eliminate the preload requirement of 3-component quartz force ring sensors, and offer a convenient, 4-screw hole mounting plate on each side of the sensor. 261 Series units are constructed by installing a 3-component force ring sensor, under preload, between two mounting plates.

Both ICP® and charge output styles are available. ICP® sensors require only a single multi-conductor sensor cable and the low-impedance voltage system is ideal for for use in harsh industrial environments. Charge output 3-component force sensors operate with in-line charge converters or conventional laboratory-style charge amplifiers. Charge output styles are recommended for higher temperature applications and can be used for quasi-static measurements with long discharge time constant charge amplifiers, or when used with charge summing modules 070M69 or 070M70 below.

Model Sensor Type Measurement Range
(lb [kN])
Low Frequency
Response -5% (Hz)
Connector
Jack Type
Used Primarily With
Cable Type:
z-axis x & y axes z-axis x & y axes
260A01/
261A01
ICP 1 000 [4.45] 500 [2.22] 0.01 0.01 1/4-28 4-pin 010G, 034G, or 078G
260A02/
261A02
ICP 1 000 [4.45] 1 000 [4.45] 0.01 0.001 1/4-28 4-pin
260A03/
261A03
ICP 10 000 [44.5] 4 000 [17.7] 0.01 0.01 1/4-28 4-pin
260A11/
261A11
Charge 1 000 [4.45] 500 [2.22] [*] [*] (3) 10-32 jacks 003G
(ends in 10-32)
003C
(ends in BNC)
260A12/
261A12
Charge 1 000 [4.45] 1 000 [4.45] [*] [*] (3) 10-32 jacks
260A13/
261A13
Charge 10 000 [44.5] 4 000 [17.7] [*] [*] (3) 10-32 jacks
260A31/
261A31
Charge** 1 000 [4.45] 500 [2.22] [*] [*] (3) 10-32 jacks
260A33/
261A33
Charge** 10 000 [44.5] 4000 [17.7] [*] [*] (3) 10-32 jacks

*Note: Resolution and low frequency response of charge mode triaxial force sensors is dependent on noise floor and discharge time constant characteristics of the signal conditioning and readout devices used. 422E series in-line charge converters allow 260 Series sensors to be powered with ICP conditioning.

**Note: Charge mode with reversed shear polarity.

Notes on cabling: Contact The Modal Shop for cable assistance. For many general purpose tests in lab conditions at or near room temperature, 010G, 034G, and 078G cables can be used interchangeably. A 2-digit suffix is added to Cable Types to denote length in feet: e.g., a model 010G20 cable mates to an ICP Force Sensor and terminates in 3x BNC, with a length of 20 ft.

 

Voltage/ICP Type to 1 000 lbf (z)

260A01

260A01 full spec

  • Hermetically sealed Stainless Steel housing
  • Though hole mounting via 5/16-24 beryllium-copper stud
  • 0.39” H x 1.075” L x 0.95” W
  • ±1000 lbf z axis, ±500 lbf x and y axis range
  • 1/4-28 4-pin jack used with 010G, 034G, or 078G series cable
 

Rental Includes:
081A70-Mounting stud, 5/16-24 UNF-2A typ each end
082B02-Anti-Friction Washer
083A10-Pilot Bushing
Calibration-NIST traceable and ISO 17025/A2LA accredited calibration; includes data to full scale operating range (PCB FCS-2). See notes on calibration for additional information

 
261A01

261A01 full spec

  • Factory preloaded force link assembly using 260A01 sensor
  • Four screw hole mounting pattern on each side
  • ±1000 lbf z axis, ±500 lbf x and y axis range
  • 1/4-28 4-pin jack used with 010G, 034G, or 078G series cable
 

Voltage/ICP Type to 1 000 lbf (z)

260A02

260A02 full spec

  • Hermetically sealed Stainless Steel housing
  • Though hole mounting via 1/2-20 beryllium-copper stud
  • 0.39” H x 1.35” L x 1.25” W
  • ±1000 lbf range, all axes
  • 1/4-28 4-pin jack used with 010G, 034G, or 078G series cable
 

Rental Includes:
081A74-Pre-load bolt
082M12-Anti-Friction Washer
083A13-Pilot Bushing
Calibration-NIST traceable and ISO 17025/A2LA accredited calibration; includes data to full scale operating range (PCB FCS-2). See notes on calibration for additional information

 
261A02

261A02 full spec

  • Factory preloaded force link assembly using 260A02 sensor
  • Four screw hole mounting pattern on each side
  • ±1000 lbf range, all axes
  • 1/4-28 4-pin jack used with 010G, 034G, or 078G series cable
 

Voltage/ICP Type to 10 000 lbf (z)

260A03

260A03 full spec

  • Hermetically sealed Stainless Steel housing
  • Though hole mounting via 7/8-14 beryllium-copper stud
  • 0.79” H x 2.25” L x 2.25” W
  • ±10000 lbf z axis, ±4000 lbf x and y axis range
  • 1/4-28 4-pin jack used with 010G, 034G, or 078G series cable
 

Rental Includes:
081A70-Mounting stud, 5/16-24 UNF-2A typ each end
082B02-Anti-Friction Washer
083A10-Pilot Bushing
Calibration-NIST traceable and ISO 17025/A2LA accredited calibration; includes data to full scale operating range (PCB FCS-2). See notes on calibration for additional information

 
261A03

261A03 full spec

  • Factory preloaded force link assembly using 260A03 sensor
  • Four screw hole mounting pattern on each side
  • ±10000 lbf z axis, ±4000 lbf x and y axis range
  • 1/4-28 4-pin jack used with 010G, 034G, or 078G series cable
 

Charge Type to 1 000 lbf (z)

260A11

260A11 full spec

  • Hermetically sealed Stainless Steel housing
  • Though hole mounting via 5/16-24 beryllium-copper stud
  • 0.39” H x 0.95” L x 0.95” W
  • ±1000 lbf z axis, ±500 lbf x and y axis range
  • (3) 10-32 coaxial jack electrical connector used with 002C or 003C series cables
 

Rental Includes:
081A70-Mounting stud, 5/16-24 UNF-2A typ each end
082B02-Anti-Friction Washer
083A10-Pilot Bushing
Calibration-NIST traceable and ISO 17025/A2LA accredited calibration; includes data to full scale operating range (PCB FCS-2). See notes on calibration for additional information

 
261A11

261A11 full spec

  • Factory preloaded force link assembly using 260A11 sensor
  • Four screw hole mounting pattern on each side
  • ±1000 lbf z axis, ±500 lbf x and y axis range
  • (3) 10-32 coaxial jack electrical connector used with 002C or 003C series cables
 

Charge Type to 1 000 lbf (z)

260A12

260A12 full spec

  • Hermetically sealed Stainless Steel housing
  • Though hole mounting via 1/2-20 beryllium-copper stud
  • 0.39” H x 1.25” L x 1.25” W
  • ±1000 lbf range, all axes
  • (3) 10-32 coaxial jack electrical connector used with 002C or 003C series cables
 

Rental Includes:
081A74-Pre-load bolt
082M12-Anti-Friction Washer
083A13-Pilot Bushing
Calibration-NIST traceable and ISO 17025/A2LA accredited calibration; includes data to full scale operating range (PCB FCS-2). See notes on calibration for additional information

 
261A12

261A12 full spec

  • Factory preloaded force link assembly using 260A12 sensor
  • Four screw hole mounting pattern on each side
  • ±1000 lbf range, all axes
  • (3) 10-32 coaxial jack electrical connector used with 002C or 003C series cables
 

Charge Type to 10 000 lbf (z)

260A13

260A13 full spec

  • Hermetically sealed Stainless Steel housing
  • Though hole mounting via 7/8-14 beryllium-copper stud
  • 0.79” H x 2.25” L x 2.25” W
  • ±10000 lbf z axis, ±4000 lbf x and y axis range
  • (3) 10-32 coaxial jack electrical connector used with 002C or 003C series cables
 

Rental Includes:
081A71-Mounting stud, 7/8-14 UNF-2A typ each end
082B06-Anti-Friction Washer
083A11-Pilot Bushing
Calibration-NIST traceable and ISO 17025/A2LA accredited calibration; includes data to full scale operating range (PCB FCS-2). See notes on calibration for additional information

 
261A13

261A13 full spec

  • Factory preloaded force link assembly using 260A13 sensor
  • Four screw hole mounting pattern on each side
  • ±10000 lbf z axis, ±4000 lbf x and y axis range
  • (3) 10-32 coaxial jack electrical connector used with 002C or 003C series cables
 

Reverse Shear Polarity Charge Type to 1 000 lbf (z)

Note: This sensor is the same as 260A11, except polarity is reversed for the x and y axes. This is useful for instrumenting a large test article with multiple force sensors on each side. Utilize half 260A11 and half 260A31 so all sensors have connectors in easily accessible locations.

260A31

260A31 full spec

  • Reversed Shear Polarity
  • Hermetically sealed Stainless Steel housing
  • Though hole mounting via 5/16-24 beryllium-copper stud
  • 0.39” H x 0.95” L x 0.95” W
  • ±1000 lbf z axis, ±500 lbf x and y axis range
  • (3) 10-32 coaxial jack electrical connector used with 002C or 003C series cables
 

Rental Includes:
081A70-Mounting stud, 5/16-24 UNF-2A typ each end
082B02-Anti-Friction Washer
083A10-Pilot Bushing
Calibration-NIST traceable and ISO 17025/A2LA accredited calibration; includes data to full scale operating range (PCB FCS-2). See notes on calibration for additional information

 
261A31

261A31

  • Reversed Shear Polarity
  • Factory preloaded force link assembly using 260A31 sensor
  • Four screw hole mounting pattern on each side
  • ±1000 lbf z axis, ±500 lbf x and y axis range
  • (3) 10-32 coaxial jack electrical connector used with 002C or 003C series cables
 

Reverse Shear Polarity Charge Type to 10 000 lbf (z)

Note: This sensor is the same as 260A13, except polarity is reversed for the x and y axes. This is useful for instrumenting a large test article with multiple force sensors on each side. Utilize half 260A13 and half 260A33 so all sensors have connectors in easily accessible locations.

260A33

260A33 full spec

  • Reversed Shear Polarity
  • Hermetically sealed Stainless Steel housing
  • Though hole mounting via 7/8-14 beryllium-copper stud
  • 0.79” H x 2.25” L x 2.25” W
  • ±10000 lbf z axis, ±4000 lbf x and y axis range
  • (3) 10-32 coaxial jack electrical connector used with 002C or 003C series cables
 

Rental Includes:
081A71-Mounting stud, 7/8-14 UNF-2A typ each end
082B06-Anti-Friction Washer
083A11-Pilot Bushing
Calibration-NIST traceable and ISO 17025/A2LA accredited calibration; includes data to full scale operating range (PCB FCS-2). See notes on calibration for additional information

 
261A33

261A33

  • Reversed Shear Polarity
  • Factory preloaded force link assembly using 260A33 sensor
  • Four screw hole mounting pattern on each side
  • ±10000 lbf z axis, ±4000 lbf x and y axis range
  • (3) 10-32 coaxial jack electrical connector used with 002C or 003C series cables
 

Chassis and Power Modules

443B102

443B102 full spec

  • Dual Mode single channel amplifier for ICP® and charge output sensors
  • Able to be DC coupled to allow the preload of 260 series force sensors to be set during installation
  • Includes sectable gain, discharge time constant, and high and low pass filters
  • Requires chassis (441A39) with power supply (441A101)
070M69

070M69 full spec

  • Computational Signal Conditioner computes the difference and outputs up to four pairs of signals
  • Provides output summation of the differences
  • Can be used with voltage signals or supplies constant current excitation for ICP® sensors
  • 0.1x, 1x, 10x gain
  • 8 BNC input
  • 4 BNC differenced outputs, one BNC summed difference output
  • Requires chassis (441A39) with power supply (441A101)
070M70

070M70 full spec

  • Charge Summing Patch Panel allows the addition of up to eight charge inputs and sums them to provide one charge output
  • 8 BNC inputs
  • 1 BNC output
  • Summed output (A + B + C + D + E + F + G + H)
  • Requires chassis (441A39)
070A15

070A15 full spec

  • Charge Summing block
  • (4) 10-32 jack inputs to (1) BNC output
  • for use with charge output sensors only
  • Typical Use: Measuring force over a large surface area using a plate with one force sensor under each corner. Sums force signals and sends resulting summed charge signal to single charge amplifier
  • Requires chassis (441A39)
 

441A39 more information

  • 9-Slot Chassis
 

441A101 full spec

  • AC Power Supply