The Model 921A Displacement-Force Test Station is a precise and versatile instrument for measuring force and displacement parameters. It can perform up to 5,000 data points in a single test to ASTM standards under both standalone and PC-controlled operation. An optional engineering mode provides high resolution test data that can be displayed and printed in tabular or graphic formats.

1. Model 921A Displacement-Force Test Station
Accurate, fast, repeatable testing of displacement and force
Test to ASTM standards with optional resistance channel
PC-interactive or standalone operation
Provides in-depth test data to fulfil customer requirements
User friendly Tactile Operations® for Windows™ control
and analysis software package
Up to 5,000 data points per test
Displays test data in tabular or graphic formats
Versatile test head can be mounted to meet user's needs
Eliminates deflection errors by automatic compensation
Engineering Mode
In addition to providing test data for all tested paramters listed above, this mode:
Provides access to test data having a displacement resolution of 0.00254mm (0.0001 inch);
up to 5,000 data points per test
Permits viewing and printing the engineering data graph and test results from the 921A software menu
Resistance/Voltage Channel
Resistance range of 0-16 k or voltage range of 0-4V; other resistance/voltage ranges available
Measures resistance for tactile and non-tactile switches. Tests the following additional parameters:
MAKE' BREAK' LOW' MAKE' BREAK' LOW' MAX' MIN' MAKE' BREAK' RESTORE' LOW
ASCII Conversion Utility
Converts test data to comma-delimited ASCII text for easy transfer to database, spreadsheet and SPC programmes
Test Fixtures
42.5H x 45.7W x 45.7D cm 42.5H x 30.5W x 30.5D cm
(16¾H x 18W x 18D inches) (16¾H x 12W x 12D inches)
14.2kg (31.5Ibs) 7.8kg (17Ibs)
F F F T T T R R R R R R
DFR Tester
Grid Thick Both ForceIn Out
Engineering Data
Displacement (mm)
Force(kg)
0.5
0.4
0.3
0.2
0.1
0.0
0.0 0.2 0.4 0.6 0.8

2. The Model 921A Displacement-Force Test Station is designed to obtain precise force measurements relative to displacement.
It performs tests for seperate operator-programmed parameters.
An optional resistance/voltage channel may be added to test electrical parameters.
The 921A is used to test membrane switches (including polydomes, metal domes, elastometric and conventional keypads), rubbers,
plastics, keyboards - virtually any component where accurate displacement-force measurements are required.
Operating modes include:
Local - Standalone (pass/fail) operation
PC -A personal computer interfaces with the 921A and is used to configure test paramaters, as well as view, store and print test results
An optional engineering mode, where test data having a displacement resolution of 0.00254mm (0.0001inch) is accessible by the user
In the engineering mode, up to 5,000 data points are obtained and stored during a single test.
Test data can be displayed and printed in tabular or graphic formats.
Interchangeable force sensors ranging from 0-75.0g (0-2.65oz) to 0-20.4kg (0-45.0lbs) are available.
The 921A also permits the user to change and use different probe tips.
Invaluable as a test tool for qualifying first article product, audit testing, engineering investigation, inspection and life study tests,
the 921A can also be used in automated production areas. When integrated with an automatic feed or an x-y positioner,
the 921A functions as a cost-effective automated test station ideal for a wide variety of production applications.
The tactile Operations®for Windows™software package controls and monitors the 921A test station.
It provides for storage, viewing and printout of test results, as well as graphic representations.
Accurate, indepth test data is recorded to support statistical process control (SPC) systems.
This data can easily be transferred to a database, spreadsheet and SPC programmes using our ASCII converstion utility programme.
The 921A is one of the most versatile, accurate and cost effective test stations of its' kind.
It features accuracy levels equal to or exceeding those of much more expensive, dedicated systems.
Power Requirements - 115/220 V ac, 50/60 Hz 230 VA
Test Speed
As fast as 8mm/s (0.32 inch/s); as slow as 0.0254mm/s (0.001 inch/s)
Measurement Units - Metric or English - User selectable
Displacement*
Range: 0 to 62.51mm (0-2.46 inches) progammable
Resolution: 0.00254mm (0.0001 inches) programmable
Abs Accuracy: ±0.00762mm (±0.0003 inches) max
Repeatability: ±0.00762mm (±0.0003 inches) max
Force*
Range: 0-3.60kg (0-127oz); other available ranges inc. 0-75.0g
(0-2.65oz), 0-360g (0-12.7oz), 0-2.0kg (0-70.6oz) and 0-20.4kg (0-45.0Ibs)
Resolution: 1g (0.035oz)
Abs Accuracy: ±0.25% of full scale max
Repeatability: ±0.1% of full scale max
Tested Parameters
Actuation:
F = actuation force
F = minimum force
F = travel @ F
T = travel @ F
MAX
MIN
MIN MIN
MAX MAX
RESTORE MIN
RESTORE RESTORE
Release:
F = F @ Release
T = travel @ F
MAX MIN
MAX
Calculation:
F -F
Tactile Ratio =
F
Control Unit
28.6H x 48.9W x 50.8D cm
(11¼H x 19¼W x 20D inches)
16.7kg (37Ibs)
Test Head
25.4H x 10.2W x 8.3D cm
(10H x 4W 3¼D inches)
2.9kg (6.5Ibs)
Software (only)
Tactile Operations® for
Windows™ control and analysis
software package requires an IBM
compatible PC with 80386 or
higher processor, Microsoft
Windows™ 3.1 or later.
* Options available
Force Units kgrams
Distance Units millimeters
FDR Configuration x
General Force Distance Resistance
OK Cancel Validate
Force Units kgrams
Distance Units millimeters
FDR Configuration x
General Distance Resistance
OK Cancel Validate
Name: test
Average Rate: 1.106327 mm/sec
Work Order: 98905
Maximum Force: 3.600
Touch Force: 0.040
Version:
Tester: 921A
Nest Code:
Pres Sensor: -01 (3.600 kg) Steps/Log: 1
Lead Screw: -01 (0.003 mm)
Test Speed: maximum
Tactile Ratio (%): 100 0
Test Tolerances
MinimumMaximum
F max: 3.600
F min: 3.600
F restore: 3.600
F make: 3.600
F break: 3.600
F low: 3.600
0.000
0.000
0.000
0.000
0.000
0.000
Test Tolerances
Force Units kgrams
Distance Units millimeters
FDR Configuration x
General Force Resistance
OK Cancel Validate
Reference Block Size: 0.000
T max: 166.459
T min: 166.459
T restore: 166.459
T make: 166.459
T break: 166.459
T low: 166.459
0.000
0.000
0.000
0.000
0.000
0.000
Test Tolerances
Force Distance
Force Units kgrams
Distance Units millimeters
FDR Configuration x
General Force
OK Cancel Validate
Spec Resistance: 8000
R max: 16380
R min: 16380
R restore: 16380
R make: 16380
R break: 16380
R low: 16380
0
0
0
0
0
0
Test Tolerances
Distance Resistance
Active Channel
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
Active Channel Machine Resistance Type:
Channel 1
Channel 2
16 kohm(.25ma):None
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