For diagrams and images, please download the PDF document.


Use the check weights supplied with ElmaTear for a quick and easy way to verify if the instrument is performing correctly between calibrations. Checks should be performed if:

·    Questionable results are seen

·    The instrument appears to be performing incorrectly

·    Increased validity for specific testing is needed


ElmaTear is supplied with a set of six (or seven) check weights, one for each corresponding pendulum: ¼A, ½A, A, B, C and D (and E*).


These enable the operator to confirm that the instrument is functioning correctly, but does not replace a calibration performed by a James Heal Service & Calibration Engineer.


This method provides one check point approximately mid-range of each pendulum.


Do not use check weights when verifying the pendulum (free swing test).

·     Check the instrument is level

·     Select a standard to measure in Newtons / single ply

·     Close both jaws WITHOUT a specimen

·     Fit the pendulum weight of choice

·     Verify the pendulum

·     Return the arm to test position

·     Add the corresponding check weight


Once the check weight is in place:

·    ‘Notch’ the ‘specimen’ (no specimen)

·    Release the pendulum arm by pressing both buttons simultaneously

·    Repeat the test 5 times to create a mean

·    The mean should fall between the 2 corresponding figures in the table below


Check Weights – Acceptable Parameters


Check
Weight
Target Force (N)
Minimum Reading (N)
Maximum Reading (N)

¼A

1

0.989

1.034

½A

2

1.978

2.068

A

4

3.956

4.135

B

8

7.91

8.27

C

16

15.82

16.54

D

32

31.65

33.08

E*

64

63.3

66.16

* Optional


If the reading is unsatisfactory, carry out checks as below, then repeat the testing of the performance of the instrument after adjustments have been made:

·    Levelling

·    Tightness of the locking nuts

·    Tightness of knurled handwheel to prevent the weight from rotating

·    Jaws are empty and closed

·    Movement of the instrument – if it moves, fix to a bench


If there continues to be a problem, contact James Heal Service & Calibration.