Continuity is the connection between the igniter and the cue on the firing module: a cue is the speaker terminal or port in which the igniters connect to the module. Confirming a connection between the igniter and the cue will ensure that your igniter receives the power needed to fire the attached product. The COBRA firing system tests for continuity by sending a small pulse of electricity through the igniter to verify resistance is present. To test this locally on the 18M turn the module into TEST mode and press the test button.
For a continuity check on the COBRA 18M, the firing module sends a 15mA pulse of electricity through the igniter to check continuity. This is a small enough pulse that does not allow the firing module to fire the igniter but still allows a round trip back to the module to verify a complete connection.
To learn how to check continuity on the 18R2, see What is continuity and how do I test it on my module or 18R2?
You can also check continuity on the 18R2 directly. To learn how, see 18R2 Check Continuity.
To learn more about continuity and the maximum number of igniters you can place on each cue, see Continuity Clarified.