NI Digital Multimeters Getting Started Guide 24 ni.comThe banana plug connectors are high-voltage, safety signal connectors. The 9-pin connector labeledAUX I/O is a digital signal connector, which carries TTL-level triggering signals for use with externalscanning equipment. Refer to the NI Digital Multimeters Help, located at Start»All Programs»National Instruments»NI-DMM»Documentation»NI Digital Multimeters Help, for informationabout scanning.Note The AUX I/O connector is not isolated. It is not referenced to your measurement circuit. Theconnector is referenced to the ground of your computer. The digital signals on this connector shouldnot operate beyond –0.5 to 5.5 V of your computer ground. The trigger signals are TTL-compatible.PCMCIACaution To measure current with the NI PCMCIA-4050, you must use a current shunt module.Refer to the 8. Connecting Signals section of this document for more information.An accessory cable connects the NI PCMCIA-4050 to a pair of test probes equipped with shroudedbanana plugs. Both the accessory cable and the test probes ship with the NI PCMCIA-4050. Theaccessory cable connector is polarized and cannot be plugged in incorrectly.Refer to Figure 21 to connect the accessory cable to the NI PCMCIA-4050.Figure 21. Connecting Cables and Probes to the NI PCMCIA-40501 Laptop Computer2 PCMCIA Slot3 Test Probes4 Accessory Cable5 NI PCMCIA-40502 3541