2-6 Model 2790 SourceMeter® Switch System User’s ManualJ108 (I/V converter)The user also has access to the input, output, and ground of the I/V converter at J108.Safety warningsWARNING Integrated safety features protect the 7751/7752/7753 module from itsbuilt-in I-source and V-source. However, if an external source (such asthe 12V car bus) is connected to the front panel inputs of the Model 2790or through a 7702 module, these safety features are compromised, creat-ing the very real possibility of igniting the airbag. Incorrect channel clo-sures in the test system could inadvertently apply the external source tothe inflator and ignite it. Damage to the 7751/7752/7753 module mayalso occur if an external source is connected to it.WARNING Since the Model 2790 system is not an intrinsically safe device, it is theresponsibility of the user to ensure that external protection be pro-vided, either by an inherently safe electrical barrier and/or a safety bar-rier around the DUT or airbag, to prevent injury in case of detonation.Setting source output levelsI-source and V-source (7751/7753) output levels are set from the CONFIG item of theCARD menu. The menu structure, shown in Figure 2-2, is accessed by pressing andreleasing SHIFT and then pressing CARD.• I-source — Set output from 0 to 50mA. In the menu structure, the I-source is desig-nated as channel 27. The default setting is 1mA.• V-source (7751/7753 only) — Set output from 50 to 500V. In the menu structure,the V-source is designated as channel 28. The default setting is 50V.NOTE When using the V-source as an independent source, limit 7751 output current to50μA or 7753 output current to 500μA to achieve rated accuracy. Typical shortcircuit current is <1mA.
