2-6 Model 2790 SourceMeter
®
Switch System User’s Manual
J108 (I/V converter)
The user also has access to the input, output, and ground of the I/V converter at J108.
Safety warnings
WARNING Integrated safety features protect the 7751/7752/7753 module from its
built-in I-source and V-source. However, if an external source (such as
the 12V car bus) is connected to the front panel inputs of the Model 2790
or 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 to
the inflator and ignite it. Damage to the 7751/7752/7753 module may
also occur if an external source is connected to it.
WARNING Since the Model 2790 system is not an intrinsically safe device, it is the
responsibility 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 levels
I-source and V-source (7751/7753) output levels are set from the CONFIG item of the
CARD menu. The menu structure, shown in Figure 2-2, is accessed by pressing and
releasing 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 to
50µA or 7753 output current to 500µA to achieve rated accuracy. Typical short
circuit current is <1mA.
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