6-6 Model 2790 SourceMeter® Switch System User’s ManualKeithley 7702 moduleThe 40 two-wire (or 20 four-wire) input channels of the 7702 module make it ideal to testmultiple DUT. With system channel operation, a single channel closure connects a DUT tothe Model 2790 DMM for measurement. Testing multiple DUT can be further automatedusing the scanning feature of the Model 2790. Once configured, the testing process can bestarted with a single press of a button (or when commanded for remote programming).NOTE Details on scanning 7702 channels are provided in Section 7 of the Model 2790Reference Manual.Figure 6-3 shows the simplified test circuit for using the Ω4 function of the Model 2790with the 7702 module to measure low ohm DUT. The DUT is connected to channels 1 and21 of the 7702. When channel 1 is closed using system channel operation, the DUT con-nects to the DMM of the Model 2790.Figure 6-3Using Model 2790 4-wire ohms with 7702 module (low ohms measurements)DMM Ω4Input HIInput LOSense HISense LODUT1Keithley 7702= Channel closed by user (system channel operation).The channels that also close when Ch 1 is closed are notshown. These include the paired input channel (Ch 21) the4-pole relay (Ch 43) and backplane channels (Chs 44 and 45).Keithley 27901
