Model 3721: Amps Channels Fuse Replacement; Figure 9-9: Schematic Of The Model 3721 In Four-Wire Common Side Ohm Mode - Keithley 3720 User Manual

Series 3700 System Switch/Multimeter User's Manual
The following figure provides a switching schematic for the Model 3721 in four-wire common
side ohm mode.

Figure 9-9: Schematic of the Model 3721 in four-wire common side ohm mode

Model 3721: AMPS channels fuse replacement

Channels 41 and 42 are protected by series fuses. In the event of an overload, both channels
and the DMM input are protected. The two fuses are replaceable and are located on the printed
circuit board of the Model 3721 switch card. The Model 3721 must be removed from the Series
3700 and all power disconnected in order to access these fuses.
Document Number: 3700S-900-01 Rev. A / August 2007
Section 9: Series 3700 Module Schematics and Connections
9-17