Keithley 6221 User Manual

9 Limit Test and Digital I/O
Figure 9-1 Limit 1 test (compliance) .................................................................................... 9-2
Figure 9-2 Digital I/O port ................................................................................................... 9-5
Figure 9-3 Digital I/O port simplified schematic ................................................................. 9-6
Figure 9-4 Controlling externally powered relays ................................................................ 9-7
Figure 9-5 NAND gate control ............................................................................................. 9-8
10 Remote Operations
Figure 10-1 IEEE-488 connector ........................................................................................ 10-19
Figure 10-2 Multi-unit connections .................................................................................... 10-20
Figure 10-3 IEEE-488, Ethernet (6221 only), and RS-232 connector locations ................ 10-21
Figure 10-4 RS-232 interface connector ............................................................................ 10-27
Figure 10-5 Direct 6221 connection to PC ......................................................................... 10-29
Figure 10-6 Small LAN system using a hub ...................................................................... 10-30
Figure 10-7 Isolated LAN system using two NICs (Network Interface Cards) ................ 10-30
Figure 10-8 Enterprise-wide or internet network system ................................................... 10-31
Figure 10-9 RJ-45 Ethernet cable (male/male) .................................................................. 10-31
Figure 10-10 Model 6221 Ethernet connector ...................................................................... 10-32
Figure 10-11 Example software typical main screen ........................................................... 10-36
Figure 10-12 Typical instrument connection setup wizard .................................................. 10-37
Figure 10-13 Typical virtual front panel ............................................................................... 10-38
11 Status Structure
Figure 11-1 Model 622x status mode structure .................................................................... 11-3
Figure 11-2 16-bit status register .......................................................................................... 11-5
Figure 11-3 Status byte and service request ......................................................................... 11-7
Figure 11-4 Standard event status ....................................................................................... 11-12
Figure 11-5 Operation event status ..................................................................................... 11-14
Figure 11-6 Measurement event status ............................................................................... 11-16
Figure 11-7 Questionable event status ................................................................................ 11-17
13 DISPlay, FORMat, and SYSTem Key-Press Codes
Figure 13-1 ASCII data format ............................................................................................. 13-5
Figure 13-2 IEEE-754 data formats ..................................................................................... 13-6
Figure 13-3 Model 6220 key-press codes ........................................................................... 13-10
Figure 13-4 Model 6221 key-press codes ........................................................................... 13-11
16 Performance Verification
Figure 16-1 Connections for DC current output accuracy (200nA to 100mA ranges) ........ 16-6
Figure 16-2 Connections for DC current output accuracy (2nA and 20nA ranges) ............. 16-7
Figure 16-3 Connections for compliance accuracy .............................................................. 16-8
Figure 16-4 Connections for waveform function amplitude flatness ................................... 16-9
Figure 16-5 Connections for waveform function frequency accuracy ............................... 16-10
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Keithley 6221 Specifications

General

Interface	GPIB, RS-232
Communication Interface	GPIB, RS-232
Current Sourcing Accuracy	±(0.03% of output + 20 pA)
Current Sinking Accuracy	±(0.03% of output + 20 pA)
Output Resolution	100 fA
Output Accuracy	±(0.03% of output + 20 pA)
Power Requirements	100 V to 240 V AC, 50/60 Hz