![background image](http://html1.mh-extra.com/html/keithley/6512/6512_instruction-manual_4063439013.webp)
vii
2
Operation
Figure 2-1
Model 6512 front panel ............................................................................................................................... 2-3
Figure 2-2
Model 6512 rear panel ................................................................................................................................ 2-7
Figure 2-3
Input connector configuration ..................................................................................................................... 2-9
Figure 2-4
Connections for voltage measurements .................................................................................................... 2-10
Figure 2-5
Meter loading considerations ..................................................................................................................... 2-10
Figure 2-6
Unguarded circuit....................................................................................................................................... 2-11
Figure 2-7
Guarded circuit........................................................................................................................................... 2-11
Figure 2-8
Guarded input connections ........................................................................................................................ 2-12
Figure 2-9
Current measurements................................................................................................................................ 2-13
Figure 2-10
Voltage burden considerations................................................................................................................... 2-14
Figure 2-11
Coulombs connections ............................................................................................................................... 2-15
Figure 2-12
Resistance measurement connections ........................................................................................................ 2-17
Figure 2-13
Typical 2V analog output connections....................................................................................................... 2-19
Figure 2-14
Typical preamp out connections ................................................................................................................ 2-20
Figure 2-15
Electrometer input circuitry (external feedback mode) ............................................................................. 2-21
Figure 2-16
Shielded fixture construction ..................................................................................................................... 2-22
Figure 2-17
“Transdiode” logarithmic current configuration........................................................................................ 2-24
Figure 2-18
Non-decade current gains........................................................................................................................... 2-24
Figure 2-19
Equivalent input impedance with zero check enabled ............................................................................... 2-25
Figure 2-20
External trigger pulse specifications .......................................................................................................... 2-28
Figure 2-21
Meter complete pulse specifications .......................................................................................................... 2-29
Figure 2-22
External triggering example....................................................................................................................... 2-30
Figure 2-23
Multiple ground points create a ground loop ............................................................................................. 2-30
Figure 2-24
Eliminating ground loops........................................................................................................................... 2-30
Figure 2-25
Leakage resistance effects.......................................................................................................................... 2-32
Figure 2-26
Input capacitance effects ............................................................................................................................ 2-32
Figure 2-27
Simplified model for source resistance and source capacitance ................................................................ 2-33
3
IEEE-488 Programming
Figure 3-1
General data format...................................................................................................................................... 3-7
Figure 3-2
SRQ mask and status byte format .............................................................................................................. 3-10
Figure 3-3
U0 status word and default values ............................................................................................................. 3-17
Figure 3-4
U1 status (error condition) format.............................................................................................................. 3-18
Figure 3-5
U2 status (data condition) format............................................................................................................... 3-19
Figure 3-6
IEEE-488 connector ................................................................................................................................... 3-22
Figure 3-7
IEEE-488 connections................................................................................................................................ 3-22
Figure 3-8
Model 6512 rear panel IEEE-488 connector.............................................................................................. 3-22
List of Illustrations
Summary of Contents for 6512
Page 119: ...Maintenance 7 10 Figure 7 5 Exploded view...
Page 131: ......