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ii
2.8
Analog outputs .................................................................................................................................................. 2-18
2.8.1
2V analog output ..................................................................................................................................... 2-18
2.8.2
Preamp out .............................................................................................................................................. 2-19
2.9
Using external feedback ................................................................................................................................... 2-21
2.9.1
Electrometer input circuitry .................................................................................................................... 2-21
2.9.2
Shielded fixture construction .................................................................................................................. 2-22
2.9.3
External feedback procedure .................................................................................................................. 2-22
2.9.4
Non-standard coulombs ranges ............................................................................................................... 2-23
2.9.5
Logarithmic currents ............................................................................................................................... 2-23
2.9.6
Non-decade current gains ....................................................................................................................... 2-24
2.10
Using zero correct and baseline suppression .................................................................................................... 2-25
2.10.1
Zero correct and zero check .................................................................................................................... 2-25
2.10.2
Using suppression ................................................................................................................................... 2-25
2.11
Data storage ...................................................................................................................................................... 2-26
2.12
External triggering ............................................................................................................................................ 2-28
2.12.1
External trigger input .............................................................................................................................. 2-28
2.12.2
Meter complete output ............................................................................................................................ 2-29
2.12.3
Triggering example ................................................................................................................................. 2-29
2.13
Measurement considerations ............................................................................................................................ 2-30
2.13.1
Ground loops .......................................................................................................................................... 2-30
2.13.2
EIectrostatic interference ........................................................................................................................ 2-31
2.13.3
Thermal EMFs ........................................................................................................................................ 2-31
2.13.4
Electromagnetic interference (EMI) ........................................................................................................ 2-31
2.13.5
Leakage resistance effects ...................................................................................................................... 2-32
2.13.6
Input capacitance effects ......................................................................................................................... 2-32
2.13.7
Source resistance .................................................................................................................................... 2-33
2.13.8
Source capacitance .................................................................................................................................. 2-34
2.14
Engineering units conversion ........................................................................................................................... 2-34
3
IEEE-488 Programming
3.1
Introduction ......................................................................................................................................................... 3-1
3.2
Device-dependent command programming ........................................................................................................ 3-1
3.2.1
Calibration value (A) ................................................................................................................................ 3-5
3.2.2
Reading mode (B) ..................................................................................................................................... 3-5
3.2.3
Zero check (C) .......................................................................................................................................... 3-6
3.2.4
Function (F) .............................................................................................................................................. 3-6
3.2.5
Data format (G) ......................................................................................................................................... 3-7
3.2.6
EOI and bus hold-off modes (K) .............................................................................................................. 3-8
3.2.7
Non-volatile memory storage (L) ............................................................................................................. 3-9
3.2.8
SRQ mask (M) and status byte format ..................................................................................................... 3-9
3.2.9
Baseline suppression (N) ........................................................................................................................ 3-12
3.2.10
Data store mode (Q) ................................................................................................................................ 3-13
3.2.11
Range (R) ................................................................................................................................................ 3-14
3.2.12
Trigger mode (T) .................................................................................................................................... 3-15
3.2.13
Status (U) ................................................................................................................................................ 3-16
3.2.14
Terminator (Y) ........................................................................................................................................ 3-20
3.2.15
Execute (X) ............................................................................................................................................. 3-20
3.2.16
Zero correct (Z) ....................................................................................................................................... 3-21
3.3
Bus connections ................................................................................................................................................ 3-22
3.4
Primary address ................................................................................................................................................ 3-22
3.5
Talk-only mode ................................................................................................................................................. 3-23
3.6
Front panel messages ........................................................................................................................................ 3-23
Summary of Contents for 6512
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