5½位6485型皮安表是高性價比小電流測試儀器，可以測量20fA到20mA的電流，按照每秒1000個讀數(shù)的速度進行測量。它具有的10fA的分辨率與高靈敏度，使它特別適合于低電流測試場合，而它20mA的量程使它可以測量較高的電流，如測量4-20mA的傳感器電流。盡管6485使用了的電流測量技術(shù)，但它仍比類似功能的其它儀表便宜得多，比如光功率計，其它的皮安表或用戶自制的系統(tǒng)。
| RANGE | 5¹⁄₂ DIGIT DEFAULT RESOLUTION | ACCURACY (1YR) ±(% RDG. + OFFSET) 18°–28°C, 0–70% RH | TYPICAL RMS NOISE | ANALOG RISE TIME (10% to 90%) |
| 2 nA | 10 fA | 0.4 % + 400 fA | 20 fA | 8 ms |
| 20 nA | 100 fA | 0.4 % + 1 pA | 100 fA | 8 ms |
| 200 nA | 1 pA | 0.2 % + 10 pA | 1 pA | 500 μs |
| 2 μA | 10 pA | 0.15% + 100 pA | 10 pA | 500 μs |
| 20 μA | 100 pA | 0.1 % + 1 nA | 100 pA | 500 μs |
| 200 μA | 1 nA | 0.1 % + 10 nA | 1 nA | 500 μs |
| 2mA | 10 nA | 0.1 % + 100 nA | 10 nA | 500 μs |
| 20mA | 100 nA | 0.1 % + 1 μA | 100 nA | 500 μs |
此儀器在IEEE-488接口通訊應(yīng)用中的規(guī)格說明
IEEE-488 BUS IMPLEMENTATION
MULTILINE COMMANDS:DCL, LLO, SDC, GET, GTL, UNT, UNL, SPE,SPD.
IMPLEMENTATION: SCPI (IEEE-488.2, SCPI-1996.0); DDC (IEEE-488.1).
UNILINE COMMANDS: IFC, REN, EOI, SRQ, ATN.
INTERFACE FUNCTIONS: SH1, AH1, T5, TE0, L4, LE0, SR1, RL1, PP0,DC1, DT1, C0, E1.
PROGRAMMABLE PARAMETERS: Range,Zero Check,Zero Correct,EOI(DDC mode only),Trigger,Terminator(DDC mode only),Calibration (SCPI mode only), Display Format, SRQ, REL, OutputFormat, V-offset Cal.
ADDRESS MODES: TALK ONLY and ADDRESSABLE.
LANGUAGE EMULATION: Keithley Model 485 emulation via DDC mode.
RS-232 IMPLEMENTATION:
Supports: SCPI 1996.0.
Baud Rates: 300, 600, 1200, 2400, 4800, 9600, 19.2k, 38.4k, 57.6k.
Protocols: Xon/Xoff, 7 or 8 bit ASCII, parity-odd/even/none.
Connector: DB-9 TXD/RXD/GND.
