A-2 Specifications Model 6485 Picoammeter Instruction Manual
GENERAL
INPUT CONNECTOR: BNC on rear panel.
DISPLAY: 12 character vacuum fluorescent.
RANGING: Automatic or manual.
OVERRANGE INDICATION: Display reads “OVRFLOW”.
CONVERSION TIME: Selectable 0.01 PLC to 60 PLC (50PLC under 50Hz operation). (Adjustable
from 200µs to 1s)
READING RATE:
To internal buffer 1000 readings/second
1
To IEEE-488 bus 900 readings/second
1, 2
Notes:
1
0.01 PLC, digital filters off, front panel off, auto zero off.
2
Binary transfer mode.
IEEE-488.1.
BUFFER: Stores up to 2500 readings.
PROGRAMS: Provide front panel access to IEEE address, choice of engineering units or scien-
tific notation, and digital calibration.
EMC: Conforms with European Union Directive 89/336/EEC, EN61326-1.
SAFETY: Conforms with European Union Directive 73/23/EEC, EN61010-1.
TRIGGER LINE: Available, see manual for usage.
DIGITAL FILTER: Median and averaging (selectable from 2 to 100 readings).
ENVIRONMENT:
Operating: 0°–50°C; relative humidity 70% non-condensing, up to 35°C. Above 35°C, derate
humidity by 3% for each °C.
Storage: –25° to +65°C.
WARM-UP: 1 hour to rated accuracy (see manual for recommended procedure).
POWER: 100–120V or 220–240V, 50–60Hz, 30VA.
PHYSICAL:
Case Dimensions: 90mm high × 214mm wide × 369mm deep (3
1
⁄
2
in. × 8
3
⁄
8
in. × 14
9
⁄
16
in.).
Working Dimensions: From front of case to rear including power cord and IEEE-488 connec-
tor: 394mm (15.5 inches).
Net Weight: <2.8 kg (<6.1 lbs).
Shipping Weight: <5 kg (<11 lbs).
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, Output
Format, 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.
6485 Picoammeter Specifications
5¹⁄₂ DIGIT ACCURACY (1YR)
1
DEFAULT ±(% RDG. + OFFSET) TYPICAL ANALOG RISE TIME
3
RANGE RESOLUTION 18°–28°C, 0–70% RH RMS NOISE
2
(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
2 mA 10 nA 0.1 % + 100 nA 10 nA 500 µs
20 mA 100 nA 0.1 % + 1 µA 100 nA 500 µs
TEMPERATURE COEFFICIENT: 0°–18°C & 28°–50°C. For each °C, add
0.1 ∞ (% rdg + offset) to accuracy spec.
INPUT VOLTAGE BURDEN: <200µV on all ranges except <1mV on
20mA range.
MAXIMUM INPUT CAPACITANCE: Stable to 10nF on all nA ranges
and 2µA range; 1µF on 20µA and 200µA ranges, and on mA ranges.
MAXIMUM CONTINUOUS INPUT VOLTAGE: 220VDC
NMRR
1
: (50 or 60Hz) :60dB
MAXIMUM COMMON MODE VOLTAGE: 42V.
ISOLATION (Meter COMMON to chassis): Typically >5∞10
11
Ω in
parallel with <1nF.
ANALOG OUTPUT: Scaled voltage output (inverting 2V full scale on all
ranges) 3% ±2mV, 1kΩ impedance.
1
At 1 PLC – limited to 60 rdgs/sec under this condition.
2
At 6 PLC, 1 standard deviation, 100 readings, filter off, capped input –
limited to 10 rdgs/sec under this condition.
3
Measured at analog output with resistive load >100kΩ.
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