5½位6485型皮安表是高性价比小电流测试仪器，测量20fA到20mA的电流，每秒最快1000个读数的速度进行测量。它具有的10fA的分辨率与高灵敏度，特别适合于低电流测试场合，而它20mA的量程使它可以测量较高的电流，如测量4-20mA的传感器电流。6485采用反馈式皮安表，但它仍比类似功能的其它仪表便宜得多，比如光功率计。

产品特点

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       5½位6485型皮安表是高性价比小电流测试仪器，可以测量20fA到20mA的电流，按照每秒最快1000个读数的速度进行测量。它具有的10fA的分辨率与高灵敏度，使它特别适合于低电流测试场合，而它20mA的量程使它可以测量较高的电流，如测量4-20mA的传感器电流。尽管6485使用了最新的电流测量技术，但它仍比类似功能的其它仪表便宜得多，比如光功率计，其它的皮安表或用户自制的系统。

       6485的价格相当于通用的数字表，用它进行皮安级的电流测量，任何实验室或生产车间都可以负担得起。数字表一般使用分流电流表电路来测量电流，而6485采用反馈式皮安表。此设计把输入端压降减少了几个数量级，使在低量程上输入端压降小于200μV。低的输入端压降使6485的功能比数字表更像一个理想的安培计，所以它可以很准确地测量电流，既使是源电压很低的电路。

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/second1

To IEEE-488 bus 900 readings/second1, 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 scientific 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 (31⁄2 in. × 83⁄8 in. × 149⁄16 in.).

Working Dimensions: From front of case to rear including power cord and IEEE-488 connector:

394mm (15.5 inches).

Net Weight: <2.8 kg (<6.1 lbs).

Shipping Weight: <5 kg (<11 lbs).

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

NMRR1: (50 or 60Hz) :60dB

MAXIMUM COMMON MODE VOLTAGE: 42V.

ISOLATION (Meter COMMON to chassis): Typically >5×1011Ω 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.