486 Picoammeter
487 Picoammeter/ Voltage Source
486:
• 10fA sensitivity
• 180 readings per second
• IEEE-488 interface
487:
• Resistivity measurements
(<1Ω to >10
• ± 500V source
• 10fA sensitivity
• 180 readings per second
• IEEE-488 interface
16
Ω)
Designed for low current applications that require fast readings
Ordering Information
486 Picoammeter
487 Picoammeter/Voltage
Source
These products are available
with an Extended Warranty.
Accessories Supplied
237-ALG-2 Low Noise Triax
Cable, 3-Slot Triax to Alligator
Clips, 2m (6.6 ft)
Model 487 also comes with 236ILC-3 Interlock Cable, 3m (10 ft)
486 Picoammeter
The Model 486 is a 5
reading rates must be made. It offers a speed of 180 readings per second.
The 486 is ideal for low-level DC current applications, such as:
• PMT current measurements
• mass spectrometer current measurements
• probe current measurements in electrochemistry
•plasma generated currents
• ion chamber currents
Operation is fast and convenient. Selectable analog and digital filters provide optimum wide-band performance with minimum noise. Autoranging selects the most appropriate range within 100ms. The measurement buffer holds up to 512 readings for fast data acquisition. Any reading within the buffer may be
displayed, or the entire buffer may be searched for the maximum and minimum values.
Other important features include REL, which allows measurements to be made relative to a selectable
baseline. ZERO CHECK and CORRECT functions correct for voltage offset errors using front panel or software commands.
The IEEE-488 interface provides simple integration and convenient user interaction. Digital calibration can
be accomplished over the bus or completely from the front panel. The display features three selectable
intensities (bright, dim, and off) for use in light-sensitive environments.
487 Picoammeter/Voltage Source
The Model 487 is designed for measurement of low currents and very high resistances. This instrument
incorporates all the capabilities of the 486, and adds a programmable ±500V source. This combination of
picoammeter and voltage source provides a powerful high resistance meter and fast picoammeter in one
instrument.
The 487 makes current measurements from 10fA to 2mA. Two voltage source ranges are available: a 500V
range with 10mV resolution and a 50V range with 1mV resolution. A PRESET button allows the user to
toggle between two separate source values.
The 487 sources up to 500V, measures the current with 10fA sensitivity, and then instantly calculates the
resistance value, from 500mΩ to 5 × 10
vals from 10ms to 1000s can be programmed, simplifying tests that require a predetermined “soak” time.
Two displays, one for current readings and one for voltage sourcing, permit the voltage setting and the
measured current to be viewed throughout the measurement.
The Model 487 and the 6517A are the most effective test instruments for performing such tasks as resistivity, I-V measurements, component leakage, and insulation resistance. A common test procedure, written by the American Society of Testing and Materials, D257: D-C RESISTANCE OR CONDUCTANCE OF
INSULATING MATERIALS, is easily performed with the 487 or the 6517A.
1
⁄2-digit autoranging picoammeter designed for low current applications where fast
16
Ω. The unit displays either current or resistance. Reading inter-
1.888.KEITHLEY (U.S. only)
LOW I/HIGH R PRODUCTS
www.keithley.com
A GREATER MEASURE OF CONFIDENCE
486 Picoammeter
487 Picoammeter/ Voltage Source
AMMETER ANALOG OUTPUT
ACCURACY (1 Year)* Rise Time (10%–90%)
RANGE RESOLUTION ±(%rdg+offset) OFF ON
2nA 10fA 0.3 + 500 fA 12 ms 70 ms
20 nA 100 fA 0.2 + 3 pA 4 ms 17 ms
200 nA 1 pA 0.15 + 20 pA 800 µs 4 ms
2µA10pA 0.15 + 200 pA 380 µs 2 ms
20 µA 100 pA 0.1 + 2 nA 160 µs 370 µs
200 µA 1 nA 0.1 + 20 nA 160 µs 370 µs
2mA 10nA 0.1 + 200 nA 160 µs 370 µs
* When properly zeroed.
MAXIMUM OVERLOAD: 350V peak on nA ranges and 2µA range; 50V peak on 20µA, 200µA, and 2mA ranges.
Higher voltage sources must be current limited at 3mA.
INPUT VOLTAGE BURDEN: <200µV (18°–28°C) for inputs <100µA; <2mV for inputs ≥ 100µA; 20µV/°C tempera-
ture coefficient.
TEMPERATURE COEFFICIENT (0°–18°C & 28°–50°C): ±(0.15 ×applicable accuracy specification)/ °C.
NMRR: >60dB at 50Hz (LINE 50Hz integration) or 60Hz (LINE 60Hz integration).
ANALOG OUTPUT:
Range: ±2V for full range input (non-inverting).
Accuracy: ±(2.5% + 3mV); resistive loads >2kΩ; 18°–28°C.
Impedance: <100Ω, DC–2kHz.
RANGING: Automatic or manual.
AUTORANGING TIME: <200ms to final range (analog filter OFF).
MAXIMUM READING RATES (readings/second):
INTEGRATION CONTINUOUS INTO INTO IEEE-488
SETTING RESOLUTION DATA STORE DATA STORE BUS**
FAST 41⁄2-Digit 100 180 16
LINE 60Hz 5
LINE 50Hz 51⁄2-Digit 33 38 12
** One-shot on TALK, G7 data format.
1
⁄2-Digit 40 44 14
18°–28°C Analog Filter
EXTERNAL TRIGGERED VIA
VOLTAGE SOURCE (487 only):
RANGE STEP (1 Year) NOISE COEFFICIENT
(maximum SIZE 18°–28°C (p-p)*** 0°–18°C &
value) (typical) ±(%setting+offset) 0.1–10Hz 28°–50°C
±505.00 V 10 mV 0.15 + 40 mV <1.5 mV 80 ppm + 2 mV/°C
±50.500 V 1 mV 0.1 + 4 mV <150 µV 50 ppm + 200µV/°C
*** With LO terminal connected to chassis.
SELECTABLE CURRENT LIMIT: 2.5mA ±0.5mA or 25µA ±5µA.
WIDEBAND NOISE: <30mV p-p 0.1Hz to 20MHz.
TIME STABILITY: ±(0.003% + 1mV) over 24 hours at constant temperature.
OUTPUT RESISTANCE: <2.5Ω.
ACCURACY TEMPERATURE
V/I OHMS (487 only)
Used with voltage source; resistance calculated from voltage setting and measured current. V/I OHMS accuracy
equals voltage source accuracy plus ammeter accuracy. Typical accuracy better than 0.6% for readings between 1kΩ
and 1TΩ.
IEEE-488 BUS IMPLEMENTATION
PROGRAMMABLE PARAMETERS: All parameters programmable except for
IEEE-488 bus address and frequency for line integration.
TRIGGER TO FIRST BYTE: <50ms (trigger on TALK, ATN false to talker DAV
true, G7 data format).
GENERAL
DATA STORE and MIN/MAX: Stores up to 512 readings and identifies minimum
and maximum reading.
PROGRAMMABLE READING INTERVAL: 10ms to 999.999s in 1ms increments.
TRIGGER: One-shot or continuous from front panel, IEEE-488 bus, and rear
panel BNC.
PROGRAMMABLE TRIGGER DELAY: 1ms to 999.999s in 1ms increments.
DISPLAY: One ten character plus one eight character alphanumeric LED displays
with normal/dim/off intensity control.
MAXIMUM VOLTAGE BETWEEN VOLTAGE SOURCE AND CURRENT METER:
500V DC.
MAXIMUM VOLTAGE BETWEEN CHASSIS AND VOLTAGE SOURCE OR CUR-
RENT METER: 500V DC.
REAR PANEL CONNECTORS:
Input Connector: 3-lug triax.
Analog Output: 5-way binding post.
External Trigger and Meter Complete: BNC connectors.
IEEE-488 Connector: Chassis grounded.
Voltage Source Output (487 only): 5-way binding post.
Interlock Connector (487 only): 3-pin miniature DIN.
EMC: Conforms to European Union Directive 89/336/EEC.
SAFETY: Conforms to European Union Directive 73/23/EEC (meets EN61010-
1/IEC 1010).
ENVIRONMENT: Operating: 0°–50°C, <70% RH up to 35°C; linearly derate 3%
RH/°C, up to 50°C. Storage: –25° to 60°C.
WARM-UP: 2 hours to rated accuracy.
POWER: 105–125V AC or 210–250V AC (external switch selectable), 90–110V
and 180–220V AC version available. 50Hz or 60Hz, 45VA maximum.
DIMENSIONS: 90mm high × 213mm wide × 397mm deep (3
5
⁄8 in).
15
1
⁄
2 in × 8
3
⁄
8 in ×
ACCESSORIES AVAILABLE
CABLES
236-ILC-3 Safety Interlock Cable
237-ALG-2 Low Noise Cable
7078-TRX-3 3-Slot Male Triax to 3-Slot Male Triax Cable, 0.9m (3 ft)
ADAPTERS
6171 3-Slot Male Triax to 2-Lug Female Triax
6172 2-Slot Male Triax to 3-Lug Female Triax
7078-TRX-BNC
TEST FIXTURE
8008 Resistivity Chamber
RACK MOUNTS
4288-1 Single Fixed Rack Mount Kit
4288-2 Dual Fixed Rack Mount Kit
4288-4 Dual Fixed Rack Mount Kit
3-Slot Male Triax to BNC Adapter
Model 486 and 487 Specifications
486 Rear Panel 487 Rear Panel
1.888.KEITHLEY (U.S. only)
www.keithley.com
A GREATER MEASURE OF CONFIDENCE
LOW I/HIGH R PRODUCTS
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