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Electron Plus

SPA100 Source Picoammeter

Source-picoammeter for measuring and logging small currents down to the pA range, with fA resolution.

  • Current range
    ±2 mA to ±200 pA
  • Output voltage
    0 to ±40 V
  • Resistance
    ~1 kΩ to 40 TΩ
  • Sample rate
    2 / 10 / 20 Hz
US$299.00
US: More stock soonUK: More stock soon
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Overview

The SPA100 is designed for measuring and logging very small currents down to the picoampere range - for scientific and research applications including physics, materials science, and electron microscopy. Measures currents from ±2 mA to ±200 pA across 8 ranges, and functions as an ultra-high-resistance meter into the teraohm (1 × 10¹² Ω).

Connects via USB to PC and runs with the free EPIC software. Bias-voltage sourcing capability (0 to ±40 V, polarity-selectable) supports device characterisation and testing. Notable for sensitivity and stability in low-current measurement applications.

Ideal for

Materials science, semiconductor testing, photodiode characterization, electron microscopy, high-resistance measurements, diode leakage testing, and research applications requiring ultra-sensitive current measurement.

Key features

  • Eight current ranges: ±200 pA to ±2 mA
  • Integrated voltage source: −40 V to +40 V
  • Ultra-high resistance measurement to 40 TΩ
  • 18-bit resolution at 2 Hz sample rate
  • USB-powered with opto-isolated front-end
  • Real-time graphing and CSV data logging
  • Compact, benchtop design

Applications

Semiconductor characterization

Measure diode leakage, MOSFET gate leakage, photodiode dark current, and junction characteristics with sub-picoampere resolution.

Materials science

Characterize insulation resistance, surface conductivity, ionic conductivity, and electrostatic properties of advanced materials.

Electron microscopy

Measure beam current, specimen current, and detector signals with excellent noise performance and proper grounding isolation.

High-resistance testing

Measure cable insulation, PCB leakage, connector resistance, and ultra-high-value resistors up to 40 TΩ accurately.

Full specifications

Current input
±2 mA range
±0.1% accuracy, < 20 nA resolution (at 2 Hz)
±200 µA range
±0.1% accuracy, < 2 nA resolution (at 2 Hz)
±20 µA range
±0.2% accuracy, < 200 pA resolution (at 2 Hz)
±2 µA range
±0.2% accuracy, < 20 pA resolution (at 2 Hz)
±200 nA range
±0.5% accuracy, < 2 pA resolution (at 2 Hz)
±20 nA range
±0.5% accuracy, < 200 fA resolution (at 2 Hz)
±2 nA range
±1.0% accuracy, < 20 fA resolution (at 2 Hz)
±200 pA range
±1.5% accuracy, < 2 fA resolution (at 2 Hz)
Sampling
Rate
2 Hz (18-bit), 10 Hz (16-bit) or 20 Hz (14-bit)
Output
Voltage
0 to ±40 V (1 V increments, polarity-selectable), 2.7 kΩ output resistance
Power
Input
USB Type B, bus-powered, ≤ 0.5 A
Compliance
Certification
CE & UKCA
Dimensions
Dimensions
112 mm (W) x 36 mm (H) x 107 mm (D)
Weight (net)
0.267 kg
Ordering
SKU
SPA100
EAN
5065020202044
HS code
9030.20.1000

Scope of supply

2 items
ItemPart no.Qty
SPA100 Source PicoammeterSPA1001
1.8 m USB cableMISC133B1

Software

2 files
TitleVersionOSLangReleasedSizeFormat
EPIC Software (V26.601, 64-bit)V26.601WindowsEN-104 MBZIP
Python example code2026-03-02Cross-platformEN-19 KBZIP

Documents

2 files
TitleVersionTypeLangReleasedSizeFormat
DatasheetDS_SPA100_V2600DatasheetENJul 2026-PDF
User Manual (V26.006)V26.006ManualEN-177 KBPDF

Ready to measure down to femtoamps?

Ships calibrated with free software, drivers and lifetime updates.

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