CM-10 current measure module

This module provides current measurements with near-zero input offset voltage from fA levels up to 100 mA from DC to 100 kHz, including amplitude, phase, and harmonic detection capabilities. The module also has configurable hardware and software filtering.

Current noise performance is on par with modern TIA and DC picoammeters, and the module also includes a programmable ±10 V voltage bias offset feature for materials or devices that require biased current measurements or operation, such as a photodiode.

CM-10 specifications

Specifications subject to change

Ranges: 100 mA, 10 mA, 1 mA, 100 μA, 10 μA, 1 μA, 100 nA, 10 nA, 1 nA; automatic transitions

Input offset voltage2: <50 µV

Leakage current2: Greater of 5 ppm of range, 500 fA

Settable bias voltage: ±10 V

Best sensitivity: <1 fA1

Hardware filters: LP—10 Hz, 30 Hz, 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz (20 dB or 40 dB/decade); HP—10 Hz, 30 Hz, 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz (20 dB or 40 dB/decade); Modes—High reserve, Low-noise

Module field exposure: Operational limit <5 mT DC (typical, normal mode)

Size: 142 mm W × 39 mm H × 89 mm D (5.6 in × 1.5 in × 3.5 in)

Bandwidth (typical)/accuracy

RangeBandwidth (-3 dB)DC2Lock-in2,3Temperature coefficient2,3
100 mA>100 kHz0.1% + 70 µA0.05%8 ppm/°C
10 mA>100 kHz0.055% + 2.5 µA8 ppm/°C
1 mA>100 kHz0.05% + 150 nA8 ppm/°C
100 µA40 kHz0.05% + 15 nA8 ppm/°C
10 µA8 kHz0.05% + 1.5 nA8 ppm/°C
1 µA2.5 kHz0.05% + 500 pA8 ppm/°C
100 nA450 Hz0.05% + 500 pA8 ppm/°C
10 nA90 Hz0.1% + 500 pA0.1%80 ppm/°C
1 nA90 Hz0.1% + 500 pA80 ppm/°C

Noise (typical)

RangeNoise at 1 kHzNoise at 0.1 Hz to 10 Hz
100 mA3.5 nA/√Hz50 nA p-p
10 mA350 pA/√Hz5 nA p-p
1 mA35 pA/√Hz500 pA p-p
100 µA3.5 pA/√Hz50 pA p-p
10 µA700 fA/√Hz10 pA p-p
1 µA70 fA/√Hz1 pA p-p
100 nA20 fA/√Hz200 fA p-p
10 nA6 fA/√Hz150 fA p-p
1 nA6 fA/√Hz100 fA p-p

1 1 nA range, 10 s, 95% confidence interval
2 1 year, ±5 °C from Lake Shore calibration; 24 h, ±1 °C from self‑calibration
3 DC to 1 kHz

CM-10
CM-10 module options

Options for the CM-10 module that you can set on the M81 instrument screen

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