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: <150 µV

Settable bias voltage: ±10 V

Bias voltage settable resolution: 320 µV

Best sensitivity: <10 fA1

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

Magnetic field exposure: Operational up to 3 mT DC

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

CM-10
CM-10 module options

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

Bandwidth/accuracy

RangeBandwidth (-3 dB, typical)Full accuracyDC2
±(% rdg + A)
Lock-in2,3
±% rdg
Temperature coefficient2,3
±(% rdg/°C + A/°C)
100 mA>100 kHz1 kHz0.05% + 1 µA0.05%5 ppm/°C + 10 nA/°C
10 mA>100 kHz1 kHz0.05% + 100 nA0.05%2 ppm/°C + 5 nA/°C
1 mA>100 kHz1 kHz0.05% + 10 nA0.05% 2 ppm/°C + 20 pA/°C
100 µA40 kHz1 kHz0.05% + 1 nA 0.05% 2 ppm/°C + 1 pA/°C
10 µA8 kHz500 Hz0.05% + 500 pA 0.05%5 ppm/°C + 1 pA/°C
1 µA2.2 kHz100 Hz0.05% + 500 pA0.1%5 ppm/°C + 0.5 pA/°C
100 nA450 Hz20 Hz0.05% + 10 pA0.1%5 ppm/°C + 0.5 pA/°C
10 nA80 Hz10 Hz0.1% + 5 pA0.5%50 ppm/°C + 0.5 pA/°C
1 nA80 Hz10 Hz0.1% + 5 pA0.5%50 ppm/°C + 0.5 pA/°C

Noise (typical)

RangeNoise density4Noise at 0.1 Hz to 10 Hz4
100 mA2.6 nA/√Hz at 1 kHz35 nA RMS (175 nA p-p)
10 mA250 pA/√Hz at 1 kHz4 nA RMS (20 nA p-p)
1 mA30 pA/√Hz at 1 kHz350 pA RMS (1.75 nA p-p)
100 µA3.5 pA/√Hz at 1 kHz30 pA RMS (150 nA p-p)
10 µA500 fA/√Hz at 1 kHz4 pA RMS (20 pA p-p)
1 µA70 fA/√Hz at 1 kHz400 fA RMS (2 pA p-p)
100 nA13 fA/√Hz at 100 Hz60 fA RMS (300 fA p-p)
10 nA4.3 fA/√Hz at 77 Hz16 fA RMS (80 fA p-p)
1 nA4.3 fA/√Hz at 77 Hz16 fA RMS (80 fA p-p)

DC input impedance

RangeDC input impedance
100 mA30 mΩ
10 mA40 mΩ
1 mA100 mΩ
100 µA1 Ω
10 µA6 Ω
1 µA60 Ω
100 nA500 Ω
10 nA5 kΩ
1 nA80 kΩ

1 1 nA range, 10 s, 95% confidence interval
2 Total system accuracy, 1 year and ±5 °C from Lake Shore calibration; 24 h, ±1 °C from self‑calibration, 95% confidence, filters off
3 DC to full accuracy frequency
4 In Low noise mode; High reserve mode will have the noise of the next higher current range

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