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

Max input capacitance to ground: 100 nF

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 + A
Temperature coefficient2,3
±(% rdg/°C + A/°C)
1 nA80 Hz10 Hz0.1% + 5 pA0.5% + 5 fA50 ppm/°C + 0.5 pA/°C
10 nA80 Hz10 Hz0.1% + 5 pA0.5% + 50 fA50 ppm/°C + 0.5 pA/°C
100 nA450 Hz20 Hz0.05% + 10 pA0.1% + 500 fA5 ppm/°C + 0.5 pA/°C
1 µA2.2 kHz100 Hz0.05% + 500 pA0.1% + 5 pA5 ppm/°C + 0.5 pA/°C
10 µA8 kHz500 Hz0.05% + 500 pA 0.05% + 50 pA5 ppm/°C + 5 pA/°C
100 µA40 kHz1 kHz0.05% + 1 nA 0.05% + 500 pA2 ppm/°C + 50 pA/°C
1 mA>100 kHz1 kHz0.05% + 10 nA0.05% + 5 nA2 ppm/°C + 500 pA/°C
10 mA>100 kHz1 kHz0.05% + 100 nA0.05% + 50 nA2 ppm/°C + 5 nA/°C
100 mA>100 kHz1 kHz0.05% + 1 µA0.05% + 500 nA 5 ppm/°C + 50 nA/°C

Noise (typical)

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

DC input impedance

RangeDC input impedance
1 nA5 kΩ
10 nA500 Ω
100 nA50 Ω
1 µA50 Ω
10 µA5 Ω
100 µA1 Ω
1 mA200 mΩ
10 mA200 mΩ
100 mA200 mΩ

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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