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Voltage controlled current source

AMS 220 from Anmesys

The AMS220 is a voltage controlled current source with active common mode rejection mode. Common mode voltage signals can result in a large error when using a standard measurement set-up for low resistance measurements or when the contact resistances have a large variation. The AMS220 is designed to overcome this unwanted behavior. It is a unique instrument and uses a patented technique.

Features

Optimized for use with lock-in amplifier
AC and DC electric measurements
Low noise due to being completely analog
Replacement of AC resistance bridges in a set-up with lock-in amplifier
Can be used with preamplifier AMS540 and AMS560

Specifications

Voltage-to-current conversion ranges	0.001, 0.01, 0.1, 1 and 10 [mA/V]
Control voltage (VREF) input range (ac/dc)	0 ÷ 3.6 V (rms) / -5 V ÷ +5 V (dc)
Input resistance of the control voltage input	100 kΩ
Maximum output current ac/dc	36 mA (rms) / ±50 mA (dc)
Accuracy of the voltage-to-current conversion (DC)	0.08 %
Temperature drift	50 ppm/°C
Operating modes	ACTIVE CMR / ENABLED (active common mode voltage rejection is activated) ACTIVE CMR / DISABLED (current output IB is grounded)
Targeted frequency range for ACTIVE CMR / DISABLED operation mode	DC - 20 kHz (DC - 2 kHz for 1 μA/V range)
Targeted frequency range for ACTIVE CMR / ENABLED operation mode	DC-200 Hz
Operating voltage swing on the current output IA against the reference ground (typ.)	up to ±[6.5 V - \|VREF/2\|] (± 0.3 V)
Operating voltage swing on the current output IB against the reference ground (typ.)	up to ±6.6 V (± 0.3 V)
Operating range of voltage differences on the current outputs IA, IB (typ.)	up to ±13.4 V
Maximum voltage at the current outputs (against the reference ground)	±10 V
Maximum voltage difference on the current outputs	±20 V
Power supply	12 V (ac) / 50-60 Hz
Maximum power input	7 W
Dimensions (W x H x L)	158 mm x 120 mm x 230 mm
Weight	2.3 kg