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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

Specification

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/dc36 mA (rms) / ±50 mA (dc)
Accuracy of the voltage-to-current conversion (DC)0.08 %
Temperature drift50 ppm/°C
Operating modesACTIVE 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 supply12 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

Applications

Measurements of superconductive samples
Measurements of metals at very low temperatures
Thermometry
I-V curves
Hall effect

Downloads

AppNote Elimination of common mode errors in low-level resistance measurements
AppNote Elimination of common mode errors in low-level resistance measurements
AMS220 Voltage controlled current source
AMS220 Voltage controlled current source

Contact

Dr. Marc Kunzmann
Dr. Marc Kunzmann

Contact

Quantum Design GmbH

Im Tiefen See 58
64293 Darmstadt
Germany

Phone:+49 6151 8806-0
Fax:+49 6151 8806920
E-mail:germany@qd-europe.com
Marc KunzmannProduct Manager - Cryogenics & Materials science
+49 6151 8806-46
kunzmann@qd-europe.com