Model 420 Detailed Specifications @ 25 °C
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Magnet Current Control Parameters

Standard Model 420 Configurations: Programmable Limits

± 10 A ± 100 A ± 200 A ± 300 A
Measurement Resolution: 20 µA 0.2 mA 0.4 mA 0.6 mA
Accuracy ( % of Imax ): 0.1% 0.1% 0.1% 0.1%
Minimum Ramp Rate: 20 µA/min 0.1 mA/min 0.1 mA/min 0.1 mA/min
Maximum Ramp Rate: 1 A/sec 10 A/sec 20 A/sec 30 A/sec

Additional Specifications for all Configurations

Magnet Current Control
Temperature Coefficient: 0.01% of Imax / °C
Stability: Better than 0.01% (40 minute warm-up)
Programming Resolution: 15 digitsa
Ramp Rate Resolution: 15 digits
Nominal Load Inductance Range: 0.5 to 100 Henries
Program Out Voltage
Programmable Limits: -10 to +10 VDC (voltage-voltage mode)
Accuracy: 0.1% of Vmax
Temperature Coefficient: 0.005% of Vmax / °C
Resolution: 20 µV
Stability: < 35 mV P-P when paused or holding
Magnet Voltage Measurement
Maximum Limits: -20 to +20 VDC
Accuracy: 0.1% of Vmax
Temperature Coefficient: 0.01% of Vmax / °C
Resolution: 10 mV
Persistent Switch Heater Output
Programmable Limits: 0.1 to 100 mA DC
Accuracy: 0.5 mA
Temperature Coefficient: 0.02 mA / °C
Maximum Compliance: 13.5 V
Resolution: 0.1 mA
Optional External Supply Limits: 10 VA, 0.5 A max, 100 VDC max
Power Requirements
Primary: 100-120 or 200-240 VAC ±10%
50-60 Hz, 50 VA max
Memory Backup Battery: 3.6 Volt AA Lithium Cell
Physical
Dimensions: 88 mm H x 483 mm W x 191 mm D
(3.5" H x 19" W x 10.75" D)
Weight: 4.2 kg (9.2 lbs).
Torque Limits on Current Shunt Terminals: 5, 10, and 100 A models: 50 in-lbs.
200 A model: 150 in-lbs.
300 A model: 360 in-lbs.
Environmental
Ambient Temperature: Operating: 0 °C to 50 °C (32 °F to 122 °F)
Non-operating: -20 °C to 60 °C (-4 °F to 140 °F)
Relative Humidity: 80% up to 31 °C (88 °F), decreasing
linearly to 50% at 50 °C (122 °F)
Altitude: 2000 m (6562 ft.) Indoor use
Standards
EMI/EMC Standards: EN50082-1
   EN61000-4-2
   EN61000-4-3
   EN61000-4-4
EN55022, Class A
Safety Standard: EN61010-1
Installation Category: Pollution Degree 2, Overvoltage Category II
as defined by IEC664
a Resolution of the IEEE 754 double-precision floating point type consisting of a 52-bit fraction and 11-bit exponent.

Please contact an AMI Sales Representative for more detailed information including compatible power supplies, function descriptions, communication command set, system diagrams, etc.


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