Rev. 7 7
Introduction
Specifications
1.4 Model 420 Specifications @ 25 °C
Additional Specifications for all Configurations
Magnet Current
Control Parameters
Standard Model 420 Configurations: Programmable Limits
± 5 A
± 10 A ± 100 A ± 200 A ± 300 A ± 600 A ± 2000 A
Measurement Resolution: 10 µA 20 µA0.2 mA 0.4 mA 0.6 mA 1.2 mA 4.0 mA
Accuracy: 0.1%
0.1% 0.1% 0.1% 0.1% 0.005% 0.005%
Minimum Ramp Rate: 10 µA/min
10 µA/min 0.1 mA/min 0.1 mA/min 0.1 mA/min 1 mA/min 1 mA/min
Maximum Ramp Rate: 1 A/sec
1 A/sec 10 A/sec 20 A/sec 30 A/sec 60 A/sec 100 A/sec
Magnet Current Control
Temperature Coefficient:
0.01% of I
max
/ °C
Stability: Better than 0.01% (40 min. warm-up)
Programming Resolution: 15 digits
a
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%
Temperature Coefficient:
0.005% of V
max
/ °C
Resolution: 20 µV
Stability: Better than 35 mV P-P when paused or holding
Magnet Voltage Measurement
Maximum Limits: −20 to +20 VDC
Accuracy:
0.1%
Temperature Coefficient:
0.01% of V
max
/ °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
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