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Lake Shore Model 625 Superconducting MPS User’s Manual
1-4
Introduction
1.2
SPECIFICATIONS
Output
Type:
Bipolar, Four Quadrant, DC Current Source
Current Generation:
Linear regulation with digital setting and analog control
Current Range:
±60 A
Compliance Voltage:
±5 V maximum (nominal, both source and sink)
Maximum Power:
300 W
Load Reactance:
0 H to 100 H
Current Ripple (Max):
4 mA RMS at 60 A, (0.007%) into 1 m
load
(significantly reduced into a reactive load or at lower current)
Current Ripple Frequency:
Dominated by line frequency and its harmonics
Temperature Coefficient:
±15 ppm of full scale/°C
Line Regulation:
15 ppm/6% line change
Source Impedance:
25
Stability (1 h):
1 mA/h (after warm-up)
Stability (24 h):
10 mA/24 h (typical, dominated by temperature coefficient and line regulation)
Isolation:
Output optically isolated from chassis to prevent ground loops
Parallel Operation:
2 units can be paralleled for ±120 A, ±5 V operation
Protection:
Quench, Line Loss, Low Line Voltage, High Line Voltage, Output Over Voltage,
Output Over Current, Over Temperature, Remote Inhibit
(on critical error conditions, magnet discharges at 1 V nominal)
Output Programming
Internal Current Setting
Resolution:
0.1 mA (20 bit)
Settling Time:
600 ms for 1% step to within 0.1 mA into a resistive load
Accuracy:
±10 mA ±0.05% of setting
Operation:
Keypad, computer interface
Protection:
Current setting limit
Internal Current Ramp
Ramp Rate:
0.1 mA/s to 99.999 A/s (compliance limited)
Update Rate:
27.7 increments/s
Ramp Segments:
5
Operation:
Keypad, computer interface, trigger input
Protection:
Ramp rate limit
External Current Programming
Sensitivity:
6 V = 60 A
Resolution:
Analog
Accuracy:
±10 mA ±1% of setting
Bandwidth (3 dB):
40 Hz, 2-pole, low-pass filter (10 Hz pass band, compliance limited)
Input Resistance:
>50 k
Operation:
Voltage program through rear panel
Connector:
Shared 15-pin D-sub
Limits:
Internally clamped at 6.1V
Compliance Voltage Setting
Range:
0.1 V to 5.0 V
Resolution:
100 µV
Accuracy:
±10 mV ±1% of setting
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