625 specifications

All specifications are subject to change

Output

Type	Bipolar, 4-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 mΩ 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 Ω
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, and remote inhibit (on critical error conditions, magnet discharges at 1 V nominal)

Internal current settings
Resolution	0.1 mA (20-bit)
Settling time	600 ms for 1% step to within 0.1 mA into a resistive lead
Accuracy	±10 mA ±0.05% of setting
Operation	Keyboard, 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, and 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 kΩ
Operation	Voltage program through rear panel
Connector	Shared 15-pin D-sub
Limits	Internally clamped at 6.1 V
Compliance voltage setting
Range	0.1 V to 5.0 V
Resolution	100 µV
Accuracy	±10 mV ±1% of reading

Output current
Resolution	0.1 mA
Accuracy	±1 mA ±0.05% of reading
Update rate	2.5 readings/s display, 10 readings/s interface
Compensation	Compensated for lead resistance and 25 Ω source resistance
Output voltage (at supply terminals)
Resolution	100 µV
Accuracy	±1 mV ±0.05% of reading
Update rate	2.5 readings/s display, 5 readings/s interface
Remote voltage (at magnet leads)
Resolution	100 µV
Accuracy	±1 mV ±0.05% of reading
Update rate	1.25 readings/s
Input resistance	>50 kΩ
Connector	Shared 15-pin D-sub

Current range	10 mA to 125 mA
Compliance voltage (minimum)	12 V or 21 V selectable
Heater resistance (minimum)	10 Ω
Setting resolution	1 mA
Accuracy	±1 mA
Operation	On/Off with lockout delay of 5 s to 100 s
Protection	Open or shorted heater detection, error message if off and on output currents differ
Connector	BNC

Display type	8-line by 40-character, graphic vacuum fluorescent display module
Display readings	Output current, calculated field (T to G), output voltage, and remote voltage sense
Display settings	Output current, calculated field, compliance voltage, and ramp rate
Display annunciators	Status and errors
LED annunciators	PSHO on, remote, compliance limit, fault, and ramping
Keypad type	26 full travel keys
Keypad functions	Direct access to common operations, menu-driven setup

Ambient temperature	15 ºC to 35 ºC
Cooling	Air-cooled with internal 2-speed fan
Warm-up	30 min at output current setting
Line power	100, 120, 220, 240 VAC +6% -10%, single phase, 50 or 60 Hz, 850 VA
Size	483 mm W × 178 mm H × 520 mm D (19 in × 7 in × 20.5 in), rack mount (integrated rack mount ears)
Weight	27.2 kg (60 lb)
Calibration schedule	1 year