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Model 648 Specifications

Output

Type	Bipolar, 4-quadrant, DC current source
Current generation	Fully linear regulation with digital setting and analog control
Current range	±135 A
Compliance voltage (DC)	±75 V
Power	9.1 kW nominal
Nominal load	0.5 Ω, 0.5 H
Maximum load resistance	0.55 Ω for ±135 A DC operation at +10% to -5% line voltage
Minimum load resistance	0.41 Ω for ±135 A DC operation at +5% to -10% line voltage
Load inductance range	0 H to 1 H
Current ripple	10 mA RMS (0.007%) at 135 A into nominal load
Current ripple frequency	Dominated by the line frequency and its harmonics
Temperature coefficient	±50 ppm of full scale/°C
Line regulation	±75 ppm of full scale/10% line change
Stability (1 h)	2 mA/h (after warm-up, internal setting)
Stability (24 h)	10 mA/24 h (typical, internal setting, dominated by temperature coefficient and line regulation)
Isolation	Differential output is optically isolated from chassis to prevent ground loops
Slew rate	50 A/s into nominal load (dominated by magnet characteristics), 100 A/s maximum into a resistive load
Setting time	<1 s for 10% step to within 1 mA of output into nominal load
Harmonic distortion	≤0.1 Hz at ±135 A sine wave into resistive load, <0.02% THD; ≤10 Hz at ±10 A sine wave into resistive load, <0.30% THD
Attenuation	-0.5 dB at 10 Hz
Protection	Short circuit, line loss, low line voltage, high line voltage, output over voltage, output over current, and over temperature
Connector	Two lugs with 8.64 mm (0.34 in) holes for M8 or 5/16 in bolts

Output programming

Internal current setting
Resolution	1.0 mA (20 bit)
Settling time	600 ms for 1% step to within 1 mA (of internal setting)
Accuracy	±20 mA ±0.05% of setting
Operation	Keypad, computer interface
Protection	Programmable current setting limit
Internal current ramp
Ramp rate	0.1 mA/s to 50.000 A/s (compliance limited)
Update rate	12.3 increments/s
Ramp segments	5
Operation	Keypad, computer interface
Protection	Programmable ramp rate limit
External current programming
Sensitivity	10 V/135 A
Resolution	Analog
Accuracy	±20 mA ±1% of setting
Input resistance	20 kΩ differential; 50 kΩ common-mode
Operation	Voltage program through rear panel, can be summed with internal current setting
Limits	Internally clamped at ±10.1 V and bandwidth limited -3 dB at 40 Hz (two pole, low pass filter)
Connector	Shared 15-pin D-sub

Readings

Output current
Resolution	1.0 mA
Accuracy	±20 mA ±0.05% of rdg
Update rate	2.5 rdg/s display, 10 rdg/s interface
Output voltage (at supply terminals)
Resolution	1.0 mV
Accuracy	±10 mV ±0.05% of rdg
Update rate	2.5 rdg/s display, 5 rdg/s interface

Front panel

Display type	8-line by 40-character, graphic vacuum fluorescent display module
Display readings	Output current, output voltage, and internal water temperature
Display settings	Output current and ramp rate
Display annunciators	Status and errors
LED annunciators	Fault, Compliance, Power Limit, Ramping, Remote
Audible annunciator	Errors and faults
Keypad type	20 full-travel keys
Keypad functions	Direct access to common operations, menu-driven setup
Power	Green flush ON and red extended OFF push buttons

Interface

IEEE-488.2 interface
Features	SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1
Reading rate	To 10 rdg/s
Software support	LabVIEW™ driver
USB interface
Function	Emulates a standard RS-232 serial port
Baud rates	57,600
Reading rate	To 10 rdg/s
Connector	Type B USB connector
Software support	LabVIEW™ driver
Output current monitor
Sensitivity	7 V/135 A
Accuracy	±1% of full scale
Noise	5 mV RMS
Source impedance	20 Ω
Connector	Shared 15-pin D-sub
Output voltage monitor
Sensitivity	7 V/70 V
Accuracy	1% of full scale
Noise	2 mV RMS
Source impedance	20 Ω
Connector	Shared 15-pin D-sub
Power supply cooling water
Remote enable input	TTL low or contact closure to enable output; used for mandatory 1 gal/min flow switch (included)
Connector	2-pin detachable terminal block connector
Valve power output	24 VAC at 1.5 A maximum, automatic or manual control
Connector	2-pin detachable terminal block connector
Water valve optional
Magnet cooling water
Remote enable input	TTL low or contact closure to enable output; jumper required if unused
Valve power output	24 VAC at 1.5 A maximum, automatic or manual control
Connector	Shared 4-pin detachable terminal block connector
Flow, temperature switch and water valve not included
Auxiliary
Emergency stop	Requires 1 A, 24 VAC normally closed (NC) contact to enable power-up; jumper required if unused
Fault output	Relay with normally open (NO) or normally closed (NC) contact, 30 VDC at 1 A
Remote enable input	TTL low or contact closure to enable output; jumper required if unused
Connector	Shared 8-pin detachable terminal block connector
Emergency stop and inhibit switches not included

General

Line power
Power	15.5 kVA max
Voltage and current	200 VAC ±5%, 41 A/phase 208 VAC ±5%, 40 A/phase 220 VAC ±5%, 38 A/phase 230 VAC ±5%, 37 A/phase 380 VAC ±5%, 23 A/phase 400 VAC ±5%, 21 A/phase 415 VAC ±5%, 21 A/phase
Protection	3-phase thermal relay with adjustable current setting; two class CC 2 A fuses; over-voltage lockout circuit
Frequency	50 Hz or 60 Hz
Configuration	3-phase delta
Connector	4-pin terminal block
Line voltage must be specified at time of order but is field reconfigurable; cable from power supply to facility power not included

Cooling water
Flow rate	7.6 L (2.0 gal)/min minimum
Maximum pressure	552 kPa (80 psi)
Pressure drop	159 kPa (23 psi) at 7.6 L (2.0 gal)/min minimum for power supply and mandatory flow switch
Temperature	15 °C to 30 °C (non-condensing)
Connection	Two 12.7 mm (0.5 in) hose barbs
CAUTION: Internal condensation can cause damage to the power supply

Enclosure type	Custom 19 in rack cabinet
Size	559 mm W × 1054 mm H × 673 mm D (22 in × 42 in × 26 in)
Weight	225 kg (495 lb)
Shipping size	914 mm W × 1219 mm H × 1168 mm D (36 in × 48 in × 46 in)
Shipping weight	281 kg (620 lb)
Ambient temperature	15 °C to 35 °C at rated accuracy, 5 °C to 40 °C at reduced accuracy
Humidity	Non-condensing
Warm-up	30 min at output current setting
Approvals	CE mark—low voltage compliance to EN61010-1, EMC compliance to EN61326-1