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Model 643 specifications

Output

Type	Bipolar, 4-quadrant, DC current source
Current generation	Fully linear regulation with digital setting and analog control
Current range	±70 A
Compliance voltage (DC)	±35 V nominal
Power	2450 W nominal
Maximum load resistance	0.6 Ω for ±70 A DC operation at +10% to -5% line voltage
Minimum load resistance	0.4 Ω for ±70 A DC operation at +5% to -10% line voltage
Load inductance range	0 to 1 H
Current ripple	5 mA RMS (0.007%) at 70 A into nominal load
Current ripple frequency	Dominated by the line frequency and its harmonics
Temperature coefficient	±15 ppm of full scale/°C
Line regulation	±60 ppm of full scale/10% line change
Stability (1 h)	1 mA/h (after warm-up)
Stability (24 h)	5 mA/24 h (typical, 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, 100 A/s maximum into a resistive load
Compliance voltage (AC)	±43 V at +10% to -5% line
Setting time	<1 s for 10% step to within 1 mA of output into nominal load
Modulation response	=0.17 Hz at ±70 A sine wave into nominal load, <0.02% THD; =1 Hz at ±10 A sine wave into nominal load, <0.05% THD; =10 Hz at ±1 A sine wave into nominal load, <0.10% 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 6.4 mm (0.25 in) holes for M6 or 0.25 in bolts

Output programming

Internal current setting
Resolution	0.1 mA (20-bit)
Settling time	600 ms for 1% step to within 1 mA (of internal setting)
Accuracy	±10 mA ±0.05% of setting
Operation	Keypad, computer interface
Protection	Programmable current setting limit
Internal current ramp
Ramp rate	0.0001 A/s to 50.0000 A/s (compliance limited)
Update rate	23.7 increments/s
Ramp segments	5
Operation	Keypad, computer interface
Protection	Programmable ramp rate limit
External current programming
Sensitivity	10 V/70 A
Resolution	Analog
Accuracy	±10 mA ±1% of setting
Input resistance	20 kΩ
Operation	Voltage program through rear panel, can be summed with internal current setting
Limits	Internally clamped at ±10.1 V and bandwidth limited at 40 Hz to protect output
Connector	Shared 15-pin D-sub

Readings

Output current
Resolution	0.1 mA
Accuracy	±10 mA ±0.05% of rdg
Update rate	2.5 rdg/s display, 10 rdg/s interface
Output voltage (at supply terminals)
Resolution	1 mV
Accuracy	±5 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	26 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	B-type USB connector
Software support	LabVIEW™ driver
Output current monitor
Sensitivity	7 V/70 A
Accuracy	±1.5% of full scale
Noise	1 mV RMS
Source impedance	20 Ω
Connector	Shared 15-pin D-sub
Output voltage monitor
Sensitivity	3.5 V/35 V
Accuracy	1% of full scale
Noise	1 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; jumper required if unused
Valve power output	24 VAC at 1 A maximum, automatic or manual control
Connector	Shared 4-pin detachable terminal block
Flow switch and 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 A maximum, automatic or manual control
Connector	Shared 4-pin detachable terminal block
Flow, temperature switch, and water valve not included
Auxiliary
Emergency stop	Requires 1 A, 24 VAC normally closed (NC) contact closure 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
Emergency stop and inhibit switches not included

General

Line power
Power	5500 VA max
Voltage and current	200/208 VAC ±10%, 13 A/phase; 220/230 VAC ±10%, 12 A/phase; 380 VAC ±10%, 7 A/phase; 400/415 VAC ±10%, 6.5 A/phase
Protection	3-phase thermal relay with adjustable current setting; two class CC 0.25 A fuses; over-voltage lockout circuit.
Frequency	50 Hz or 60 Hz
Configuration	3-phase delta
Connector	4-pin terminal block
Features	Soft start circuit, rear panel voltage selection indicator
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	5.7 L (1.5 gal)/min minimum
Pressure range	34 kPa (5 psi) to 552 kPa (80 psi)
Pressure drop	10 kPa (1.5 psi) at 5.7 L (1.5 gal)/min minimum for power supply only
Temperature	15 °C to 30 °C (non-condensing)
Connection	Two 10 mm (0.38 in) hose barbs
CAUTION: Internal condensation can cause damage to the power supply

Enclosure type	7 U high, 19 in rack mount with integral rack mount ears (25 mm (1 in) air space required on each side for ventilation)
Size	483 mm W × 310 mm H × 572 mm D (19 in × 12.2 in × 22.5 in) with handles removed
Weight	74 kg (163 lb)
Shipping size	762 mm W × 660 mm H × 559 mm D (30 in × 26 in × 22 in)
Shipping weight	107 kg (235 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 EN61010-3, EMC compliance to EN55022-1

Model 643 specifications

Output

Output programming

Internal current setting

Internal current ramp

External current programming

Readings

Output current

Output voltage (at supply terminals)

Front panel

Interface

IEEE-488.2 interface

USB interface

Output current monitor

Output voltage monitor

Power supply cooling water

Magnet cooling water

Auxiliary

General

Line power

Cooling water