Model 643 Specifications

Output

TypeBipolar, 4-quadrant, DC current source
Current generationFully linear regulation with digital setting and analog control
Current range ±70 A
Compliance voltage (DC) ±35 V nominal
Power 2450 W nominal
Maximum load resistance0.6 Ω for ±70 A DC operation at +10% to -5% line voltage
Minimum load resistance0.4 Ω for ±70 A DC operation at +5% to -10% line voltage
Load inductance range0 to 1 H
Current ripple5 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
ProtectionShort circuit, line loss, low line voltage, high line voltage, output over voltage, output over current, and over temperature
ConnectorTwo 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
ProtectionProgrammable 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

Sensitivity10 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
LimitsInternally clamped at ±10.1 V and bandwidth limited at 40 Hz to protect output
ConnectorShared 15-pin D-sub

Readings

Output current

Resolution 0.1 mA
Accuracy±10 mA ±0.05% of rdg
Update rate2.5 rdg/s display, 10 rdg/s interface

Output voltage (at supply terminals)

Resolution1 mV
Accuracy±5 mV ±0.05% of rdg
Update rate 2.5 rdg/s display, 5 rdg/s interface

Front panel

Display type8-line by 40-character, graphic vacuum fluorescent display module
Display readingsOutput current, output voltage, and internal water temperature
Display settings Output current and ramp rate
Display annunciators Status and errors
LED annunciatorsFault, Compliance, Power Limit, Ramping, Remote
Audible annunciatorErrors and faults
Keypad type 26 full-travel keys
Keypad functions Direct access to common operations, menu-driven setup
PowerGreen flush ON and red extended OFF push buttons

Interface

IEEE-488.2 interface

FeaturesSH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1
Reading rate To 10 rdg/s
Software support

LabVIEW™ driver

USB interface

FunctionEmulates a standard RS-232 serial port
Baud rates 57,600
Reading rate To 10 rdg/s
ConnectorB-type USB connector
Software support

LabVIEW™ driver

Output current monitor

Sensitivity7 V/70 A
Accuracy±1% of full scale
Noise1 mV RMS
Source impedance 20 Ω
Connector
Shared 15-pin D-sub

Output voltage monitor

Sensitivity3.5 V/35 V
Accuracy1% of full scale
Noise1 mV RMS
Source impedance20 Ω
Connector
Shared 15-pin D-sub

Power supply cooling water

Remote enable inputTTL low or contact closure to enable output; jumper required if unused
Valve power output24 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 inputTTL low or contact closure to enable output; jumper required if unused
Valve power output24 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

Power5500 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
Protection3-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
Connector4-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
Temperature15 °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
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