Model 643 Datasheet
Contents
1. For internal programming the Model 643 incorporates a proprietary 20 bit digital to analog converter DAC that is monotonic over the entire output range and provides resolution of 0 1 mA External programming provides unlimited resolution The Model 643 generates extremely smooth and continuous ramps with virtually no overshoot The digitally generated constant current ramp rate is variable between 0 1 mA s and 50 A s To ensure smooth ramp rate the power supply updates the high resolution DAC 23 7 times per second A low pass filter on the output DAC smooths the transitions at step changes during ramping e mail info lakeshore com E EJ Model 643 Electromagnet Power Supply Output reading The Model 643 provides high resolution output readings The output current reading reflects the actual current in the magnet and has a resolution of 0 1 mA The output voltage reading reports the voltage at the output terminals with a resolution of 0 1 mV All output readings can be prominently displayed on the front panel and read over the computer interface Protection The Model 643 provides built in protection against short circuit open circuit line loss low line voltage high line voltage output over voltage output over current over temperature and abrupt change of the external programming input In the event of water flow failure flow sensors provide feedback to the Model 643 and output current is set to 0 A Internal heat sin2. PPO DC1 DTO CO E1 Reading rate To 10 rdg s Software support National Instruments LabVIEW driver consult Lake Shore for availability USB interface Function Emulates a standard RS 232 serial port Baud rate 57 600 Reading rate To 10 rdg s Connector B type USB connector Software support National Instruments LabVIEW driver consult Lake Shore for availability Output current monitor Sensitivity 7 V 70 A Accuracy 1 of full scale Noise 1 mV RMS Source impedance 20 Q 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 Q 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 to enable power up jumper required if unused Fault output Relay with normally open NO or normally closed NC contact 30 V
3. 000 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 kQ 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 fax 614 818 1600 e mail info lakeshore com Model 643 Electromagnet Power Supply 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
4. 63 Ib Shipping size 635 mm W x 559 mm H x 736 mm D 25 in x 22 in x 29 in Shipping weight 79 5 kg 175 Ib 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 pending low voltage compliance to EN61010 3 EMC compliance to EN55022 1 Ordering Information Description Model 643 70 A 35 V 2 5 kW 204 208 VAC Model 643 70 A 35 V 2 5 kW 220 230 VAC Model 643 70 A 35 V 2 5 kW 380 VAC Model 643 70 A 35 V 2 5 kW 400 415 VAC Part Number 643 204 643 225 643 380 643 408 Accessories Included 6031 Two front handles 6032 Two rear handles 6051 Terminal block 4 pin 6052 Terminal block 8 pin 6252 15 pin D sub mating connector analog 1 0 Hose clamps Power cable strain relief power cable not included Calibration certificate Model 643 user manual MAN 643 Accessories Available 6201 1 m 3 3 ft long IEEE 488 GPIB computer interface cable assembly 6261 3 m 10 ft magnet cable kit AWG 4t 6262 6 m 20 ft magnet cable kit AWG 4 CAL 643 CERT Instrument recalibration with certificate CAL 643 DATA Instrument recalibration with certificate and data 6041 Water flow switch 6042 Water valve All specifications are subject to change without notice fax 614 818 1600 e mail info lakeshore com
5. DC at 1A 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 www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 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 x 310 mm H x 572 mm D 19 in x 12 2 in x 22 5 in with handles removed Weight 74 kg 1
6. W Bipolar linear true 4 quadrant output M 70 A 35 V 2450 W M Can be modulated to frequencies up to 0 17 Hz at 70 A HM Low noise WE 0 1 mA of programmed Current resolution WE Analog programming and IEEE 488 and USB interfaces M Built in fault protection E Compact design Introduction The Model 643 electromagnet power supply is a linear bipolar current source providing true 4 quadrant output eliminating the need for external switching or operator intervention to reverse current polarity The Model 643 is capable of supplying 70 A 35 V to a nominal 0 5 Q 0 5 H load and the output can be modulated from an external source to frequencies up to 0 17 Hz at 70 A Internally programmed output provides 20 bit resolution while externally programmed output provides unlimited resolution The compact low noise design of the Model 643 makes it the ideal supply for use in laboratory settings When combined with a Lake Shore EM4 4 inch electromagnet and Model 475 DSP gaussmeter the Model 643 provides a versatile field control system ideal for a wide range of user defined applications These include but are not limited to magneto optical magnetic hysteresis and susceptibility and Hall effect measurements as well as in line annealing www lakeshore com Lake Shore Cryotronics Inc Model 643 Electromagnet Power Supply Model 643 Electromagnet Power Supply Output architecture The Model 643 output architec
7. ange 0 H 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 temperautre 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 Settling time lt 1 s for 10 step to within 1 mA of output into nominal load Modulation response lt 0 17 Hz at 70 A sine wave into nominal load lt 0 02 THD lt 1 Hz at 10 A sine wave into nominal load lt 0 05 THD lt 10 Hz at 1 A sine wave into nominal load lt 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 0
8. eing monitored The current monitor has a sensitivity of 7 V 70 A output while the voltage monitor has a sensitivity of 3 5 V 35 V output Display and keypad The Model 643 incorporates a large 8 line by 40 character vacuum fluorescent display Output current and output voltage readings are displayed simultaneously Five front panel LEDs provide quick verification of instrument status including ramping compliance fault power limit and computer interface mode Error conditions are indicated on the main display along with an audible beeper Extended error descriptions are available under the status key The keypad is arranged logically to separate the different functions of the power supply The most common functions of the power supply are accessed using a single button press The keypad can be locked in order to secure either all changes or just the instrument setup parameters allowing the supply output to be changed www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 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 Nominal load 0 5 Q 0 5 H Maximum load resistance 0 6 Q for 70 A DC operation at 10 to 5 line voltage Minimum load resistance 0 4 for 70 A DC operation at 5 to 10 line voltage Load inductance r
9. k cold plate and transformer temperatures are also monitored Warnings are displayed before temperature limits are exceeded and current is set to 0 A If temperatures continue to increase over safety limits the Model 643 turns off A proprietary circuit limits the power dissipated in the water cooled cold plate should low resistance and high line conditions exist The Model 643 protects itself if operated into resistances outside of nominal limits By limiting current output the power supply will safely operate into a shorted load and it operates safely into high resistance loads by limiting voltage output The Model 643 is also protected against power loss under full operation and nominal magnet load Both low and high power line conditions are reported on the front panel display Interfaces The Model 643 includes both parallel IEEE 488 and universal serial bus USB computer interfaces that provide access to operating data stored parameters and remote control of all front panel operating functions The USB interface emulates an RS 232C serial port at a fixed 57 600 baud rate but with the physical connections of a USB This allows you to download firmware upgrades ensuring your power supply is using the most current firmware version with no need for any physical changes The Model 643 also provides two analog monitors for output current and voltage Each monitor is a buffered differential analog voltage representation of the signal b
10. ture relies on low noise linear input and output stages The linear circuitry of the Model 643 permits operation with less electrical noise than switch mode electromagnet power supplies The clean field background allows greater resolution and finer detail in results drawn from data taken during high sensitivity experiments One key benefit of this architecture is CE compliance to the electromagnetic compatibility EMC directive including the radiated emissions requirement The true 4 quadrant output capability of the Model 643 is ideal for sweeping through both positive and negative fields Tightly integrated analog control of the 4 quadrant output provides smooth current change with very low overshoot This eliminates the need for external switching Or operator intervention to reverse the polarity significantly simplifying system design The transition through zero current is smooth and continuous allowing the user to readily control the magnetic field as polarity changes This is achieved without reversal contactors or relays which would produce unintended field spikes and other discontinuities As a result field hysteresis and other biases are avoided in the experimental data 614 891 2244 fax 614 818 1600 Output programming The Model 643 output current is programmed internally via the keypad or the computer interface externally by analog programming input or by the sum of the external and internal settings
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