Lake Shore Model 642 Electromagnet Power Supply User’s Manual
1-4
Introduction
Specifications (Continued)
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
0.1 mA/s to 99.999 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 k
Ω
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
±
5 mA
±
0.05% of rdg
Update rate
2.5 rdg/s display, 10 rdg/s interface
Output voltage (at supply terminals)
Resolution 1mV
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
White flush ON and black extended OFF push buttons
