Lakeshore Learning Materials 647 - Manual (Page 59)

Lake Shore Model 647 Magnet Power Supply User’s Manual
Options & Accessories 6-1
CHAPTER 6
OPTIONS AND ACCESSORIES
6.0 GENERAL
This chapter covers Model 647 MPS options and accessories: Model 6224 IEEE-488/Serial Interface
(Paragraph 6.1), Model 6476 Gaussmeter Input Card (Paragraph 6.2), Model 6477 High Resolution Display
and Programming Option (Paragraph 6.3), and Accessories (Paragraph 6.4).
6.1 MODEL 6224 IEEE-488/SERIAL INTERFACE
This option interfaces with a Customer-supplied computer equipped with a compatible IEEE-488 or Serial
Interface. It accesses operating data and stored parameters and remotely controls front panel operations.
Only one Model 6224 is required for multiple MPS installations. See Chapter 4 for MPS remote operation.
Installation Procedure
WARNING
• This procedure is intended for trained service personnel who understand electronic circuitry and
the hazards involved. Do not attempt this procedure unless qualified.
• To prevent shock hazard, turn off the instrument and disconnect AC line power and all test
equipment before proceeding.
1. Turn unit OFF and disconnect power cord.
2. Remove the two screws of the blank option cover plate to the far left of the MPS rear panel and remove
the cover plate. If another option exists in this slot, remove it. The IEEE cable should point down. Install
the option in the far slot to avoid IEEE cable interference with the power cord.
3. Slide the Model 6224 board into the MPS with the board handle towards the bottom of the MPS. Tighten
the two screws that secure the board to the MPS rear panel.
4. (If Required) Install the option removed from the Model 6224 slot into a different slot.
5. Set the IEEE-488 operating parameters as outlined in Paragraph 4.1.1 and the Serial Interface as
outlined in Paragraph 4.2.2.
6.2 MODEL 6476 GAUSSMETER INPUT CARD
This option provides quantitative magnetic field monitoring. Each input has independent excitation. Display
the field in kilogauss or tesla. Field interfacing supports Hall sensors and includes probe zero and entry of
probe sensitivity in millivolts per kilogauss. Below are specifications for the Model 6476 Gaussmeter Input
Card:
Cryogenic Hall Sensor Type: Lake Shore Model HGCT-3020 (transverse) or Model HGCA-3020 (axial)
Number of Inputs: 1 four-lead measurement
Nominal Excitation Current: 100 mA Display Resolution: 0.01 kG, 0.001 tesla
Probe Magnetic Sensitivity: 0.8 mV/kG ±30% Electronic Accuracy: 1% of full scale
Nominal Field Range: Nominal ±125 kG (@ 0.8 mV/kG)
Input Voltage Resolution: > 0.01 mV out of 0.1 volts full scale
Sample Interval: Probe excited continuously & read when level is not
Contact Lake Shore for details on a variety of Hall Probes and Sensors.
6.2.1 Hall Sensor Mounting Considerations
The Lake Shore Model HGCT-3020 (Transverse) and Model HGCA-3020 (Axial) Cryogenic Hall Sensors are
four terminal, solid state devices that produce output voltage proportional to the product of the input current,
magnetic flux density, and the sine of the angle between the field vector and the plane of the Hall generator.
The active area of the Model HGCT-3020 Transverse Hall Sensor is approximately 0.04 inch in diameter with
the center indicated by a cross on one face of the package. When the control current is applied with the red
lead positive with respect to the black lead, and the magnetic field is perpendicular into the face of the probe
with the cross on it, the Hall voltage will be positive at the blue lead with respect to the yellow lead. A reversal