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Related Manuals for Mirion Technologies 7401
Summary of Contents for Mirion Technologies 7401
- Page 1 Model 7401/7401VR Alpha Spectrometer User’s Manual 9231603C...
- Page 2 Copyright 2017, Mirion Technologies (Canberra), Inc . All rights reserved. The material in this document, including all information, pictures, graphics and text, is the property of Mirion Technologies (Canberra), Inc. and is protected by U.S. copyright laws and international copyright conventions.
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Page 3: Table Of Contents
Analog to Digital Converter ......................19 Microprocessor and Control Circuits ................... 19 A. Specifications ................20 Input .............................. 20 Display ............................20 Front Panel Controls and Indicators ..................... 20 Rear Panel Control ........................21 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... - Page 4 Calibration Pulser Pot Test (Test 5) ..................... 28 Discriminator Digital Pot Test (Test 6) ..................29 Pulser/Amp/Discriminator Test (Test 7) ..................29 E. Chamber Cleaning ................ 30 F. Installation Considerations ............31 G. FCC Notice ..................32 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C...
- Page 5 Product complies with appropriate current EU directives (Low Voltage & EMC). Product complies with appropriate current FCC /UL / CSA 61010-1 directives (Low Voltage & EMC). Manufacturer’s Address Mirion Technologies (Canberra), Inc. 800 Research Parkway Meriden, CT 06450 USA 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C iii iii...
- Page 6 Notes 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C...
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Page 7: Introduction
0-1000 µm Hg (0-133 Pa). Reverse sample bias is available as an option for the 7401 as Model 7401-RSB. The reverse bias is provided by four 3-volt batteries. For those who need to operate at a decreased vacuum, the Model 7401VR Alpha Spectrometer has a pressure gauge range of 0-20 mm Hg (0-2.67 kPa) and includes the 7401-RSB Reverse Sample Bias... -
Page 8: Controls And Connector
Chapter 2 Controls and Connector 2. Controls and Connector This is a brief description of the 7401’s controls and connectors. For more detailed information, refer to Appendix A, Specifications. Front Panel Figure 1 Front Panel Connectors 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 9: Rear Panel
Rear Panel Rear Panel Figure 2 Rear Panel Connectors 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 10: Internal Controls
Chapter 2 Controls and Connector Internal Controls Figure 3 Internal Controls 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 11: Vacuum Chamber
Vacuum Chamber Vacuum Chamber Note: For Reverse Sample Bias Kit installation, see drawing B-26491, which can be ordered from Canberra. Figure 4 Vacuum Chamber 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 12: Operating Instructions
7401’s Bias Switch should be OFF before installing or removing the unit. Slide the 7401 into the Bin, making sure that the cover on the right side of the unit is seated in the Bin’s top and bottom guide rails. After seating the unit firmly into the Bin’s power connector, turn the 7401’s front panel captive screws clockwise until... -
Page 13: Connecting The Pump
Connecting The Pump The vacuum pump is connected to the Model 7401 vacuum fitting located on the rear panel. The outside diameter of the fitting is 9.5 mm (3/8 in.). Use metal tubing and high quality rubber couplers wherever possible in the vacuum line to minimize outgassing and to ensure a short pumpdown time. -
Page 14: Operation
The INCrement/DECrement and DIGIT SELECT Switches are used to control the display function and to change the 7401’s settings. To change the display function, first make sure that no single digits are blinking. If a single digit is blinking, press the DIGIT SELECT Switch one or more times until all digits are steadily lit. -
Page 15: Initializing The Display
BIAS voltage and DISCriminator and CALibration pulser energies. Any of five digits can be changed in Preset Time (P-TIME). The Model 7401’s internal memory maintains BIAS, DISCriminator and CALibration pulser settings when the unit’s power is turned off. To insure proper memory operation, make sure that all changes to these settings have been completed before turning the 7401’s power off. -
Page 16: Setting Bias The First Time
The bias should always be turned OFF manually before the chamber is vented and the door is opened. The BIAS Switch should be turned ON manually only after the door has been closed and the pump-down has started. 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 17: Previous Bias Setting
MCA channel. Adjustment of the ADC Gain, Range and Digital Offset controls may also be necessary, as well as the ADC Zero. The 7401 amplifier offset is factory set to zero volts, but may be adjusted to ±200 mV. The amplifier output pulses and offset may be monitored at the front panel TEST POINT using an oscilloscope. -
Page 18: Using The Discriminator Counter/Timer
Multiple 7401s On a Single Pump A single vacuum pump can be connected to more than one 7401, however the pump down time may increase. To connect more than one unit to the vacuum pump, you must install a fitting or manifold system to expand the number of vacuum lines. - Page 19 Method C on page 14. Method A – Canberra PIPS Detectors Installed in All Model 7401s. This method can be used if the 7401 is equipped with a Canberra PIPS detector or other detector which is ruggedized and can tolerate exposure to changing pressure between 500 µm Hg and 700 µm Hg while bias is applied.
- Page 20 BIAS Switch. Bias will automatically be applied to the detector when the correct vacuum is reached. 8. When the serviced 7401 chamber attains a vacuum similar to the adjacent chambers, carefully change the valves on the adjacent chambers to the PUMP position.
- Page 21 2. Service vacuum pumps periodically. Do not wait for them to fail. Consult manufacturer’s instructions. 3. Replace filters periodically. Oil clogged filters will reduce pumping speed and may allow backstreaming. 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C...
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Page 22: Circuit Description
Chapter 4 Circuit Description 4. Circuit Description The block diagram, , summarizes the 7401 circuitry which performs several functions for this integrated module, including analog signal amplification, discrimination, low and high voltage power supply, vacuum gauge signal processing, test pulse generation, analog to digital conversion, digital and display control, and computing. -
Page 23: Auxiliary Circuits
115 V ac supplied by the NIM power supply which is boosted by transformer T1 then full-wave rectified, filtered by capacitor C3, and controlled by a discrete component series regulator. The output polarity is selected by a board- 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 24: Vacuum Gauge
J5. The 7401’s preset level can be either 100 or 500 µm Hg. The 7401VR’s preset level can be either 0.3 or 10 mm Hg. RV1 and RV2 adjust the thresholds. -
Page 25: Discriminator
In order to allow for processor reset without cycling the power, three front panel switches are connected to inverters in package A17, which sends a reset pulse to the microprocessor. 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 26: Specifications
HV bias, calibration pulser level or discriminator level. DIGIT SELECT - Pushbutton switch chooses display digit to be incremented or decremented; operable when setting preset time, HV bias, calibration pulser, or discriminator level. 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 27: Rear Panel Control
VACUUM/BIAS INTERLOCK SET POINT - Dual position jumper chooses vacuum level at which bias is enabled. 7401 nominal trip level is 100 or 500 µm Hg (13 or 67 Pa); factory set to 500 µm Hg (67 Pa). 7401VR nominal trip level is 0.3 mm Hg (0.04 kPa) or 10 mm Hg (1.33 kPa);... -
Page 28: Electronics Performance
Range - 0 to 20.00 µA Display Resolution - 0.01 µA VACUUM GAUGE 7401 Range - 0 to 1000 µm Hg (0 to 133 Pa) 7401VR Range - 0 to 20 mm Hg (0 to 2.67 kPa) COUNTER Count Range - 0 to 99 999 counts. -
Page 29: Connectors
X 2.5 in.) (height, width, depth). Stainless steel chamber, door, shelf and sample holder. SAMPLE SIZE - Up to 51 mm (2 in.) diameter MAXIMUM DETECTOR SIZE - 1200 mm SAMPLE-DETECTOR SPACING - 1 to 49 mm in 4 mm steps 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 30: Environmental
The average battery life is 8 years. MODEL 7401VR Alpha Spectrometer - Same as 7401 except the pressure gauge has a range of 0 to 20 mm Hg (0 to 2.67 kPa); also includes Model 7401-RSB Reverse Sample Bias option. -
Page 31: Pips Detector Information
Blow dry with dry air or dry nitrogen gas and vacuum pump for 15 minutes or so to remove residual moisture before applying bias. 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 32: Power-On Error Codes
Appendix C Power-On Error Codes C. Power-On Error Codes When the 7401 is turned on or reset from the front panel (Initializing the Display on page 9), the microprocessor runs several tests. If an error is detected one of the following error codes will be displayed: RAM test error. -
Page 33: Self Test
The 7401 will execute several internal tests when in the test mode, which is enabled by resetting the module. This is done by cycling power or using the front panel reset switches (Initializing the Display on page 9). -
Page 34: Display Test (Test 2)
This test is a long one, please wait for it to finish. E 5.0 – Pot cannot be set to lowest setting. E 5.1 – Pot fails mid-point check. E 5.2 – Pot fails high setting check. E 5.3 – Pot fails step-size check. 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 35: Discriminator Digital Pot Test (Test 6)
Checks that test pulser, amplifier and discriminator are calibrated and work correctly as a system. E 7.0 – No counts detected with discriminator level below pulser level. E 7.1 – Erroneous counts detected with discriminator level above pulser level. 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 36: Chamber Cleaning
O-rings. A sharp tool can damage the rubber parts. Nitrile (Buna N) and flourocarbon rubbers are used for the gaskets. If a gasket has been wiped clean, smooth on a light coat of silicone vacuum grease with the fingers before reassembling. 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... -
Page 37: Installation Considerations
• The use of CE compliant accessories such as fans, UPS, etc. Any repairs or maintenance should be performed by a qualified Mirion Technologies (Canberra) service representative. Failure to use exact replacement components, or failure to reassemble the unit as delivered, may affect the unit’s compliance with the specified EU requirements. -
Page 38: Fcc Notice
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. 7401/7401VR Alpha Spectrometer User’s Manual - 9231603C... - Page 39 _____________________________________________________ Warranty Mirion Technologies (Canberra) Inc. (we, us, our) warrants to the customer (you, your) that for a period of ninety (90) days from the date of shipment, software provided by us in connection with equipment manufactured by us shall operate in accordance with applicable specifications when used with equipment manufactured by us and that the media on which the software is provided shall be free from defects.
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