Cs-3 Manual - Scintrex

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Operating the CS-3 in the FieldFigure 5 - Hemisphere Switch Logic Diagram"R" - Remote 80HZ (JP3 - OFF, JP2 - ON)In the position "R" of the Hemisphere switch, the setting of the operatinghemisphere is actuated remotely by superimposing an 80 Hz sine signal onthe D.C. supply voltage. This can be conveniently achieved by coupling thecontrol signal voltage through a transformer at a convenient remote location.In the absence of the signal, the CS-3 is set to operate in the northernoperating hemisphere.To set the CS-3 for the operation in the southern operating hemisphereminimum AC signal amplitude of 50mV Vpeak is required at the frequencyof (80+/-5)Hz at the power input line to the CS-3. Please note, that thecontrol signal frequency has been selected far away from the Larmor signalfrequency range to make the interference with the magnetic fieldmeasurement negligible. The input amplifier of the magnetic processorsfilters out efficiently the frequencies outside the Larmor frequency range.2-8CS-3 Manual - part # 762701Revision 1.0
Setting the Operating HemisphereElectronic Control "L"In the position "L" of the Hemisphere switch, the setting of the operatinghemisphere is actuated by the TTL compatible control voltage level at the pinD of the four pin I/O connector: open circuited or high level voltage forsetting the operation in southern hemisphere, low level voltage or shortconnection to the pin A for operation in northern operating hemisphere.The control voltage could be supplied to the connector pins D and A througha coaxial cable or a pair of twisted wires. The length of the cable or the wiresis not critical, as the control voltage is D.C. signal.SummaryIf the CS-3 is properly oriented inside the active zone, defined by equations(1) and (2) in Chapter 3, “Orienting Your CS-3”, and the operatinghemisphere is not set properly either of following will happen:• There will be no Larmor signal at the output. By setting the operation to theproper operating hemisphere, the Larmor signal will appear.• There will be signal at the output, but not at the Larmor frequency. The falsemagnetic field reading will be higher than the true reading, obtained whenthe operating hemisphere setting is correct (about 60nT higher if the ambientfield is 60,000nT). In addition, it will be much noisier.The reason for this is the existence of another resonant line, smaller inamplitude and opposite in phase from the desired resonant signal. Theself-oscillation based on this signal can take place if the operatinghemisphere is wrongly selected. By setting the operation to the properoperating hemisphere, the true, lower value and less noisier, magnetic fieldreading will be obtained.The described alternative modes of controlling the operating hemisphere ofthe CS-3 are incompatible with the optional electronic control used in oldermodels of Varian and Scintrex magnetometers.The reversing of the magnetometer power supply polarity, used in these oldermagnetometer models, had certain disadvantages and it was abandoned in theCS-3. It is not difficult to change the existing installations by rewiring theswitch used for the power supply reversal and to make it perform levelcontrol required by the electronic control mode "L", as described in thissection, or by automatic hemisphere switching.Operations2-9CS-3 Manual - part #762701 Revision 1.0
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Page 5 and 6: Table of ContentsTable of Contents
Page 7 and 8: ForewordForewordThe CS-3 is an opti
Page 9 and 10: High Gradient ToleranceAbsorption c
Page 11 and 12: • the interfering EM field are no
Page 13 and 14: 1 GettingStartedStartupAbout this m
Page 15 and 16: About this manualChapter LayoutThis
Page 17 and 18: Understanding Instrument BasicsUnde
Page 19 and 20: Understanding Instrument BasicsSens
Page 21 and 22: Understanding Instrument BasicsIt p
Page 23 and 24: 2 Operating theCS-3 in theFieldBy n
Page 25 and 26: Setting Up the CS-3Mounting the CS-
Page 27 and 28: Obtaining the Larmor SignalObtainin
Page 29: Setting the Operating HemisphereSet
Page 33 and 34: Operating in the Presence of Spurio
Page 35 and 36: 3 OrientingYour CS-3An ideal magnet
Page 37 and 38: in the southern polar orientation t
Page 39 and 40: OrientationFigure 7a - Plot of tumb
Page 41 and 42: Using a Strapped Down CS-3 for Surv
Page 43 and 44: Sensor Inclination 90°From the gra
Page 45 and 46: Figure 10 - Plot of tumble angle ve
Page 47 and 48: Figure 12 - Plot of tumble angle ve
Page 49 and 50: Sensor Inclination 22.5°The orient
Page 51 and 52: Sensor Inclination 0°The orientati
Page 53 and 54: In the overlap regions the tumble a
Page 55 and 56: Only two orientations are useful an
Page 57 and 58: 4Maintaining YourCS-3 andTrouble-sh
Page 59 and 60: Trouble-shootingThere are largespur
Page 61 and 62: Reference5 ReferenceInformationCS-3
Page 63 and 64: Instrument Parts ListInstrument Par
Page 65 and 66: Warranty and RepairConcord, Ontario
Page 67 and 68: ATheory ofOperationTheorySystem Ove
Page 69 and 70: Therefore, no pumping is taking pla
Page 71 and 72: BCS-3 BlockDiagramTheoryAs shown on
Page 73 and 74: IndexAAbsorption cellmagnetic field
Page 75: Head Office222 Snidercroft RoadConc

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