MODEL 2G600 AUTOMATIC SAMPLE DEGAUSSING SYSTEM
- High maximum field 2.5 kOe
- High field uniformity over sample region 1%
Provides for manual or computer controlled sample degaussing. Computer
control is implemented with a high level command language over an
RS232 data link
Field incrementation at field zero crossings with equal positive
and negative field excursions
Very low treatment induced (spurious) magnetization
High accuracy magnetic field settings provided by coil current feedback
- Rate of field increase and decrease and time at maximum field
are manually or computer selectable
- Precision geologic sample demagnetization using tumblers or
sequential 3 axis demagnetization
- Material demagnetization to reduce effects of magnetic contamination
The 2G600 Sample Degaussing System is intended to allow automatic
degaussing of samples up to 2.5 kOe with a standard air cooled solenoid
(Model 2G601). The 2G600 System can be completely controlled by
an external computer over a serial RS232 data link.
When used with an automatic sample handler (e.g. Model 2G800) and
a rock magnetometer measuring system (e.g. Model 2G760R), a complete
sequence of measure and degauss cycles can be completed without
removing the specimen from the holder.
The magnetic field amplitude is controlled by a 12 bit electronic
attenuator; the attenuator is incremented at zero crossings with
a user controlled number (1,2,4 or 8) of full cycles between amplitude
incrementation. This ensures that the samples are always subjected
to an equal number of equal amplitude positive and negative cycles
between attenuator incrementations.
This attenuation technique coupled with the use of very low leakage
and low corona AC capacitors and a low distortion power amplifier
greatly reduces the production of treatment induced magnetizations.
Because the degaussing coils tend to heat up with use, it is necessary
to measure and control the coil current to ensure that an accurate
and precise peak magnetic field is achieved.
We accomplish this by measuring the voltage drop across a small
(0.25 ohm) precision resistor in series with the coil. This permits
a magnetic field amplitude accuracy of 1% to be achieved even when
very high fields (hence high coil heating) are used continuously.
- Standard solenoidal (2G601S) 2.5 kOe maximum field
- Transverse split pair (2G601T) 2.0 kOe maximum field
Low loss mu metal shield system
Switch selectable: manual or computer
Maximum field (with 2G601S coil) 2.5 kOe
Peak field amplitude accuracy 1%
Peak field amplitude setability 0.5 Oe
Frequency of operation with 136 Hz 2G601S coil
Rate of field increase or decrease (selectable): Range Oe/sec. f
68 2f 34 4f 17 8f 8.5
Dwell time at maximum field selectable in 1 second increments from
0 to 9 seconds
Size and weight: 5"Hx19"Wx17"D
Control chassis 10 lbs. capacitor and current 10"Hx19"Wx19"D
Feedback chassis 15 lbs. coil (2G601S) 8.6"ODx5.5"L
Cylindrical shape with 3.15" diameter bore sample access 90 lbs.
power amplifier 10"Hx19"Wx17"D 75 lbs.
Power requirements 115V @ 1 A or 220V @ 0.5
A control chassis capacitator chassis 115V @ 0.5 A or 220V @ 0.3
A power amplifier 115V @ 20 A or 220V @ 15 A
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