In General
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Recording Channels
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4 channels in the Basic System, expandable by the use of an Add-On Detector Module to
8 channels. Applications using more than eight measuring channels are also practicable,
please contact us for details.
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AC Input Voltage
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230 VAC ± 10 %, 50 Hz (115 VAC ± 10%, 60 Hz on request)
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Power Consumption
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300 VA max. during normal operation, 5 VA max during Standby
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LC-Display
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2 x 16 characters, user selectable backlight intensity
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Control Elements
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Main switch at the rear panel, Power On / Standby switch,
multifunctional rotary-/ push-button for the menu of each Detector Module (operation
lockable by the user)
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Outline Dimensions
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19" / 3 HU rack mountable or desktop case,
approx. 483 x 140 x 380 mm (w x h x d)
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Weight
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Basic-System approx. 10 kg,
Add-On Detector Module approx. 1 kg
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Performance
(see also the diagrams below)
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In General
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User selectable output format of the readings:
- Linear angular data for the horizontal and the vertical plane
- Raw data for the X-, Y- and Z-signals
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Output Data Rate
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Depending on the number of processed channels, user selectable:
- 4000 Hz (1 channel per Detector Module processed)
- 2000 Hz (2 channels per Detector Module processed)
- 1000 Hz (4 channels per Detector Module processed)
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Recording Range
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360° in the horizontal plane
±80° in the vertical plane
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Resolution
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< 0.05°
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Noise
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< 0.09° peak-peak (search coil orientation: horizontal 180°, vertical 0°)
< 0.36° peak-peak (search coil orientation: horizontal 180°, vertical 80°)
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Drift
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< 0.1° within 30 minutes after power-on (warm-up), negligible
after warm up
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Linearity Error Horizontal
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Horizontal < 0.5° deviation within 360°
Vertical
< 0.3° deviation between ±70°
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Channel Matching
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< ±0.1°
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Analog Outputs
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Resolution
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12 Bit
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Output Voltage Swing
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User selectable:
±2.5 V, ±4.5 V, ±5 V, ±9 V, ±10 V
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Output Impedance
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50 Ohm
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Serial Interface
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In General
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The bidirectional serial interface (RS-232) of each Detector Module transmits the measuring data and may be used to control the system
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Parameters
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115200 bps, 8 data bits, 1 stop bit, no parity
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Handshake Mode
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Hardware (RTS / CTS)
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Field Signals
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In General
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Three sine wave field signals, (crystal-controlled digitally synthesized),
amplified by three physically separated power amplifiers with symmetrical outputs
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Frequencies
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80 kHz (X-axis)
96 kHz (Y-axis)
120 kHz (Z-axis)
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Nominal Output Voltage
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Depend on the size of the field coils, where the nominal output voltages are tuned at the factory to achieve the specified flux density (see
"Magnetic flux density") and an optimal field homogeneity at the 3D-centre of the field coils.
The factory-tuned nominal output voltages may be attenuated by the user in steps of 20 % down to zero
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Maximum Output Voltage
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26 Vpp referenced to system ground (52 Vpp differential measured)
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Output Impedance
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0.2 Ohm max.
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Preamplifier
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In General
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Each preamplifier is loacted in a separate housing,
user selectable gain mode (AGC or user adjustable gain per channel)
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Recording Channels
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4 channels
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Supply Voltage
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±5 V,
±500 mA max. (power supply is provided by the Detector Module)
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Outline Dimensions
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100 x 40 x 200 mm (w x h x d)
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Weight
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330 g
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Coil Frame
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In General
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Three coils with two turns each, arranged as a cube
Optional version 'Removable Bars' available, which allows the straightforward opening of the coil frame, e.g. to insert a primate chair.
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Magnetic Flux Density
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15 uT typical at the nominal output voltage of the field signals. The magnetic flux density may be
attenuated by the user in steps of 20 % down to zero (see "Nominal output voltages")
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Coil Material
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Anodized Aluminum bars, cross section 8 mm
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Coil Colors
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Various colors available, contact Primelec for further information
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Dimensions
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Dimension L1 is freely definable within the range from 250 mm to 700 mm,
the other dimensions (L2 to L5) are resultant |
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L1: |
250 ... 700 mm |
L2: |
L1 - 16 mm |
L3: |
L1 - 27 mm |
L4: |
L1 + 36 mm |
L5: |
L1 + 26 mm |
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Weight
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Depends on the coil dimensions, for example approx. 5 kg for L1 = 700 mm
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Search Coils
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Material
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Preferably double insulated copper wire, Ø 20µm
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Weight
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Depends on material, dimensions and manufacturing process,
for example approx. 2 mg for a double insulated copper coil with
D = 2mm and n = 80
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DC-Resistance
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300 Ohm max. (3 Ohm ... 100 Ohm typical)
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Diameter
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2 mm ... 40 mm typical (see also "Effective area")
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Number of Turns
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1... 1000 typical (see also "Effective area")
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Effective Area
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1 cm2 ... 32 cm2 (Aeff = n D^2 pi / 4)
The range of the effective area specified above refers to the
typical magnetic flux density. If the flux density is reduced by attenuating the field signals to 20 % of their nominal values, the allowed effective area may be up to approx. 150
cm2
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Diagrams
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Typical progression of the output voltage
(horizontal plane)
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Typical progression of the output voltage
(vertical plane)
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Warm-Up drift (Notes 1 to 4)
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Horizontal linearity and crosstalk to vertical, Beta at 0° (Notes 1 to 4)
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Vertical linearity and crosstalk to horizontal, Alpha at 180° (Notes 1 to 4)
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Distribution of angular noise (Notes 1 to 5)
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Note 1:
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Measurement executed with 8 channels working (i.e. max
internal power dissipation). The data was acquired over
the serial interface. Measuring channel 1 was used, where
the performance of all measuring channels is identical.
Used settings:
- Field Signals: 100% of their nominal values
- Gain Correction: Disabled
- Gain Mode: AGC
- Offset Correction: Disabled
- Output Mode: Angular Data
- Output Filter: Disabled
- Output Swing: ± 9 V
- Processing Mode: All four channels
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Note 2:
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Measurement executed with a stepper-motor driven
search coil under software control
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Note 3:
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Used coil frame formed as a monocoque cube, s = 70 cm
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Note 4:
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Used search coil with an effective area = 10.8 cm2 (Ø 37 mm, 1 turn),
DC Resistance = 7 ohm, placed at the 3D-center of the coil frame
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Note 5:
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Distribution of angular noise is based on 5000 continuosly acquired samples
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