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Gaussmeter Model 912 |
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Gaussmeter Model 912 |
Description
The Model 912/912T is a compact, accurate and stable instrument designed
for the measurement of permanent magnet, DC and AC magnetic fields with a high degree of
resolution. Flux density is displayed on a 4½ digit, bipolar, seven segment LED readout.
A rear panel switch allows the operator to reduce the resolution to 3½ digits when the
full capabilities of the instrument are not required.
The internal calibration circuit is factory adjusted using Reference Magnets with 0.2%
accuracy, certified traceable to the National Institute of Science and Technology.
All Hall Probes are marked with their own calibration constant. The mode of operation,
permanent magnet/DC, AC or peak, is selected by pushbutton switch. Peak mode enables
static (PM or DC) fields to be analyzed for maximum value with the highest reading held in
memory. Instrument zero is easily set by use of the coarse or fine zero controls. The five
ranges are selected by means of a rotary range selector.
A wide choice of both transverse and axial Hall Effect Probes are available to enable the
meter to measure many different configurations of magnetic fields.
The optional digital dual limit comparator is ideally suited to production line testing.
Minimum and maximum acceptable limits are set on the digital comparator; the operator need
only look at the indicator lights, resulting in less operator fatigue and error.
The BCD output from the display is compared with the thumbwheel limit set points resulting
in an accurate HI-GO-LO indication. The HI, GO, LO and NO GO (+5 VDC 30 ma internal
transistor) signals are available on the rear panel.
The differential adaptor (Model 913) expands the capabilities of the Model 912/912T to
enable differential magnetic measurements to be performed. In its differential mode, using
two probes, magnetic variations as small as 10 Gauss in a 1000 Gauss field can be
detected. Two probes are used to simultaneously measure the magnetic fields or the
gradient in a common field.
The IEEE-488, digital comparator and the Model 913 require the double wide or rack mount
cabinet.
Features
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Options |
Specifications
Full-Scale Range: Model 912-10, 100, 1K, 10K, 100K Gauss/
Model 912T-1 mT, 10mT, 100 mT, 1T, 10 Tesla, 100% over range on all but 100K and 10T range
Modes of Operation: Permanent Magnet/DC, AC and DC Peak
DC Accuracy: +/- (0.4% of reading + 0.1% of range + 1 digit)
AC Accuracy:
| Below 40 Hz | Not Calibrated |
| 41 to 400 Hz | +/-(1.5% of reading +0.5% of range) |
| 401 to 800 Hz | +/-(4% of reading +1% of range) |
| 801 to 1000Hz | +/-(6% of reading + 1% of range) |
(AC indications are average sensing peak reading)
Peak Reading Accuracy:+/-(0.8% of
reading + 0.2% of range) Peak reading applies to static, PM or DC, fields only. Decay time
is less than 0.1% in 10 seconds.
NOTE: Hall Effect Probes have a temperature coefficient and linearity of
their own which must be added to overall accuracy.
Operating Temperature: 0° C to 40° C, 32° F to 104° F
Temperature Coefficient: 0.05%/° C (instrument only)
Analog Output: +/- 5 volt via BNC connector. Instrument accuracy +0.2% of range.
Not directly calibrated in AC mode. AC waveform can be observed with instrument in DC
mode.
Power Requirements: 115/230 VAC 50/60 Hz. 30VA. Set by internal switch.
Dimensions:
| Single | Double Wide | |
| Width | 8.5 in (21.6 cm) | 17 in (43.2 cm) |
| Height | 4 in (10.2 cm) | |
| Depth | 13 in (33 cm) |
Rack Mount: Height is 3.5 in (8.89 cm)
Specifications subject to change without notice.
Contact our factory for additional
information.
Magnetic Instrumentation Inc., 8431 Castlewood Dr., Indianapolis, IN 46250-1534
E-mail: maginst@maginst.com, Tel. 317-842-7500,
Fax 317-849-7600
