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| Home > Lake Shore Products > Magnetic Instruments & Sensors > Gaussmeters > Model 421 |
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Model 421 Gaussmeter |
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 Back to Lake Shore Model 421 Gaussmeter product overview |
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| The Model 421 gaussmeter is obsolete and has been replaced by the new Model 425 gaussmeter. |
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| Performance |
High-performance instrumentation is no longer the exclusive domain of research laboratories. Performance requirements are tightening in every magnetic measurement application. In response, the Model 421 offers improved accuracy, resolution, noise floor, and update rate. |
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| Throughput |
| Throughput involves much more than update rate of an instrument. Usability of an instrument is just as important. The Model 421 has a large, bright, vacuum fluorescent display that can be seen easily in any lighting condition. The display updates quickly for fast feedback of probe or magnet positioning. The operation is straightforward with display prompts for the user. Max Hold, Alarm, and Sort features are included to streamline sorting and testing operations. |
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| Automation |
The Model 421 has a variety of interface features that are compatible with automated test configurations. The RS-232C serial computer interface can perform nearly every function of the instrument front panel. Two analog voltage outputs and an alarm relay facilitate automation without a computer. |
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| Probes |
The Model 421 is compatible with most Lake Shore gaussmeter Hall probes. When ordering the Model 421 with one of the gaussmeter Hall probes on the following page, a discounted package price is available. Lake Shore probes are factory calibrated for accuracy and interchangeability. Factory-calibrated probes feature a programmable read-only memory (PROM) in the probe connector so that calibration data can be read automatically by the instrument. Lake Shore can also custom design a probe to meet your specific application requirements. |
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| Display |
The Model 421 has a two line by 20 character vacuum fluorescent display. During normal operation, the display is used to report field readings and give results of other features such as max/min or relative. When setting instrument parameters, the display gives the operator meaningful prompts and feedback to simplify operation. The operator can also control display brightness. |
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| Following are three examples of the various display configurations: |
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| Normal Reading – the default mode with the display of the live DC field reading. |
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| Max DC Hold On – the maximum value is shown in the lower display while the upper display contains the live DC field reading. |
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| Alarm On – the alarm gives audible and visual indication of when the field value is selectively outside or inside a user specified range. An output relay facilities pass/fail actuation. |
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| Sort On – the live reading is shown in the upper display while the lower display contains the pass/fail (repetitive sorting or testing) message. |
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| Gaussmeter Hall Probes |
| The Model 421 includes one of the Lake Shore probes listed below - specify probe model number when ordering. Click here for details on properly selecting a probe and for a complete listing of available probe models. |
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| Axial Probes |
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L |
D |
A |
Active
area |
Stem
material |
Frequency range |
Usable full scale ranges |
Corrected accuracy (% rdg) |
Operating
temp range |
Temp
coefficient (max) zero |
Temp
coefficient (max)
calibration |
| MMA-2502-VH |
2 in
±0.063 in |
0.25 in dia
±0.006 in |
0.015 in
±0.005 in |
0.030 in dia
(approx) |
Aluminum |
DC and
10 Hz to
400 Hz |
30 G, 300 G,
3 kG, 30 kG |
±0.25%
to 30 kG |
0 ºC to
+75 ºC |
±0.09 G/ºC |
-0.04%/ºC |
| MNA-1904-VH |
4 in
±0.125 in |
0.187 in dia
±0.005 in |
0.005 in
±0.003 in |
Fiberglass
epoxy |
| MMA-2502-VG |
2 in
±0.063 in |
0.25 in dia
±0.006 in |
0.015 in
±0.005 in |
Aluminum |
300 G, 3 kG, 30 kG |
±0.15%
to 30 kG |
±0.13 G/ºC |
-0.005%/ºC |
| MNA-1904-VG |
4 in
±0.125 in |
0.187 in dia
±0.005 in |
0.005 in
±0.003 in |
Fiberglass
epoxy |
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| Transverse Probes |
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L |
T |
W |
A |
Active
area |
Stem
material |
Frequency range |
Usable
full scale
ranges |
Corrected accuracy (% rdg) |
Operating
temp
range |
Temp
coefficient (max) zero |
Temp
coefficient (max)
calibration |
| MMT-6J04-VH |
4 in
±0.125 in
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0.061 in
max |
0.180 in
±0.005 in |
0.150 in
±0.050 in
|
0.040 in dia
(approx) |
Aluminum |
DC |
30 G, 300 G,
3 kG, 30 kG |
±0.25%
to 30 kG |
0 ºC to
+75 ºC |
±0.09 G/ºC |
-0.04%/ºC |
| MNT-4E04-VH |
4 in
±0.125 in |
0.045 in
max |
0.150 in
±0.005 in |
Rigid glass
epoxy |
DC and 10 Hz to 400 Hz |
| MMT-6J04-VG |
4 in
±0.125 in |
0.061 in
max |
0.180 in
±0.005 in |
Aluminum |
DC |
300 G,
3 kG, 30 kG |
±0.15%
to 30 kG |
±0.13 G/ºC |
-0.005%/ºC |
| MNT-4E04-VG |
4 in
±0.125 in |
0.045 in
max |
0.150 in
±0.005 in |
Rigid glass
epoxy |
DC and 10 Hz to 400 Hz |
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| Flexible Transverse Probes |
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W |
T |
A |
Active
area |
Stem
material |
Frequency range |
Usable full scale ranges |
Corrected accuracy (% rdg) |
Operating
temp range |
Temp
coefficient (max) zero |
Temp
coefficient (max)
calibration |
| MFT-3E03-VH |
0.135 in
max
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0.025 in
max
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0.125 in
±0.005 in
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0.040 in dia
(approx) |
Flexible plastic tubing |
DC and
10 Hz to
400 Hz |
30 G, 300 G,
3 kG, 30 kG |
±0.25%
to 30 kG |
0 ºC to
+75 ºC |
±0.09 G/ºC |
-0.04%/ºC |
| MFT-3E03-VG |
300 G, 3 kG, 30 kG |
±0.15%
to 30 kG |
±0.13 G/ºC |
-0.005%/ºC |
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