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Low
Power (50 mW)
BITE Indicators
Model MI 51LP
Qualified to MIL-PRF-83287/4
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The MI 51LP is a miniature dual drum magnetic
latching indicator featuring a nonvolatile two-drum
display, excellent positive indication of a fault condition
with superior visibility in high ambient light. It is
fully qualified to MIL-PRF-83287 and is designed to
monitor electronic systems where space is limited.
Covered
by U.S. and Foreign Patents. Patent No. 3,465,333
Cleared by DOD/OFOISR for public release under 00-S-1235
dated April 17, 2000.
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| Features |
| • |
50
Milliwatt Sensitivity |
| • |
Manual
Reset |
| • |
Magnetic
Latching |
| • |
Environmentally
Sealed |
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OPERATION
When the indicator coil is energized with a 25 millisecond
(or longer) pulse, the highly visible drums spin 180
degrees and latches to the magnetic core. The drums
will remain magnetically latched to the core in the
position last pulsed. Even if the fault signal
is removed, the indicator will "remember"
that a fault had occurred.
Reset
is accomplished manually by rotating the knurled ring
clockwise 60 degrees. The knob returns to its normal
position automatically.
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| Standard
Coil Voltages and Resistances |
Nominal
Voltage DC |
Operating
Voltage |
DC
Coil Resistance
in Ohms, ±10% @ 25°C
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Min
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Max
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1.5
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1.2
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1.8
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45
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3
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2.4
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3.6
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180
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5
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4.0
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6.0
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500
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6
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4.8
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7.2
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720
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12
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9.6
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14.4
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2,880
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24
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19.2
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28.8
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11,500
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28
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22.4
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30.0
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15,700
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Pulse Power: 50 mw. |
| Pulse
Length: 25 milliseconds, minimum. |
| Dielectric
Withstanding Voltage: 500 VAC RMS |
| Insulation
Resistance: Mil Spec: Per MIL-PRF-83287.
100 megohms minimum at 500 VDC. |
| Electromagnetic
Interference and Magnetic Susceptibility:
Per MIL-PRF-83287. The MI 51LP will not
malfunction or false transfer when subjected
to a 20 ampere turn field at 400 Hertz. |
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| Case:
Black, anodized aluminum. |
| Mounting:
Front panel mount (D-hole or keyed washer). |
| Weight:
6.5 grams |
| Display
Colors: "NO FAULT" (reset) is black, "FAULT"
(set) is white, as shown. |
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Terminations: Solder terminals (turret
type), and wire leads standard per MIL-PRF-83287.
Loop terminals also available.
Designations are:
Turret Terminals TT
(Standard)
Wire
Leads WL
(Standard)
Loop Terminals LT
(Special)
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| Operating
Temperature Range: -65°C to +125°C. |
| Vibration*:
.06" D.A. or 15 G Peak, whichever is less, 10 Hz
to 2 KHz per MIL STD 202, Method 204, Test Condition
B. |
| Shock:
100 G's MIL STD 202, Method 213, Test Condition
I. |
| Moisture Resistance:
(Humidity): MIL STD 202, Method 106. |
| Barometric
Pressure : 100,000 ft., MIL STD 202, Method
105, Test Condition D. |
| Thermal Shock:
MIL STD 202, Method 107, Test Condition B. |
| Salt Spray:
MIL STD 202, Method 101, Test Condition B. |
| Life:
10,000 cycles at cycling rate of 10 per minute.
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| *During vibration
testing, caution should be taken to shield the indicator
from the strong magnetic field. |
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When
ordering, show model number first, then coil voltage
desired, then the color combination desired. If this
is a special part, factory modification number will
be added at the end of the ordering number.
Example:
Basic model for12 volts with white
as set color and black as reset color would be model
MI 51LP-12-W/BLK-TT.
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MI
51LP - 12 - W/BLK
- TT
- S
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Basic
Model
Number
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Coil
Voltage
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Fault
Color
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Terminal Type
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Factory
Modification
Number if Special
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MI
51LP
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1.5
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W/BLK
-White/Black
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LT-
Loop Terminal
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S.+
ID No.
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3 |
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WL-Wire
Leads |
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5 |
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TT-Turret
Terminals |
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6 |
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12 |
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24 |
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28 |
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Note: Dim. in ( ) are mm.
Tolerances: Decimals: ± .010 (0,25), Fractions:±
1/64 —
All mounting hardware is black anodized aluminum. Mounting
Torque: 5-7 in. lbs
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