I searched with google images, guesses, every way I could. Is it a diode? Light bulb? The package says 2-0q0887.
The best I can figure it may be a germanium diode. An ohmmeter reads 00.0.
It is red on one end and purple on the other.
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3\$\begingroup\$ They look like fuses. 0 ohms is expected for an unblown fuse. \$\endgroup\$– John DotyCommented Feb 12 at 15:45
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1\$\begingroup\$ Unlikely diodes, as they don't have clearly visible polarity marking and their "legs" are equal length. Given the zero resistance (assuming you are measuring it correctly) and glass body, these might be fuses. \$\endgroup\$– Eugene Sh.Commented Feb 12 at 16:09
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1\$\begingroup\$ @winny shouldn't gas discharge tubes read infinite ohm with a normal (non high voltage) ohm meter? \$\endgroup\$– ArsenalCommented Feb 12 at 16:46
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\$\begingroup\$ @Arsenal Good catch! A fuse in non-standard size? \$\endgroup\$– winnyCommented Feb 12 at 17:07
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2 Answers
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If they are diodes, they will have a voltage drop in one direction across them. Put the meter in diode mode and measure (both ways) again. If you see a voltage while in diode mode in one direction, then it's a diode.
The most significant difference between a silicon diode and a germanium diode is that silicon diodes have higher threshold voltage (typically 0.7 volts) and high thermal stability, whereas germanium diodes have lower threshold voltage (typically 0.3 volts) and lower thermal stability
Source: Difference between Silicon Diode and Germanium Diode
If it's not that then it's probably a fuse since it's reading 0 Ω. I have never measured a GDT directly but would think that it would read open and not 0 Ω (closed) since it's a voltage shunt device. Another thing it could be is a resistor, but that wouldn't make much sense as it should be more than 0 Ω. Bulbs also have resistance to them.
answered Feb 12 at 16:45
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The parts are likely to be fuses due to the 00.0 ohm. Also - the case is transparent as this will allow a visual indication if it is fused or not.
