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Philips Polarity indicator for two polar voltage Testers

Philips Polarity indicator for two polar voltage Testers

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For testing if a conductor is disconnect from electric current it is import two use a testing device that uses the line voltage (Voltage to check) itself to show if there is Voltage. So a digital multimeter is not suitable for this. Also most analogue meters made since the 60s are not suited as the partly use battery operated amplifier circuits for the analogue meter. Thatfor small two probe voltage indicators were made out an power resistor and an neon glow lamp. The better one even had an polarity indicator. The lamp shown here is one of these.
It would have been installed in on of the probe. If both electrode glow it would indicate that an AC Current is present. If the + glows it would indicate the the probe with the lamp built in would be the positive side of the circuit.

IMG_8197.JPG Osram_210-230V_.JPG Philips_made_in_holland_110-750v_-o-_typ_4017T_.JPG Unbekannte2C_kronung_Elisabath_die_zweite.JPG

Light Information

Light Information

Manufacturer:Philips
Model Reference:4017t
Lamp
Lamp Type:low pressure Neon discharge lamp negative typ.
Filament/Radiator Type:Steel electrodes
Base:brass schell
Shape/Finish:tubular clear
Service Life:long
Fixture
Fixture Type:two pole voltage identifiers
Ballast Type:Resistor
Socket Type:Schell
Location:In my collection of courseion
Electrical
Wattage:unsure
Voltage:110-750V ~/⎓ line voltage
Physical/Production
Assembly Line:Philips Netherlands
Fabrication Date:c. 1940
Application/Use:two pole voltage indicator

File information

File information

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Filename:Philips_made_in_holland_110-750v_-o-_typ_4017T_.JPG
Album name:Alex / Special lamps
Keywords:Lamps
File Size:403 KB
Date added:Dec 20, 2019
Dimensions:2464 x 1848 pixels
Displayed:46 times
Date Time:2019:03:08 11:26:21
DateTime Original:2019:03:08 11:26:21
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Exposure Time:1/40 sec
FNumber:f 3.6
Flash:No Flash
Focal length:4.5 mm
ISO:100
Make:Canon
Model:Canon IXUS 170
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URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-169645
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Comments
rjluna2
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Robert


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Dec 20, 2019 at 10:17 AM Author: rjluna2
That is an interesting bulb you have here, Alex

Pretty, please no more Chinese failure.

migette1
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Peter


migette1
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Dec 21, 2019 at 05:20 AM Author: migette1
This is a polarity tester for DC testing very rare item...

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

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