Question about Sperry Instruments HST401 Voltage Continuity Tester

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When do i know if the HST401 is working? What do i do?

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How do I check 8 volt golf cart batteries with an Argus AA500P Battery Analyzer?

Use the voltmeter and connect the test probe (red) to positive side of the battery..the other side on negative

Jun 13, 2014 | Sperry Instruments HST401 Voltage...

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If I am trying to find the 'hotwire' for lights how do I do that? Do I touch 1 wire and the junction box then the other and the junction box and whichever lights the instrument that is the hot wire?

Test for hot wire:
By code, hot wire should be black.

Take photo of wiring so everything can be put back.
Remove wires from device.
Separate wires for testing.
Use ordinary tester.
Test each wire to bare ground wire.
Tester lights up on hot wire.

Now test for neutral wire.
You know hot wire.
Test each hot wire to other wires (except bare ground)
Tester lights up on neutral.

If you do not have a tester, take ordinary wall lamp.
Plug on wall lamp has 2 prongs.
Prongs should have a hole.
Spread prongs apart.
Wrap bare copper wire into hole on prong1.
Turn on power.
Test prong2 to each wire.
Light comes on when prong2 touches hot wire

Nov 22, 2010 | Sperry Instruments HST401 Voltage...

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Do have a number to call? we need it to ask questions.

The HST401 is an older 'legacy' product. If you go to and select the support tab and then choose 'Legacy Product' you will see a list of products. Scroll down until you see your tester model number and click on 'Manual' and an operation manual will open in a separate window.

Mar 29, 2010 | Sperry Instruments HST401 Voltage...

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Just tested gfci receptacle with sperry gfci outlet tester and got all three (red,yellow,yellow) lights. What does this mean??

Your tester is defective then. All 3 lights should not light up. The correct wiring would be 2 yellow, no red.

Mar 01, 2010 | Sperry Instruments HST401 Voltage...

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Don't know how to use my Sperry outlet tester

Dec 15, 2009 | Sperry Instruments HST401 Voltage...

1 Answer

My digisnap DSA-500 has test leads for testing voltage but no way

erikgardner,The blunt ends have snug cover use your finger nails to separate the cover from the ends.

Nov 24, 2009 | Sperry Instruments HST401 Voltage...

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How does a Sperry HST401 ensure power is off to a ceiling fan?

if the light bulb is off, you don't have power at the lightsocket, sometimes those testers are too sensible, speceally cheap ones.
I have a Fluke and also get false hots but never a false dead.

Nov 23, 2009 | Sperry Instruments HST401 Voltage...

1 Answer

Checking batteries

I assume a "DM-350a" is some kind of a digital multimeter. I Googled and found it might be a "A.W. Sperry DM350A 5 Function 17 Range Digital Multimeter" and looking at the ranges available on that meter, you can't really thest the battery "under load" the only reasonable way to test small batteries. the DC current only goes up to 200 milli amperes. A "C" or "D" size flashlight battery puts out 1 to 4 amps depending on conditions. That's 5 to 20 times the current readable by that meter. The volts on one of those batteries is probably 1.6 volts to 1.3 volts etc. If you live in the United States, I'd say go to Radio Shack and spend $5 to $15 and buy a battery tester like "Enercell Analog 9-Range Battery Checker, $14.99, Model 22-156, catalog # 22-156"
Then you and anyone in your family can read the instructions and test 8 or 9 different type batteries. Battery types: 1.5V button-cells, "AAA"/"N"/"AA"/"C"/"D", 6V, 9V, 12V, 15V and 22.5V..
This is not supposed to be an advertizement, and I have no interest in RadioShack,... but it's supposed to be instructional.

Small price, Good instruction to anyone who can read, and if anyone forgets, they can re-read. Testing a lot of batteries in a sitting goes very fast with these.

Differently, with the sperry, or any voltmeter, you'd have to select a resistor small enough to draw the current, and large enough not to overheat or burn, connect it and measure the loaded voltage drop, compare the voltage and current of the loaded battery, and compare it to that of a new battery, and a battery you might consider too weak for your application.. Voltage equals amps times resistance, and power equals amps squared times resistance... Really, buy a battery tester.
Regards --- GooseBay_Camper

Sep 26, 2009 | Sperry Instruments HST401 Voltage...

1 Answer

Need an a.w. sperry dsa-7610a manual

It only came with a sheet of paper, operating instructions on each side.
I can scan and email you a copy - if you want one, please email your address to

ofgdad at (change the at to @)

Old Fat Guy

Apr 27, 2009 | Sperry Instruments HST401 Voltage...

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