Test Products International
tpi Model SAIT200 1kV DC Insulation Tester - Analog  Display

Analog Insulation Tester Applications

• Testing motor winding insulation resistance.

• Checking phase-to-ground insulation of shielded cables.

• Determining phase-to-phase insulation resistance of multi-conductor cables.

• Measuring insulation resistance of conductors to ground in metallic conduits, raceways and cable trays.

• Verifying the integrity of insulated bus-work.

• Locating defective lightning arresters.

Analog Insulation Tester Features

• Three switch-selectable output voltage ranges:         
  250 VDC, Scale 0 - 100 Megohms
  500 VDC, Scale 0 - 200 Megohms
  1000 VDC, Scale 0 - 400 Megohms
   

• Robust, new-style, dual-purpose case/housing. Separate carrying case not required.  Slide-apart hinges facilitate easy lid removal.
   
• Battery Powered - No cranking required.
   
• Test Button Lock for convenient timed tests including Acceptance Tests and Polarization Index.
   
• High-accuracy Taut Band Meter with mirrored scale that eliminates parallax error.
   
• Live circuit detector for safety.  Alerts operator if system to be tested is energized.
   

• Dual-Range Continuity Test Function for convenient check of motor winding resistance.
  0 - 2 Ohms
  0 - 20 Ohm

Analog Insulation Tester Included Accessories

• Detachable Instrument carrying strap.
   

• Lead pouch.
   

• One red test probe w/ slip-on insulated alligator clip and one black lead with large clip.

Optional leads - Available Soon - Catalog # A072 - $7.95

• Two 6' leads (1 - Red, 1 - Black) with large insulating boot and clip that will accommodate a 2/0 conductor, larger motor leads, and bus bars.

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There is a continuing debate as to whether insulation testers should have an analog or digital display.  I personally prefer the analog meter because of its quick response.  The current decay that occurs during the first few seconds of an insulation test is a very good initial indicator as to the quality of the insulation system.  This is true for hipots as well as megohmmeters. (On a megohmmeter this current decay will be seen as an increase in resistance with time.)

With a digital meter it is more difficult to see this initial current decay because of the up-date time of the display. A digital meter, however, is a little easier to interpret and a bit more rugged.  If you prefer a digital instrument check out the TPI SDIT300 unit. 

Elwood Gilliland, Kilowatt Classroom LLC

Available Application Notes on tpi - Test Products International
Analog and Digital Insulation Testers

Click article title or number below to view and download article in PDF Format.
or
Click Article Index to see a listing of all Instrument Application Notes.
 

Theory of DC insulation testing and instructions for using the TPI Analog and Digital Insulation Testers.

Other Ways To Contact Kilowatt Classroom, LLC.
 
 Phone/Fax 307-265-2665
 
 9267 Red Creek Road, Casper, WY 82601