Model STT-4
Shorted Turns Tester for Bobbin Wound Coils

Fast, Easy Set-up and Use
Plug-In Test Probes
Go/No-Go Testing
Non-Contact/Non-Stress
LED and Audible Signals

The STT-4 Shorted Turns Tester offers a quick and easy means to detect shorted turns in bobbin coils. It is a non-stress and non-contact test. By placing a coil over the test probe, shorted turns will inductively couple with the probe field and load the STT-4 circuit. If there is no current path within the coil, there is no coupling.

The STT-4 is easy to set-up and to use. The tester can be used without coil standards in most cases, although sample loops of typical coil diameters and wire sizes are helpful for set-up. An analog panel meter is provided to help the operator determine the amount of coupling and to set the Go/No-Go limits.

On/Off and Limit Adjust are front panel controls. The limit adjust allows the user to set the trigger point for the No-Go Indicators. A Red and Green LED's and an Audio Buzzer provide signals for the operator. An optional relay output can be supplied for automated applications.

The STT-4 offers a sensitive and accurate test, yet it is a rugged and reliable instrument. It can detect a single shorted turn of wire as small as #55 AWG (.014 mm). In general, the test is independent of the number of turns in the coil. Because of the simplicity speed and reliability of its operation, the STT-4 can detect errors early in the coil assembly process and help to save work on bad parts.

Specifications
Dimensions:
2 3/4" H x 8 1/4" W x 9" D, Weight 4 lbs.
70 mm H x 210 mm W x 250 mm D, Weight 2 Kg.

Power:
3 Watts, 110 V/60 Hz or 220 V/50 Hz AC. (Specify)

Controls:
On/Off, Hi/Lo Sensitivity, Limit Adjust on Front Panel;
Zero, Volume Adjust on Rear Panel

Outputs:
Analog Panel Meter

Go/No-Go Indicators:
Red, Green LED's, 5 Khz Buzzer,
TTL signal or Relay closure are optional.