BASEWEST
Operating & Maintenance Manual
Model TS-420 Test Set
Page 2 of 10
25-60-41
24 Jan 2002
1.0 General
This operating and maintenance instruction covers the BaseWest Model TS-420 test set -
a rechargeable, handheld instrument with a digital LCD readout designed specifically for
testing airline escape slide lighting systems and their components. The Model TS-420
comprises the following functions:
• Voltmeter with built-in load bank - This mode is used to test battery condition. A rotary
switch on the instrument panel allows the selection of closed circuit test under
selectable resistive loads as well as an open circuit (no load) test.
• Ammeter with integral power supply - This mode is used to verify the current draw of
the slide light harness through an internal regulated 5VDC power supply. Current
readings can be used to verify proper function of the light harness and, in some cases,
can be used as an indicator of a light-out condition. The ammeter function has a built-
in timer that allows hands-free, walk-around inspection and automatic instrument shut-
down after 20 seconds.
Slide manufacturer component maintenance manuals should be consulted to determine
appropriate test parameters and loads.
Figure 1. TS-420 Test Set with Charger