Cablescan QS-200S, Instruction Manual

Page 4 

QS-200 Instruction Manual  

OPERATING INSTRUCTIONS 

INTRODUCTION 

This section covers instructions for using the QS-200S. 

FRONT AND REAR PANEL FEATURES 

A description of the front and rear panel features is provided earlier in the manual in the section Operating 
Controls & Indicators.  All controls, indicators, and connectors are identified and briefly described.  (See 
Figure 1.)   

BEFORE INITIAL POWER-ON 

Check the rear panel label to verify the instrument operating voltage.  Correct line voltage is 

very

important.   

The offset pin of the power cable is provided to ground the instrument when plugged into the appropriate 
receptacle.  (Satisfactory operation of the QS-200S requires the instrument to be grounded.) 

POWER-ON PROCEDURE & MODE SELECTION 

Selection of the instrument operating mode is accomplished by depressing either the SCAN, ANALYZE, 
or PRESELECT interlocked mode switches. 

SCAN MODE 

With the SCAN switch depressed, the QS-200S operates with a short dwell time.  If a single wire is 
contacted, the display will show the coded number corresponding to the wire contacted.  (The code is 
determined by the interface cable assembly connecting the wire network to the QS-200S).  Contacting 
multiple wires simultaneously, however, causes the numbers to be rapidly sequenced through.  This 
appears as a flickering of the numeric display. 

ANALYZE MODE 

The ANALYZE Mode is used when the identity of multiple wires (as indicated in SCAN) is to be 
determined.  Depressing the ANALYZE switch sets the instrument for this purpose.  A decimal-point 
light appears to the right of the display continuously to alert the operator that this mode has been selected.  
The identities of all wires contacted are now sequentially displayed on the LED readout.   

PRESELECT MODE  

The PRESELECT Mode is used to identify only one wire in a bundle.  When this mode is selected, only 
the wire preselected on the thumbwheel switch is displayed.  Whenever any other wire is probed, only the 
decimal point to the right of the hundreds digit will flash.  If the preselected wire is probed in addition to 
any other wires, the decimal point will flash in addition to the preselected number on the display.  In 
addition, if the preselected wire is shorted to any other wire, the decimal point will flash.   

INTERFACE TO WIRE ASSEMBLY 

Four interface connectors are provided on the rear panel.  These furnish the inputs from the wire 
assembly.  The interface cables that connect the wire assembly to the QS-200S set the code; i.e., the 
number associated with any wire in the network.  The set of numbers provided are 1, 2, to 200.