CRT FRONT PANEL CONTROLS DESCRIPTION INTENSITY Adjusts the brightness of the CRT display. FOCUS & ASTIGMATISM Adjusts the clarity of the CRT from wide or thick trace to narrow or fine trace/wave pattern. VERTICAL SHIFT Adjusts the position of trace/wave pattern in up and down movement. HORIZONTAL SHIFT Adjusts the position of trace/wave pattern in left-to-right movement. SWEEP Adjusts the Time base of the wave pattern. The waveform pattern can be contracted and expanded along the horizontal or time axis. TRACE ROTATION Adjusts the Trace line in parallel with the horizontal line of the Graticule. CRT Volts/Divison Determines the scale factor for reading the test voltage on the CRT display. Surge Test Voltage applied = No. of Vertical divisons (X) VOLTS/DIV selected. For eg:- No. of divisons travesed by Surge test wave = 4 VOLTS/DIV Selected = 500V/DIV SURGE TEST VOLTAGE APPLIED = 4 X 500 = 1000 Volts SET TEST VOLTAGE This control when rotated clockwise will adjust the output test voltage from 0 to 100% of the equipment's maximum rated output Test voltage capacity. TEST SELECT SWITCH This Test Select switch determines which of the test leads are HOT or ENERGIZED and which are at Ground potential. NOTE: The Windings connected to the corresponding Test leads will be compared with each other and resultant wavepattern will be displayed on the CRT. TEST LEADS TEST POSITION RED YELLOW BLUE BLACK A (3φ) HOT HOT GND GND B (3φ) HOT GND HOT GND C (3φ) GND HOT HOT GND 1φ HOT GND HOT GND SENSITIVITY KNOB This control is only available with Automatic Surge Tester with Go/No-Go test. This control helps in setting up the % variation difference wrt to Master winding. NOTE: The sensitivity should be kept at 0-50 for Fan stators and around 0-70 for fridge stators.