56-101-00901 Revision F
Page 7
CHAPTER 2: OPERATION
1. OPERATING CONTROLS
For Front panel switches and controls refer to Figure 3.
A. The ON / OFF switch (1) applies power for all functions.
B. The TEMP. ADJ. control knob (3), a ten-turn potentiometer permits exact adjustment of the
millivoltage generator for temperatures which are displayed on the LCD (2) as °C when the
FUNCTION switch (4) is in the INDICATOR TEST position.
C. The FUNCTION switch (4), a three-position rotary switch that permits selection of the three
principal test functions, RESISTANCE MEASURE, INDICATOR TEST and TEMP. MEASURE.
D. The PUSH TO MEASURE ACFT. LEAD RES. BLACK pushbutton (5), when depressed with test
leads connected to aircraft system and FUNCTION switch in RESISTANCE MEASURE position
produces a display of the resistance in the system.
E. The SHORT TEST LEADS AND PUSH TO SET SYSTEM RES. RED pushbutton (6), when
depressed with test leads shorted and the FUNCTION switch in the RESISTANCE MEASURE
position connects the SYSTEM RES. potentiometer for system resistance adjustment.
F. The RESISTANCE RANGE switch (7), a four-position rotary switch, permits selection of the
resistance range, 20Ω, 200Ω or 2MΩ - (0Ω system resistance) and BAT position for monitoring
the 45-volt battery.
G. The SYSTEM RES. control knob (8), a ten-turn potentiometer used to adjust system lead
resistance 2 to 25Ω, when test leads are shorted, and the red pushbutton is depressed.
Figure 3
TT1000A Front Panel Layout
