5-23
Table 5-3.—Front-Panel Controls and Connectors
NO.
NAME
DESCRIPTION
1
HORIZ control
When adjusted this controls the horizontal position of the CRT display.
2
VERT control
When adjusted, this controls the vertical position of the CRT display.
3
POWER on/off and
INTENSITY control switch
When this is rotated clockwise, the power is turned on. Further adjustment
of the switch controls the intensity of the CRT display. When it is rotated
fully counterclockwise, the power is turned off.
4
TRACE ROTATE control
When adjusted, this controls the trace rotation of the CRT.
5
CRT display
This displays the signatures produced by the unit.
6
RANGE selectors
These are push buttons that are used to select one of four impedance
ranges: LOW, MEDIUM 1, MEDIUM 2, and HIGH.
7
AUTO selector
This push button, when selected, initiates automatic scanning of the four
ranges from low to high. The speed of the scanning is determined by the
RATE control (item 14)
8
CHANNEL A selector
This push button, when selected, causes channel A to be displayed on the
CRT.
9
CHANNEL A test plug
This is a fused test lead connector that is active when channel A is selected.
All test lead connectors accept standard banana plugs.
10
ALT selector
When selected, this push button causes the unit to alternate between
channel A and channel B. The speed of this is determined by the RATE
control (item 14).
11
COM test plug
This test lead connector is the instrument common to and the common
reference point for channel A and channel B.
12
CHANNEL B selector
This push button, when selected, causes channel B to be displayed on the
CRT.
13
CHANNEL B test plug
This is a fused test lead connector that is active when channel B is selected.
14
RATE control
This controls the channel alteration and/or the range scanning.
15
G1 and G2 plugs
These are used for the pulse generator output test leads.
16
WIDTH control
This controls the duty cycle of the pulse generator.
17
LEVEL control
This controls the amplitude of the internal pulse generator.
18
PULSE GENERATOR
selectors
These push buttons are used to select the output modes of the pulse
generator: positive (+), negative (–) or PULSE/DC.
19
FREQUENCY selectors
These push buttons are used to select one of the three test signal
frequencies: 50/60 Hz, 400 Hz, 2000 Hz.
Cathode-Ray Tube (CRT) Display
The CRT display (figure 5-19) is used to view the signature of the component under test. The display
has a graticule consisting of a horizontal and vertical axes. The horizontal axis is used to represent voltage
with the vertical axis being used to represent current. The axes divide the display into four quadrants.
Each quadrant displays a different portion of the signature for the component under test.
