Extron • RGB 118 & RGB 118 PLUS • User’s Manual
Operation
Page 2-5
Using the SRI (RGB 118 PLUS only)The SRI feature of the RGB 118 PLUS is used to determine the
approximate horizontal and vertical scan frequencies of video and
computer monitors. To use the SRI, hold the RGB 118 PLUS with
the feet against the face of the monitor and near the center of the
screen as shown in Figures 1 and 2 below.
To view the vertical scan frequency, hold the unit so the LCD
readout is on a vertical plane (red SRI button is in the uppermost
position) as shown in Figure 1. Wait until the green Vertical (V)
LED turns on, then push and hold the red SRI button in until a
readout is obtained.
To view the horizontal scan frequency, hold the RGB 118 PLUS so
the LCD readout is on a horizontal plane (normal viewing) as
shown in Figure 2. When the red Horizontal (H) LED turns on,
push and hold the red SRI button in until a readout is obtained.
Anti-static, anti-glare or EMI coatings on the face of the CRT may
prevent the RGB 118 PLUS SRI from displaying the monitor’s
scan frequencies properly. Should this occur, an alternate method
to obtain a readout is to set the RGB 118 PLUS on top and toward
the rear of the monitor as shown in Figures 3 and 4 below. To
view the vertical scan frequency using this method, set the RGB
118 PLUS as shown in Figure 3 with the red SRI button toward the
rear of the monitor. Press and hold the red SRI button in when the
green Vertical (V) LED turns on. To view the horizontal scan
frequency, set the RGB 118 PLUS on the monitor as shown in
Figure 4. When the red Horizontal (H) led turns on, press and hold
the red SRI button until a readout is obtained.
Red
SRI
Button
Checking monitor Horizontal Scan Rate using the RGB 118 PLUS SRI
Checking monitor Vertical Scan Rate using the RGB 118 PLUS SRI
Figure 2
Figure 1
Red
SRI
Button
Figure 4
Figure 3