Description – 3
R
EAR
P
ANEL
C
ONNECTIONS
..
Fig. 2. The VLM-40’s rear panel
provides video connections and a
termination switch for 75 ohms or
loop connection (Hi-Z).
A
BOUT
T
HIS
M
ANUAL
...
As shown in Fig. 2, the VLM-40’s rear panel is equipped with
BNC connectors for video and loop, and a switch for 75-ohm
termination or loop connection. An ac power cord provides
power to the unit from a standard 115 V ac receptacle.
The VLM-40 weighs less than two pounds, can be easily read
from a distance of 20 feet, and may be installed in an optional
panel mount (e.g., DORROUGH Rack Mount Kit, 40-S for a
single meter or 40-D for dual meters) or operated as a stand-
alone package.
The remainder of this Technical Instruction Manual is divided
into the following sections:
Installation
,
Operation
,
Calibration
,
and
Circuit Schematics
. Before you install the unit, take a
moment to read through the
Operation
chapter to fully
understand the capabilities of the VLM-40. After you have
determined how best to use the unit for your purposes, follow
the instructions listed in the
Installation
chapter.
VLM-40 NTSC T
ECHNICAL
I
NSTRUCTION
M
ANUAL
DESCRIPTION
AC Cord
DORROUGH ELECTRONICS
WOODLAND HILLS, CA 91364
Loop Through
Term.
Hi-Z
Gain
