Test mode – Videoswitch VT User Manual
Page 20
VT Series 2
User Manual
Page 20
Videoswitch
VT601c.doc
9.
Test Mode
The transmitter has a special test mode which allows the calibration of the joystick to be checked and also
permits the lens offset voltages of the receivers to be adjusted. This mode should only be used with great
care.
To enter test mode, turn on the transmitter while holding on the LAMP, ALARMS, WIPE and
AUTOPAN keys.
Exit test mode as soon as test mode operations have been complete. To exit, turn off the unit for 5
seconds, then turn on again.
9.1 Joystick Calibration Check
When in test mode, the eight preset LEDs are used to indicate the readings obtained from the joystick. The
pattern of LEDs should be seen:
Joystick central :
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Joystick pushed fully left or right:
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
Joystick pushed fully up or down:
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
9.2 Lens Offset Adjust
Good access to the receiver is necessary to perform this operation. When in test mode, the lens offset
voltages can be increased or decreased by monitoring the each voltage in turn with a voltmeter and
pressing:
[SET], [WIPE], [AUTOPAN] and [ZOOM
↑
, IRIS
↑
or FOCUS
↑
]
or
[SET], [WIPE] , [AUTOPAN] and [ZOOM
↓
, IRIS
↓
or FOCUS
↓
]
The voltages should be set to as close to zero as possible (to avoid lens creep). Note that there should be
no need in normal use of the receiver to ever perform this operation as offsets are factory set during
manufacture.