Operating Basics
Refer to the section describing the “Initial Operation and Testing” for initial preparation to put
your
VMM-D1
or
VMM-T1
into operation.
Function Switches
Located at the Rear Panel and labeled “Function” are five miniature slide switches. Switches
A –
D
allow the user to select the active state of the four BNC inputs. When the switch actuators are
selected to the down position (a small hole will be visible just above the switch’s actuator, this
actuator could be either black or red), the corresponding BNC input will be TTL active low. This
indicates that a logic “0” (0 volts) will activate the selected input.
The switches must be in this
(the active low) position to activate the inputs from a remote activate cable such as the
710R
(handheld) or the 710R/F (foot activated).
By sliding any of these switch actuators to the up position (covering the small hole), the
selected BNC input will become TTL active high.
This indicates that a logic “1” (+5 volts) will
activate the selected input.
Switch
E
selects HIGH/LOW pulse energy. HIGH energy is required to operate the VS35
(35mm aperture) and the VS45 (45mm aperture) shutters. When the switch is in the down
position (a small hole will be visible just above the switch’s actuator, this actuator could be
either black or red), the pulse energy is selected LOW. When the switch actuator is in the up
position (covering the small hole), the pulse energy is selected HIGH.
THE HIGH ENERGY
SETTING MUST BE USED FOR ONLY THE VS35 AND VS45 TYPE SHUTTERS.
USE THE
POSITION FOR ALL OTHER
UNIBLITZ
SHUTTERS. USE OF THE
POSITION FOR SHUTTER APERTURES SMALLER THAN THE VS35 AND
VS45 COULD CAUSE IRREPARABLE DAMAGE TO THE SHUTTER USED AND
WILL VOID THE SHUTTER’S LIMITED WARRANTY.
LOW
HIGH
GATE INPUT
The GATE INPUT is used in conjunction with the TRIGGER INPUT. This input allows the user to
“pick” one or a finite number of trigger pulses to trigger the controller from a continuous stream of
pulses presented at the TRIGGER INPUT.
See Figure #5. The following description assumes the
GATE INPUT is selected active high (function switch ”D” up position) and the TRIGGER INPUT is
selected to the active low state (function switch “A” down position).
When a stream of trigger pulses is
input to the TRIGGER INPUT and the GATE INPUT is in the high state (TTL logic “1”, +5V), the
trigger signals will operate the
VMM-D1
and the
VMM-T1
as described in the “OPERATOR
CONTROLS” section. Once the GATE INPUT changes to the low state (TTL logic “0”, 0V), all
trigger signals being sent to the TRIGGER INPUT are disabled. A single TTL high pulse presented to
the GATE INPUT, equal to the trigger period, will allow one trigger signal from the trigger stream to be
enabled. (See Figure #5A.) If a single TTL high pulse presented to the GATE INPUT is equal to twice
the trigger period, two trigger signals from the trigger stream are enabled. (See Figure #5B.)
Therefore, the number of trigger pulses input (or GATE INPUT duration) is equal to the trigger period
times the number of exposures desired. Either the
VMM-D1
or the
VMM-T1
controller will utilize the
GATE input in the same manner.
Note
,
the
VMM-T1
TRIGGER INPUT triggers the internal timers;
the
VMM-D1
TRIGGER INPUT opens the shutter with the first pulse presented to the input and closes
the shutter on the subsequent pulse (this input functions as the D122 PULSE O/C input).
VMM-D1 & VMM-T1 User Manual
25
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