Hitachi KP-F1, Technical Operation Manual

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14. Field on demand function
Field on demand refers to a function for picking up rapidly moving objects by applying a trigger
pulse input at a desired timing to provide a desired or a fixed exposure time. The function is
effective since the object is always taken at the same position in the picture. The camera is
provided with four modes. Simultaneous odd and even field output and frame output can be
produced for each of these modes. However, one image output is obtained per trigger. This
function is unavailable in the 2N mode.
Field-on-Demand Function Table
Trigger
Mode
Camera Switch
Setting
Signal
Setting
Video 1
Output Signal
Video 2
Output Signal
One
Trigger
SW1: ON
SW2: 11110000
SW3: OFF 2I
2N
1N
OK: VS signal 1/60s
NG: No signal (*1) 1/60s
OK: VS signal 1/30s OK: VS signal 1/60s
NG: No signal (*1) 1/60s
NG: S signal 1/30s
Two
Trigger
SW1: ON
SW2: 11011000
SW3: OFF 2I
2N
1N
OK: VS signal 1/60s
NG: No signal (*1) 1/60s
OK: VS signal 1/30s OK: VS signal 1/60s
NG: No signal (*1) 1/60s
NG: S signal 1/30s
Fixed
Shutter
SW1: ON
SW2: 00000000
SW3: OFF 2I
2N
1N
OK: V signal 1/60s
NG: VS signal (*2) 1/60s
OK: V signal 1/30s OK: V signal 1/60s
NG: VS signal (*2) 1/60s
NG: No signal 1/30s
Sync
Non-
Reset
SW1: OFF
SW2: 01000010
SW3: ON 2I
2N
1N
OK: VS signal 1/60s
NG: VS signal (*3) 1/60s
OK: VS signal 1/30s OK: VS signal 1/60s
NG: VS signal (*3) 1/60s
NG: S signal 1/30s
(*1) Output Signal is 0 Volts DC
(*2) Output Signal has composite sync and black pedestal
(*3) Output Signal is not synchronized with external sync
Example of DIP switch, SW2 setting:
SW2: 01000010
One trigger mode
At a single trigger pulse input (Trig-A), exposure starts at the pulse rising edge and ends at the pulse
falling edge. The vertical sync is reset and the video output is obtained immediately.
The pulse width equals the exposure time.