Owner manual
Table Of Contents
- Parts List
- Specifications
- Basic Functions
- How You Will Use the Model 725
- Installing timerPRO Software
- Setting Up the Model 725
- Field Upgradeable Software
- Getting Help
- Back Panel Inputs and Outputs
- Front Panel Controls
- Main Screen
- General Settings
- Channel Properties Screen
- Quiescent States
- Logic
- Timing Modes
- “Apply” versus “Program All Channels”
- Fixed Output Mode
- Passive Mode (Output = Input)
- Clocked Pulse Stream Mode
- Delayed Pulse After Trigger Mode
- Important Delay Timing Considerations
- Validated Trigger Input Mode (Noise Suppression)
- Timer Mode
- Dynamically-Delayed Pulse Mode
- Toggled Output Mode
- Dynamic Delay Compensation Mode
- Storing and Recalling Experiment Files
- Front Panel Controls and Indicators
- Selecting a Channel from the Front Panel
- Performing a Front Panel Function
- Store/Recall Settings Profiles
36
Important Delay Timing Considerations
Once the Model 725 has begun a delay sequence, it ignores incoming trigger pulses. There is also
a delay of approximately 10 μs after the completion of a delay sequence while the channel resets
for the next trigger. This effect can be used to skip triggers, but if misunderstood it can cause
unexpected results.
For example, in the diagram below, two trigger pulses arrive 100 μs apart. The channel is
functioning in Delayed Pulse Mode, with a delay of 50 μs and a duration of 45 μs pulse. It would:
receive the first pulse; wait 50 μs; send a 45 μs output pulse; and trigger again at the second pulse.
But the extra 10 μs delay at the end of the sequence will cause the channel to ignore the second
trigger pulse.
t=50 μs
output
pulse sent
t=100 μs second trigger pulse
t=0 μs first trigger pulse
t=105 μs channel ready
for next trigger pulse
t=95 μs delay
sequence ends