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
45
Triggering
The triggering options are the same as those for Delayed Pulse After Triggering mode:
Normal The channel can retrigger an unlimited number of times
Skip N triggers The channel triggers only after the specified number of input pulses
(between 0 and 2,147,483,647).
Retrigger N times Limits the number of retriggers allowed between resets (between 0
and 2,147,483,647). To allow a channel to be triggered again after
reaching the limit, press the Reset button on the Model 725 or choose
Program > Reset Channels in timerPRO.
Trigger on rising input Sets the channel to be edge triggered. In other words, an input signal
that stays high triggers the channel only once.
Trigger on input high This option is not used in this mode.
Alert host computer Sends a “ping” to the PC upon completion of the trigger cycle.
following trigger
The front panel LED for a dynamically-delayed trigger will remain green until a valid input
signal is detected. When an input signal is detected, the LED will glow red until the output signal
is sent. At this point the LED will return to green if retriggering is allowed, or it will glow red to
indicate that no more input signals will be accepted.
To try the dynamically-delayed pulse mode:
You can simulate the experiment above using the external trigger button, connected via BNC to In
1, to represent Sensor 1, and a delayed pulse after trigger in Channel B to represent the signal
from Sensor 2. Connect your oscilloscope to Output C to view the results.
1. On the General Settings screen, select 100/64 (low-resolution) mode for Channels C and D
(and optionally for Channels A and B).
2. Click OK to save the change. A warning may appear listing channels for which the clock
range settings are invalid. Click OK to close the warning. The software will go into “offline”
mode allowing you to adjust the timing settings for the listed channels.
3. On Channel A’s Properties screen select Validated trigger input mode.
4. On Channel A’s Validate tab set the Minimum Duration of Valid Trigger to 10 ms to
debounce the switch. Set the Duration of Pulse to 30 µs.