‘Peak’ Events
Launch Pulse: The first peak on the screen is the “launch pulse” which occurs where the 965DSP connects to the test leads (at a distance of 0 feet or meters). The distance to the cursor includes the five foot length of the test leads.
Open: A clean or partial open will show up as a peak on the screen. The “cleaner” the open, the taller the peak. A complete open will be the tallest peak (other than the launch pulse). You can not see events past a complete open.
Load Coil: A load coil looks very similar to an open. If you think there is a load coil on the pair, use the 965DSP Load Coil function (in the Toolbox) to verify its presence. You can not see events past a load coil.
‘Dip’ Events
Fault: A resistance fault will show as a dip on screen. The lower the value of resistance, the lower the dip.
Short: A short (or
Bridge Tap: A bridge tap will look like a resistance fault and an open. (A dip followed by a peak.) The distance between the two events is the length of the bridge tap. The start of a bridge tap looks like a resistance fault. Use the 965DSP Resistance function to measure the resistance on the pair. If there is no resistance, and you see a dip followed by a peak, you might suspect a bridge tap.
TDR Save
You can save only the active “Single Trace” TDR screen. First, select the TDR control parameters so the screen appears as desired. Press the [Save] key (camera icon). The 965DSP will display the Save Results screen as follows:
103
