Agilent Technologies 16760A manual To set pod threshold voltages

Chapter 2: Probing and Selecting the Sampling Mode

Formatting Labels for Logic Analyzer Probes

Capturing Data on 17 Channels in State Mode

On a single-card 16760A logic analyzer in the state (synchronous) sampling mode, you can assign pod 2 to the logic analyzer and unassign pod 1. (One pod must be unassigned in order to store time tags.) Even though pod 1 is unassigned, its J clock input is still used as the sampling clock input. This allows the 16 channels and the K clock input on pod 2 to be used as data sampling channels. This lets you capture data on high-speed buses that have 17 data bits, and a clock.

When you assign pods this way, the logic analyzer loses its ability to detect, to prevent triggering or sequencing on, and to remove an initial spurious sample in the acquisition (which can occur if the logic analyzer measurement is started before the state clock input signal starts toggling). However, because most high-speed devices have continuously running periodic clocks, the appearance of an initial spurious sample is unlikely.

When the K clock input is used as a data channel like this, it cannot be used as a qualifier signal for eye scan measurements (unless the data signal also happens to be the necessary clock qualification input for eye scan).

See Also	“To set up qualified eye scan measurements” on page 122
	“Selecting the State Mode (Synchronous Sampling)” on page 46

To set pod threshold voltages

The threshold voltage is the voltage level that a signal must cross before the logic analyzer recognizes a change in logic levels.

1.In the Format tab, select the threshold button located just below the pod name.

2.In the Pod threshold dialog, either:

•Select the Standard option; then, select one of the predefined threshold voltages from the drop-down list.

•Select the External Ref option. This option appears when the E5378A single-ended probe is used. It should be selected when the probe's threshold voltage reference inputs are used and are connected to the

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