HP E42 manual Ratio Measurements, Operating Controls

Model 5328A

Operation

3–18. To set up a time interval measurement, the marker outputs may be monitored on an oscilloscope (see Figure 3-5) to indicate where the channels are triggering with relation to the time interval of interest. The GATE/MARKER OUT is high during the time interval being measured.

Figure 3-5.Monitoring Marker Outputs

3–19. In T.I. A-B and T.I. AVG A-B with the rear panel ARM switch OFF, the counter is armed by the run down of the SAMPLE RATE control. With the rear panel ARM switch ON, T.I. A-B and T.I. AVG A-B are armed by an event at the C input. For T.I. AVG A-B, only one arming signal is required per average measurement (i.e., the counter doesn’t need to be armed prior to each individual time interval in the time interval measurement).

3-20.RATIO MEASUREMENTS

3-21. For ratio measurements, the 5328A has wide bandwidth, good sensitivity, and complete signal conditioning of the Channel A, B, and C input amplifiers.

3–22. Two ratio functions are available: B/A and C/A. The ratio of the frequency at B (or C) to the frequency at A is measured for N counts of A where N is selected by the RESOLUTION switch. The resolution of the measurement improves with increasing N and is given by 1 part in B/A x N (or C/A x N). Since the range of A is 0-10 MHz while B is 0-100 MHz, the lower frequency is normally applied to the A input although there is no restriction that this be the case (i.e., ratios less than 1 may be measured). If B/A is greater than 1, the measurement reso- lution is better than switching the inputs for a ratio <1, provided the value of N remains the same.

3-23.OPERATING CONTROLS

3–24. All of the front and rear panel operating controls are shown and described in Figures 3-6 and 3-7.

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