Boonton 4500B Peak Power Meter - Manual (Page 343)

Boonton 4500B RF Peak Power Analyzer
Maintenance 7-11
Sensor Risetime Verification
The risetime test uses the internal calibrator and the automatic measuring (Text) mode of the
Model 4500B to measure the risetime of the sensor.
Before performing the sensor risetime verification procedure, photocopy Table 7-15 and use it to
record the measurement data. Attach the completed table to the Checklist. If cable lengths other
than 5 feet are used with the sensors, check the cable length specification in Chapter 1.
To measure sensor risetime:
1. Connect the peak power sensor cable to Channel 1 of the Model 4500B.
2. Connect the peak power sensor to the calibrator output.
3. Perform AutoCal, if required.
4. Press the Init system key to reset the instrument‘s settings to their default states (High Video
BW mode).
5. Set the calibrator to pulse mode by selecting Calibrator > Cal Mode > Pulse.
6. Turn the calibrator on by selecting Calibrator > Cal Output > On.
For each of the levels in Table 7-15:
7. Set the timebase to the value of the specified risetime for the sensor under test by selecting
Time > Timebase #.
8. Set the calibrator output level to the value listed in Table 7-15 by selecting Calibrator > Set
Level #.
9. Set the trigger level to the value listed in Table 7-15 by selecting Trig > Trig Level #.
10. Press the Text system key to change the operating mode to the text display.
11. Record the risetime reading in Table 7-15.
12. Repeat Steps 8 through 11 for each level listed in Table 7-15.
13. Select Low Video BW by pressing Chan > Extensions > Video BW > Low.
14. Repeat Steps 7 through 11 while in the Low Video BW mode.
15. To measure CH 2 risetime, repeat steps 1-14, substituting CH 2 for CH 1, and setting the
trigger source to CH2 internal by pressing Trig > Trig Source > CH 2 Int.