Manual 21568, Rev. F, March 2008
5.1
Introduction
There is no regularly scheduled maintenance required for the Peak Power Sensors. Utilize the
normal operation calibration procedure in Chapter 2, Section 2.2 to ensure that the sensor is
operating within its specified linearity.
It is recommended that the sensor rise-time, overshoot, and zero be calibrated at 6-month
intervals as follows:
5.1.1
Rise-Time Adjustments
It is important that the rise time of the RF pulse be fast (about 10 ns), and without overshoot.
Care is necessary to get repeatable results.
Connect the test setup as shown in Figure 4-8 of the Performance Verification Test procedure.
Set the pulse generator for a 5 kHz pulse repetition frequency. Set the RF source to make a 2
µ
s wide pulse. Set the 8541/2 to display power in mW. Set the source to a fixed frequency at a
power level near 10 dBm. Set the RF frequency to 50 MHz.
1.
Set the delay of the pulse generator to 0 ns. Set the Peak Power Sensor to the delay triggered
mode by pressing
[MENU] (step to) [PEAK SNSR SETUP] [ENTER] [A] (or B) [ENTER] [EXT] [1.7] [ENTER] (Set
Delay to 1
µ
s) [ENTER] (Set Delay Offset to 0.00) [ENTER]
2.
The 8541/2 will read the settled power of the pulse, approximately 10 mW.
3.
Press [REL].
4.
Increase the delay of the pulse generator to 900 ns. Vary the delay until the maximum power is
found. Subtract 100% from this number to calculate the overshoot.
5.
Increase the delay of the pulse generator until the reading drops to 90
±
1%. Note this time.
6.
Increase the delay of the pulse generator until the reading drops to 10
±
1%. Note this time.
7.
Subtract the time noted in Step 4 from the time noted in Step 5. The result is the 10% to 90%
power rise time.
8.
C3, C59 and C63 are factory select components chosen for optimum rise-time, fall-time, and
overshoot. If it is necessary to change these parts, C59 and C63 should have the same value. The
detector out signal on the oscilloscope will indicate the direction of change in the rise time and
overshoot, but is not suitable for quantitative measurements. For best results, profile the pulse
by stepping the measurements using small (about 10 ns or less) delay increments.
Maintenance
5
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