Series 8035XA Peak Power Sensors
6-2
Manual 21568, Rev. F, March 2008
5.1.2
Zero Adjustment
1.
This test requires that no RF is present, and that the instrument is in the CW mode. Be sure
that the system is allowed to warm up at least 30 minutes. The measurement should be
made quickly to prevent cooling of the circuit. Refer to Figure 5-10.
2.
Remove the cover of the sensor and connect a dc millivolt meter between TP11 (Common)
and TP12 (High) on the Analog Board.
3.
Adjust R33 (OFFSET ADJ) for 0.00 Vdc ±100 mV.
4.
Replace the cover and calibrate the sensor.
Figure 5-10: Principal Test Component Locations
5.2
Troubleshooting
Refer to the Analog and Digital PC Board schematics on pages 7-12 and 7-15, the block
diagrams on pages 3-3 and 3-5, and the timing diagrams on pages 3-4, 3-7, and 3-8 for
assistance in performing the following procedures.
Use a pulsed 1 GHz waveform of about 0 dBm for troubleshooting to trace the signal through
the sensor. The waveform should have a rep rate of about 1 kHz, pulse width about 100
µ
s to
start, INT trigger at -20 dBm, and delay = 0.
At times it may be required to carefully check voltages at IC pins. Since the PC boards are
surface mount, careless probing can: short two pins, break leads, damage boards and, in
extreme cases, cause the components to break away from the board taking pads and traces
with them.
CAUTION
Static sensitive components. Use proper techniques including,
but not limited to, wrist straps, anti-static mats, tools, soldering
irons, desoldering tools, and proper non-static clothing.
The most common cause of failure is the application of too much power (more than +23 dBm)
which destroys the diode element. This will most likely manifest itself as a non-successful
completion of the sensor calibration routine. (See Chapter 2). Verifying that another sensor will
calibrate successfully will isolate the fault to the peak power sensor and not the instrument.
Содержание 80350A
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