Series 8035XA Peak Power Sensors
6-4
Manual 21568, Rev. F, March 2008
5.2.1
Sensor Not Present
Note that this type of failure indication is usually caused by a bad cable or a faulty temperature
sensing thermistor (RT1).
With the sensor disconnected from the power meter, check the resistance from Digital board J1
pin 4 to ground. Is it about 10 k
Ω
?
No
A2RT1 bad.
(If A2RT1 must be replaced, be sure to install the new RT1 using heat sink
compound. RT1 should protrude 0.13" above the PC board.)
Yes
Cable bad.
5.2.2
Calibration
Calibration failures are generally caused by a damaged diode element. Ensure that the system
is in the CW mode. Steps 1 and 2 refer to the Analog board.
A1TP3, TP4, TP5, and TP6 should be checked for oscillation, especially if drifting occurs.
*
NOTE:
Over-score indicates a logic-NOT condition.
1.
Check for a signal present at MONITOR OUT or A1TP9. (Should be near 0 mV with no
signal input, and about +3 Vdc at +20 dBm.)
No
Check as appropriate, A1TP4, then A1TP5, or A1TP3, A1TP1, and
A1TP2. Replace as required (as isolated by test points and supply
tests) A1U3, A1U4, or A1U5.
Yes
Continue to Step 2.
2.
(A1TP9 OK) Check for toggling signal at J2 pins 4 and 5 (SAMP and SAMP). Toggling?
No
Continue to Step 3.
Yes
Check A1TP7, A1TP10, and the DC OFFSET adjustment (A1R33).
A1TP10 should be 0 with no signal input, and about 0.6 with +20 dBm.
See Zero Adjustment in Section 5.1.2.
3.
(SAMP not toggling) Refer to the Digital board. Check TRIG (A2TP14) Is it High?
No
A2U17, A2U8, A2CR4, or A2R35 bad
Yes
Continue to Step 4
4.
(TRIG high) A2TP1 toggling? (10 MHz CTR-CLK)
No
A2U13 (A2TP12), A2U9, or A2U3 bad
Yes
Continue to Step 5
Содержание 80350A
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