Agilent N5161A/62A/81A/82A/83A MXG Signal Generators Service Guide
Troubleshooting
Amplitude Modulation Problems (N5183A)
1-50
b. Go to Chapter 4, "Post-Repair Procedures and Performance Verification".
• If the measured voltages decrease by approximately 1V for each 10 dBm reduction in power level, as shown in the Example
Voltages column in the table, verify the continuity of the W14 modulator drive cable (see Figure 1-19 on page 49) to the A3 RF
assembly.
— If the cable is bad, replace the cable.
— If the cable is good, replace the RF assembly.
12. Go to Chapter 4, "Post-Repair Procedures and Performance Verification".
Amplitude Modulation Problems (N5183A)
1. Remove the external cover and the top inside cover. Refer to Chapter 3, "Assembly Replacement" for instructions on removing the
instrument covers.
2. Set up the signal generator:
a. Press
Preset.
b. Press
FREQ > 5 > GHz.
c. Press
RF On/Off to On.
d. Press
AMPTD > 0 > dBm.
e. Press
AM > AM Off On to On.
f. Press
AM Type LIN EXP to EXP.
g. Press
AM Depth > 40 > dB.
h. Press
AM Rate > 400 > Hz.
Figure 1-20 ALC J1-E3
3. Using an oscilloscope, measure ALC J1-E3 (Figure 1-20).
NOTE There is no “J1” label on this side of the circuit board.
You should see a sine wave with an amplitude > 2.5 Vp–p and a period of 2.5 ms.
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