ESG Family Signal Generators Assembly-Level Troubleshooting with Block Diagrams
A12 Synthesizer/Doubler ABUS Nodes (ESG-A & ESG-D Series)
Service Guide 2-37

A12 Synthesizer/Doubler ABUS Nodes (ESG-A & ESG-D

Series)

NOTE The node voltages given in the following table are approximate values based
on a sample of signal generators. Your signal generator may not reflect these
exact values. Additionally, the resolution of these values varies from node to
node. As a guideline, interpret your measurements based on the number of
decimal places shown for the expected voltage.
A12 Synthesizer/Doubler ABUS Nodes
Test Conditions
Node Voltages (Corrected Values in Vdc)
F2
RF_OUT
TUNE
LOOP
10V
FM
PRESET; Freq 500.000001 MHz;
No Modulation ≈4−0.4 to
−0.7 3.0 to 4.8 ≈−0.6 9.9 to
10.1 < 0.2
PRESET; Freq 750 MHz; No Modulation ≈5.5 −0.4 to
−0.7 10.2 to
12.8 ≈−1.5 9.9 to
10.1 < 0.2
PRESET; Freq 1000 MHz; No Modulation ≈7.2 −0.4 to
−0.7 17.7 to
23.2 ≈−5.5 9.9 to
10.1 < 0.2
+1 Vdc Applied to EXT 1 INPUT:
PRESET; FM On; FM Source Ext 1 DC ≈−2.0
+1 Vdc Applied to EXT 1 INPUT:
PRESET; Freq < 250 MHz; FM On; FM
Source Ext 1 DC
≈−2.0