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ESG Family Signal Generators Assembly-Level Troubleshooting with Block Diagrams
A11 Reference ABUS Nodes (ESG-A & ESG-D Series)
Service Guide 2-29
A11 Reference 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.
A11 Reference ABUS Nodes (ESG-A & ESG-D Series)
Test Conditions
Node Voltages (Corrected Values in Vdc)
MOD1_OUT
MOD2_OUT
VTUNE
MOD1_PK
MOD2_PK
LIN_AM
1GHZ_DET
FM_MOD
PRESET; No Modulation 0.00 0.00 2 to 4 < 0.5 < 0.5 0.00 0.0 < 0.3
Frequency Set to Heterodyne Band:
PRESET; Freq ≤ 249.9 MHz;
No Modulation
2 to 4 > 0.15
+1 Vdc Applied to EXT 1 INPUT:
PRESET; FM On; FM Source Ext 1 DC
≈−1.9 0.00 2 to 4 < 0.5 < 0.5 0.0 ≈ 2.2
+1 Vdc Applied to EXT 2 INPUT:
PRESET; FM On; FM Source Ext 2 DC
≈ 0 0.00 2 to 4 ≈ 7.5 < 0.5 0.0 ≈0
1 Vpp @ 1 kHz Applied to EXT 1 INPUT:
PRESET; FM On; FM Source Ext 1 AC
≈−1.9 0.00 2 to 4 < 0.5 < 0.5 ≈ 2.0 0.0
1 Vpp @ 1 kHz Applied to EXT 2 INPUT:
PRESET; FM On; FM Source Ext 2 AC
≈ 0 0.00 2 to 4 ≈ 7.5 < 0.5 ≈ 0 0.0
+1 Vdc Applied to EXT 1 INPUT:
PRESET; AM On; AM Depth 100%;
AM Source Ext 1 DC
0.00 ≈−1.9 2 to 4 < 0.5 < 0.5 0.0 ≈ 2.2
+1 Vdc Applied to EXT 2 INPUT:
PRESET; AM On; AM Depth 100%;
AM Source Ext 2 DC
0.00 ≈ 0 2 to 4 < 0.5 ≈ 7.5 0.0 ≈ 0
1 Vpp @ 1 kHz Applied to EXT 1 INPUT:
PRESET; AM On; AM Depth 100%;
AM Source Ext 1 AC
0.00 ≈−1.9 2 to 4 < 0.5 < 0.5 ≈ 2.0 0.0
1 Vpp @ 1 kHz Applied to EXT 2 INPUT:
PRESET; AM On; AM Depth 100%;
AM Source Ext 2 AC
0.00 ≈ 0 2 to 4 < 0.5 ≈ 7.5 ≈ 0 0.0