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ESG Family Signal Generators Assembly-Level Troubleshooting with Block Diagrams
A9 Output ABUS Nodes (ESG-A Series)
Service Guide 2-19
A9 Output ABUS Nodes (ESG-A 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.
A9 Output ABUS Nodes (ESG-A Series) (1 of 2)
Test Conditions
Node Voltages (Corrected Values in Vdc)
ALC_MOD
BURST_MOD
ALC_DET
POW_REF_1
POW_REF_2
LOOP_INT
PTAT
PRESET; 0 dBm; RF On; No Modulation
≈ 0.7
a
a. If board E4400-60038 then Abus ≈ 0.3.
If board E4400-60141 then Abus ≈ 1.3.
≈ 19 −0.23 to
−0.02
≈5
b
b. If Option UNB then Abus ≈ 3.9.
≈ 5
c
c. If Option UNB then Abus ≈ 4.2.
0.3 to
1.7
≈ 8.5 to
9.9
PRESET; 0 dBm; RF Off; No Modulation
≈ 0.1
d
d. If board E4400-60141 then Abus ≈ 1.3.
≈ 19 0.0
≈5
b
≈ 5
c
≈−10 ≈ 8.5 to
9.9
PRESET; 20 dBm; RF On (Unleveled) ≈ 20 ≈ 19 ≈ −0.5 ≈ 2.3 ≈ 4.1 ≈ 12 ≈ 8.5 to
9.9
Frequency Set to heterodyne Band;
PRESET; Freq ≤ 249.9 MHz; 0 dBm;
RF On; No Modulation
≈ 0.2 to
0.5
≈ 19 4.1 to
4.8
≈ 4.3 to
5.0
≈ 4.3 to
5.0
≈ 0.0 ≈ 8.5 to
9.9
+5.0 Vdc applied to Q INPUT:
PRESET; 0 dBm; RF On; I/Q On; I/Q
Source EXT I/Q; I Input = No Connection;
Burst Envelope On; If −0.5Vdc is applied
to Q INPUT, the Q node changes to
negative voltage
≈ 0.6
(20 w/
no Q
Input)
≈ 4.8 to
5.6
≈−0.08
to −0.2
(≈ 0.1
w/ no Q
Input)
≈ 4.5
b
≈ 4.8
c
≈−0.2
to 0.6
(≈ 12 w/
no Q
Input)
≈ 8.5 to
9.9
+1 Vdc Applied to EXT 1 INPUT:
PRESET; 0 dBm; RF On; AM On;
AM Depth 100%; AM Source Ext 1 DC
≈ 1 ≈ 19 ≈ 0
≈ 4.6
b
≈ 4.8
c
≈ 8.5 to
9.9