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Assembly-Level Troubleshooting with Block Diagrams ESG Family Signal Generators
A9 Output ABUS Nodes (ESG-A Series)
2-20 Service Guide
A9 Output ABUS Nodes (ESG-A Series) (2 of 2)
Test Conditions
Node Voltages (Corrected Values in Vdc)
I
Q
PRE_LEVEL
QUAD
GAIN_DET
GND
REF_AM
PRESET; 0 dBm; RF On; No Modulation ≈ 0.7 ≈ 0
≈ 2.1
a
a. If board E4400-60155, 60141 or 60038 then Abus ≈ 3.
≈−1.8 −0.22
to
b
−0.05
b. If board E4400-60038 then Abus ≈ 1.2.
0.0 −0.52
to
c
0.3
c. If Option UNB then Abus ≈ 0.8.
PRESET; 0 dBm; RF Off; No Modulation ≈ 0.7 ≈ 0
≈ 2.1
d
d. If board E4400-60038 then Abus ≈ 5.0.
If board E4400-60155 or 60141 then Abus ≈ 3.
≈−1.8 −0.22
to
b
−0.05
0.0 ≈ −0.52
to
c
0.3
PRESET; 20 dBm; RF On (Unleveled) ≈ 0.7 ≈ 0
≈ 2.1
a
≈−1.8
−0.3 to
b
−0.19
0.0 ≈ 2.3
Frequency Set to heterodyne Band;
PRESET; Freq ≤ 249.9 MHz; 0 dBm;
RF On; No Modulation
≈ 0.44 ≈ 0
≈ 2
e
e. If board E4400-60155 or 60141 then Abus ≈ 4.
≈−3
≈−0.04
b
0.0 −0.1 to
0.6
+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
≈ 0.0 ≈ 1.1
≈ 2
f
f. If board E4400-60155 or 60141 then Abus ≈ 3.
≈−1.8 ≈ 0.6
(0.0 w/
no Q
Input)
0.0 0.2 to
0.9
+1 Vdc Applied to EXT 1 INPUT:
PRESET; 0 dBm; RF On; AM On;
AM Depth 100%; AM Source Ext 1 DC
≈ 0.7 ≈ 0
≈ 2.1
a
≈−1.8 ≈ −0.2 0.0
≈ 0.9
g
g. If Option UNB then Abus ≈ 1.4.