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≈2.1a
a. If board E4400-60155, 60141 or 60038 then Abus ≈ 3.
≈−1.8 −0.22
tob
−0.05
b. If board E4400-60038 then Abus ≈ 1.2.
0.0 −0.52
toc
0.3
c. If Option UNB then Abus ≈ 0.8.
PRESET; 0 dBm; RF Off; No Modulation ≈0.7 ≈0≈2.1d
d. If board E4400-60038 then Abus ≈ 5.0.
If board E4400-60155 or 60141 then Abus ≈ 3.
≈−1.8 −0.22
tob
−0.05
0.0 ≈ −0.52
toc
0.3
PRESET; 20 dBm; RF On (Unleveled) ≈0.7 ≈0≈2.1a≈−1.8 −0.3 tob
−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≈2e
e. If board E4400-60155 or 60141 then Abus ≈ 4.
≈−3≈−0.04b0.0 −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 ≈2f
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≈2.1a≈−1.8 ≈ −0.2 0.0 ≈0.9g
g. If Option UNB then Abus ≈ 1.4.