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 ≈0.7a
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.
≈5c
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 ≈0.1d
d. If board E4400-60141 then Abus ≈ 1.3.
≈19 0.0 ≈5
b≈5c≈−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)
≈4.5b≈4.8c≈−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≈4.6b≈4.8c≈8.5 to
9.9