2-9
Assembly-Level Troubleshooting with Block Diagrams
A11 Reference Board
A11 Reference Board
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 Board Abus Nodes
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; Frequency 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