Keysight N8973B User Manual

316 Keysight NFA Series Noise Figure Analyzers Service Guide
Power Supply/Midplane Troubleshooting
A7 Midplane Assembly Troubleshooting
Voltage readings are referenced to ACOM (TP4). All ohmmeter
measurements were taken from the power supply test point to ACOM. Due
to capacitive effects, wait for the ohmmeter readings to stabilize.
Table 10-3 A7 Midplane Board Test Points
Power
Supply
Test
Point
Description Expected
Voltmeter Reading
(VDC)
Power ON
Expected
Ohmmeter Reading
(KΩ)
Power OFF
+32A TP3 32 Volt Analog supply +32 ± 2.0 1.3 kΩ
+15A TP6 15 Volt Analog supply +15 ± 1.0 260 Ω
+15SB TP2 15 Volt Standby supply +15 ± 1.0 264 Ω
+12D TP16 12 Volt Digital supply +12 ± 1.0 264 Ω
+9A TP7 9 Volt Analog supply +9 ± 1.0 120 Ω
+5.2A TP5 5.2 Volt Analog supply +5.2 ± 0.75 3.6 kΩ
+5.1D TP15 5.1 Volt Digital supply +5.1 ± 0.75 40 Ω
+5.1SB TP17 5.1 Volt Standby +5.1 ± 0.75 228 Ω
+3.35D TP13 3.35 Volt Digital supply +3.35 ± 0.75 47 Ω
+3.3A TP10 3.3 Volt Analog supply +3.3 ± 0.75 36 Ω
-5.2A TP11 -5.2 Volt Analog supply -5.2 ± 0.75 1.9 Ω
-7A TP8 -7 Volt Analog supply -7 ± 1.0 445 Ω
-15A TP9 -15 Volt Analog supply -15 ± 1.0 390 Ω
n/a TP1 Fan Positive supply 8.5 to 13.5 VDC
~8.8 VDC @ 25C
490 Ω
n/a TP4 Analog Common n/a n/a
n/a TP14 Digital Common n/a n/a
n/a TP12 Power OK +3.9 ± 0.75 9.2 kΩ

Keysight N8973B Specifications

General

Brand	Keysight
Model	N8973B
Category	Measuring Instruments
Language	English