Keysight Technologies 34420A User Manual

5Service
140 Keysight 34420A Service Guide
Some circuits produce their own local power supplies derived from the main
supplies. Be sure to check that these local supplies are active.Local supplies are
included in the display and front panel, the input amplifier, and the input and
protection circuits. Always check that the power supplies are free of ac oscillations
using an oscilloscope.
Table 5-1 Main supply voltages
Power Supply Minimum Maximum Check At
+5 Ground Ref. 4.75 V 5.25V U751 pin 3
-5 Ground Ref. -5.25 V -4.75 V U611 pin 1
+5 Floating 4.75 V 5.25V U553 pin 2
+ 18 Floating 17.8 V 20.1V U551 pin 2
-18 Floating -20.1 V -18.2V U552 pin 3
+7 REF Floating 6.8 V 7.1 V U400 pin 7
+5VSP Floating 4.75V 5.25V U401 pin 7

Keysight Technologies 34420A Specifications

General

Brand	Keysight Technologies
Model	34420A
Category	Measuring Instruments
Language	English