Table of Contents
Advertisement
Theory of Operation
RF Vector Network Analyzer
Grounding and Power
N9923AN
Battery Related Information
Battery Description and Operation
The main battery is an SBS (Smart Battery System) compliant pack of lithium ion cells.
Refer to
"Battery Disposal" on page 1-7
for important information about replacing and
disposing of this battery.
The nominal voltage of the battery is 10.8 volts and normally varies from 9 to 12 volts.
The battery has built-in sensors, a processor, and control circuitry. This is referred to as
the Smart Battery circuitry.
The Smart Battery circuitry communicates battery condition and history information
digitally via a digital Smart Batt Bus. The Smart Battery circuitry is read-only.
Both the battery charging circuit and the System Monitor read battery information over
the Smart Batt Bus.
The battery temperature reported by the analyzer is based on a sensor inside the battery.
Temperature information is available over the Smart Batt Bus. The thermistor connection
(T) on the battery is not used.
The Smart Battery circuit may shut down the battery when the temperature is out of the
acceptable range or when the battery charge is too low.
See the "Working with the Lithium-Ion Battery" section of the N9923AN FieldFox RF
Vector Network Analyzer User's Guide (Part Number N9923-90006) for additional
information on:
• built in charge level gauge
• the battery information screen
• battery care
Battery Information Screen
Refer to the N9923AN FieldFox RF Vector Network Analyzer User's Guide (Part Number
N9923-90006) for information on how to access this screen.
Most of the items displayed on the screen come directly from the battery via the Smart
Batt Bus. Only the first three items are influenced by the analyzer.
Battery Charging Management
The battery pack determines when the battery needs charging and requests a charge over
the Smart Batt Bus.
The Battery Charger and Manager circuit on the A5 system board responds by charging
the battery if there is sufficient voltage on the Ext DC line. A minimum of approximately
15 volts is required to charge the battery.
The System Monitor on the A5 system board monitors the battery's temperature and, if too
high or too low, disables charging of the battery.
How to tell if the battery is charging:
5-16
Service Guide N9923-90005
Advertisement
Table of Contents
Troubleshooting
