Option -01 Battery Pack
Introduction
7
7-3
7-1. Introduction
The Fluke 45-01K Battery Kit is a field installable option that may be installed in the
meter. The installation of the Battery Kit facilitates portable operation of the meter for
typically eight hours.
7-2. Specifications
Specifications for the Battery Kit Option are as follows:
• Type of Cell: Sealed Lead-Acid Rechargeable
• Battery Voltage: 8 Volts Nominal
• Charge Time: 16 Hours Typical w/meter off
7-3. Theory of Operation
7-4. Functional Block Description
The Battery Pack Option PCA consists of the five functional blocks illustrated in Figure
7-1. Each block is described below:
• Switching Power Supply
The Switching Power Supply regulates the 7.5 V-to-35 V raw dc input provided by
the main circuit board (J1-7). The supply output (9.3 V to 9.8 V, temperature-
compensated) is used to charge the 8 V lead-acid battery.
• Cycle/Float Charge Rate Switch
The Cycle/Float Charge Rate Switch monitors the charging current required by the
battery pack and sets the output voltage accordingly (9.35 V for trickle charging, or
9.8 V for cyclic charging).
• Low Battery Indicator Detector
The Low Battery Indicator Detector monitors the battery pack voltage, outputting a
logic low to turn on the meter low voltage indicator when the battery pack voltage is
below approximately 7.7 V.
• Low Battery Disconnect
The Low Battery Disconnect circuit interrupts meter loading on the battery pack
when battery pack voltage drops below approximately 7.0 V. This action prevents
deep discharge of the batteries.
• Constant Voltage Trickle Charger.
When the meter is operated on line power, the charge on the battery pack is
maintained with the Constant Voltage Trickle Charger (9.25 V output).
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