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AN257
TDR Soft Reset and Battery Charging
Written by Paul DeWinter for:
AEA Technology, Inc.
Abstract
If the TDR’s Soft Reset (ON + press ENTER 4-5 times) is used, it performs a number of
housekeeping routines to recover any program faults and then restores the factory default
settings to the TDR. However, in a number of TDRs the housekeep goes too far and will clear
or set to NONE or ALKALINE the BATTERY TYPE: setting in the Battery Menu. This will
inadvertently turn off the battery charger. The follow instructions are corrective steps the user
can employ to avoid the TDR not recharging properly.
General
The Battery Menu, along with other commonly used settings, can be quickly restored by
following any Soft Reset action immediately with recalling an INSTRUMENT SETUP. Saving
and recalling INSTRUMENT SETUPS are covered fully in the 20/20 TDR’s Operating Manual’s
Section 2, under the F4 Menu, MEMORY ACTION. The instructions contain in this Application
Note are somewhat abbreviated for experienced users.
Safety Precaution
Before following the instructions below open the battery compartment to ensure the 20/20 TDR
has NiMH or NiCd cell installed. Additionally, note the mAhr rating printed on the cells for
updating the Battery Menu in step 2 below. All the cells should be the same type and rating.
Any mix of alkaline cells and rechargeable cells, or NiMH and NiCd, or different mAhr ratings
could cause severe overheating or cell outgassing.
Instructions
Ensure the Battery Menu is set correctly
Steps
1. Press F2, then select BATTERY MENU.
2. Make the following settings using any
◄►
keys:
BATTERY SAVER: OFF or ON user’s choice.
BATTERY TYPE:
NICD NIMH (only choice that will enable the charger)
BATT. CAPACITY: 2500MAHR (factory supplied cells. If cells have be
changed check their mAhr rating on the cell and use that rating)
All the remaining items in this menu are status only and can not be changed
by the user.
