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Azur Electronics

BATTERIES IN TEST EQUIPMENT
Batteries In Test Equipment includes all the various batteries used in my test equipment. Mostly these are all standard Alkaline 9V PP3 types used in portable test equipment such as Multi-Meters. These need changing usually on an annual basis.

More specialist rechargeable batteries are used in test equipment usually to power RAM to store settings or calibration data. These need the test equipment powering-up occasionally to charge the batteries.

 SPECIALIST BATTERIES 
Test
Equipment
Battery
Voltage

Battery
Type

Notes
Commodore PC40-III

3.0V Dallas DS1287 Real Time Clock IC
HP 3478A Multi-Meter 3.0V HP 1420-0278 RAM calibration
constants
HP 438A Power Meter

3.0V HP 1420-0314 RAM backup
HP 4951C Protocol Analyser

3.6V HP 1420-0264 RAM data and
setups
HP 8175A Digital Signal Generator 2.4V HP 1420-0251 RAM configuration
settings
HP 8657B Signal Generator 2.8V HP 1420-0281 RAM settings and
storage register
HP 8901B Modulation Analyser

2.8V HP 1420-0322 Non Volatile
Memory
LeCroy 9310 Dual 300MHz
Oscilloscope

3.0V Maxell ML 2032
T25
Real Time Clock
More detailed information on each specialist battery is provided on the individual test equipment's webpage.

Why did HP use so many different batteries?

 STANDARD BATTERIES 
Test
Equipment
Battery
Voltage

Battery
Type

Notes
Avometer 2001 9V 6F22 PP3
Avo 8 Mk 6 1.5V
15V
LR20 Size D
RS 591-821
 
Cason CA380
Infra-Red Thermometer
9V 6F22 PP3 Fit when required
DBU30
Sound Level Meter
9V 6F22 PP3 Fit when required
Honeytek A6243L
Inductance and Capacitance Meter
9V 6F22 PP3  
Megger BM100 9V 6F22 PP3  
Megger BM101 9V 6F22 PP3  
Megger LT7 1.5V x 4 LR6 AA  
RS V10860
Digital Light Meter
9V 6F22 PP3 Fit when required
SkyTronic 600.219
DMM
9V 6F22 PP3
Regular checks on battery condition is a good preventative maintenance measure. I have had test equipment damaged by leaking batteries, see HP 8170A Logic Pattern Generator scrapped because of leaking batteries damaging the PCB.

I put a small sticker on or near the battery with a date code, ie. 08/16 (August 2016) to indicate when the battery was last changed or tested.