CFM-88L 07/20/0930
APPENDIX A - BATTERY TEST PROCEDURE
Insufficient battery charge (entire set or individual cells) can cause the meter to display garbled messages or TOO HOT, TOO
COLD, RECHARGE or other messages. This garbled display usually is seen when the meter is just turned on and the supply
voltage drops so fast that the meter gets lost. The following tests should be performed before you call the manufacturer or
return the meter.
1. Check the battery charger transformer. The output should be 24 to 30 volts AC. Be sure the charger is plugged into
a live outlet. The green LED on the front panel of the meter indicates when the battery charger is powered.
2. Does the meter function properly while the charger is attached and plugged-in? If so, a bad battery cell is likely. Allow
ten minutes for minimum charging to take effect before testing meter function.
3. Place the meter face down with the air connectors turned away from you. Remove the battery compartment cover by
unscrewing the eight small phillips head screws. Check the battery clips. Remove the batteries and re-spring the clips
to provide proper contact pressure with the ends of the batteries.
Be sure to reinstall the batteries in the proper orientation as shown in the compartment. Turn the meter on to see if
the problem display still exists. If the problem persists, test the positive (+) and negative (-) charging circuits as follows:
a. Measure the DC voltage of the upper half [positive(+) six cells] of the battery set by placing your DC voltmeter
common (ground) probe at the left center battery clip and the other probe at the upper right corner battery clip.
The voltage should be between 7.2 volts and 8.5 volts DC.
This voltage should rise when the charger is plugged in and should fall when the charger is unplugged.
b. If the voltage does not rise and fall with the changes in charger input, then the charging circuit in the meter is
not working and the meter must be returned to the factory for repair.
c. Test the lower half [negative (-) six cells] of the battery set in the same manner described above by placing the
voltmeter probes at the left center battery clip and at the lower right corner battery clip.
4. Check each battery cell voltage with the charger unplugged and with the meter turned on (if it will stay turned on).
Each cell should have a voltage of 1.1 to 1.3 volts. If you find one or two very low cells, they may be weak cells and
may need to be replaced. If most of the cells are less than 1.1 volts, it is possible that all are near the end of the
discharge cycle and just need to be recharged.
5. Replace weak or low capacity battery cells with rechargeable cells of the same capacity (mAh) as the existing cells.
If the same capacity cells are not available, replace all 12 cells with new batteries. See the Instruction Manual Section
14.0 METER MAINTENANCE.
6. If the problem is not corrected through these procedures, please return the meter to our factory for repair and
calibration services.
Shortridge Instruments, Inc.
7855 E. Redfield Road
Attn: Recalibration Department
Scottsdale, Arizona, USA 85260
Phone: (480) 991-6744 Fax: (480) 443-1267
www.shortridge.com
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