Sper Scientific 840021 Light Meter Foot Candle - Manual (Page 5)

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4. ZERO ADJUSTMENT & CALIBRATION
• With the sensor cover securely in place and the meter turned on, the
LCD display should indicate "000" or "00.0" depending on the selected
range.
• A slight variation will not affect readings; however, if a precise reading
is required you may use the ZERO SETTING (7) terminal to reset the
unit.
• To make an adjustment, press the 200 RANGE (5) button and cover
the PHOTO SENSOR (11).
• Using a small screwdriver, turn the ZERO SETTING (7) terminal until
"00.0" appears on the LCD.
• To maintain accuracy, annual laboratory calibration is recommended.
For calibration service, contact SPER SCIENTIFIC, 7720 E Redfield
Rd, Suite 7, Scottsdale, AZ 85260, USA. Ph 480-948-4448,
[email protected].
5. BATTERY REPLACEMENT
• Replace the battery when the low battery icon is displayed in
the left corner of LCD.
• In-spec measurements may be made for several hours after the low
battery indicator appears.
• Remove the BATTERY COMPARTMENT (10) screw and slide the
cover away from the meter, remove the battery and replace with a 9V
battery (alkaline or heavy duty type).
• Replace the cover.
6. OPTIONAL ACCESSORIES
•
840090 Water Resistant Instrument Pouch
• 840092 Bench-Top Tripod
• 840093 Field Tripod
IMPORTANT: During adjustment, be sure to use only the terminal marked
"ZERO." The unmarked terminals are for professional laboratory calibra-
tion only. Tampering with the unmarked terminals will result in inaccurate
readings and require professional calibration of the meter.