HT instruments HT307 User Manual
Page 6
HT307
EN - 5
3. PREPARATION FOR USE
3.1. INITIAL
This instrument was checked both mechanically and electrically prior to shipment. All
possible cares and precautions were taken to let you receive the instrument in perfect
conditions. Notwithstanding we suggest you to check it rapidly (eventual damages may
have occurred during transport – if so please contact the local distributor from whom you
bought the item).
Make sure that all standard accessories mentioned in paragraph 6.3.1 are included.
Should you have to return back the instrument for any reason please follow the
instructions mentioned in paragraph 7.
3.2. POWER SUPPLY
The instrument is powered by 1 battery 9V 6LR61, included in the package. Battery life:
about 200 hours (carbon zinc.).
When the battery is low, the symbol " " appears on the display. Replace it immediately,
following the instructions given in paragraph 5.2.
3.3. CALIBRATION
The instrument complies with the technical specifications contained in this manual and
such compliance is guaranteed for 1 year.
The calibration interval for the photo detector varies according to the operating conditions,
but generally the sensitivity decreases in direct proportion to the product of luminous
intensity and operating time. In order to maintain the basic accuracy of the instrument, a
periodic recalibration is recommended.
3.4. STORAGE
After a period of storage in extreme environmental conditions exceeding the limits
mentioned in paragraph 6.2.1 let the instrument resume normal measuring conditions
before using it.