Preparation for use – HT instruments HT204 User Manual
Page 5
HT204
EN - 4
2.3.3. W/B
key
By pressing
key the manual selection of measuring unit is possible. The cyclically
pressure of the key changes the measuring unit among W/m
2
and BTU/(ft
2
*h).
2.3.4. D-H
key
By pressing
key the measured value is frozen on the display where the symbol
"HOLD" appears. Press again D-H to disable this function and resume normal operation.
2.3.5. R
key
By pressing
key the manual selection of measured range cyclically pressure of the key
changes the measuring range and fix the decimal point on the display.
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 batteries (refer to paragraph 6.1.1 for further details on
model, number and battery life). The battery charge is displayed on the right top side.
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.