Photometer 2 Instruction Manual
DLGelectronics.com
9
selected exposure setting and film speed. Display pointer to the right indicates brighter
whereas to the left indicates darker.
When either of the “HOLD” positions is selected, the corresponding stored value is
displayed. The HOLD functions memorise the brightness not the display
– the displayed
value is adjusted according to the settings of the exposure, range and film speed
settings.
EXPOSURE and RANGE control
Together these enable the exposure time to be selected. The maximum exposure is
approximately 1 hour at 125 ASA.
At very low light levels the meter can take some time to respond and settle to an
accurate reading. Avoid exposing the sensor to high brightness conditions immediately
prior to taking readings at very low light levels, as this slows the response.
Excessive humidity may limit the ability of the meter to read extremely low light levels, In
the event that this occurs keep the meter in a warm dry place for 24 hours and
performance will be recovered.
FILM SPEED
The film speed selection provides for a range of different film speeds from 32 ASA to
1600 ASA. For film speeds not in this range, allowance must be made or the exposure
settings adjusted accordingly.
HOLD buttons
Pressing either of the HOLD buttons memorises the current brightness in that storage
location irrespective of whether the INPUT control is in the ON, HOLD 1 or HOLD 2
positions.
The HOLD functions memorise the brightness not the display
– the displayed value is
adjusted according to the prevailing settings of the exposure, range and film speed
settings.
The memory is stored on capacitors in the meter and will therefore drift over a period of
time. The drift may be in either direction depending on the stored brightness. The
specified accuracy will be maintained for a minimum of one hour.
The HOLD functions do not memorise the brightness when the meter is turned off and
initialise on power-on in the region of 1 second exposure equivalent.
BATT TEST
The battery test function is provided as a low battery may give non-obviously inaccurate
readings. The battery should be replaced should the red light illuminate when the button
is depressed.
Display light
A backlight is provided when the red button to the right of the display is depressed. The
light extinguishes when the button is released in order to conserve battery life.
