G O L D I L U X
L I G H T
M E T E R S
USER MANUAL
GAL - 2L, GAL - 2H,
GAL - 3L with GALP probes
GENERAL DESCRIPTION
EXTERNAL FEATURES AND CONTROLS
OPERATING INSTRUCTIONS
MAINTENANCE AND PRECAUTIONS
CALIBRATION
SPECIFICATIONS
WARRANTY INFORMATION
GENERAL DESCRIPTION
The GOLDILUX series of light meters are designed to
measure illuminance of the visible spectral radiation in the
units of lux or optionally in footcandles.
An external probe may be plugged into a light meter. In this
case the detector in the light meter is automatically
disconnected and the displayed reading corresponds to the
quantity and the units measured with the
probe
.
The liquid crystal display of the metres (GAL-2L, GAL-2H) is
auto ranging over one decade. External probes (e.g. GALP-
1L) have a built-in
probe gain selector switch
with two
different gains and thus cover a wider measuring range than
the meters with built-in detector. The probe gain settings are
multiplied as indicated on the probe labels and the switch
setting indicated by the
probe range factor
. Probes
combined with a non-specific meter (display - GAL-3L) offer
the best combination with the widest possible measuring
range.
EXTERNAL FEATURES AND CONTROLS
Fig. 3 indicates the layout and function of the switches and
connectors and other features available on the light metres.
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The ON/OFF switch (A in Fig. 3) is located on the left side
of the meter housing. To switch ON move it forward. The
meter is OFF when the switch is in the lower position.
The HOLD button (B in Fig. 3) can be used to "freeze" the
display for convenient reading by the operator. This hold
button operation can be achieved for up to 5m distance
from the instrument by means of a
remote hold cable
(optional extra)
plugged into connector C in Fig. 3. A simple
contact closure between the two
mono plug
connector pins
activates the hold ("freeze") function.
The ANALOG OUTPUT of the meter is D in Fig. 3. It can be
used to supply a 2V output for a full-scale reading. It has an
output impedance of 10 k and can be used to record light
levels on a chart recorder or any other suitable data
acquisition system. A
stereo plug
should be used to
connect the equipment to the analogy output socket.
OPERATING INSTRUCTIONS
1. Remove the instrument from its case and mount or
place it in the desired measurement position.
2
2. Switch on the instrument and check its zero with the
cap firmly on the detector. Should it be necessary to
adjust the meter reading to zero (e.g. for calibration
purposes) adjust it via the potentiometer accessible
through the latch opening in the open battery
compartment.
3. Remove
the
protective
cap from the detector being
used.
4. Take readings. Check on the units (Kilolux or lux or
footcandles as indicated by the label).
N.B.: A 9V battery is necessary for operating the instrument
and this has to be inserted in the battery compartment at
the back of the meter as shown in Fig 3.
MAINTENANCE AND PRECAUTIONS
When not in use, always put the protective cap on the
detector and keep the instrument in a safe place.
There is a warning "battery low" on the LCD display when
the 9V battery needs to be replaced.
If necessary, clean the detector with a soft clean cloth or
tissue moistened with alcohol. Dry and polish lightly with a
dry tissue.
3
CALIBRATION
1) Meters
a) Meters with a built-in detector (e.g. GAL-2L): adjust the
meter reading to zero via the potentiometer accessible
through the opening in the open battery compartment.
and the cap firmly on the detector,
b) Expose meter to a known illuminance, emitted by a
light source of the type for which the calibration is
desired. Alternatively, produce a stable illuminance with
a suitable light source of the desired type and measure
it with a calibrated light meter.
c) Adjust the meter with the calibration adjustment (F in
Fig. 3) until it reads correctly.
d) Seal the hole (F in Fig. 3) with a suitable calibration
sticker.
2) Probes
a) Plug the probe into the meter. Set the probe’s range
selector switch (A in Fig 4) to the lowest setting.
b) With the dustcap firmly in place (D in Fig 4) check the
meter reading of zero. The potentiometer P5 indicated
on the rear label of the probe has been disabled.
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Return instrument for repair if zero reading cannot be
obtained.
c) Expose probe as in 1 b) above.
d) If required the reading is adjusted by turning the
potentiometer P1 as indicated on the rear label of the
probe, until the reading is correct.
e) Set the probe range factor to the highest range factor
and adjust P2 (as marked on the rear label) until a
reading of exactly 10 times lower is achieved than with
the selector switch in the lowest range factor setting.
f) For probes with integral dose option (e.g.GALP-2L) -
please refer to the manufacturer. This range has been
discontinued in favour of a microprocessor range of
instrumentation.
g) To make the adjustments on the potentiometers P1 and
P2 it is necessary to pierce the rear label of the probe.
Seal again with suitable plastic stickers after the
calibration is completed.
NOTE :
Calibrations should only be performed by
trained metrologists in a recognized calibration
laboratory.
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