Megatron Analogue Light Meters (Photometers / Lightmeters / Luxmeters)

Megatron closed down operations at the end of February 2010. OTC provides these Megatron pages for information only.


megatron DA12megatron DA4
Megatron DA12 & DA4

Megatron DA & EA Light Meters (Lightmeters)


The DA light meters are a range of seven amplified analogue light meters with 45mm Type M Photocells in domed ‘Perspex’ cosine correcting mounts. The four instruments covering the lowest light levels (with ranges of 0-10 lux and lower) have illuminated scales to enable them to be more easily read in the poor light – see the Table below for details including the ranges. Special versions of these meters with different ranges and using other photocells can be made to meet your requirements.

DA & EA Light Meters - Ranges

 
Model Reference        
Light Ranges -Lux
 DA4 DA4/H DA5 DA7 DA10 DA10/L DA12 EA2 EA22 
0 - 100 000
 
 
 
 
 
  
 
*
 
 
*
 
*
 
*
 
0 - 25 000
 
 
 
 
 
  
*
 
*
 
 
*
 
*
 
*
 
0 - 10 000
 
 
 
 
 
 
*
 
*
 
*
 
*
 
*
 
*
 
0 - 2 500
 
 
 
*
 
 
*
 
*
 
*
 
*
 
*
 
*
 
0 - 1 000
 
*
 
*
 
 
*
 
*
 
*
 
*
 
*
 
*
 
0 - 250
 
*
 
*
 
 
*
 
*
 
*
 
*
 
 
 
0 - 100
 
*
 
*
 
 
*
 
*
 
*
 
*
 
 
 
0 - 25
 
*
 
 
 
*
 
*
 
*
 
*
 
*
 
 
 
0 - 10
 
 
 
 
 
*
 
 
*
 
*
 
*
 
 
 
0 - 2.5
 
 
 
 
 
*
 
 
*
 
*
 
*
 
 
 
0 - 1.0
 
 
 
 
 
*
 
 
 
*
 
*
 
 
 
0 - 0.25
 
 
 
 
 
*
 
 
 
*
 
*
 
 
 
Illuminated Scale
 
 
 
 
 
*
 
 
*
 
*
 
*
 
 
 
Scale Length         mm
                                  in
 
70
2.75

 

The EA2 and EA22 light meters were developed for botanical and agricultural work and research; they have a small measuring head to reduce disturbance to foliage, and are capable of measuring the high light intensities encountered in outdoor work. The photocell used is a 16mm Megatron Type B, potted to give protection against humidity, and mounted in a flat cosine correcting mount. The colour sensitivity of the Type B cell is more suited to botanical work than the Type M cells used in the DL and DA meters. The EA2 has one measuring head mounted on a 250mm (10in) handle, extendable to 500mm (20in). The EA22 has two measuring heads, each with an extendable handle as with the EA2; either of these heads can be selected with the ON/OFF switch.

DA & EA Light Meters - weights and dimensions

Model Reference
DA4 DA4/H DA5 DA7 DA10 DA10/L DA12 EA2 EA22 
Dimensions           mm
                                  in
 
H 75 x W 135 x L 295
H 3 x W 5.25 x L 11.5
 
Length of lead
 
20.0 m / 79 in
 
Weight                   kg
                            lb-oz
 
1.2
2-10
 
1.2
2-10
 
1.3
2-14
 
1.3
2-14
 
1.3
2-14
 
1.3
2-14
 
1.3
2-14
 
1.8
3-15
 
2.2
4-13

Both the DA and the EA meters are amplified and use a 9v battery; meters with an illuminated scale also use four 1.5v batteries independently for this purpose.

Standard ON/OFF Switch
For the convenience of those using the many different types of our light meters, we have standardised our ON/OFF switch as far as possible with the following positions:
· the OFF position where the micro-ammeter is short-circuited to protect it during transit and when the instrument is not in use
· the ON position - the EA22 has an ON position for each of the sensitive heads
· the ON + LIGHT position for those instruments with illuminated scale
· the BATTERY CHECK position where the meter acts as a 10v voltmeter

The operation of these light meters is very straightforward. The left hand rotary switch is the standard ON/OFF switch described above; the right hand switch selects the appropriate range, and the illuminance on the cell is read directly in lux (or foot candles if required).


Price List

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