YOKOGAWA - Digital Lux Meters 51000 Series

Model

51011

51012

51021

Standard

Conforms to class A of JIS C1609-1 2006 "Illumination Meter"

Conforms to class AA of JIS C1609-1 2006 "Illumination Meter"

Photoelectric element

Silicon photodiode

Display

Liquid crystal display (number of 7 digits); maximum effective display:999; (0 or 0's to indicate the number of digits)

Measurement cycle

Twice per second

Measuring range

0.0 to 99.9/999/9,990/ 99,900/999,000lx

0.00 to 9.99/99.9/999/9,990/ 99,900/999,000lx

Accuracy(*)

±4% rdg ±1dgt
(under 3000lx)
±6% rdg ±1dgt
(over 3000lx)

±2% rdg ±1dgt (under 3000lx)
±3% rdg ±1dgt (over 3000lx)

Response time

Automatic range : 5 sec; Manual range: 2 sec

Fatigue characteristics

±2%

±1%

Temperature characteristics

±5%

±3%

Characteristics of oblique incident light

Angle of:
10° ±1.5%
30° ±3%
60° ±10%
80° ±30%
(deviation from cosine characteristics)

Angle of:
10° ±1%
30° ±2%
50° ±6%
60° ±7%
80° ±25%
(deviation from cosine characteristics)

Characteristics of visible region relative spectral response

Devation from the standard spectral luminous efficiency: f1' within 9 %

Deviation from the standard spectral luminous efficiency: f1' within 6 %

Operating temperature / humidity

-10 to 40°C 80% RH or less; no moisture condensation

Function

Response switching, Range Hold, Timer Hold, Deviation display, Auto power off

Response switching, Range Hold, Timer Hold, Deviation display, Auto power off, Color correction factor setting,Average illuminance computation, Ripple measurement, Light source luminous intensity measurement, Measurement of totalized intensity of illumination

Communication

USB

Output

DC 1V ±5% (fixed range); load resistance: 100kO or more

Dimensions, weight

Approx. 67(W) x 177(H) x 38(D) mm; Approx. 260g

Power supply

AA (LR6) x 2 OR USB supply (5 VDC ±5%)

Accessories attached

Instruction manual; dry cell (built in); soft case; recorder output plug