Yokogawa 51001 and 51002 Illuminance Meters

Overview
These meters are devices used for measuring brightness. They specifically measure the intensity with which the brightness appears to the human eye. Two models (51001 and 51002) are available depending on your particular requirements.

51001 and 51002 Digital Illuminance Meters

Features

Wide measurement range, high accuracy.
Spectral response characteristics for visible range.
Good oblique incident light characteristics.
Recorder output, digital output.

Standard Accessories (included)

Instruction manual, 9 volt battery installed, soft case and recorder output plug.

51001/51002 Datasheet (PDF)
(documents are in PDF format and will open in a new window)

510 Series Functions

Function	Model 51001	Model 51002
Transfer from Ix to Ic or vice vera	Yes	Yes
Response Switching	Yes	Yes
Range Hold	Yes	Yes
Data Hold	Yes	Yes
Timer Hold	Yes	Yes
Deviation Display	Yes	Yes
Color Correction Factor Setting	NO	Yes
Average Illuminance Computation	NO	Yes
Ripple Measurement	NO	Yes
Light Source Luminous Intensity Measurement	NO	Yes
Measurement of Totalized Intensity of Illumination	NO	Yes
Comparator	NO	Yes
Automatic Power Off	Yes	Yes

Accuracy Specifications (23°C ±2°C ; Accuracy: ±% of rdg. ±effective minimum digit)

Measurement

Model 51001

Model 51002

Standard

Conforms to general class A of JIS C 1609-1 2006 'Illumination Meter'

Conforms to general class AA of JIS C
1609-1 2006 'Illumination Meter'

Photoelectric Element

Silicon photodiode

Display

LCD (7-digits); Maximum effective display: 999+(0 or 0's to indicate No. digits

Measurement Cycle

Twice per second

Measurement Range

0.0 to 99.9/999/9,990/99,900/999,0001x

0.00 to 9.99/99.9/999/9,990/99,900/999,0001x

Accuracy

≤3,0001x: ±4% ±1, >3,0001x: ±6 ±1

≤3,0001x: ±2% ±1, >3,0001x: ±3 ±1

Response Time

Automatic range: 5 sec; Manual range: 2 seconds

Fatigue Characteristics

±2%

±1%

Temperature Characteristics

±5%

±3%

Characteristics of Oblique Incident Light

Angle of:	10°	±1.5%
	30°	±3.0%
	60°	±10%
	80°	±30%

Angle of:	10°	±1%
	30°	±2%
	50°	±6%
	60°	±7%
	80°	±25%

Characteristics of Visible Region Relative Spectral Response

Deviation from the standard spectral luminous efficiency: 9%

Deviation from the standard spectral luminous efficiency: 6%

High/Low Output

―

Hi/Lo two-terminal output

Recorder Output

1 Volt ±5% (fixed range); Load resistance 100kΩ or more

Digital Output

BCD serial output, open collector; comparator output

Model 51001	If the reading is 3000 Ix or less: ±8% of reading ±10 (effective minimum digit), If the reading is greater than 3000 Ix: ±12% of reading ±10 (effective minimum digit).

Model 51002	If the reading is 3000 Ix or less: ±4% of reading ±10 (effective minimum digit), If the reading is greater than 3000 Ix: ±6% of reading ±10 (effective minimum digit).

General Specifications
Display	7-digit Liquid Crystal Numeric Display (7-segment)
Operating Temperature	-10°C to 40°C; 80% RH or less (no condensation)
Power Supply	9 Volt dry cell 6F22 (S-006p) or an AC adapter (optional)
Safety Standards	BS EN 61010-1; 1993, insulation class III
Dimensions	approx. 67mm (W) x 177mm (H) x 38mm (D)
Weight	approx. 260g (including battery

Optional Accessories
RB037A	Soft Case (510 02-03)
910-02, 3	3 meter Extension Cable for Light Meter
910-03, 3	3 meter Data Output Cable for Light Meter
B96466N	AC Converter
94001	AC Converter
95001	RS-232C Converter (not isolated battery)