1、 Purpose:
A micro photometer (also known as a visible light photometer or blackmeter) is one of the complete sets of equipment for spectroscopic instruments. The main purpose is to measure the blackness of spectra captured by various spectrometers, in order to determine the content of the measured elements and complete the quantitative analysis of spectra. It can also be used for density inspection and photosensitive capacity inspection of photographic film layers, as well as for aberration measurement in conjunction with other optical instruments.
2、 Specifications
1. Measurement system magnification 20 times N A 0.26
23 times N A 0.30 26 times N A 0.34
29 times N A 0.38
2. Projection system with a magnification of 21 times
3. Illuminator 12 volt, 50 watt incandescent bulb
4. Main slit
Width adjustment range: 0-3 millimeters
Indication: 0.01 millimeters
Height adjustment range: 0-20 millimeters
Indication: 2 millimeters
5. Workbench
Vertical movement range: 0-90mm
Indication: 1 millimeter
Lateral movement range: 0-220 millimeters
Lateral micro motion range: 0-25 millimeters
Micro motion indication: 0.01 millimeters
6. Selenium photovoltaic cell
Effective area: Φ 25 millimeters
Sensitivity: 400-500 microamperes per lumen
Working life: 500 hours
7. Galvanometer
Sensitivity: 2.5 × 10-9 A/mm/m
Oscillation period: 1 second
8. The weight of the instrument is 50 kilograms
9. Dimensions: 1500 × 900 × 800 millimeters

3、 Instrument completeness
1. One micro photometer (with built-in ammeter)
2. Four lighting fixtures (12V, 50W)
3. One selenium photovoltaic cell
4. Foot pads (one of which is softer) 3 pieces
5. Adjust one square hole wrench
6. One copy of the user manual