3B SCIENTIFIC® PHYSICS
1
Planck’s Constant Apparatus (115 V, 50/60 Hz)
Planck’s Constant Apparatus (230 V, 50/60 Hz)
1000536 / U10700-115
1000537 / U10700-230
Instruction manual
01/24 ALF/UD
1 LED with connecting lead
2 Nanoammeter
3 Voltmeter
4 Protective cover for photocell
5 Collector tube for photocell
6 Coaxial power socket for power
supply
7 Power supply with connector
socket for LED
8 Back EMF adjustment (coarse)
9 Back EMF adjustment (fine)
10 Intensity knob
11 Empty sleeve
1. Notes
The photocell in the Planck’s constant apparatus
is highly sensitive. Bright light can cause it to age
quickly and can cause permanent damage. Fol-
lowing irradiation it ideally needs to be left for
quite a long period before it regains its stability.
The protective cover for the photocell should
never be removed.
When the experiment is completed, slide the
empty sleeve over the collector tube of the
photocell.
Keep the apparatus secure so that it does not
get shaken and do not expose it to extreme
temperatures, high humidity, moisture or direct
sunlight.
2. Scope of delivery
1 Basic apparatus with photocell, voltmeter,
nanoammeter and LED power supply
1 Empty sleeve for covering the photocell col-
lector tube
5 LEDs (472 nm, 505 nm, 525 nm, 588 nm,
611 nm) in case with connector leads
1 Plug-in power supply, 12 V AC
1 Instruction manual
