3B SCIENTIFIC PHYSICS 1017781 Manual De Instrucciones página 8

7.3 Determining the values of the capaci-
tors and resistor being used
Theoretically the discharging time 
and the charging time 
In both cases, the following applies:
       
t C R
C DC 5%
If either R or C is known, then the other value
can be calculated from . It is possible to obtain
greater accuracy for  by the following means:

Measure the discharge time τ
three times and take the average of the re-
sults.

Measure the charging time τ
times and take the average of the results.

Take the average
average values for charging and discharg-
ing.
7.4 Determining the capacitance C of an ex-
ternal capacitor

Plug in a known resistor R
10 kΩ along with the capacitor for which the
capacitance C is to be determined
e

Set the selector switch to EXTERN.

Measure the time t

Calculate the capacitance of the external
t

capacitor: 5%
C

e
3
7.5 Determining the capacitance C
ternal capacitor

Set the selector switch to INTERN 3.
 Measure the time 

Plug in an external capacitor C
 Measure the time 
The following is now true:
  
   
3 C
3 C R ,
1 i 3 2
 
C C

2 i
Therefore:

C
1 i

C

i 1
or
  
C
e 2 1
3B Scientific GmbH ▪ Ludwig-Erhard-Str. 20 ▪ 20459 Hamburg ▪ Germany ▪ www.3bscientific.com
for 0.5 V
DC
for 9.5 V are identical.
C
 
  
ln 20 3 C R
.
for 0.5 V
DC
for 9.5 V three
C
1
 
   
t of the
5% C DC
2
of no less than
e
as specified under 7.3.
5%
R
e
of the in-
i
as specified under 7.3.
1
.
e
as specified under 7.3.
2
 
 
C R
i e 3
C
 
e e
1
C
i
Subject to technical amendments
© Copyright 2022 3B Scientific GmbH
7.6 Determining the values of the internal
resistors

Set the selector switch to INTERN 1, IN-
TERN 2 or INTERN 3.

Measure the time t

Calculate the resistance of the respective
internal resistor:
R
8. Storage, cleaning and disposal

Keep the equipment in a clean, dry and
dust-free place.

Always disconnect the equipment from the
mains before cleaning.

Do not use aggressive cleaning agents or
solvents to clean the equipment.

Use a soft damp cloth for cleaning.

Packaging should be disposed of at a local
recycling facility.

Should you need to dis-
pose of the equipment
itself, never throw it
away in normal domes-
tic waste. Local regula-
tions for the disposal of
electrical equipment
will apply.
as specified under 7.3.
5%
t

5% .

i
3 C
i