1
www.phywe.com, © All rights reserved
13621.00 / 3209
Operating instructions
Electrometer Amplifier
13621.00
PHYWE Systeme GmbH & Co. KG
Robert-Bosch-Breite 10
D-37079 Göttingen
Phone
+49 (0) 551 604-0
Fax
+49 (0) 551 604-107
Internet
www.phywe.com
Fig. 1: Front view of the Electrometer Amplifier 13621.00.
The unit complies with
the corresponding EC
guidelines.
1
2
8
5
7
4
6
3
9
CONTENTS
1
SAFETY PRECAUTIONS
2
PURPOSE AND DESCRIPTION
3
FUNCTIONAL AND OPERATING ELEMENTS
4
NOTES ON OPERATION
5
TECHNICAL SPECIFICATIONS
6
MODES OF OPERATION
7
MEASUREMENT PROCEDURES
8
SETS OF EQUIPMENT FOR EXPERIMENTS
WITH THE ELECTROMETER AMPLIFIER:
9
NOTES ON THE GUARANTEE
10
WASTE DISPOSAL
1 SAFETY PRECAUTIONS
•
Carefully read these operating instructions completely
before operating this instrument. This is necessary to
avoid damage to it, as well as for user-safety.
•
Only use the instrument in dry rooms in which there is no
risk of explosion.
•
Only use the instrument for the purpose for which it was
designed.
2 PURPOSE AND DESCRIPTION
Charges that have resulted from static electricity can be
determined by transferring the charge to a capacitor of known
capacitance and measuring the electrical potential of this. It is
difficult to measure this potential with customary measuring
instruments, as a current flows through the measuring
instrument and this leads to decay of the applied charge. The
smaller the internal resistance of the measuring instrument,
the quicker the potential is reduced. Customary measuring
instruments have an internal resistance of about 10 M Ohms.
This electrometer amplifier has it its disposal a voltage input
with a very high internal resistance (> 10
13
Ohms), and can
so be used to measure such charges.
In general, the electrometer amplifier can be implemented to
measure so-called "soft" voltages, i.e. of voltages that break
down with small flows.
For example:
- Potential across a charged capacitor
- Voltage of a weakly lit solar cell
- Voltages that decay at a high ohmic resistance
The electrometer amplifier described here can so be used to
demonstrate many physical effects in electrostatics.
Individual measuring procedures are described in section 7.
