3B Scientific Electrometer Box - Manual

3B SCIENTIFIC® PHYSICS
1
Electrometer Box U11375
Instruction sheet
01/09 Hh
1. Safety instructions
The electrometer box has an extremely high
resistance at its voltage input, and can be damaged if
an excessive voltage is applied.
• Do not exceed the maximum input voltage of ±8
V!
• If necessary connect voltage-limiting components
to the input!
2. Description
The electrometer box is an impedance converter with
an extremely high input resistance for measuring very
small charges or currents.
It can be used in conjunction with the 3B NETlog TM
unit (U11300) for single manual measurements or
with 3B NETlab
TM (U11310) for recording and analysing
measurements.
The electrometer box is recognised automatically by
the 3B NETlog
TM unit..
3. Equipment supplied
1 Electrometer box
1 miniDIN 8-pin connecting lead, 600 mm long
1 Instruction sheet for U11375
4. Technical data
Input resistance: > 10 11 ohms
Input capacitance: < 50 pF
Measurement error: < 1.5%
Overvoltage tolerance for non-hazardous
contact voltages:
1 kV (for low-
resistance
sources)
10 kV (for high-resistance
sources)
Connectors: 4-mm safety sockets
5. Operation
• Connect the electrometer box to an analog input
of the 3B NETlog
TM unit (input A or B).
• Short-circuit the input and calibrate the offset so
that the output reading is zero.
• Carry out the chosen experiment without delay so
that there is not time for stray charge to collect
on the input terminals.
• Before starting a new experiment short-circuit the
input again.