R
DC Amplifier
1
PURPOSE AND DESCRIPTION
The DC Amplifier is a versatile instrument for the measure-
ment of very low DC currents, for the measurement of char-
ges - in particular in experiments on electrostatics - and also
for the quasi-static measurement of direct voltages.
The selection of the 12 measurement ranges is made using
buttons. A matrix of light emitting diodes indicates the active
measurement range. An output voltage of 10V corresponds
to a full scale deflection. Any voltmeter, recorder or compu-
ter measurement system (COMEX, COBRA, CENT) can be
used for the display.
2
OPERATION
2.1 Initial operation
The DC Amplifier is connected to the AC mains using the
equipment connecting lead supplied with the instrument.
Please ensure that the mains voltage agrees with the ope-
rating voltage details shown on the nameplate. The rectan-
gular fuse holder situated above the equipment connection
plug can only be opened with the aid of a screwdriver or si-
milar tool when the mains lead is withdrawn.
Replacement fuse: M 0.2 C.
The mains switch is located at the back of the unit. The in-
strument is ready for operation immediately after being swit-
ched on.
In order that the measurement accuracy can be maintained,
a warm-up time of about 5 minutes should be allowed be-
fore taking measurements.
2.2 FUNCTIONAL ELEMENTS AND CONTROLS
1.1 BNC socket INPUT I, Q
for connecting the measurement circuit in the opera-
ting modes for current and charge measurement. The
outer pole is connected with the equipment ground
and the protective earth.
1.2 BNC socket INPUT V
for connecting the measurement circuit in the opera-
ting mode for voltage measurement. The outer pole is
connected with the equipment ground and the protec-
tive earth.
2 Button
I
for switching into the operating mode Current measu-
rement.
3 Button
Q
for switching into the operating mode Charge measu-
rement.
4 Button
V
for switching into the operating mode Voltage measu-
rement.
5 Socket
Ground
connected internally with the equipment ground and
the protective earth conductor.
6 Pair of sockets OUTPUT
for the connection of an instrument with a range
10Vdc range.
The internal voltage limit becomes active at an output
voltage of about 10.5V - i.e. the output voltage then
does not correspond to the measurement.
7 Button
INVERT
for inverting the output signal.
8
Button
for reducing the measurement range in all operating
modes.
PHYWE SYSTEME GMBH · Robert-Bosch-Breite 10 · D-37079 · Göttingen · Telefon (05 51) 6 04-0 ·Telefax (05 51) 60 41 07
13620.93
Operating Instructions
The unit complies
with the corresponding
EC guidelines.
