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(3) For use with
oscilloscopes
and pen recorder
amplifiers,
set
output
switch
at the 10~ position.
output
is now 10 volts
for
full
scale meter deflection
on any range.
The frequency
response
is dc to 500 cycles
on the 10 millivolt
range rising
to 10 kc on the 10, 30 and 100 volt
ranges.
The
maximum amplitude
which can he delivered
by the amplifier
is
approximately
10 volts
peak to peak.
Maximum permissible
load
across the output
terminals
in this
mode
megohm. ~& a-
e$&t
itit
g I ?'d
of operation
is one
With the FAST-NORMAL switch
at the rear
of the instrument
in the
NORMAL position,
the negative
side of the output
is grounded to
the case of the instrument.
However in the FAST position
neither
side is grounded.
Therefore,
no difficulty
will
be experienced
using
oscilloscopes
and pen amplifiers
with
the 610 in NORMAL
operation.
However if
it
is desired
to use the FAST position,
care must be taken that
there
is no common ground between the pen
writer
or the oscilloscope
and. the Model 610 case.
H.
MISCELLANEOUS APPLICATIONS
CURRFJIT INTEGRATOR: The Model 610 may be used as an integrator
for
small currents
such as cyclotron
and mass spectrometer
beam
currents,
since
it
is basically
an operational
amplifier
with
electrometer
input
when the FAST-NORMAL switch
at the rear
is
placed
in the FAST position.
To integrate
current
connect
a polystyrene
capacitor
of suitable
value between the GUARD terminal
and the input.
The FUNCTION
switch
is set at VOLTS so that
there
is no resistance
placed
across the capacity.
Then if Fig.
610-2B is consulted,
it
can
be seen that
the standard
resistor
has been replaced
by a cap-
acitor
and the 610 is now an integrator.
The charge on the cap-
acitor
in coulombs is simply the product
of the capacitor
value
chosen (in farads)
and the setting
of the VOLTS FULL SCALE switch
(in volts).
If
it
is desired
that
a time constant
be introduced
into
the integrating
circuit,
the appropriate
shunt resistor
may
be selected
by the function
switch.
Practically
it
is suggested
that
the capacitor
be enclosed
in a
grounded can.
The connection
to the GUARD terminal
may be made
by a simple unshielded
lead.
The connection
to the input
terminal
should be made by means of a coaxial
connection
to one side of a
"tee"
adapter.
The current
input
is made to the other
side of the
"tee" .
The following
procedure
is suggested:
Turn input
switch
to ZERO
CHECK, thus removing the charge from the capacitor
and shorting
the
input.
Zero if necessary.
Turn 'Lo OPERATE.
If the integration
is to take place
over a long period
of time it
is suggested
that
the instrument
be used on the one volt
range or higher
so that
zero drift
and grid
current
will
not be fac.tors.
Iv -5
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