Equipment information
Keithley 604 Analog multimeter
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Model:
604
Date:
1974
Category:
Group:
Description:
DIFFERENTIAL ELECTROMETER AMPLIFIER
Information
The Keithley model 604 Differential Electrometer Amplifier
is a completely solid-state instrument that car. be used by
itself single-endedly or differentially either as an
Amplifier or a millivoltmeter.
b, when used in conjunction with the Model 6041 Differential
Current Shunt the model 604 becomes a single-ended or
differential picoammeter. Single-ended and differential
current measurements from 10⁻⁶ to 10⁻¹⁴ ampere can be made
with this setup.
Also , high megohm resistors may be installed within the
Modal 604 to allow shunt picoammeter operation.
model 604 FEATURES
a. As an amplifier, the model 604 will operate over a
bandwidth from do to 50 kHz or greater with six select able
3-dB points from 30 kz to 100 Hz, Thus, the signal-to-noise
ratio may be optimised for a particular application.
b. Th® Electrometer Amplifier has an input resistance of
greater than 10^-4 ohms shunted by less than 5 picofarads in
the unguarded position, that allows high impedance
measurement to be made easily. When in the guarded position
the input impedance is shunted by less than 1 picofarad,
c. Low offset current - less than 2 x 10⁻¹⁴ ampere -
minimizes zero offset with high source resistance and
permits maximum resolution when measuring current >
d. A choice of outputs which can be used simultaneously or
singly is available, Each input of the model 604 has' a
unity gain output, which has 3.50 ppm accuracy, This allows
the model 604 to be used as a preamplifier with differential
or digital voltmeters fox precise, measurements. Also, these
outputs can be fed into an X-Y recorder for recording data
from high impedance sources. When desired, the unity--gain
outputs can be monitored for absolute values while
recordings are made from the Amplifier output.
e. All outputs are short-circuit proof, and output noise
referred to the input is nearly constant regardless of the gain,
f. The guarding capability of the Model 504 allows fast
measurements from high resistance sources, by eliminating'
the effects of cable capacitance and leakage. To
conveniently facilitate these measurements, the Model 6301
Guarded Probe can be used to connect the source to the Model
604 in the guarded mode. The guard feature is switch selectable.
g. Another outstanding feature of the Keithley Modal 604 is
its zero stability. Signals can be monitored over weeks
without constant rezeroingg, zero drift of the Amplifier is
less than 4 millivolts per week; zero offset due to
temperature changes is less than 300 microvolts per °C, Zero
shift duo to mechanical shock or vibration is negligible.
h. Overloads up to ±400 volts will not damage the 604
Amplifier, and recovery is almost immediate. A unique
circuit provides protection while maintaining the favorable
features of the MOS FET input,
i. As another convenience feature, the model 604 provides a
vary stable ±1 volt suppression on any range. Variations as
small as 1 millivolt in a 1-volt signal can he displayed
full scale.
j. Variations in line voltages from 105 to 125 volts cause
no apparent change even on the most sensitive range. Line
frequency noise is practically eliminated from the Modal 604
output.
1~3 . MODEL 6041. The Model 6041 Differential Current Shunt
is an accessory specifically designed to convert the Model
604 Amplifier into a single-ended or differential multirange
picoammeter.
a. The driven guard enables the model 604 Amplifier and the
Model 6041 Shunt combination to obtain fast response in
current measurements, Input capacitance at the end of a
10-foot cable is maintained at 1 picofarad in the guarded
mode. As a result, rise, times of 0,5 millisecond are
possible with 10⁻¹¹ ampere input signals. Guarding is
maintained through the Model 6041 by the use of triaxial
input connectors and total guarding within the Shunt itself.
b. For those applications where maximum signal-to™noise
ratio is more desirable than fast response, the Model 604
can be used in its unguarded mode, Noise will be as low as 2
x 10⁻¹⁵ ampere using a 10¹¹ ohm resistor. However, rise
times are much longer than when the Modal 604 is in its
guarded mode. Regardless of mode, the high frequency cut-off
can be used to reduce noise at the higher frequencies ,
c. For those cases where a limited current span is to be
monitored, a pair of high megohm resistors, available as the
Model 6033, can be mounted internally within the model 604,
Although this method limits the current span to only four
decades, it does slightly Improve both the noise and the
rise time -characteristics over that obtainable with the
multi-range Model 6041 Currant Shunt. The compromise between
noise and rise time still must be made by choosing the
guarded or unguarded mode.
d. Low offset current minimizes zero offset with high source
resistance, permitting maximum resolution when measuring
current.
Manual Type:
Service and User Manual
Pages:
42
Size:
2.96 Mbytes (3105446 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
1977 01 01
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2018 08 24
MD5:
16bccdfc87c4c54e562b39ac3159452e
Downloads:
710
Information
SPECIFICATIONS ... , * iv
1. GENERAL DESCRIPTION. . , . , ... , , . . . 1
2. OPERATION. ... ... 3
3. CIRCUIT DESCRIPTION ... , ... H
4. MAINTENANCE. ... . 13
5. ACCESSORIES. ... ,25
6. REPLACEABLE PARTS, , . . . ... 27
SCHEMATICS ... 36
Manual Type:
Service and User Manual
Pages:
42
Size:
2.26 Mbytes (2370877 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2013 01 13
MD5:
3ff2f5b97a1f3b069d722e28c8e8955c
Downloads:
1507
Information
SPECIFICATIONS ... iv
1. GENERAL DISCRIPTION. ... 1
2. OPERATION.. ... 3
3. CIRCUIT DESCRIPTION. ... 11
4. MAINTENANCE ... 13
5. Accessories. ... 25
6. REPLACEABLE PARTS. ... 27
SCHEMATICS ... 36