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Model 5113
Low-Noise Voltage Preamplifier
General
The model 5113 is a high performance, low noise voltage
preamplifier with continuously adjustable gain and optional high, low or
bandpass filtering. Its input can be configured for either single-ended or
true differential operation with either DC or AC coupling, and its output
will deliver up to 2 V peak to peak into a 50 W load.
All the principal instrument controls are operated via the three
front-panel rotary knobs and a back-lit LCD display shows their present
settings. The instrument also includes an optically
isolated bi-directional RS232 interface allowing remote operation and
interrogation of all controls. Since in some
experiments even the very low levels of noise generated by the internal
microprocessor that supports these capabilities may cause problems, the
unit includes a "sleep" function whereby every source of digital
noise is turned off after a predetermined interval. When in the sleep mode
the unit "wakes up" as soon as any control is adjusted and goes
back to sleep when adjustment is complete.
The unit can either be continuously line-powered from the supplied
model PS0108 power supply, or be run from the internal rechargeable
batteries which are charged whenever the power supply is connected.
Battery operation often allows troublesome line frequency pick-up to be
eliminated, as well as permitting operation away from a source of line
power.
If the signal of interest is limited to a single frequency or narrow
range of frequencies then the signal channel filters allow selective
amplification of the signal, making subsequent signal measurement, for
example on an oscilloscope or a lock-in amplifier, easier. The filters can
be switched out of use to give a flat frequency response.
The model 5113 will find uses in applications as diverse as radio
astronomy and audiometry or for independent use in test and measurement,
process control and general purpose signal amplification and is ideally
suited to work with our range of lock-in amplifiers.
Software support is available in the form of a LabVIEW driver
supporting all instrument functions, and the Acquire™ data
acquisition software. The driver and a demonstration version of the
software, DemoAcquire, are available for download from this site.
Noise Figure Contours (Typical)
Gain = x1000, AC Coupling, 10s coupling time-constant, Flat
filter mode
| Input |
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Mode |
Single-ended or true differential |
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Coupling |
AC or DC |
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AC coupling time-constant |
1 or 10 seconds |
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Impedance |
10 MW or 100 MW
// 25 pF |
|
Noise |
4 nV/ÖHz at 1 kHz
typical; see noise figure contour |
|
C.M.R.R. |
> 120 dB, DC to 1 kHz, -6 dB/octave
above 1 kHz |
| Frequency Response |
|
Flat |
DC to 1 MHz |
|
Low-pass |
0.03 Hz to 300 kHz (1-3-10) |
|
High-pass |
0.03 Hz to 300 kHz (1-3-10) |
| Filter Roll-off |
6 or 12 dB/octave |
Gain
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Coarse |
x5 to x 50,000 in 1-2.5-5 sequence,
accuracy ±1% |
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Fine |
Extends range to x1 to x100,000 in 20%
increments of the coarse setting, accuracy ±2% |
|
Vernier |
Additional 20% of coarse gain |
|
Stability |
150ppm/degree C typical |
| Output |
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Voltage |
2 V pk-pk ahead of 50 W |
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Impedance |
50 W |
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Distortion |
0.01 % THD |
| Drift |
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DC coupled referred to input |
10 µV/degree C max
10 µV/24 hrs at constant temperature
Front-panel DC offset control provides output null adjustment |
|
AC coupled referred to output |
Coarse gain: 75 µV/degree C
Fine gain: 75 x (Fine gain setting/coarse gain setting) µV/degree C |
| Interface |
Bi-directional optically isolated RS232. 300 - 9600
baud, no parity, 8 data bits, 1 stop bit. All instrument controls
may be set and interrogated |
Power
|
Internal
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Rechargeable, sealed lead acid batteries
automatically recharge when external power is applied. Approx. 30
hours use between charges |
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External |
a) ±18 V DC |
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b) 110 V AC or 240 V AC via external
model PS0108 power supply provided |
| Dimensions (excluding
connectors) |
8.25" wide x 11" deep x
3.5" high
(210 mm wide x 279 mm deep x 89 mm high) |
| Weight |
8.7lbs (3.95 kg) excluding power
supply |
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is
a trademark of AMETEK, Inc.