Model 7000 - Krohn

Model 7000 - Krohn
Model 7000
DC to 1MHz
Low Noise Differential Preamplifier
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Noise (RTI): 7nV/√Hz
Gain Settings: x1, x10, x100 and x1000
Amplitude Flatness: ±0.3dB
Output: ±10V Peak
Selectable Bandwidth:
100Hz, 3kHz, 30kHz,
100kHz and 1MHz (LP Off)
CMRR: >100dB at 1kHz
Optional RMS-to-DC Output
DESCRIPTION
The Krohn-Hite Model 7000 Differential Preamplifier provides a low noise high gain amplification to 1MHz with an
AC output derived from a very low noise FET instrumentation amplifier and an optional DC (RMS-to-DC converted)
output. The Model 7000 has fixed gain settings of x1 (0dB), x10 (20dB), x100 (40dB) and x1000 (60dB) over a
selectable bandwidths of 100Hz, 1kHz (HP), 3kHz, 30kHz, 100kHz and 1MHz (LP Off). Noise referred to input is
7nV√Hz and common mode rejection is >100dB at 1kHz.
The Model 7000 also provides momentary pushbutton switches that control coupling, bandwidth, gain and channel
on/off selections. BNC connectors are provided for single-ended and differential input, ac output, and RMS-to-DC
output (optional) connections.
The Model 7000 is very useful for troubleshooting sources of noise, amplifiers, power supplies and various other
electronic circuits. The Model 7000 is an excellent tool as a preamp for amplifying low level input signals to
oscilloscopes or other devices.
SPECIFICATIONS
INPUT
Configurations: Single-ended and differential.
Coupling: AC (0.16Hz) and DC, switch selectable.
Impedance: 1M ohm shunted by 40pF. Each input may be independently enabled or grounded.
Maximum Input Voltage: 10V peak with gain set to x1.
Max Safe Voltage: Any continuous voltage between ±30V.
Gains: 2 pushbutton momentary switches, x1 (0dB), x10 (20dB), x100 (40dB), x1000 (60dB).
Accuracy: ±0.3dB.
Stability: 200ppm/ºC.
Bias: 15pA typical, 50pA max.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301 U.S.A.
Tel: 508-580-1660; Fax: 508-583-8989; email: sales@krohn-hite.com
Page 1 of 3 - 7000Data.doc Jan/2012 V1.4
CMMR
FREQ
GAIN = 1
GAIN = 10 to 1k
50Hz
>90dB
>105dB
10kHz
>75dB
>90dB
50kHz
>60dB
>75dB
FILTERS
Filtering: Frequency limited by a switch selectable 12dB/octave filter, with -3dB points of 1kHz, high-pass and
100Hz, 3kHz, 30kHz, 100kHz, low-pass. LP OFF position to turn off low-pass filtering, bandwidth is 1MHz.
Wideband Noise (RMS - 2MHz Bandwidth Detector)
GAIN
FILTER OFF
(µV)
100kHz
FILTER (µV)
1
120
90
10
14
9
100
10
3.2
1k
10
3.2
Noise Density (x1k gain setting, all filters off): 7nV/√Hz typical.
OUTPUT
Maximum Output Voltage: 10V peak.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301 U.S.A.
Tel: 508-580-1660; Fax: 508-583-8989; email: sales@krohn-hite.com
Page 2 of 3 - 7000Data.doc Jan/2012 V1.4
Impedance: 50 ohms, single-ended.
Distortion: 0.005% (-85dB) at 1kHz.
Offset Voltage: Adjustable to zero, front panel.
GENERAL
Protection: Input overload protection with automatic recovery.
Isolation to Chassis: ±200Vdc.
Operating Temperature: 0ºC to +45ºC.
Storage Temperature: -25ºC to +70ºC.
FRONT PANEL
Momentary switches for Coupling, Bandwidth, Input On/Off, and Gain. BNC connectors for + Input, - Input, AC
Output and optional RMS-to-DC Output.
REAR PANEL
Switch selectable line switch for 115V/230V ac operation, 3-terminal AC line receptacle.
Power Requirements: Switch selectable, 105-130, 210-260 volts, single phase, 50-60Hz, 11 watts.
Dimensions: 3.5" (9cm) high, 9" (23cm) wide, 8.5" (21.7cm) deep.
Weight: Net weight 5 lbs (2.3kg), gross weight 7 lbs (3.2kg).
OPTIONS
RMS to DC Output: The RMS-TO-DC Output terminal provides a true RMS DC voltage representation of the
OUTPUT signal. Range is 0V to 10V.
Frequency Response:
Amplitude
(rms)
1% Error
Bandwidth
10% Error
Bandwidth
7V
100kHz
1MHz
2V
200kHz
1MHz
1V
200kHz
1MHz
100mV
100kHz
400kHz
10mV
10kHz
40kHz
ACCESSORIES
Rack Mount Kit: Part No. RK-39 permits the installation of the Model 7000 into a standard, 19" rack spacing.
CAB-025: Cable, BNC, 3ft, Low Noise
Extended 1 Year Warranty: Part No. EW7000.
Specifications subject to change without notice.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301 U.S.A.
Tel: 508-580-1660; Fax: 508-583-8989; email: sales@krohn-hite.com
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