The table gives the specifications for the models
7225/7225BFP and 7265 DSP Lock-in Amplifiers. Where specifications differ
between models they are shown on a gray background.
|
7225/7225BFP |
7265 |
| Input |
 |
 |
|
Voltage |
|
|
|
Mode |
A only, -B only or
Differential |
A only, -B only or
Differential |
|
Sensitivity |
2 nV to 1 V |
2 nV to 1 V |
|
Impedance |
|
|
|
FET Device |
10 MΩ // 30 pF |
10 MΩ //30 pF |
| |
Bipolar Device |
10 kΩ // 30 pF |
10 kΩ// 30 pF |
|
Noise |
|
|
| |
FET Device |
5 nV/√Hz at 1 kHz |
5 nV/√Hz at 1 kHz |
| |
Bipolar Device |
2 nV/√Hz at 1 kHz |
2 nV/√Hz at 1 kHz |
|
C.M.R.R. |
> 100 dB at 1 kHz |
> 100 dB at 1 kHz |
|
Gain Accuracy |
0.2% typ (full bandwidth) |
0.2% typ (full bandwidth) |
|
Line Filter |
attenuates 50, 60, 100, 120
Hz |
attenuates 50, 60, 100, 120
Hz |
|
Current |
|
|
|
Mode |
Low-noise or Wideband |
Low-noise or Wideband |
|
Sensitivity |
|
|
|
Low Noise |
2 fA to 10 nA |
2 fA to 10 nA |
|
Wideband |
2 fA to 1 µA |
2 fA to 1 µA |
|
Impedance |
|
|
|
Low Noise |
< 2.5 kΩ |
< 2.5 kΩ |
|
Wideband |
< 250 Ω |
< 250 Ω |
|
Noise |
|
|
|
Low Noise |
13 fA/√Hz |
13 fA/√Hz |
|
Wideband |
130 fA/√Hz |
130 fA/√Hz |
|
Gain Accuracy |
|
|
|
Low Noise |
≤ 0.6% typ (midband) |
≤ 0.6% typ (midband) |
|
Wideband |
≤ 0.6% typ (midband) |
≤ 0.6% typ (midband) |
| Dynamic
Reserve |
> 100 dB |
> 100 dB |
| Frequency
Response |
1 mHz to
120 kHz |
1 mHz to
250 kHz |
| Detection
Modes |
|
|
|
Phases |
2 |
2 |
|
Harmonic |
nF (nF <
250 kHz, n < 32) |
nF (nF <
250 kHz, n < 65,536) |
|
Dual Harmonic |
N/A |
Detects and
measures two different harmonics simultaneously
(F1 and F2 < 20 kHz) |
|
Dual Reference |
N/A |
Detects and
measures at two different reference frequencies simultaneously (F1
and F2 < 20 kHz) |
|
Virtual Reference™ |
N/A |
Detects a
signal without a reference
(100 Hz ≤ F ≤ 60 kHz) |
|
Spectral Display |
N/A |
Computes
and displays graphically the input signal power spectral density at
frequencies up to 60 kHz |
|
Noise |
Measures noise in a given
bandwidth centered on frequency F |
Measures noise in a given
bandwidth centered on frequency F |
| Output |
|
|
|
Fast outputs |
|
|
|
Time constant |
10 µs to 640 µs |
10 µs to 640 µs |
|
Outputs
available |
X & Y |
X & Y
or X & MAG |
|
Voltage for ±full-scale
input |
±2.5 V linear to ±300% f.s. |
±2.5 V linear to ±300% f.s. |
|
Impedance |
1 kΩ |
1 kΩ |
|
Update Rate |
166 kHz |
166 kHz |
|
Roll-off |
6 dB/octave |
6 dB/octave |
|
Other Outputs |
|
|
|
Time constant |
5 ms to 100 ks |
5 ms to 100 ks |
|
Outputs
available |
X, Y, R, q,
Noise |
X, Y, R, q,
Noise, Ratio, Log Ratio |
|
Voltage for ±full-scale
input |
±10.0 V linear to ±110%
f.s. |
±10.0 V linear to ±110 f.s. |
|
Impedance |
1 kΩ |
1 kΩ |
|
Update Rate |
200 Hz |
200 Hz |
|
Roll-off |
6, 12, 18 and 24 dB/octave |
6, 12, 18 and 24 dB/octave |
| Oscillator |
|
|
|
Amplitude Range |
1 mV to 5 V |
1 µV to 5
V |
|
Amplitude Sweep |
Linear:
computer control only |
Linear:
manual or computer control |
|
Amplitude Resolution |
|
|
|
1 µV to 4 mV |
N/A |
1 µV |
|
1 mV to 4 mV |
1 mV |
N/A |
|
4 mV to 500 mV |
1 mV |
125 µV |
|
501 mV to 2 V |
4 mV |
500 µV |
|
2.001 V to 5 V |
10 mV |
1.25 mV |
|
Frequency Range |
1 mHz to
120 kHz |
1 mHz to
250 kHz |
|
Frequency Sweep |
Linear or
Logarithmic: computer control only |
Linear or
Logarithmic: manual or computer control |
|
Impedance |
50 Ω |
50 Ω |
| Auxiliary
Control |
2 ADC &
2 DAC with ±1 mV resolution, ±10 mV accuracy in ±10 V,
8 logic lines |
3 ADC &
4 DAC with ±1 mV resolution, ±10 mV accuracy in ±10 V,
8 logic lines |
| Data
Buffer |
32k 16-bit data points |
32k 16-bit data points |
| Interface |
RS232, GPIB (IEEE-488).
A second RS232 is provided for "daisy-chain" connection of
up to sixteen compatible instruments |
RS232, GPIB (IEEE-488).
A second RS232 is provided for "daisy-chain" connection of
up to sixteen compatible instruments |
is
a trademark of AMETEK, Inc.