Key Specifications And Benefits - Ametek 7280 Instruction Manual

1.3 Key Specifications and Benefits

The SIGNAL RECOVERY Model 7280 represents a significant advance in the
application of DSP technology in the design of a lock-in amplifier. Until now,
limitations in the available semiconductor devices have restricted the operating
frequency range of such instruments to at most a few hundred kilohertz. The model
7280, with its use of the latest technology, extends this limit to 2 MHz. What is more,
it does this without compromising any other important specifications.
Key specifications include:
Frequency range:
Voltage sensitivity:
Current input mode sensitivities:
Line frequency rejection filter
Dual phase demodulator with X-Y and R-θ outputs
Very low phase noise of < 0.0001
Output time constant:
5-digit output readings
Dual reference mode - allows simultaneous measurement of two signals at
different reference frequencies up to 20 kHz, or 800 kHz with option 7280/99 or
2.0 MHz with option 7280/98
Single and dual harmonic mode - allows simultaneous measurement of up to two
different harmonics of a signal at up to 20 kHz, or 800 kHz with option 7280/99
or 2.0 MHz with option 7280/98
Virtual reference mode - allows reference free measurement of signals up to
2.0 MHz
Spectral Display mode shows frequency spectrum of the signal prior to the
demodulators to help in selecting a reference frequency
Direct Digital Synthesizer (DDS) oscillator with variable amplitude and
frequency
Oscillator frequency and amplitude sweep generator
8-bit programmable digital I/O port for external system control
Four auxiliary ADC inputs and two auxiliary DAC outputs
Chapter 1, INTRODUCTION
0.5 Hz to 2.0 MHz
10 nV to 1 V full-scale
1 pA to 100 µA full-scale
10 fA to 1 µA full-scale
10 fA to 10 nA full-scale
°
rms
1 µs to 100 ks
1-3