ELECTRO-OPTICAL PRODUCTS CORPORATION
	88-65 76th Avenue • Glendale, NY 11385, USA • Tel: 718-997-8100 • Fax: 718-997-8102 • www.eopc.com

Single Phase Lock-In Amplifiers

		LIA-410

FEATURES AND ADVANTAGES Single phase operation Differential or single-ended input Gain setting from 3uV to 1V High performance, low noise, wide bandwidth input gain stage Analog meter for display of output signal Offset controls Output time constants from 100us to 30s 1F and 2F reference signal operation 90° step and fine phase control

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The LIA-410 single phase lock-in amplifier is a general purpose benchtop instrument. The INPUT SIGNAL CHANNEL amplifies the input signal to a level suitable for the demodulator. The input circuit can accept a differential or single-ended input, via the front panel signal BNC. Jumper options within the unit allow a high impedance differential input, a low impedance (100 ohm) differential input, or to be connected to ground for single-ended operation, via the front panel BNC. The input channel can be either AC or DC coupled via internal jumper selection. It is recommended that the unit is used in DC coupled mode for improved noise performance. In this mode, up to +/-10V of DC offset is allowed before saturation for gain setting from 1V to 300uV. A +/-1V of DC offset is allowed for gain setting from 100uV to 10uV; and +/-300mV of DC offset is allowed for the gain setting of 3uV.

Frequency	10Hz to 100kHz
Sensitivity	3uV to 1V (for 1V output) switched in 1, 3, 10 steps
Input impedance	1012 ohm || 1nF, dc coupled
Maximum inputs	+/-16V before input protection circuitry is activated
Gain accuracy	1%
Gain stability	200ppm/°C
Dynamic reserve	60dB

A very high bandwidth DEMODULATOR processes the signal and removes offsets, and a first order LOW PASS FILTER amplifies the signal before output via a front panel BNC.

Time constant: 100uS to 30s in 1, 3 & 10 steps

Output	+/-1V output corresponds to full-scale input. Short circuit protection included.
Offset	Up to 1x full scale, switch between "ON" and "OFF".

The REFERENCE INPUT CIRCUITRY uses a phase locked loop to lock on to a range of signals, such as TTL pulses or sinusoidal waveforms. A phase shifting circuit allows the removal of the reference signal with relation to the signal input, which can be monitored at both the reference frequency and twice the reference frequency.

Frequency	10Hz to 100kHz
Input impedance	5.6M ohm ac coupled
Trigger	Sine: 100mV rms min (15V max.)
	Pulse: 5V, 95% mark/space ratio min.
Acquisition time	10s max.
Phase control	90° steps + fine shift in range 0°-100°
Phase drift	0.1°/°C

GENERAL
Power	115V ac, 230V ac; 50-60Hz; 10VA max.
Dimensions	17.5" (W) × 3.5" (H) × 7.5" (D)
	440mm (W) × 87mm (H) × 190mm (D)
	19" rack mount available as a special order
Temperature range	0-50°C (operational)
Warranty	2 years from date of shipment

STANDARDS
Electrostatics discharge	BS EN 61000-4-2 Level 2
Surge	BS EN 61000-4-5 Level 3
Burst & Transient	61000-4-4 Level 2
RF Emissions	BS EN 50081-2
RF Immunity	BS EN 61000-4-3/ BS EN 50082-2
Low Voltage Directive	BS EN 61010-1