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CH1&CH2
The output range of CH1&CH2 OUTPUT is from -10 V to +10 V. According to ratio of the
measurement result and setting measurement range, the input is proportional to output.
SIGNAL IN
There are two signal input modes, single-ended A and differential, A-B. The input A can be
current signal. When measuring voltage, the input impedance of A and B are both 10
MΩ//25pF. When measuring current, the input is connected to the ground via a 1kΩ resistor.
2.2 Rear Panel
The rear panel of SE2031 is shown in Fig.10. It includes a cooling fan, a power connector, a power switch, an USB
interface and extended functional interfaces. The extended functional interfaces include AUX IN, AUX OUT, TRIG IN,
TTL OUT, and MONITOR.
Fig.10 Rear Panel of SE2031
Power Connector
The power connector is used to provide power for the instrument. This power connector
with a build-in fuse receives 220 V, 50 Hz AC power. And it can filter high frequency
noise.
USB
The SE2031 lock-in amplifier communicates with the PC through a USB interface so that
the PC can control the SE2031 and read data directly from it.
AUX IN
AUX_ADC input 1-4(A/D Inputs). These are auxiliary analog inputs which can be digitized.
The range is -10V to +10V.
AUX OUT
AUX_DAC output 1-4(D/A Outputs). These are auxiliary analog outputs. The range is -10V
to +10V.
TRIG IN
TRIG IN receives a TTL input used to trigger data samples and to start data acquisition. The
rise edge is effective for TRIG IN. The maximum sample rate is 500 Hz.
TTL OUT
The TTL output is synchronous with [SINE OUT]. When the amplitude of [SINE OUT] is so
small, [TTL OUT] can be used to make a sync phase lock.
MONITOR
Monitor provides an analog output signal after amplification and filtering, that is, the signal
before input to the ADC. The amplitude of MONITOR output is fixed at 5 times that of the
pre-ADC signal. The amplitude of MONITOR output is fixed at 5 times that of the pre-ADC
signal.
