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voltage, the input impedance of A and B are both 10 MΩ//25pF. When measuring current,
the IN+ input is connected to the ground via a 1kΩ resistor.
2.2 Rear Panel
The rear panel of SE1022D is shown in Fig.9. It includes a cooling fan, a power connector, a power switch, an USB
interface and extended functional interfaces. The extended functional interfaces include SINE OUT, TTL OUT, AUX IN,
TRIG IN,CH1&CH2 OUTPUT, and MONITOR.
Fig.9 Rear Panel of SE1022D
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 SE1022D lock-in amplifier communicates with the PC through a USB interface so that
the PC can control the SE1022D and read data directly from it.
RS-232 Interface
User can also manipulate the SE1022D lock-in amplifier on PC conveniently through the
RS-232 data interface.
SINE OUT
Both signal generators can provide programmable output. The maximized amplitude value
and output impedance of those signal are 5 Vrms and 50
Ω
. If the external reference is used,
the output signal is in phase-lock with the input reference signal
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.
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.
CH1&CH2
OUTPUT
CH1&CH2 OUTPUT range from -10V to +10V.Final result of the tested signal is
proportional to output. Configurations of range setting will be take into calculation.
MONITOR
Monitor provides an output from the signal amplifiers and filters. This is the signal just
