JEOL JSPM-5200 Instructions Manual page 319

５ MEASUREMENT OPERATION
■ Controlling Model 5110
The following items control Model 5110.
Enable
When you check this, the system starts to connect with the lock-in amplifier using the
RS232C. Since the initialization processing of the lock-in amplifier is performed during
its connection with the PC, it takes a little time before the processing completes. If the
connection cannot complete normally, an error dialog appears. In such a case, confirm
the RS232C cable connection, the power supply of the lock-in amplifier and the
communication settings.
The PC communicates with the lock-in amplifier using the communication port 1
(COM1). So you must connect the RS-232C cable with the COM1 port of the PC.
Sensitivity
This sets the signal-input sensitivity for the lock-in amplifier. The signal-input sensitivity
determines the signal amplitude that can input into the lock-in amplifier; however, if you
set too large sens
Usually, change the setting from a large value to a small vale while
largest possible value unless the input signal becomes saturated (the OVLD indicator
lights up).
Time Constant
Set a time
The smaller the time constant, the higher the frequency signal at which you can perform
the d etection operation.
Ref. Phase
In order to use the detection operation of the lock-in amplifier, you must make equal the
phases of the reference signal and input signal. You use this control to adjust the phases
of both signals. By clicking on the Set button, you can set the phase of the reference
signal in the range of ± 180 ° . Moreover, if you click on the + 90 button, the reference
s ignal is set at t
OSC Freq uency / kHz
To o perate the loc
signa l. Usually, a signal from the oscillator, which the lock-in amplifier itself has, is used
for th is reference signal.
Set the signal frequency that is output from the oscillator in kHz order. You can also set
this by clicking on the Set button using the slider bar.
5-256
itivity, the output-signal precision from the lock-in amplifier decreases.
constant when you perform the detection operation on the lock-in amplifier.
he phase rotated 90 ° from the current phase.
k-in amplifier, the reference signal is required for locking the input
you use it, and set the
TMPM5200-2