2-8
IM 701240-01E
Input Coupling «For procedures, see section 5.5.»
If you want to measure just the amplitude of an AC signal, it is best to remove the DC
component from the input signal. On the other hand, there are times when you want to
check the ground level or measure the entire input signal (both the DC and AC
components). In these cases, you can change the input coupling setting. By changing
the input coupling, the input method used to input the signal to the vertical control circuit
(voltage axis) is switched. The following types of input coupling are available.
DC
The input signal is directly coupled to the attenuator of the vertical control circuit. Select
DC if you want to measure the entire input signal (DC and AC components).
AC (Only When Measuring the AC Voltage)
The input signal is coupled to the attenuator of the vertical control circuit through a
capacitor. Select AC if you want to measure only the amplitude of the AC signal,
eliminating the DC components from the input signal.
GND
Input signal is coupled to the ground not to the attenuator of the vertical control circuit.
By selecting GND, you can check the ground level on the screen.
Vertical
control
circuit
Input
terminal
1 M
Ω
Vertical
control
circuit
Input
terminal
1 M
Ω
Vertical
control
circuit
Input
terminal
DC
AC
GND
TC (Only When Measuring the Temperature)
Select TC if you are measuring the temperature using the 701261 (UNIVERSAL),
701262 (UNIVERSAL (AAF)), or 701265 (TEMP/HPV).
DC-RMS
Using the 701267 (HV (with RMS)), both the DC and AC components of the signal are
converted to rms values and displayed. An RMS conversion circuit is connected to the
vertical control circuit of the same input coupling circuit used when the coupling is set to
“DC.”
AC-RMS
Using the 701267 (HV (with RMS)), only the AC component of the signal is converted to
rms values and displayed. An RMS conversion circuit is connected to the vertical control
circuit of the same input coupling circuit used when the coupling is set to “AC.”
Vertical
control
circuit
Input
terminal
1 M
Ω
Vertical
control
circuit
Input
terminal
1 M
Ω
DC-RMS
AC-RMS
RMS
conversion
circuit
RMS
conversion
circuit
AD
AD
ACCL (Only When Measuring Acceleration)
Select ACCL if you are measuring acceleration on the 701275 (ACCL/VOLT).
2.2 Setting the Horizontal and Vertical Axes