
2-8
IM 701210-05E
2.2 Setting the Horizontal and Vertical Axes
Input Coupling <Section 5.5>
If you wish to observe 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 wish to
check the ground level or observe the entire input signal (both the DC and AC
components). In these cases, you 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.
Select from the following types of input coupling.
DC
The input signal is directly coupled to the attenuator of the vertical control circuit. Select
DC when you wish to observe the entire input signal (DC and AC components).
AC (Only When Observing the Voltage)
The input signal is coupled to the attenuator of the vertical control circuit through a
capacitor. Select AC when you wish to observe 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
Input
terminal
1 M
Ω
Input
terminal
DC
AC
GND
Vertical
control
circuit
Vertical
control
circuit
TC (Only When Observing the Temperature)
Select TC when observing the temperature on the 701261 (UNIVERSAL), 701262
(UNIVERSAL (AAF)), or 701265 (TEMP/HPV).
DC-RMS
Using the 701260 (HV (with RMS)), both the DC and AC components of the signal are
converted to rms values and displayed. A 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 701260 (HV (with RMS)), only the AC component of the signal is converted to
rms values and displayed. A 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 when measuring acceleration on the 701275 (ACCL/VOLT).