Specifications

12
May. 2008 DD-7
5. Turn the D.TIME control clockwise all the way. Verify that while the
control is being turned all the way clockwise from the 12 o’clock position,
the CHECK LED stays dark. When the control has been turned clockwise
all the way, the LED lights up red.
fig.DD-7-wave-1.eps_75
4. VR Check (MODE)
Make the connections shown below to the INPUT and OUTPUT jacks on the
DD-7, using the settings indicated.
INPUT A: Input a rectangular wave at 400 Hz, 800 mVp-p.
INPUT B: Input a rectangular wave at 400 Hz, 800 mVp-p.
OUTPUT A: Connect the oscilloscope.
OUTPUT B: Connect the oscilloscope.
Set the oscilloscope to 500 mV/DIV, 1 ms/DIV, and coupling: DC.
1. Verify that the MODE control is at the REVERSE position.
Verify that waveforms like those shown in the figure below are output.
The CHECK LED lights up orange.
fig.DD-7-wave-1.eps_75
2. Adjust the MODE knob to the ANALOG position.
Verify that waveform output stops.
The CHECK LED goes dark.
fig.DD-7-wave-2.eps_75
3. Adjust the MODE knob to the MODULATE position.
Verify that waveforms like those shown in the figure below are output.
The CHECK LED lights up orange.
fig.DD-7-wave-1.eps_75
4. Adjust the MODE control to the HOLD position.
Verify that waveform output stops.
The CHECK LED goes dark.
fig.DD-7-wave-2.eps_75
5. Adjust the MODE control to the 50 ms position.
Verify that waveforms like those shown in the figure below are output.
The CHECK LED lights up orange.
fig.DD-7-wave-1.eps_75