Adjustment Procedure
Setting the Calibrator Output Signal
This section tells how to set the calibrator for the DC Voltage, Time Mark, Deskew
and Sine signals that are required by the adjustment procedure.
DC Voltages
Use one of the following three methods to set the DC voltage: to 0 V, to any
voltage into 1 M
Ω
or
≤
5.5 V into 50
Ω
, or to voltages over 5.5 V into 50
Ω
.
For 0 V.
Complete these steps to set the calibrator output for 0 V and start the adjustment
step:
1.
Push the
DC/Square
button.
2.
Ground the signal by pushing the grounding
lower-bezel button.
3.
On the oscilloscope, push the
OK Do Next Step
right-bezel button.
For voltages Into 1 M
Ω
and voltages
≤
5.5 V into 50
Ω
.
Complete these steps to set the calibrator output for all DC voltages into 1 M
Ω
and voltages
≤
5.5 V into 50
Ω
.
1.
Select the calibrator signal type as follows:
a.
Push the
DC/Square
button.
b.
Push the
WAVEFORM
lower-bezel button, and then push the
DC
Positive
right-bezel button.
2.
Set the calibrator output channels and impedance as follows:
a.
Push the
CHANNEL SELECT
lower-bezel button.
b.
Select the channel(s) speci
fi
ed by the oscilloscope prompt.
c.
Push the
LOAD
lower-bezel button to highlight either
1 M
Ω
or
50
Ω
, as
speci
fi
ed by the oscilloscope prompt.
d.
Push the
EXIT
lower bezel button.
3.
Set the calibrator amplitude and start the adjustment step as follows:
a.
Select the
Amplitude
fi
eld using the front-panel tab key
.
b.
Set the voltage speci
fi
ed by the oscilloscope prompt.
c.
Push the
ON
button and verify that the red light turns on to indicate that
the calibrator output is on.
d.
On the oscilloscope, push the
OK Do Next Step
right-bezel button.
MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual
13
