Kenwood CS-1100 Instruction Manual page 23

Expanded sweep waveform display.
2. The vertical calibration coefficient is now the reference
signal's amplitude (in volts) divided by the product of
the vertical amplitude set in step 1 and the VOLTS/DIV
setting.
Using the formula:
Vertical coefficient
_ Voltage of the reference signal (V)
Vertical amplitude (div) x VOLTS/DIV setting
3. Remove the reference signal and apply the unknown
signal to the INPUT jack, using the VOLTS/DIV control
to adjust the display for easy observation. Measure the
amplitude of the displayed waveform and use the
following relationship to calculate the actual amplitude
of the unknown waveform.
Using the formula:
Amplitude of the unknown signal (V)
= Vertical distance (div) x Vertical coefficient
x VOLTS/DIV setting
Reference signal
Phase difference
Fig. 23
Adjusted reference signal
- Unknown signal
Fig. 24
[EXAMPE]
For the example, the VOLTS/DIV is 1 V.
The reference signal is 2 Vrms. Using the VARIABLE, ad-
just so that the amplitude of the reference signal is 4 divi-
sions. (See Fig. 24)
Substituting the given value:
2 Vrms
Vertical coefficient =
4 (div) x 1 (V)
Then measure the unknown signal and VOLTS/DIV is 2 V
and vertical amplitude is 3 divisions.
Substituting the given value:
Effective value of unknown signal = 3 (div) x 0.5 x 5(V)
* Period
Setting the relative sweep coefficient with respect to a
reference frequency signal.
Procedure:
1. Apply the reference signal to the INPUT jack, using the
VOLTS/DIV and VARIABLE to obtain an easily observed
waveform display.
Using the S W E E P TIME/DIV and A VARIABLE controls
adjust one cycle of the reference signal to occupy a fix-
ed number of scale divisions accurately. After this is
done, be sure not to disturb the setting of the VARIABLE
control.
2. The Sweep (horizontal) calibration coefficient is then
the period of the reference signal divided by the product
of the number of divisions used in step 1 for setup of the
reference and the setting of the SWEEP TIME/DIV con-
trol.
Using the formula:
Sweep coefficient
Period of the reference signal (sec)
Horizontal width (div) x SWEEP TIME/DIV setting
_ _
= 0 . 5
= 7.5 V rms
2 3