Tektronix 475A - Time-Duration Measurements

Determine the vertical conversion factor using this
formula:
Vertical reference signal amplitude (volt)
Conversion =
Factor vertical VOLTS/DIV
deflection X switch
(divisions) setting
Determine the arbitrary deflection factor using the
formula:
Arbitrary Vertical VOLTS/DIV
Deflection = Conversion X switch
‘Factor Factor setting
To measure the amplitude of an unknown signal, set the
VOLTS/DIV switch to a setting that provides sufficient
vertical deflection to make an accurate measurement. Do
not readjust the VAR VOLTS/DIV control. Measure the
vertical deflection in divisions and calculate the amplitude
of the unknown signal using the following formula:
Sianal Arbitrarv Vertical
Kr RE = deflection X deflection
p factor (divisions)
or
Vertical VOLTS/DIV Vertical
Signal i : |
Å = Conversion X switch X deflection
Amplitude ie:
Factor setting (divisions)
EXAMPLE: The reference signal amplitude measured is
30 volts with a VOLTS/DIV switch setting of 5 and the VAR
VOLTS/DIV control adjusted to provide a vertical deflec-
tion of 4 divisions.
Substituting these values in the vertical conversion
factor formula:
vertical 30
Conversion = 4X5 = 1.5
Factor
Then with a VOLTS/DIV switch setting of 1, the peak-
to-peak amplitude of an unknown signal, 5 divisions high
can be determined by using the signal amplitude formula:
Signal Amplitude: = 1 V X 1.5 X 5 = 7.5 volts.
TIME-DURATION MEASUREMENTS
Obtain a Normal Sweep display. Be sure the VAR
TIME/DIV contro! is set to the calibrated detent. Set the
TIME/DIV switch for a single event and position the
display to place the time measurement points to the center
horizontal graticule line (see Fig. 18).
A. 475A/DM44 Operators 37