User manual

Adjustments

2-10

P6015A Instruction Manual

Bandwidth and Rise Time Verification

The followi ng che ck is part of the pe rformance verification

procedure. You may omit it if you are performing the adjustment

procedure.

1. Substitute the sine wave generator for the calibration generator.

2. Set the oscilloscope vertical deflection to 1 mV/div (1 V/div

when using the readout option), and set the time base to display

10 s/div.

3. Set the generator frequency to 50 kHz, and set the a mplitude to

display five divi sions peak-to-pe ak.

4. Increase the gene rator fre quency to:

H 75 MHz for a 10 ft. (3 m) cable.

H 25 MHz for a 25 ft. (7 m) cable.

while observing the oscilloscope display. Set the generator

frequency to the point of lowest amplitude at or below

75 MHz (10 ft. cable) or 25 MHz (25 ft. cable).

5. The amplitude of the wave form should be at least 3.5 divisions

(0.707 of the amplitude in Step 3).

This procedure does not check rise time directly, but it can be

approximated by the ratio t

= 0.35 / bandwidth.