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Measurements
1780R-Series Operator’s Manual
4–33
Bowtie Measurement
Use the following information to perform bowtie measurements.
Enter Bowtie Measurement Mode
Push the MEASURE button to enable the Measurement menu,
shown in Figure 4–1.
Touch <BOWTIE> on the screen.
BOWTIE is displayed on the left CRT. The CH B1–B2 and CH
B1–B3 signals are displayed on the right CRT. The instrument is
now configured as specified in Table 4–9 and Figure 4–10.
The large knob has no function in Bowtie mode.
Bowtie Measurement Procedure
1. To check for timing and relative amplitude errors in a three-wire
signal path, route a Bowtie test signal from a generator, through
the signal path, to the 1780R-Series CH B1, CH B2, and CH B3
Inputs.
2. Push the MEASURE button, then touch <BOWTIE> on screen.
3. Check for a sharp null in the center of each half of the two-line
signal display. The timing marker details in the waveform are an
electronic graticule for calibration of the timing offsets. The
center (taller) pulse is the 0 time error mark. Each mark away
from center indicates 20 ns of relative timing error. The left half
compares CH B1 with CH B2, and the right half compares
CH B1 with CH B3.
4. A broad null indicates unequal amplitudes between signals.
Measurements
1780R-Series Operator’s Manual
4–33
Bowtie Measurement
Use the following information to perform bowtie measurements.
Enter Bowtie Measurement Mode
Push the MEASURE button to enable the Measurement menu,
shown in Figure 4–1.
Touch <BOWTIE> on the screen.
BOWTIE is displayed on the left CRT. The CH B1–B2 and CH
B1–B3 signals are displayed on the right CRT. The instrument is
now configured as specified in Table 4–9 and Figure 4–10.
The large knob has no function in Bowtie mode.
Bowtie Measurement Procedure
1. To check for timing and relative amplitude errors in a three-wire
signal path, route a Bowtie test signal from a generator, through
the signal path, to the 1780R-Series CH B1, CH B2, and CH B3
Inputs.
2. Push the MEASURE button, then touch <BOWTIE> on screen.
3. Check for a sharp null in the center of each half of the two-line
signal display. The timing marker details in the waveform are an
electronic graticule for calibration of the timing offsets. The
center (taller) pulse is the 0 time error mark. Each mark away
from center indicates 20 ns of relative timing error. The left half
compares CH B1 with CH B2, and the right half compares
CH B1 with CH B3.
4. A broad null indicates unequal amplitudes between signals.