14-19
IM 704510-01E
Troubleshooting and Maintenance
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14
15
Testing the A-to-B Time Interval Measurement
Instruments Required
Prepare the following instruments.
Synthesized signal generator
• Frequency range:
10 MHz to 170 MHz or higher
• Output level:
720 mV
rms
or higher
• Output level accuracy:
1.5 dB or better
• Recommended instrument: 8657B Synthesized signal generator or equivalent (by
Agilent Technologies)
• Power divider
• Characteristic impedance:
50
Ω
• Recommended instrument: 70-0966 Power Divider (by YOKOGAWA)
The procedure for testing the A-to-B time interval measurement using the
recommended instruments is described below.
Connecting the Instruments
• Check that the power switch is turned OFF on all instruments before connecting the
instruments.
• Connect the output of the synthesized signal generator to the input terminal (CH A/CH
B) of the TA720.
TA720
8657 B
10MHz REF IN
REFERENCE OUT
OUTPUT
CH B
CH A
Synthesized signal generator
(8657B)
Power divider
Instrument Settings
• TA720
• Sampling mode:
Hardware histogram mode
• Input settings:
DC coupling, 50
Ω
(both CH A and CH B), trigger level = 0 V
• Function:
A-to-B time interval
• Gate:
Event, 1000000
• Reference:
External
• X Center, X Span:
• A
↑
B
↑
or A
↓
B
↓
with CH B delay of 2.5 ns
Input Frequency
X Center
X Span
10 MHz
2 ns
15 ns
166.6 MHz
2 ns
15 ns
• A
↑
B
↓
or A
↓
B
↑
with CH B delay of 0 ns
Input Frequency
X Center
X Span
10 MHz
50 ns
15 ns
166.6 MHz
3 ns
15 ns
• Y High:
10
6
• 8657B
• Frequency:
10 MHz, 166.6 MHz
• Level:
720 mV
rms
14.6 Performance Test
