Precautions when using a trigger analog time adjustment jig
When using a trigger analog time adjustment jig instead of the PSPL2600 or SG-503, connect a –
10dB attenuator to the output of the adjustment jig, and with CH1 set to 50Ω input and a 20mV/div
range, verify that the output amplitude is approximately 7 div before making adjustments.
Set the CH1 OFFSET to 0.0000V and the trigger level to DC0.0mV.
The relationship between ”Adjust item” and output frequency of the adjustment jig is listed below.
“Pulse 4ns” Æ Set output frequency to 125MHz and adjust automatically.
“Pulse 8ns” Æ Set output frequency to 62.5MHz and adjust automatically.
“Interval 4ns” Æ Set output frequency to 250MHz and adjust automatically.
“Interval 8ns” Æ Set output frequency to 125MHz and adjust automatically.
6.9.3.8.2 Manual adjustment
Glitch trigger time
Adjustment standard ± (0.5% + 0.5ns)
Setting Trigger Ref4 at time of adjustment: Smart Trigger - Width - Greater Than
Ref3 at time of adjustment: Smart Trigger - Width - In Range – Limits
Slope : Positive (when the output from the PSPL2600 is a positive pulse)
LEVEL : Midpoint of amplitude
Adjustment method Set the amplitude of the signal source to approximately 6.0div. Open the
“Maintenance1” menu and adjust as indicated below, using PSPL2600 as the
signal source.
After the adjustment is complete, click ”Save To HW” to save to the EEPROM.
Adjustment item Time setting Adjustment method
4ns Ref4 Lower Limit 4.0ns Adjust to achieve sync with a pulse width of 4.0 ns or more.
8ns Ref4 Lower Limit 8.0ns Adjust to achieve sync with a pulse width of 8.0 ns or more.
32ns Ref4 Lower Limit 32ns Adjust to achieve sync with a pulse width of 32 ns or more.
64ns Ref4 Lower Limit 64ns Adjust to achieve sync with a pulse width of 64 ns or more.
4ns Rref3 2.0ns≤W≤4.0ns Adjust to achieve sync with a pulse width of 4.0 ns or less.
8ns Ref3 2.0ns≤W≤8.0ns Adjust to achieve sync with a pulse width of 8.0 ns or less.
32ns Ref3 2.0ns≤W≤32ns Adjust to achieve sync with a pulse width of 32 ns or less.
64ns Ref3 2.0ns≤W≤64ns Adjust to achieve sync with a pulse width of 64 ns or less.
Notes: Pulse width is defined as the time width at 50% of the pulse amplitude, and therefore unless
the trigger level has been set to 50% of the pulse amplitude, adjustments will be unsuccessful
When adjusting Ref3 and Rref4, adjust Ref4 first. (If Rref4 has not already been adjusted,
Rref3 may be difficult to adjust in some cases.)
Maintenance 6-45
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