Keysight Technologies InfiniVision 6000L Series, Service Manual

Page: 39 / 100

Testing Performance
2
6000L Series Oscilloscopes Service Guide 39
To verify horizontal delta t accuracy
The following test is optional because horizontal Δ t accuracy is a characteristic,
not a specification.
This test verifies the horizontal Δ t accuracy. In this test, you will use the
oscilloscope to measure the output of a time mark generator.
Test limits: ±0.0015% of reading ±0.1% of full scale ±20 ps (same channel)
1 Connect the equipment:
a For 500 MHz and 1 GHz oscilloscope models, connect the calibrator output
to the oscilloscope channel 1 input.
b For 100 MHz oscilloscopes, use a 50 Ω feedthrough termination to connect
the calibrator output to the oscilloscope channel 1 input.
2 Set up the signal source.
a Select
Marker
on the oscilloscope calibrator.
b Set the calibrator for 100 μ s markers (period = 100 μ s).
3 Set up the oscilloscope.
a Set channel 1
Coupling
to
DC
.
b On 1 GHz and 500 MHz models only, set channel 1
Imped
to
50 Ohm
.
c Press the
Display
key, then set the
Vectors
softkey to off.
d Press the
AutoScale
key.
e Set the time base to 20 μ s/div.
f Press the
Main/Delayed
(or
Zoom
) key, then set the
Time Ref
softkey to
Left
.
g Adjust the Trigger Level knob to obtain a stable display.
Table 10 Equipment Required to Verify Horizontal
Δ
t Accuracy
Equipment Critical Specifications Recommended Model/Part
Oscilloscope Calibrator Stability 5 ppm after 1/2 hour Fluke 5820A
Cable BNC, 3 feet Keysight 10503A
Feedthrough 50
Ω BNC (f) to BNC (m)
Keysight 0960-0301