Specifications

RIGOL Chapter 2 Performance Verification Test
DS2000 Performance Verification Guide
2-14
Time Base Accuracy Test
Specification:
Time Base Accuracy
[1]
≤ ±(25 ppm + 5 ppm/year×completed years of service
[2]
)
Note
[1]
: typical value.
Note
[2]
: for the completed years of service of the instrument, calculate it according to the date in the verification
certificate provided when the instrument left the factory.
Test Devices: Fluke 9500B
Test Procedures:
1) Connect the active head of Fluke 9500B to CH1 of the oscilloscope, as shown in the figure
below.
2) Output a sine waveform with 1 MHz frequency and 1 Vpp amplitude from Fluke 9500B.
3) Configure the oscilloscope:
a) Press CH1 in the vertical control area (VERTICAL) at the front panel to enable CH1.
b) Rotate VERTICAL SCALE
to set the vertical scale to 200 mV/div.
c) Rotate VERTICAL POSITION
to set the vertical position to 0.
d) Rotate HORIZONTAL SCALE to set the horizontal time base to 10 ns.
e) Rotate HORIZONTAL POSITION
to set the horizontal position to 1 ms.
4) Observe the display of the oscilloscope and measure the offset (ΔT) of the midpoint of the
signal relative to the center of the screen.
5) Calculate the time base accuracy, namely the ratio of ΔT to the horizontal position of the
oscilloscope. For example, if the offset of this test is 8 ns, the time base accuracy is 8 ns/1
ms=8 ppm.
6) Calculate the limit of the time base accuracy using the limit formula “±(25 ppm + 5
ppm/year×completed years of service)”.
Test Record Form:
Channel
Test Result ΔT
Calculation Result
Limit
Pass/Fail
CH1
≤
±(25 ppm + 5
ppm/year×completed
years of service
[1]
)
Note
[1]
: for the completed years of service of the instrument, calculate it according to the date in the verification
certificate provided when the instrument left the factory.