Performance veri
fi
cation
Warm up the test equipment
1.
Turn on the TekVPI oscilloscope.
2.
Connect the TekVPI Calibration/Veri
fi
cation adapter to the oscilloscope.
3.
Connect the probe to the TekVPI Calibration Veri
fi
cation adapter and verify that the Status LED on the probe turns green.
4.
Turn on the remaining test equipment.
5.
Allow 20 minutes for the equipment to warm up.
6.
Use the test record template to record the test results.(See page 34,
Check the DC gain accuracy
Use the following test to check the DC gain accuracy of the probe.
1.
Connect the test equipment as shown in the DC setup diagram. (See Figure 6.)
2.
Before attaching the probe to the TekVPI Calibration Veri
fi
cation adapter, measure the resistance of the feed-thru
termination with the DMM.
3.
Record its value. If it is out of speci
fi
cation, replace the precision terminator before continuing the test.
4.
Attach the probe to the TekVPI Calibration Veri
fi
cation adapter.
5.
Ensure the probe offset is set to 0 V.
6.
Set the digital multimeter (DMM) to the following settings.
DC Volts auto ranging
Filter mode on
Measurement rate slow
7.
Set the DC source current limit to 3 mA.
8.
Set the DC source to the
fi
rst voltage level listed below. (See Table 9.)
NOTE.
When using the DMM function in a Keithley SMU, turn on
FILTER
to reduce transient output values.
9.
On the DMM measure the probe response and record the level in the Vout (measured) column in the following table.
Table 9: DC source voltage levels
Index
DC source voltage
Vout (measured)
Vout (linear
fi
t)
–2
–640 mV
–512 mV
–1
–320 mV
–256 mV
0
0 mV
0 mV
1
320 mV
256 mV
2
640 mV
512 mV
10.
Repeat steps 8 and 9 for each voltage level listed in the table. (See page 30,
TPR1000 and TPR4000 User Manual
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