Check The Dc Input Dynamic Range - Tektronix TPR1000 User Manual

Table 11: Example calculation of measured gain
Vout (linear fit) slope
0.257

Check the DC input dynamic range

Use the following test to check the DC input dynamic range 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 Verification adapter, measure the resistance of the feed-thru
termination with the DMM.
3. Record its value. If it is out of specification, replace it before continuing the test.
4. Attach the probe to the TekVPI Calibration Verification adapter.
5. Ensure the probe offset is set to 0 V.
6. Set the DMM to DC Volts autoranging.
NOTE. When using the DMM function in a Keithley SMU, turn on FILTER to reduce transient output values.
7. Set the DC source current limit to 3 mA.
8. Set the source measure unit (SMU) to +1 V and record the output voltage on the DMM.
9. Set the source measure unit (SMU) to –1 V and record the output voltage on the DMM.
10. Using the readings taken in steps 8 and 9, apply the following equation to calculate the gain of the probe:
Gain = V
probe source
11. Verify that the gain is at least 90% of the nominal gain range for each input by dividing it by the nominal expected gain
and multiplying by 100:
100 x Gain
measured
12. If the value is >90%, then that limit of the dynamic range is verified.
13. Record results in test record.
14. Switch the probe to DC Reject mode.
15. While measuring the output, apply +1 V and –1 V to the input of the probe.
16. Ensure that output does not shift by more than 0.01 V during the test. Result is reported as Pass or Fail.
17. Return the probe to DC Coupling mode.
18. Record the result in the test record. (See page 34.)
TPR1000 and TPR4000 User Manual
Vin slope
0.320
÷ V
measured
÷ Gain
nominal
Performance verification
Measured gain
0.803125
31