Teledyne LeCroy ZS4000 User Manual
Page 24
ZS4000 High-Impedance, Active Probe
18
923360-00 Rev A
B. LF Attenuation Accuracy
1. Set the oscilloscope channel 1 to 1 MΩ input coupling. Set the vertical
scale on both C1 and C2 to 200 mV/div.
2. Set the function generator to Hi Z output termination and set the output
to a 100 Hz sine wave with 500 mVrms amplitude.
3. Turn on a measurement of the sdev(C1) and sdev(C2). The sdev function
measures the rms voltage of a waveform.
4. Record the mean of the sdev(C1) on the test record as “Generator Output
Voltage, mid range.”
5. Record the mean of the sdev(C2) on the test record as “Measured Output
Voltage, mid range.”
6. Calculate the accuracy by taking (Measured Output – Generator
Output)/(Generator Output). Record this value as a percentage on the
test record as “Gain Error, mid range.”
7. Verify that the accuracy is < ±2.0%.
8. Set the function generator amplitude to 5 Vrms.
9. Set the vertical scale on both C1 and C2 to 2 V/div.
10. Record the mean of the sdev(C1) on the test record as “Generator Output
Voltage, top range.”
11. Record the mean of the sdev(C2) on the test record as “Measured Output
Voltage, top range.”