Teledyne LeCroy ZD1500 - Manual (Page 23)

Instruction Manual
921921-00 Rev A 17
B. LF Attenuation Accuracy
1. Connect the BNC tee to the output of the function generator.
2. Carefully insert the Straight Tips (supplied in accessory kit) into the
sockets of the probe head. Attach the red lead of the mini-grabber to
the positive (+) signal input and the black lead to the negative (-) input of
the probe head.
3. Connect the BNC connector of the mini-grabbers to the BNC tee on the
output of the function generator.
4. Attach a BNC cable to the unused female port of the BNC tee, connect a
dual banana plug adapter to the other end of the cable and plug the dual
banana plug adapter into the DMM input. Be sure the side of the banana
plug adapter corresponding to the BNC shield (marked "GROUND") is
connected to the LOW or COMMON input of the DMM.
5. Set the DMM to read AC volt and set the range to measure 5.0 Vrms.
6. Set the mode of the function generator to sine wave, the frequency to
70 Hz and the output amplitude to 5 Vrms ±10 mV as measured on the
DMM.
7. Record the output voltage to 1 mV resolution as "Generator Output
Voltage" in the Test Record. Be careful not to alter the output amplitude
after the reading is recorded.
8. Remove the probe from C1 of the scope and re-connect using the
Probus extender cable. Connect one end of a BNC cable to the probe
end of the extender cable, and the other end to the precision 50Ω
adapter.
9. Set the vertical scale of C1 to 1 V/. Select the probe dialog tab and
record the value listed for ‘Effective Gain, top range’ on the test record.
10. Take the recorded generator output voltage and divide by the effective
gain. Record this value as ‘Expected Output Voltage, top range’ on the
test record.
11. Connect the banana plugs of the precision 50Ω adapter to the input of
the DMM. Measure the output voltage and record this as ‘Measured
Output Voltage, top range’ on the test record.