29
1159A 1GHz Active Differential Probe
Calibration Testing Procedures
5 Connect the function generator to CHANNEL C BNC on the calibration
fixture.
6 Measure the amplitude of the function generator output (CH4).
Record V1:_____________
7
Measure the maximum value of CH1.
Record V2:_____________
8
Calculate CMRR.
9 Record CMRR in the “CMRR at 1 MHz” section of the Calibration Test
Record on page 36.
Note CMRR must 40dB or greater.
Test CMRR at 100 MHz Use setup files 1159CAL3a and 1159CAL3b in this
test.
1
Set the signal generator as shown in the following table.
2 Disconnect the 1159A probe from CH1 and connect it to CH2 to maintain
a constant temperature.
3 Load setup file 1159CAL3a.
4 Connect the signal generator to CH1 on the oscilloscope.
5 Measure the amplitude of the signal generator output.
Record V1:_____________
6
Remove the signal generator from CH1.
7 Remove the 1159A probe from CH2 and connect it to CH1.
8 Select Auto Zero under the probe menu.
Do not connect the probe tip to the calibration fixture during Auto Zeroing.
9
Connect the signal generator to BNC D of the calibration fixture.
10 Load setup file 1159CAL3b.
11 Connect the 1159A probe to D on the calibration fixture.
12 Measure the maximum value of CH1.
Record V2:_____________
CMRR in dB 20
V2 amplitude
V1 amplitude
--------------------------------
log=
Setting Value
Output Level 5 dBm
Frequency 100 MHz
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