30
1159A 1GHz Active Differential Probe
Calibration Testing Procedures
13
Calculate CMRR.
14
Record CMRR in the “CMRR at 100 MHz” section of the Calibration Test
Record on page 36.
N o t e
CMRR must 25dB or greater.
Test CMRR at 500 MHz
Use setup files 1159CAL4a and 1159CAL4b in this
test.
1
Set the signal generator as shown in the following table.
2
Disconnect the 1159A probe from the CH1 and connect it to CH2 to
maintain a constant temperature.
3
Load setup file 1159CAL4a.
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 C of the calibration fixture.
10
Load setup file 1159CAL4b.
11
Connect the 1159A probe to D of the calibration fixture.
12
Measure the maximum value of CH1.
Record V2:_____________
13
Calculate CMRR.
14
Record CMRR in the “CMRR at 500 MHz” section of the Calibration Test
Record on page 36.
N o t e
CMRR must 19dB or greater.
CMRR in dB
20
V2 amplitude
V1 amplitude
--------------------------------
log
=
Setting
Value
Output Level
5 dBm
Frequency
500 MHz
CMRR in dB
20
V2 amplitude
V1 amplitude
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log
=
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