High Performance Oscilloscope Calibrator
9510/9530/9550/9560 Head Calibration Procedures
143
7.
9500B: Select Square waveform with positive bias at 5.0000 V pk - pk
configured to drive 1 M
Ω
.
8.
On the 4955 Select “SQR o/c” (or connect the Head directly to the DMM,
configured to measure DC voltage). Turn the 9500B Output ON, allow the DMM
to settle and note the measurement in Table 46. Please note that the DMM
reading (average DC level) should be multiplied by two (pk-pk level).
9.
9500B: Select Square waveform with positive bias at 5.0000 V pk - pk
configured to drive 50
Ω
.
10.
On the 4955 Select “SQR 50
Ω
”
(or use an alternative shunt resistor). Turn the
9500B Output ON, allow the DMM to settle and note the measurement in Table
46. Please note that the DMM reading (average DC level) should be multiplied
by two (pk-pk level). Having made the necessary measurements, re-enter the
Head Calibration mode using the Mode and Cal keys.
11.
9500B: Select HEAD CAL, Other, 50
Ω
/1 M
Ω
Ratio. For Target 1, this screen
requires entry of two Measurement values for the DC function - Target 1.1 and
Target 1.2. Repeat this process for Target 2 and the values Target 2.1 and 2.2.
erw242.eps
Figure 24. 50-
Ω
/1 M
Ω
Ratio Calibration — Interconnections
Table 46. 50-
Ω
/1 M
Ω
Ratio Calibration Points
Meas. Point
Target Voltage
Waveshape
DC Voltage
Measurement
Target Name
Target 1.1
5.0000 V
DC
Amp @ 1 M
Ω
Target 1.2
5.0000 V
DC
Amp @ 50
Ω
Target 2.1
5.0000 Vpk-pk
Square
Amp @ 1 M
Ω
Target 2.2
5.0000 Vpk-pk
Square
Amp @ 50
Ω
