User's Manual

Adjustments

P6330 3.5 GHz Differential Probe Instruction Manua l

Offset Zero and DC CMRR

Use the following procedures to adjust t he offset zero and DC CMRR

characteristics of the probe. Due to the interaction of the two

adjustments, it may be necessary to repeat the procedure to optimize

the adjustments.

NOTE. If your oscilloscope has a probe calibration routine, clear the

probe calibrati on constants at this time.

If the offset zero is adjusted, perform a functional check of the offset

range before closing the compensation box.

1. Connect the probe tips together using the square pi n, Y-lead, and

KlipChip adapters.

2. Connect the probe as shown in Figure 18 on page 41.

3. Set the Var/0v button on the 1103 power supply to 0v (light off).

The output offset voltage is displayed on the DMM.

4. Adjust Offset Zero for 0.00 V ±3mV,displayedontheDMM.

Record the actual value.

5. Connect the probe as shown in Figure 25 on page 51. Monit or the

source voltage with the DMM.