Instructions

Operator’s Manual

H. Adjust Final Attenuator CMRR (C18A)

1. Carefully move the AP033 probe head from the Differential Drive 50 Ohm

Termination portion of the AP033 Calibration Fixture to the Common Mode Drive 50

Ohm Termination portion.

2. Remove the BNC cable from the Differential Drive 50 Ohm Termination connector of

the AP033 Calibration Fixture. Connect one end of the BNC cable to the Common

Mode Drive 50 Ohm Termination connector of the AP033 Calibration fixture.

Connect the other end of the cable to the female end of a BNC T adapter. Plug the

male connector of the BNC T adapter into the Channel 4 input of the oscilloscope.

Connect a second BNC cable to the remaining female connector of the BNC T

adapter. Connect the other end of the second BNC cable to the CAL output BNC

connector.

3. Set the oscilloscope to display Channel 4, coupling to DC1MΩ vertical scale factor to

200 mV/div and the trigger source to Channel 4. Adjust the oscilloscope trigger level

as necessary for a stable display.

4. Set the oscilloscope to display Channel 1, vertical scale factor to 10 mV/div. Set the

OFFSET to 0.0 mV

5. Adjust Attenuator CMRR (C18A) for minimum amplitude shift of the displayed

waveform at the trigger point in time. See Figure 12 for adjustment location.

6. Remove all cables, the Calibration Fixture, and the ProBus extender from the AP033

probe.

I. Assemble Probe and Amplifier

1. Carefully slide the large (2-piece) top probe tip cover over the probe tip, being careful

to engage the input pins. Engage the probe cable strain relief metal-alignment-pin

into the mating area at the rear of the top cover. Carefully dress the wires entering

the cable to clear the area.

2. Snap the lower probe tip cover onto the 2-piece top probe cover.

3. If the cover appears to not close completely, remove it and again check for adequate

clearance and proper engagement of the strain relief pin.

4. Replace the (2) screws and hand tighten.

5. Hold the Logic PCB / Amplifier PCB assembly in one hand with the Logic board facing

up. Hold the ProBus Interface metal housing in the other hand with the control side

(side with holes for the buttons) facing up.

6. Align the edges of the Amplifier PCB with the slots in the center of the inside of the

housing. (The amplifier PCB is the thicker circuit board and has the BNC connector

soldered to it.) Slide the boards into the housing being careful to align the screw

holes in the end cover with the corresponding channels in the corners of the housing.