Agilent Technologies 1141A, 1142A - page 47

47

Calibration Tests and Adjustment

Adjustment Procedure

High Frequency Compensation

This adjustment sequence continues from the Low Frequency Response and CMRR

adjustment. However, it can be done separately if the probe meets all specifications

except bandwidth. Adjust R13 for unity gain at 200 MHz.

1Connect the signal generator to the test board and set it for 200 MHz and

300mVp-p (107 mVrms).

2Carefully connect the input of the probe to the test board in the position shown

in the figure below (signal to + input).

Figure 2-20

Signal to + input

3Press AUTOSCALE, then measure the peak-to-peak voltage on channel 1

(Press SHIFT (blue), press V P-P, then press 1).

4Adjust R13 (HF COMP) to make the signal amplitude measurement on the

oscilloscope 300 mVp-p, or as close to that as possible. Adjust slowly and press

CLEAR DISPLAY frequently to restart averaging.

Figure 2-21

R13 Adjustment

The minimum allowable amplitude is 212 mVp-p. Typical values will be between 275 and

325 mVp-p. the probe needs repair if the minimum cannot be reached.

Probe Reassembly

1Disconnect the probe power cable at the rear panel of the 1142A

2Remove the probe PC assembly from the test board. Be sure the probe input

connectors remain attached to the probe.

3Remove the grounding screw and ground block from the PC assembly.

Contents

Main Agilent Technologies 1141A Differential Probe and 1142A Probe Control and Power Module Page Contents Page Introduction Accessories Supplied Page Accessories Available The following accessories can be ordered. To inspect the probe To inspect the probe Using the probe with other instruments Recommended Test Equipment Setting up the probe Initial Adjustment Page Using the Accessories Page Page Page Page Grounding Coupling Functions Page Page Remote operation Cleaning Requirements Differential Amplifiers and CMRR Page Page Equipment Required Introduction Equipment Required The Test Board The Test Board Calibration Tests dc Gain Accuracy dc Gain Accuracy Page Page Vout Vin --------------Vout1Vout2 ----------------------------------= () 2 Vin Page Page Bandwidth Page CMRR Test Page Page Calibration Test Record Probe Adjustment Adjustments Probe Adjustment Page Adjustment Procedure Page Page Page Page Page Adjustment Procedure Attenuator Adapter Adjustment Attenuator Adapter Adjustment Page Page Page Page Introduction Performance Specifications and Characteristics Performance Specifications and Characteristics Page Page General Characteristics General Characteristics Theory of Operation Theory of Operation Differential Probe Control and Power Module Theory of Operation Attenuator Adapters Page Service Policy Troubleshooting Probe Troubleshooting Probe Control and Power Module Troubleshooting Page Removing and Replacing Assemblies Differential Probe Page Probe Adapters Page Probe Control and Power Module Replaceable Parts Parts List Ordering Information Direct Mail Order System Manufacturers Codes Page Page Page Page Page Page 1141A and 1142A Replaceable Parts Page Page Page Page Page Locator Table for Control and Power Supply Page Page Index Agilent Technologies P.O. Box 2197 1900 Garden of the Gods Road Notices Manual Part Number Warranty Technology Licenses Restricted Rights Legend Product Safety Notices Warnings To clean the instrument Safety Symbols !