Agilent Technologies 1141A, 1142A - page 44

44

Calibration Tests and Adjustment

Adjustment Procedure

8Center adjustment R11, HF CMRR (see following figure).

Figure 2-15

R11, HF CMRR Adjustment

9Adjust R9, HF GAIN so the Vp-p (1) measurement is the same as in step 4, within

±0.5%.

Make the adjustment slowly so the oscilloscope display has time to react to signal

averaging. Press CLEAR DISPLAY occasionally to restart averaging, which gives a

quicker indication of changes.

10 Carefully connect the probe to the test board in the position shown in the figure

below (signal to both inputs).

Figure 2-16

Signal to both inputs

11 Set the function generator output to 1.0 Vp-p.

12 On the oscilloscope, set the channel 1 sensitivity to 1.00 mV/div.

13 Adjust R11 for minimum signal amplitude as shown in Vp-p reading for

channel 1. Adjust R11 slowly and use CLEAR DISPLAY frequently to restart

averaging.

Low Frequency Response and CMRR

This adjustment sequence continues from the HF Gain and HF CMRR adjustments.

Adjust R14 and C4 for pulse response, and adjust C6 for low-frequency CMRR.

1Change the function generator settings to:

• Square wave

• 2.5 kHz

•600 mV

p-p

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 !