Agilent Technologies 1141A, 1142A - page 37

37

Calibration Tests and Adjustment

CMRR Test

7On the oscilloscope, press AUTOSCALE and set the following parameters.

8On the oscilloscope, measure the peak-to-peak voltage of the channel 1 signal,

then V P-P, then press 1) and record the reading.

Vp-p (1) = _____________ mV

9Connect the input of the probe to the test board in the position shown in the

figure below (signal to both inputs).

Figure 2-10

Signal to both input

10 Set the sensitivity to 1 mV/div.

11 After the measurement settles (averaging is complete), record the V P-P

reading.

Vp-p (2) = _____________ mV

12 Disconnect the probe amp from the test board and measure Vnoise pp on

channel 1.

13 Calculate the CMRR result as follows

14 The result in step 12 should be ≥ 3000, representing a CMRR of 3000:1 or more.

Record the CMRR in the Calibration Test Record.

Menu Selection Setting

TIMEBASE (time/div) 500 ns/div

CHAN 1 (sensitivity)

(input R)

200 mV/div

50 Ω DC

ACQUISITION Sampling Mode

Memory Depth

Sample Rate

Averaging

# of avg

Real Time

Automatic

Automatic

Enabled

32

CMRR

Vpp1

Vpp2Vnoisepp

–

-------------------------------------=

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 !