Agilent Technologies E7495A RF Manuale di istruzioni

E7495A/B Manual Operation / Verification

E7495A/B Manual Verification

Manual Verification Procedures

The Manual verification procedures allow you to check out the

functionality of the major sections of the hardware that do not have

automated On-board Verification Tests.

Verifying the E7495A/B RF Functionality

Verifying the CW Source Functionality (Option 500/510 only)

Verifying the Complex Modulation Functionality (Option 510 only)

Verifying the Power Meter Functionality (Option 600 only)

BatteryManagement VerificationTests

A3 RF Functionality

E7495A/B Manual Verification

Verifyingthe E7495A/B RF Functionality

The base product of the E7495A/B consists of two main blocks: Source

and Receiver.The antenna/cable measurements use both of these blocks

and, using the Insertion Loss and Return Loss measurements, verify

the correct operation of both the source and receiver.

Test equipment

•2 - 10 dB Type-N pads (Part of E7495A/B Cal kit)

•Short Type-N cable (Part of E7495A/B Cal kit)

•6, 20, and 30 dB 849xx series Type-N pads or a 10 dB step attenuator

Insertion loss procedure

1. Press [MODE] Antenna/Cable, Two Port Insertion Loss.

2. Set the Start Frequency to 375 MHz; Stop Frequency to 2500 MHz.

3. Press Setup, Optimize and verify it is set to Accuracy.

4. Connect the two10 dB padsand a short Type-Ncable as shown in

Figure 1 on page 2.

Figure 1Connectthe10 dBpads.

A3 RF Functionality

E7495A/B Manual Verification

5. Press Frequency/Normalize and follow the instructions.

The junction of the 10 dB pads forms a calibrated plane. Measuring

unknowns or standards is performed by splitting the plane and

inserting the unknown or standard between the 10 dB pads.

6. Connect the 6 dB pad between the two 10 dB pads.

7. Use the marker function to verify that the measured value agrees

with the pad.

8. Repeat steps 6 and 7, using differentpads in order to cover the range

of 6 – 60 dB.

Return Loss procedure

1. Press [MODE] Antenna/Cable test; Return Loss.

2. Set the Start Frequency to 375 MHz, Stop Frequency to 2500 MHz.

3. Perform the open/load and short calibration.

4. Connect a 6 dB pad to the end of the cable connected to Port 1.

5. Average/Sweep turn off averaging to clear the buffer.

6. Turn on averaging.

The best and worst return loss should be between 10 and 14 dB.

If you find a failure

•Double-check your attenuators! When you stack attenuators the

overall insertion loss is slightly higher than the sum of the values.

•Check the Port 1 and Port 2 Type-N connectors for contamination,

damage, or loose connectors.

•Reload the latest firmware.

In the event of a performance failure,you must have the instrument sent in for repair.

CW Source Functionality

E7495A/B Manual Verification

Verifyingthe CWSource Functionality (Option 500/510 only)

The optional CW source uses the same internal source as is used for the

antenna cable measurements. The option adds an internal step 5 dB

attenuator to increase the output range.

Test equipment

•Spectrum analyzer

•Type-N cable

Test procedure

You will connect the source directly to the spectrum analyzer’s input

and step the CW source in 1 dB increments while reading the spectrum

analyzer’s peak marker. The value should always be within 2 dB of the

CW sources stated output.

1. Perform the RFFunctionality testprocedureon page 2.

2. Verify the step attenuator’s functionality.

On the E7495A/B

1. Press [Mode], Spectrum/Tools.

2. Press Signal Generator.

3. Set the units to Frequency.

4. Set the frequency to 375 MHz.

5. Set the amplitude step to 2 dB.

6. Set the amplitude to –25 dBm.

7. Turn the RF On.

On the Spectrum Analyzer

1. Set the frequency to 375 MHz.

2. Set the span to 10 KHz.

3. Increase the resolution BW to 1 KHz, if the update rate is very slow.

4. Set the Reference Level to –25 dBm.

5. Press Marker Peak Search.

6. While you watch the marker readout on the spectrum analyzer, step

the E7495A/B amplitude from – 25 to –89 dBm by pressing the down

arrow.

The Marker amplitude should show a 2 dB ± .5 dB change for each

press of the down arrow. Any amplitude should be within 2 dB (± the

uncertain of the spectrum analyzer used).

CW Source Functionality

E7495A/B Manual Verification

If you find a failure

•Reload the latest firmware and repeat the test.

If the test results are slightly outside the stated limits

• Verify the connectors are clean and the connections are tight. In the event of a performance failure

Complex Modulation Verification

E7495A/B Manual Verification

Verifyingthe Complex Modulation Functionality (Option 510only)

The Complex Modulation option adds a DSP and a special DAC in order

to output complex signals such as CDMA and CDMA2000. The output

of the DAC is mixed with the CW Source to set the output frequency.

The CW signal is not suppressed so you can see a signal ~60 MHz away

from the set frequency.

There are seven different waveforms that can be output in the Complex

Modulation mode. Generally, if one works, they all will.

Test equipment

•Spectrum analyzer

•Type-N cable

Test procedure

On the E7495A/B

1. Press [Mode], Spectrum/Tools.

2. Press Signal Generator.

3. Set the units to Frequency.

4. Set the frequency to 375 MHz.

5. Set the modulation to CW.

6. Set the amplitude to –50 dBm.

7. Turn the RF On.

On the Spectrum Analyzer

8. Set the frequency to 375 MHz.

9. Set the span to 2 MHz.

10.Set the reference level to –45 dBm.

11.Press Marker Peak Search.

12.Verify the amplitude of the CW signal is –50 dBm ± 2 dB.

13.On the E7495A/B, change the modulation to CDMA Forward Link

Pilot Only w/o Eq.

14.On the Spectrum Analyzer, you should see a broad spectrum signal

approximately 1.23 MHz wide.

15.Check each of the modulations available. They should all look the

same as the CDMA Forward link Pilot only.

16.Repeat steps 1 – 13 at 2.49 GHz.

Complex Modulation Functionality

E7495A/B Manual Verification

If you find a failure

•If one or more complex modulation types look correct but others

don’t, reload the latest firmware and repeat the test.

•In order to test against any limits, you must have a spectrum

analyzer that can measure channel power or a device capable of

demodulatingandmeasuringcomplexsignals.

In the event of a performance failure,you must send the instrument in for repair.

Verifyingthe Power Meter Functionality (Option 600 only)

The Power Meter option uses the same measuring hardware as the

E4418B Power Meter. The capabilities are modified for use with the

Base Station Test market.

Test equipment

•8482A power sensor and cable

Test procedure

•For a basic checkout, if you are able to zero and cal the sensor, the

circuit is functioning correctly.

If you find a failure

If the meter does not respond to any controls or the controls are grayed

out:

•Checkthat the power meter option is enabled

If the meter does not zero or calibrate check or replace the following:

•Power Sensor Cable

Battery Management Functionality

E7495A/B Manual Verification

Battery Management VerificationTests

Definition

The Battery Management Functional Test verifies the functionality of

the E7495A/B battery charge/discharge circuitry, and it’s ability to

switch between Battery and External DC Power.

The Battery Management Functional Test is a manual test. This

procedure is comprised of 4 tests to check out the Power Management

functionality:

•External DC Power Test – Verifies the Test Set’s ability to operate off

of External DC Power. During the External DC Power Test, the

operator will verify the status of the Display Icons and the Front

Panel Battery LED’s while operating on EXT DC Power.

•Internal Battery Power Test – Verifies the Test Set’s ability to

operate off of the Internal Battery(s). During the Internal Battery

Power Test, the operator will verify the status of the Display Icons

and the Front Panel Battery LED’s while operating on Battery

Power.

•Battery Charge Statistics- Verifies the Test Set’s ability to control

the charge functionality, communicate and Display the Data received

from the Battery. During this test the operator will verify the status

of the Display Icons, the Front Panel Battery LED’s, and the Battery

Statistics Screen.

•Battery Discharge Statistics – Verifies the Test Set’s ability to switch

between Batteries and control the discharge functions of the Battery

Controller board. During this test the operator will verify the status

of the Display Icons, the Front Panel Battery LED’s, and the Battery

Statistics Screen.

Battery Management Functionality

Step 3 - Verify Test Set Functionality

E7495A/B Manual Verification

If any of the above tests fail:

1. Insure the External DC Power Supply is functioning properly.

2. Insure the Battery is functioning properly, a recondition of the

battery may be necessary.

Test Equipment

AC to DC Power Supply

(supplied with E7495A/B) 0950-4404

NI2040AG Battery

(supplied with E7495A/B) 1420-0883

Battery Management Functionality

E7495A/B Manual Verification

Running the Battery Management Functional Test

NOTE When connecting or removing the Ext DC Power, the E7495A/B Test Set

can take up to 20 seconds for the Battery Status Indicators to update.

1. External DC Power Test

Setup

•Install battery into Battery Position #2 (Closest to the back of

the E7495A/B case)

•Plug the Ext DC power into the E7495A/B

•Turn the Ext DC power supply’s switch to on

•Turn the E7495A/B on and allow it to fully power-up

Test Results

•On the Front Panel Display, verify that the External DC icon

(Plug icon) is present on the lower right hand portion of the

display.

•Verify that the Battery Icons on the Front Panel Display

accurately represent the condition of the installed battery.

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