2

In This Chapter

Description

Performance Verification

Performance Verification

•

Recommended performance verification test equipment

•

Performance verification tests

•

Verifying the multiple channel controller

•

Verifying the RF switches

This performance verification should be done once a year, or more frequently as needed. This procedure verifies that the Agilent 85330A system meets or exceeds its published specifications. Specifications are listed in

Chapter 4, “General Information.”

If traceability to a local standards organization is required, then it can be done with this procedure. One such standards organization is the United States National Institute of Standards and Technology (NIST, formerly NBS).

This verification can be performed at the measurement system’s site, or at a service bench. The verification will verify all parts of the multiple channel system: multiple channel controller, switches, and cables. This verification does not check the performance of the measurement system’s transmitter or receiver. Use the measurement system’s manual for more information on that procedure.

85330A Multiple Channel Controller 2-1

Performance Verification

Recommended

Equipment

Table 2-1 lists the equipment that is mandatory when performing the

performance verification.

Table 2-1 Required Equipment

Qty

1

1

1

1

3

1

Item

Downloadable Driver Disk, rev A.03.00

Multimeter (20 Vdc, digital)

Digital Oscilloscope (100 MHz bandwidth

1 MHz Single-shot bandwidth)

Tee adapter (BNC male to female, female)

Cable (BNC male to male 122 cm)

Network Analyzer System

3

(50 MHz to 40 GHz

4, 5

90 dB dynamic range)

Agilent Part or Model Number

1

85330-10016

2

E2377A

54501A

1250-0781

8120-1840

8722C (Option 003)

1

Plotter or Printer

6

Torque wrench (2.4/3.5 mm @ 8 in-lb)

HP 7550A+, or LaserJet

1

8710-1765

7

1. Other part numbers or model numbers may be used if they meet the minimum requirements.

2. Included with 85330A shipment.

3. System must include vector network analyzer, test port cables, and a calibration kit.

4. A 50 MHz to 26.5 GHz network analyzer may be used if the 3.5 mm adapters are used with the microwave switches.

5. If a network analyzer is used with a frequency range less than the switches, the performance verification will only be valid over the frequency range of the network analyzer.

6. Plotter or printer must be connected to the network analyzer and oscilloscope for test documentation.

7. Use this wrench for any 2.4/3.5 /SMA mm connections in this procedure.

2-2 85330A Multiple Channel Controller

85330 System

Performance Verification

Performance Verification Test

Performance Verification Test

The following verification procedure will verify the Agilent 85330 system in two parts. The first part will verify the operation of the multiple channel controller to make sure that it is controlling the switches and the receiver correctly. The second part will check the switch’s RF performance and to make sure that they are switching correctly.

Setting Up the Equipment

Connect the 85330 system to the switch control unit using the correct local control cable. This should be set up the same way that the 85330A system is used in the measurement system (Agilent 85301B/C). Do not connect the

Switch Control Units (SCU) to their switches at this time. Do not connect the 85330A to any other instruments in the measurement system. An example of a setup is shown in

Figure 2-1 . Do not turn ON the 85330A at

this time.

Figure 2-1 An Example Performance Verification Setup

85330A Multiple Channel Controller 2-3

Digital Oscilloscope

NOTE

[CHAN]: {2}

{ON}}

{2v/Div}

{Offset: 5v}

{Coupling: DC}

{Input: 1 M

Ω

}

{Probe Ratio: 1:1}

[TRIG]:

{Trig’d}

{Edge}

{Source: 1}

{Adjust: 1v}

{ } (- Edge)

[TIMEBASE]:

{2 us/Div}

{Delay: 0}

{Reference: Cntr}

[SAVE] [1]

Performance Verification

Performance Verification Test

Set up the Agilent 54503A digital oscilloscope (or any oscilloscope) as described in the following procedure, using the same settings.

The oscilloscope setup described in the following procedure will not display a trace on the oscilloscope screen until a pulse is initiated. The oscilloscope will then hold the trace until the [CLEAR DISPLAY] is pressed.

Procedure

Turn ON the oscilloscope and press the following keys on the 54503A:

[CHAN] : {1}

{ON}

{2v/Div}

{Offset: 0v}

{Coupling: DC}

{Input: 1 M

Ω

}

{Probe Ratio: 1:1}

2-4 85330A Multiple Channel Controller

Network Analyzer

Cables

Calibration

Save Setup

Performance Verification

Performance Verification Test

Turn ON the vector network analyzer. Adjust the controls for the following setup:

Measurement Display

Display: 4 Channel

Channel 1:

Channel 2:

Channel 3:

Channel 4:

Domain:

Start Frequency:

Stop Frequency:

Number of Points:

S11

S21

S12

S22

SWR

Log Mag

Log Mag

SWR

Frequency

45 MHz

40 GHz

201

RF Source Power:

Measurement:

Maximum

Continuous

Averaging: As required

Set up the rest of the measurement display for your convenience and ease of viewing.

Connect one test port cable to Port 2 of the test set. The RF switch will be connected directly to the test set Port 1. An example of this setup is shown in

Figure 2-1, “An Example Performance Verification Setup,” on page 2-3 .

Perform a full, two port calibration at the test set Port 1, and at the end of the test port cable connected to Port 2.

Save this instrument state setup in Save/Recall register 1. It will be used later in the tests. Press:

[SAVE] {1}

85330A Multiple Channel Controller 2-5

Performance Verification

Verifying the Multiple Channel Controller

Verifying the Multiple Channel Controller

Turn-On

This portion of the verification will check the 85330 multiple channel switch controller to ensure that it is operating correctly. It will also check the

Switch Control Unit of the Agilent 85331/2 to make sure that it is switching correctly. Document the test results by plotting or printing the test instrument screens as each test is performed.

Turn the multiple channel controller ON; the following screen should appear:

Select an instrument._

SYSTEM 85330A IBASIC

(see note below)

NOTE IBASIC is only present if the IBASIC option is installed.

If you see the above display, the unit has passed its turn on tests and is working properly. If you do not see this display, load the 85330A downloadable driver files as explained in the

“Loading the Driver from a

Personal Computer” on page 1-6 .

Voltage Check

Check the voltage on the switch control unit’s OUTPUT connector. This is the connector that is used to daisy-chain the switch control units together.

The voltages are shown in

Table 2-2 . If an external power supply is used to

bias the switch control units, the supply may require some adjustment to keep the voltage within the tolerances.

Table 2-2 Switch Control Unit Voltages

Pin

E, L, V a

F, M, W, b

Voltage

+12 ±

1.8 Vdc

−12 ±

1.8 Vdc ground

2-6 85330A Multiple Channel Controller

Performance Verification

Verifying the Multiple Channel Controller

Inputs/Outputs

Figure 2-2 Switch Control Unit Output Connector Voltages

Press the following on the multiple channel controller:

[Clear Instr] [Select Instr]

You should see the following display:

Select an instrument._

SYSTEM 85330A IBASIC (see note below)

NOTE

Output Trigger Test

IBASIC is only present if the IBASIC option is installed.

This is the MAIN MENU.

The following test will determine if the rear-panel ports output the correct signals. Note that a single press on the specific {TRIGGER} key will cause a single trigger pulse. If you hold down this key, a train of trigger pulses will be outputted.

1. Connect a BNC cable between Channel 1 of the oscilloscope and the multiple channel controller rear panel BNC connector that is being tested.

2. On the oscilloscope, press:

[RECALL] [1]

3. Connect the BNC cable to the RCVR TRIG connector on the multiple channel controller, and press:

{85330A} {TRIGGER} {RCVR}

On the oscilloscope, press [CLEAR DISPLAY].

You should see a negative pulse, with an approximate width of one to three microseconds.

4. Connect the BNC cable to the SRC 1 TRIG connector on the multiple channel controller, and press:

{SRC_1}

85330A Multiple Channel Controller 2-7

Pulse Receive and

Cycle Test

Performance Verification

Verifying the Multiple Channel Controller

On the oscilloscope, press [CLEAR DISPLAY] . Set the [TIMEBASE] to {5 us/Div} .

You should see a positive pulse, with an approximate width of 10 to 14 microseconds.

5. Connect the BNC cable to the SRC 2 TRIG connector on the multiple channel controller, and press:

{SRC_2}

On the oscilloscope, press [CLEAR DISPLAY].

You should see a positive pulse, with an approximate width of 10 to 14 microseconds.

6. Remove the BNC cable from the multiple channel controller.

The following test will determine if the rear panel ports successfully sense the trigger pulses. These tests will output a train of 100 pulses.

1. Press the following on the multiple channel controller:

[Clear Instr] [Select Instr] {85330A}

2. Connect a BNC cable between the RCVR READY and RCVR TRIG connectors. Press:

[More] {TEST} {RCVR} [1] [0] [0] [Return]

If the test is successful, the RCVR menu will appear on the display. If the test fails, the following error message will appear:

-214, Trigger deadlock

3. Connect a BNC cable between the SRC1 READY and SRC1 TRIG connectors. Press:

{SRC_1} [1] [0] [0] [Return]

If the test is successful, the RCVR menu will appear on the display. If the test fails, the following error message will appear:

-214, Trigger deadlock

4. Connect a BNC cable between the SRC2 READY and SRC2 TRIG connectors. Press:

{SRC_2} [1] [0] [0] [Return]

If the test is successful, the RCVR menu will appear on the display. If the test fails, the following error message will appear:

-214, Trigger deadlock

5. Remove the BNC cable from the multiple channel controller.

2-8 85330A Multiple Channel Controller

Counter Pulse Delay

Test

Performance Verification

Verifying the Multiple Channel Controller

The following test determines if the on-board counter is operating correctly.

1. Connect BNC cables between the SRC1 TRIG, RCVR READY connectors and the oscilloscope as shown in

Figure 2-3 on page 2-10 .

2. On the oscilloscope press:

[RECALL] [1]

[TRIG] {Source 2} {Adjust: 1.5v} { } (+ E dge}

[TIMEBASE] {1 us/Div} {Delay: 4 us} {Ref: Centr}

[SAVE] [2]

3. Press the following on the multiple channel controller:

[Clear Instr] [Select Instr] {85330A} {RESET} [More] {TEST} {COUNTER}

4. Press the following on the multiple channel controller:

[4] [Return]

5. The negative edge of the displayed pulse should be 4

±

1 microseconds.

To use the scope measurement feature, press: [

∆ t

∆ v] {

∆ t Marker: ON}.

Rotate the front panel knob until the vertical marker line intersects the negative edge of the pulse. Note that the Start Marker reading will be the pulse delay. See

Figure 2-4 on page 2-10 for more information.

6. On the oscilloscope press:

[TIME BASE] {1 us/Div} {Delay: 1000 us} [CLEAR DISPLAY]

7. Press the following on the multiple channel controller:

[1] [0] [0] [0] [Return]

8. The negative edge of the displayed pulse should be 1,000

±

1 microseconds.

To use the scope measurement feature, press: [

∆ t

∆ v] {

∆ t Marker: ON}.

Rotate the front panel knob until the vertical marker line intersects the negative edge of the pulse. Note that the Start Marker reading will be the pulse delay. See

Figure 2-4 for more information.

9. On the oscilloscope press:

[TIME BASE] {2 us/Div} {Delay: 15 ms} [CLEAR DISPLAY]

10. Press the following on the multiple channel controller:

[1] [5] [0] [0] [0] [Return]

11. The negative edge of the displayed pulse should be 15

± 0.

001 milliseconds.

To use the scope measurement feature, press: [

∆ t

∆ v] {

∆ t Marker: ON}.

Rotate the front panel knob until the vertical marker line intersects the

85330A Multiple Channel Controller 2-9

Performance Verification

Verifying the Multiple Channel Controller negative edge of the pulse. Note that the Start Marker reading will be the pulse delay. See

Figure 2-4 for more information.

12. Remove the BNC cables.

Figure 2-3 Counter Pulse Delay Test Setup

Figure 2-4 15 millisecond Delay Trigger Example

2-10 85330A Multiple Channel Controller

Measurement Busy

Signal and Pulse

Width Test

Performance Verification

Verifying the Multiple Channel Controller

The following test will determine if the MEAS BUSY port output pulse width is correct. It will also test the EVENT TRIG input.

1. Connect a BNC cable between the SRC1 TRIG and EVENT TRIG connectors.

2. Connect a BNC cable between the MEAS BUSY connector and the oscilloscope channel 1.

3. On the oscilloscope press:

[TIME BASE] {10 us/Div} [CLEAR DISPLAY]

4. Press the following on the multiple channel controller:

[Clear Instr] [Select Instr] {85330A} [More] {TEST} {EVENT} [1] [Return]

5. While the measurement is cycling, observe the MEAS BUSY pulse on the oscilloscope. The pulse width should be approximately 50 microseconds.

6. If the test is successful the RCVR menu will appear on the display. If the test fails, the following error message will appear:

-214, Trigger deadlock

85330A Multiple Channel Controller 2-11

Performance Verification

Verifying the Switch Control Unit

Verifying the Switch Control Unit

This test will determine if the multiple channel controller is controlling the

Switch Control Unit and that the SCU is operating correctly. If the system has move than one SCU on a single port, then check each SCU.

1. Check to make sure that the multiple channel controller is connected to each switch control unit. An example of this setup is shown in

Figure 2-5 on page 2-13 .

2. Check each switch control unit. The Active light should be ON.

3. Press the following on the multiple channel controller:

[Clear Instr] [Select Instr] {85330A} {CLOSE}

4. Select {PORT 1} or {PORT 2} depending on the setup of your switch system.

If your system uses both PORT 1 and PORT 2, then perform the following tests for both ports: a.

Press:

{PORT 1} or {PORT 2} b.

Enter each switch control unit’s address and switch number and observe that unit’s lights. As each switch address is activated, the light should turn ON.

To enter a unit address and switch number, press:

[x] [y] [z] [Return] x = switch control unit’s address (normally 0) y = switch number to be closed (normally 0) z = switch number to be closed (0 = opens all switches)

For example, {PORT 1} [1] [0] [3] [Return] will close switch 3 in the switch control unit with address 1 that is connected to PORT 1. The switch control unit address can be found on the units label. To close switch 4, just press [1] [0] [4] .

c.

Close each switch on a module and insure that the light turns ON.

5. Perform the above test for each Switch Control Unit in the system.

2-12 85330A Multiple Channel Controller

Switch Setup

Performance Verification

Verifying the RF Switches

Verifying the RF Switches

This portion of the verification will check the switches to make sure that they are switching correctly. This portion will also test the RF performance of the switches.

1. Turn OFF the multiple channel controller before making any connections.

2. Connect each switch to its switch control unit. Use the supplied switch drive cable.

3. Connect the switch to the network analyzer. An example of this setup is shown in

Figure 2-5 . Note that all of the switch ports will be tested, so

make sure that there is enough room to connect all of the ports to the network analyzer.

4. Turn ON the multiple channel controller.

Figure 2-5 RF Switch Test Setup

85330A Multiple Channel Controller 2-13

Performance Verification

Verifying the RF Switches

RF Performance Tests

Recall the network analyzer setup that was saved earlier by pressing:

[RECALL] {1}

Perform each of the following tests on each input and output port of the switch. Check the results of each of the tests against the switch’s specifications shown in the Agilent 85331A/Agilent 85332A User’s Manual.

1. Connect the test port cable to the first switch port.

2. Close the switch path. This will turn the switch light ON on the switch control unit.

a.

Check the S11 (input match, ON).

b.

Check the S22 (output match, ON).

c.

Check the S21 (insertion loss, ON).

d. Check the S12 (reverse insertion loss, ON).

e.

Document the test results by plotting the display to a plotter or printer.

3. Open the switch path. This will turn the switch light OFF on the switch control unit.

a.

Check the S11 (input match, OFF).

b.

Check the S22 (output match, OFF).

c.

Check the S21 (isolation, OFF). Use averaging if required.

d. Check the S12 (reverse isolation, OFF). Use averaging if required.

e.

Document the test results by plotting the display to a plotter or printer.

4. Move the test port cable to the next switch port. Repeat all of the above until all switch ports are tested.

2-14 85330A Multiple Channel Controller

Jumpers

Verifying Remote Ports 1 and 2

Performance Verification

Verifying Remote Ports 1 and 2

Equipment Required

•

Jumper (see below)

•

Soldering iron

•

2 jumper wires

Figure 2-6

shows the jumper assembly that can be used to verify remote port

1 and remote port 2. Using Agilent part number 1251-8863, solder one wire from pin 6 to pin 8, and another wire from pin 7 to pin 9. A connector hood is recommended for the 9-pin connector, such as L-com (part number

SDC9AG) (http://www.L-com.com).

Figure 2-6 Jumper Assembly

85330A Multiple Channel Controller 2-15

Performance Verification

Verifying Remote Ports 1 and 2

Remote Port 1 and remote Port 2 Test Procedure

1. Download the 85330A drivers version A.03.00 or above.

2. When select instrument is displayed, press:

{85330A}, {More}, {TEST}, {More}

3. Connect the modified connector to REMOTE 1 on the rear panel and press:

{REM_1_2}

4. The display should read:

“85330A_144:REM1 0101 PASS, REM2 1100 FAIL”

5. Move the modified connector to REMOTE 2 on the rear panel and press:

{REM_1_2}

6. The display should read:

“85330A_144: REM1 1111 FAIL, REM2 0011 PASS”

2-16 85330A Multiple Channel Controller

Performance Verification

AUX 1 and AUX 2

AUX 1 and AUX 2

Pulse Test

You can output one or more 500

µ s pulses from AUX 1 or AUX 2 and measure them with an oscilloscope. The number of pulses is selectable. The pulses have a 50% duty cycle, and thus a total period of 1 ms. The amplitude of the signal is roughly 0 to 4 volts. The pulses are not perfect square waves.

The leading edge rises higher than 4 volts, then curves down to approximately 4 volts.

Measuring Pulses from

AUX 1 or AUX 2

1. Connect an oscilloscope to the AUX 1 or AUX.

2. Set the scope as necessary to view the waveform described above.

3. Press:

[Select Instr] {85330A} {

→

} {TEST} {

→

} {AUX 1} or { AUX 2}

4. The message TEST AUXn OUTPUT: # OF TESTS will appear.

5. Use the keyboard to enter the desired number of pulses. You can enter the number in units or in scientific notation: For example:

100, or

1E2

6. Press the [Return] key. The pulses will appear on the scope.

NOTE The 85330A will not perform any other functions during this test. If you enter a large number, such as 1E6, it will take a while to finish. You can abort the test by cycling line power.

NOTE To test AUX 2, use the same basic procedure as shown above.

85330A Multiple Channel Controller 2-17

AUX 1 and AUX 2

Output Voltage Test

When Finished with

All Tests

Performance Verification

AUX 1 and AUX 2

The following test will determine if the rear panel ports successfully output the correct DC switch drive levels.

1. On the oscilloscope press:

[RECALL] [1]

[TRIG] {AUTO}

[CLEAR DISPLAY]

2. Press the following on the multiple channel controller:

[Clear Instr] [Select Instr] {85330A}

3. Connect a BNC cable between the AUX 1 connector and channel 1 of the oscilloscope.

a.

Press:

{CLOSE} {AUX1} {0} or [f1]

The oscilloscope should show a trace of about 0 Vdc.

b.

Press:

{1} or [f2]

The oscilloscope should show a trace of about 4 Vdc.

4. Connect a BNC cable between the AUX 2 connector and channel 1 of the oscilloscope.

a.

Press:

[Clear Instr] {CLOSE} {AUX2} {0} or [f1]

The oscilloscope should show a trace of about 0 Vdc.

b.

Press:

{1} or [f2]

The oscilloscope should show a trace of about 4 Vdc.

All of the performance verification tests are now complete. Reconnect the

85330A system in the original measurement system configuration. Refer to

Chapter 1, “Installation” for more information.

2-18 85330A Multiple Channel Controller