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NuMI Transition Module Calibration Procedure

By Pedro Stephens,2014-01-20 02:29
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NuMI Transition Module Calibration Procedure

    NuMI Transition Module Calibration Procedure

     Peter Prieto

     6/17/04

    This note describes the procedure required to calibrate the transition module and make it

    ready for installation in the field.

    For a description of the transition module read „NuMI transition Module Description”

    where the operation of the transition module is described in detail.

    Testing Objective

1. Verify the board has the appropriate voltages.

    2. Jumpers are in the correct location.

    3. The front panel LED‟s indicate the correct status of the board.

    4. The relay switches are set to the correct setting and they can be set with the

    appropriate control bit.

    5. Verify each channel has their designated attenuator. The document “NuMI

    transition module description” lists the attenuation each channel should have.

    6. Match the gain between sets of channels plate A and plate of a BPM. 7. Verify the input signal can be monitored at the front panel. 8. Verify the 53 MHz signal path and the 2.5 MHz signal path can be selected. 9. Inject a calibration signal and enable the calibrations relay switch. 10. Verify the calibration signal can be monitored at the front panel.

    Equipment Needed To Test the Transition Module

1. Schematic 9820-ED-370155

    2. DVM

    3. Network Analyzer

    4. Scope

    5. Splitter

    6. Signal Amplifier

    7. Dual power supply +/- 5VDC and +/-15 VDC

    8. Transition crate (if completed by testing time). If so the above power supply is

    not needed.

    9. This form to record voltages and settings for each board. 10. Calibration board to drive the following control signals onto the transition

    board

    a. CAL_ON

    b. SINGLE_A

    c. SINGLE_B 11. Switch box that connects to front panel of calibration board and in turn controls

    the three signals listed above.

    12. Cable between switch box and calibration board front panel.

Resistors That Should Not Be Soldered

Verify the following resistors are replaced with shorts before performing any tests on the

    board.

    1. R2

    2. R4

    3. R16

    4. R30

    5. R32

    6. R44

    7. R58

    8. R60

    9. R72

    10. R86

    11. R88

    12. R100

The Following Gain Setting Resistors Should BE Removed

    1. R9

    2. R15

    3. R37

    4. R43

    5. R65

    6. R71

    7. R93

    8. R99

MI60N and MI65 Input Impedance Values

The transition boards used in MI60N require that R127 and R130 be 400 Ω. The

    transition boards used for MI65 require R127 and R130 be 200 Ω.

DC Voltage Measurements

Measure the voltages +/- 5 VDC and +/-15 VDC levels on the board using a DVM.

    1. Connect power to the transition board. It should be done using the small connector

    and alternately through the DIN connector checking power can be supplied from

    either connector. Measure and record the voltages at R122, R124, R123, R125. If

    any of the voltages is not present first check the polarity of the transorbs (zener

    diodes) one or more could be in backward.

    5 VDC_______, - 5 VDC________, +15 VDC_______, -15 VDC________.

    2. Verify the front panel LED‟s are ON for all four voltages.

    Jumpers

    There are jumpers that select the voltage that power the calibration signal amplifiers

    and a set selecting the clock source for the PAL.

    1. Set the jumpers for the calibration signal amplifiers to + 5/- VDC. These are

    labeled J1, J17, J18, J19, J20, J21, J22, J23, J24, J25, J26.

    2. The jumper for the clock labeled J14 should not have connections.

    Front Panel LED’s

    With power to the board and no control bits being toggled the front panel LED‟s

    should be in the following state.

    LED‟s Status Check

    1. + 5VDC ON _________

    2. 5VDC ON _________

    3. +15VDC ON _________

    4. 15VDC ON _________

    5. D13C (53 MHZ signal path on) ON _________

    6. D13A (calibration sel. ChA) OFF _________

    7. D13B (calibration sel. ChB) OFF _________

    8. spare LED OFF _________

    Signal Path Check

Connect a 53 MHz CW 0dBm signal at the input of each cahnnel. You can use the

    network analyzer as a source.

    With scope probe check that signal is present at each of these test points

Channel A : TP2 ___ , TP1___, F.P. LEMO____, SMA______

Channel_B: TP5 ___ , TP4___, F.P. LEMO____, SMA______

Channel C: TP 8___ , TP7___, F.P. LEMO____, SMA______

Channel D: TP11 ___ , TP10___, F.P. LEMO____, SMA_____

    Attenuator Check

     Connect at the rear SMA connector a 53 MHZ signal with amplitude of 10 Volts peak-

    peak. Connect a 50 Ω load at channel output.

    With a scope probe measure the voltage at pin 2 of the LAT-6 attenuator.

Note the pad value for that channel and the measured voltage.

     Pad Attenuation Factor Vout p-p at pin 2 for 10 Vpp IN

     15 dB 0.177 1.77

     12 dB 0.251 2.51

     10 dB 0.316 3.16

    CHA Pad ______, CHB Pad_______, CHC Pad_______, CHD Pad_________

    V CHA________, V CHB________, V CHC________, V CHD__________

Gain Adjustment

This adjustment can be made several ways. One is to setup the network analyzer in CW

    mode with the center frequency at 53 MHz and 0 Hz span.

    The goal is to adjust the gain of each pair of channels Channel A and Channel B, Channel C and Channel D so a pair is as closely matched as possible.

     Channel Pad Target Value (dB)

     15 dB -27 dB

     12 dB -24 dB

     10 dB -22 dB

    1. Calibrate the network analyzer

    2. Connect PORT1 to the SMA channel input.

    3. Connect the front panel SMA channel output to PORT2.

    4. Setup the network analyzer for an S21 measurement (recall setup previously

    stored).

    5. Adjust the GAIN pot so the network analyzer CW signal matches the target value

    for the channel pad value used.

    Network Analyzer Reading :

     CHAN A____________

     CHAN B____________

     CHAN C____________

     CHAN D____________

Calibration Setup

Don‟t remove the setup with the analog source.

Connect the following control signals

CAL_ON

    SINGLE_A

    SINGLE_B

    The signals can come from the calibration board and the switch box or only the switch box connected directly into the rear DIN connector of the transition board.

    Connect the calibration signal source. The source, if possible should be the calibration board plugged into the transition chassis where the transition board is also plugged in.

Signal Path Test

This tests the relay switch that selects the 2.5 MHz signal path.

    In the following measurement the test will use the 53 MHz, CW, 0dBm source first. Measure each channel voltage at the following test points by switching the analog source from channel to channel and setting the switch box to the appropriate logic levels.

    Signal Name Action CAL_ON SINGLE_B SINGLE_A

     0 0 0

     CHAN A V TP2________LED1 ON________

     CHAN B V TP5________LED1 ON_______

     CHAN C V TP6_________LED1 ON_______

     CHAN D V TP11________LED1 ON_______ Signal Name Action CAL_ON SINGLE_B SINGLE_A

     0 0 1

     CHAN A V TP2________LED1 ON________

     CHAN B V TP5________LED1 ON_______

     CHAN C V TP6_________LED1 ON_______

     CHAN D V TP11________LED1 ON_______

    In this section verify with the 53 MHz CW, 0dBm signal ON and the signal path set to the 2.5 MHz and using the switch box that the 53 MHz signal is not seen in the 53 MHz signal path.

CAL_ON SINGLE_B SINGLE_A Action

     0 1 0

    CHAN A V TP2________LED1 OFF________

     CHAN B V TP5________LED1 OFF_______

     CHAN C V TP6_________LED1 OFF_______

     CHAN D V TP11________LED1 OFF________

     CAL_ON SINGLE_B SINGLE_A Action

     0 1 1

    CHAN A V TP2________LED1 OFF________

     CHAN B V TP5________LED1 OFF_______

     CHAN C V TP6_________LED1 OFF_______

     CHAN D V TP11________LED1 OFF________

     Now set the the signal source to 2.5 MHz, CW, 0 dBm, to be able to measure a signal through the 2.5 MHz signal path.

CAL_ON SINGLE_B SINGLE_A Action

     0 1 0

    CHAN A V TP1________LED1 OFF________

     CHAN B V TP4________LED1 OFF_______

     CHAN C V TP7_________LED1 OFF_______

     CHAN D V TP10________LED1 OFF________

     CAL_ON SINGLE_B SINGLE_A Action

     0 1 1

    CHAN A V TP1________LED1 OFF________

     CHAN B V TP4________LED1 OFF_______

     CHAN C V TP7_________LED1 OFF_______

     CHAN D V TP10________LED1 OFF________

Calibration Injection and Channel Selection Testing

    This section the signal source used will be the calibration board. The signal will be monitored at the front panel LEMO and the front panel SMA. The switch box will be used to enable the calibration signal and inject it into both channel A and B simultaneously and then only into channel A both for 53 MHz case and the 2.5 MHz case. First enable the 53 MHz CW calibration signal on the calibration board. Measure these CAL_ON SINGLE_B SINGLE_A Action

     1 0 0

     CHAN A: FP LEMO____ SMA________LED1 ON________

     CHAN B: FP LEMO_____ SMA________LED1 ON_______

     CHAN C: FP LEMO_____SMA_________LED1 ON______

     CHAN D: FP LEMO_____SMA_________LED1 ON______

CAL_ON SINGLE_B SINGLE_A Action

     1 0 1

     CHAN A: FP LEMO____ SMA________LED1 ON________

     CHAN B: FP LEMO_____ SMA________LED1 ON_______

     CHAN C: FP LEMO_____SMA_________LED1 ON______

     CHAN D: FP LEMO_____SMA_________LED1 ON______

    Disable the 53 MHz calibration signal and enable the 2.5 MHz signal at trhe calibration board. Measure these

CAL_ON SINGLE_B SINGLE_A Action

     1 1 0

    CHAN A: FP LEMO____ SMA________LED1 OFF________

     CHAN B: FP LEMO_____ SMA_______LED1 OFF_______

     CHAN C: FP LEMO_____SMA_______LED1 OFF______

     CHAN D: FP LEMO_____SMA_______LED1 OFF______

CAL_ON SINGLE_B SINGLE_A Action

     1 1 0

    CHAN A: FP LEMO____ SMA________LED1 OFF________

     CHAN B: FP LEMO_____ SMA_______LED1 OFF_______

     CHAN C: FP LEMO_____SMA_______LED1 OFF______

     CHAN D: FP LEMO_____SMA_______LED1 OFF______

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