Wavecrest DTS-2077 Handbuch

Calibration Procedure for the DTS-2077

Time Measurement System

WAVECREST Corporation

WAVECREST Corporation continually engages in research related

to product improvement. New material, production methods, and

design refinements are introduced into existing products without notice

as a routine expression of that philosophy. For this reason, any current

WAVECREST product may differ in some respect from its published

description but will always equal or exceed the original design

specifications unless otherwise stated.

WAVECREST Corporation

A Technologies Company

7275 Bush Lake Road

Edina, Minnesota 55439

(612) 831-0030

(800) 733-7128

www.wavecrestcorp.com

TABLE OF CONTENTS

Equipment Required ........................................................................................ 1

1.0 Removal of System Top and Bottom Covers .................................................. 1

2.0 Power Supply Checks ...................................................................................... 2

Reference Voltage Check ................................................................................ 3

3.0 100MHz Oscillator Check .............................................................................. 4

4.0 Self Calibration................................................................................................ 4

5.0 Reference Voltage Operational Check ............................................................ 5

6.0 Calibration Signal Outputs .............................................................................. 5

7.0 AC Performance Checks ................................................................................. 6

8.0 Arming and Gating Checks ............................................................................. 7

9.0 Shutting Down the DTS System...................................................................... 8

Request for Notification of Future Procedure Updates ................................... 9

WAVECREST Corporation

DTS-2077 Calibration Procedure (17 April, 1998)

CALIBRATION PROCEDURE FOR DTS-2077

TIME MEASUREMENT SYSTEM

Equipment Required: 1 Frequency counter with high stability time base (9½ digit resolution)

1 Digital voltmeter (6½ digit resolution)

1 Variable output power supply (Ø-6 VDC)

3 50 ohm SMA connectorized cables of equal length (approximately

1 meter)

1 5/64" Hex wrench

1 Straight blade screwdriver, medium

1 Small, non-conductive straight blade screwdriver tool for

adjusting oscillator

1 DTS-2077 User's Guide

4 SMA shorting caps provided with the system

A/R Connector adapters as required to interface listed equipment

with SMA cables

1 Oscilloscope with 1 GHz minimum bandwidth

1 Calibrated delay line with SMA interconnects

1 Function generator with outputs to 100 KHz and a variable duty

cycle adjustment (pulse width).

1 Computer with GPIB interface and cable

1 “Virtual Instruments” -or- calibration software

Notes: 1) Use only electronic test equipment with calibrations traceable to NIST standards.

2) Refer to the DTS-2077 User’s Guide for general operating instructions.

3) For all measurements using the DTS-2077, the system’s cover should be installed and

the system should be allowed to warm-up at least 15 minutes.

4) All calibration operations should be made at a grounded workstation while wearing

a grounded strap.

1.0 Removal of the System Top and Bottom Covers

(1-1) Place the system on a sturdy horizontal surface such as a workbench. The system should

be resting on all four feet. Verify the AC power cord is not connected at this time.

(1-2) Using the Hex wrench, remove (3) screws from the left and (3) screws from the right side

panels. Then remove (15) screws from the top side.

(1-3) While slightly spreading the side panels from the bottom, lift the cover straight up until

clear of the system. Store cover and screws in a safe place.

(1-4) Turn DTS system over, so the top is resting on the workbench, and the bottom cover is

facing up.

WAVECREST Corporation

DTS-2077 Calibration Procedure (17 April, 1998)

(1-5) Using the hex wrench, remove the screws from the bottom. Store cover and screws in a

safe place.

(1-6) Turn DTS system over, so that the front panel is right side up. Then connect the AC

power cord to the rear of the DTS. Ensure that the main DTS power switch and front

panel standby switch are both off.

CAUTION: With the cover removed for servicing, there are areas of exposed AC voltage at the

power supply terminal blocks and in the area of the fans. To avoid exposure to

these hazardous voltages, use extreme caution making adjustments to the power

supplies with the power on.

Note: The DTS-2077 system is most accurate when the system temperature has reached a

stable condition. The system should be allowed to warm up with the power "ON"

for at least 1 hour prior to beginning the calibration procedure. The power should

be left "ON" as often as possible throughout the calibration.

2.0 Power Supply Checks

(2-1) Verify the AC power cord is connected to an appropriate power source (110V/60 Hz) or

(230V/50 Hz). Turn on the main power switch at the rear of the system. Then turn on the

standby switch on the front panel. Verify the display illuminates, both fans are blowing

air OUT of the system, and the system initiates its self test routine.

Make the following measurements referenced to chassis ground and adjust the power

supply outputs if necessary.

Record the following voltage readings on the test data record (before and after

adjustment).

(2-2) Using the voltmeter, measure the (+OUT) output of the +15VDC power supply (orange

wire) at connector J2, shown in Figure 1A. Verify the voltage is +15VDC ±0.15V. If

necessary, adjust +15VDC at VOUT on the ±15V module.

(2-3) Using the voltmeter, measure the (-OUT) output of the ±15VDC power supply (blue

wire) at connector J2, shown in Figure 1A. Verify the voltage is -15VDC ±0.15V. If

necessary, adjust -15VDC at OVP on the ±15V module.

(2-4) Using the voltmeter, measure the (+OUT) output of the +24VDC power supply (yellow

wire) at connector J2, shown in Figure 1A. Verify the voltage is +24VDC +0.24V. If

necessary, adjust the +24VDC supply.

WAVECREST Corporation

DTS-2077 Calibration Procedure (17 April, 1998 ) 3

(2-5) Using the voltmeter, measure the (+OUT) output of the +5VDC power supply(re d wire)

at TP5 on the backplane referenced to ground. Verifythe voltage is +5VDC +0.05V. If

necessary, adjust the main supplyadjustment.

(2-6) Using the voltmeter, measure -5VDC on Pin 3 of the power connector (P2) on the MSU

board (large board on bottom of DTS) as shown in Figure 1B. Verifythe voltage is -

5VDC ±0.05V. If adjustment is required, both -5VDC modules must be alternately

adjusted at VOUT. The two -5VDC modules provide load sharing, and must be balanced

to provide optimum performance.

Reference Voltage Check

(2-7) Using the digital voltmeter, probe the red and black pin jacks located on the back panel of

the DTS, verifythe DC voltage reads within ±1.1m VDC of the value recorded on the

previous calibration label. Record this value in the test data record.

J2 Filter Board

-15 VDC

+15 VDC

+24 VDC

Figure 1A

MSU Board

-5 VDC

Front of DTS

Figure 1B

WAVECREST Corporation

DTS-2077 Calibration Procedure (17 April, 1998)

3.0 100 MHz Oscillator Check

(3-1) Connect one SMA cable to the l00 MHz reference clock output at the back of the unit.

Connect the SMA cable to the frequency counter (50 ohm input) and verify the oscillator

output is 100.0 MHz ±0.9 Hz.

If necessary, remove the screw on the top surface of the oscillator located in the front half

of the system, and use the non-conductive adjustment tool to change the oscillator

frequency. (Clockwise adjusts the frequency down.) Allow frequency to settle for one to

two minutes before readjustment.

(3-2) When adjusted properly, install screw into oscillator. Re-install top and bottom covers,

but do not put screws in the top cover at this time. Allow system to run for one hour

before proceeding.

(3-3) Repeat the oscillator check and verify the oscillator output is 100 MHz ±0.9 Hz before

proceeding. When ready to proceed, install the screws in the top cover.

4.0 Self Calibration

Note: The (4) shorting caps and (2) 36” SMA cables provided with the system will be used

in the following steps.

(4-1) Initiate an internal calibration sequence by pushing the INT CAL button on the front

panel. The display will indicate the time remaining to accomplish the internal calibration,

counting down on the display. When the countdown reaches 0 seconds, the display will

change to: CALIBRATED. The previous mode and display then returns.

(4-2) Press the EXT CAL button on the front panel. The display will direct the user from the

front panel. Both the DC and AC calibrations should be done at this time. Follow the

instruction prompts on the front panel display. DO NOT use shorting caps on the CAL1

or CAL2 output connectors. Use only on CH1, CH2, ARM1 and ARM2 connectors.

When the instrument completes its calibration sequence, the DTS will display

CALIBRATED. The previous mode and display then returns.

(4-3) With the DTS connected to a computer, use the “Virtual Instruments” software or

calibration software to first perform the DTS connect sequence over the GPIB interface,

then perform the STROBE CAL operation. Follow the instructions on the computer

display. When the strobe calibration has completed successfully, exit the program and

disconnect the GPIB interface.

This completes the calibration portion of this procedure. The remaining steps are performance

verification steps to ensure the system is operating properly.

WAVECREST Corporation

DTS-2077 Calibration Procedure (17 April, 1998)

5.0 Reference Voltage Operational Check

(5-1) Using the voltmeter, set the power supply for each value shown in Table 1. Then remove

the voltmeter and connect the power supply to the DTS CH1. Press the "FUNC" key to

perform a pulse find operation. The displayed voltages at Menu #15 for CH1 should be

between the values shown in Table 1.

Table 1. Input Voltage Correlation

Selected Voltage Min Reading Max Reading

-1.000V -1.0025V -0.9975V

-0.250V -0.2522V -0.2478V

-0.025V -0.0271V -0.0229V

+0.025V +0.0229V +0.0271V

+0.250V +0.2478V +0.2522V

+1.000V +0.9975V +1.0025V

(5-2) Repeat for CH2.

Note: Depending on the power supply drive capability, the 50 ohm input impedance of the

DTS may result in slightly lower readings on the DTS display. It may be necessary to

measure and set the DC voltage at the DTS input connectors using a “T” adapter.

6.0 Calibration Signal Outputs

(6-1) Using the frequency counter and the oscilloscope and BNC-SMA adapter, if required,

measure the outputs of both the CAL1 and CAL2 connectors. Verify the outputs are:

2.0Vpp ± 0.2V

200 MHz ± 200 Hz

Note: It is necessary to terminate both CAL outputs to 50 ohms when measuring outputs.

This can be done by measuring one channel while externally triggering from the

other output channel.

(6-2) Connect the CAL1 to the CH1 channel, and the CAL2 to the CH2 channel using the SMA

coax cables.

(6-3) Go to Menu #9 (see Figure 2-6 in the User's Guide) and change MEASURE to ON. Then

press the BURST button on the front panel. The display will read: Subsequent cables

will use this cable arrangement as a reference. To verify this, press BURST again.

The value displayed should be less than two picoseconds.

WAVECREST Corporation

DTS-2077 Calibration Procedure (17 April, 1998)

(6-4) Place the delay line between the CH1 input and the SMA cable connected to CAL1.

Verify that CAL2 is connected to the CH2 input.

(6-5) Press the BURST button on the front panel. Verify the "electrical length" of the cable

delay line being measured (in picoseconds) is within ±10 psec of the calibrated length.

(6-6) Set MEASUREMENT to OFF and remove the delay line.

7.0 AC Performance Checks

This step turns on the 200 MHz calibration signal following the cable measurement step.

(7-1) Verify that CAL1 is connected to CH1 and CAL2 is connected to CH2. Press the EXT

CAL button on the front panel. The display will direct the user from the front panel.

Perform only the AC external calibration at this time. (Do not press “GO” for DC Cal.)

When the instrument completes its calibration sequence, the DTS will display

CALIBRATED. The previous mode and display then returns.

(7-2) Go to Menu #11 (see Figure 2-6 in the User's Guide) and place the cursor on the CLEAR

field. Then press FUNC. This sets up the DTS in a known defaults state.

(7-3) Go to Menu #14 and set the Number of Readings (sample size) to l0,000, SETS to l, and

press CONT. Then go to Menu #1.

(7-4) With the TRIG field set to 50%-50%, scroll through the various measurement options

shown below and record the measurements. Verify JITTER (JTrms) measures <6ps

(>2KHz for frequency). Then connect CAL1 to CH2 and CAL2 to CH1. Scroll through

the various measurement options shown below and record the measurements. Average

the two sets of measurements recorded for each measurement option. The average should

be within the limits shown below.

*Both Channels

TPD++ 0.000 psec ±10 psec

TPD-- 0.000 psec ±10 psec

TPD+- 2500.000 psec ±10 psec

TPD-+ 2500.000 psec ±10 psec

PW+* 2500.000 psec ±10 psec

PW-* 2500.000 psec ±10 psec

PERIOD* 5000.000 psec ±10 psec

FREQ* 200.0 MHz ±1 KHz

WAVECREST Corporation

DTS-2077 Calibration Procedure (17 April, 1998)

(7-5) Scroll to TT+ and press FUNC. The TT+ and TT- measurements for both input channels

are now set for 10%-90% trigger levels and should read between 1400 psec and 1500

psec.

Note: When selecting Channel 2 in step (7-5), it will be necessary to press FUNC to

perform a pulse find measurement on Channel 2 to get the proper results.

8.0 Arming and Gating Checks

(8-1) Connect CAL2 to the ARM1 input channel. Connect CAL1 to the delay line and the

delay line to the CH1 input channel.

(8-2) At Menu #1, select PERIOD, CH1, TRIG = 50%-50%. Select AUTO ARM and

CONTINUOUS mode on the front panel, and press FUNC. Verify the displayed

measurement is 5000 psec ±10 psec with JITTER <6 psec.

(8-3) Set the function generator to output a square wave with a 5 nsec wide duty cycle, and a

1V pk-pk signal at 1 KHz.

(8-4) Select EXTERNAL ARMING on ARM2 mode. Verify sample size = 10,000.

(8-5) Connect the CAL1 to the CH1 input channel and CAL2 to the CH2 input channel.

Connect the output of the function generator to the ARM2 input. Go to Menu #3 and set

GATE = “ON H”. Then press CONTINUOUS.

(8-6) Determine the approximate amount of time it takes the DTS to obtain l0,000 samples.

This can be done by watching Menu #16. Then change the gating duty cycle on the

function generator from 5 nsec to 2 nsec. The time to obtain the 10,000 samples should

now be more than twice as long.

(8-7) Remove all test equipment and cabling from the DTS.

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