Avtech 14258 Скачать руководство пользователя страница 21 | Manualshive

Страница: 21 / 48

Avtech 14258 Скачать руководство пользователя страница 21

The pulse repetition frequency (when in the internal mode) of the output can be varied

with front panel controls or via the GPIB or RS-232 computer interfaces.

The pulse width and delay settings are shown on the front panel, but they are not

adjustable.

TRIGGER MODES

This instrument has four trigger modes:



Internal Trigger: the instrument controls the trigger frequency, and generates the

clock internally.



External Trigger: the instrument is triggered by an external TTL-level clock on the

back-panel TRIG connector.



Manual Trigger: the instrument is triggered by the front-panel “SINGLE PULSE”

pushbutton.



Hold Trigger: the instrument is set to not trigger at all.

These modes can be selected using the front panel trigger menu, or by using the

appropriate programming commands. (See the “Programming Manual for -B

Instruments” for more details.)

GATING MODES

Triggering can be suppressed by a TTL-level signal on the rear-panel GATE connector.

The instrument can be set to stop triggering when this input high or low, using the front-

panel gate menu or the appropriate programming commands. When gated, the output

will complete the full pulse width if the output is high, and then stop triggering. Pulses

are not truncated.

21

«
...
19
20
21
22
23
...
»

Содержание 14258

Страница 1: ...ITCHING TIME SERIAL NUMBER 14258 A V T E C H E L E C T R O S Y S T E M S L T D N A N O S E C O N D W A V E F O R M E L E C T R O N I C S S I N C E 1 9 7 5 info avtechpulse com http www avtechpulse com...

Страница 2: ...all at its option repair or replace said defective item This warranty does not apply to units which have been dissembled modified or subjected to conditions exceeding the applicable specifications or...

Страница 3: ...ING 10 INSTALLATION 11 VISUAL CHECK 11 POWER RATINGS 11 CONNECTION TO THE POWER SUPPLY 11 PROTECTION FROM ELECTRIC SHOCK 12 ENVIRONMENTAL CONDITIONS 13 FUSES 14 AC FUSE REPLACEMENT 14 DC FUSE REPLACEM...

Страница 4: ...TRIGGER DAMAGE 37 WIRING DIAGRAMS 38 WIRING OF AC POWER 38 PCB 158R6 LOW VOLTAGE POWER SUPPLY 39 PCB 168C HIGH VOLTAGE DC POWER SUPPLY 40 PCB 201C SAFETY INTERLOCK 41 PCB 241F SECONDARY PULSE WIDTH O...

Страница 5: ...rse bias pulse of V2 7 5 to 84V is capacitively coupled to the mainframe output This generates a current of IR IF V2 50 approximately 1A maximum approximately The forward to reverse switching time is...

Страница 6: ...memory to store up to four complete instrument setups The operator may use the front panel or the computer interface to store a complete snapshot of all key instrument settings and recall this setup...

Страница 7: ...5 Volts 10 ns or wider TTL Gate input Active high or low switchable Suppresses triggering when active Power requirements 100 240 Volts 50 60 Hz Dimensions H x W x D 100 mm x 430 mm x 375 mm 3 9 x 17...

Страница 8: ...g Also check that your load is adequately shielded It may be necessary to enclose the load in a metal enclosure If any of the connectors on the instrument are unused they should be covered with shield...

Страница 9: ...tion of conformity is issued under the sole responsibility of Avtech Electrosystems Ltd Specifically products manufactured do not contain the substances listed in the table below in concentrations gre...

Страница 10: ...9 have been made Requirements for WEEE compliance may include registration of products with local governments reporting of recycling activities to local governments and financing of recycling activiti...

Страница 11: ...ction for information about the appropriate AC and DC fuses This instrument is an Installation Category II instrument intended for operation from a normal single phase supply CONNECTION TO THE POWER S...

Страница 12: ...ROM ELECTRIC SHOCK Operators of this instrument must be protected from electric shock at all times The owner must ensure that operators are prevented access and or are insulated from every connection...

Страница 13: ...s instrument is intended for use under the following conditions 1 indoor use 2 altitude up to 2 000 m 3 temperature 5 C to 40 C 4 maximum relative humidity 80 for temperatures up to 31 C decreasing li...

Страница 14: ...the fuses on the rear panel are shown in the figure below AC FUSE REPLACEMENT To physically access the AC fuses the power cord must be detached from the rear panel of the instrument The fuse drawer ma...

Страница 15: ...Nominal Mains Voltage Rating Case Size Recommended Replacement Part Littelfuse Part Number Digi Key Stock Number 1 2 AC 100 240V 0 5A 250V Time Delay 5 20 mm 0218 500HXP F2416 ND 3 DC N A 1 0A 250V Ti...

Страница 16: ...to re enable the output i e light green for abOUT1 second If the overload condition persists the output will be disabled again i e light yellow for another 5 seconds If the overload condition has been...

Страница 17: ...ten If one of the adjustable numeric parameters is displayed and this parameter can be both positive or negative this changes the sign of the parameter EXTRA FINE This changes the step size of the ADJ...

Страница 18: ...e instrument This input can be either active high or active low depending on the front panel settings or programming commands The instrument triggers normally when this input is unconnected When set t...

Страница 19: ...This Ethernet connector allows the instrument to be remotely controlled using the VXI 11 3 ssh secure shell telnet and http web protocols See the Programming Manual for B Instruments for more details...

Страница 20: ...circuit in the BASIC AMPLITUDE CONTROL section for for details about R1 and C2 After 80 us V1 has reached a stable voltage and the SYNC output pulse is generated to allow triggering of oscilloscopes S...

Страница 21: ...onnector Manual Trigger the instrument is triggered by the front panel SINGLE PULSE pushbutton Hold Trigger the instrument is set to not trigger at all These modes can be selected using the front pane...

Страница 22: ...above is 50 2 25 Thus the voltage at the jig output is simply given by VOUT IDUT RA RC VOUT IDUT 25 where IDUT is the current through the device under test This is the key equation for relating the ob...

Страница 23: ...r example IREVERSE IFORWARD 2 Some Schottky diodes have negligible amounts of stored charge resulting from the forward bias compared to non Schottky devices For these Schottky diodes the reverse trans...

Страница 24: ...with the incorrect orientation i e with the anode and cathode reversed However incorrect waveforms will be generated ACCESSIBLE VOLTAGES The mainframe provides pulsed voltages of up to 120V or 90V to...

Страница 25: ...Both must be used to connect to the two OUT connectors on the rear panel of the mainframe AVX TRR NXPB SOD123W TEST JIG One AVX TRR NXPB SOD123W test jig is normally supplied with the mainframe unles...

Страница 26: ...will raise the nylon screw over the DUT area on the right Using tweezers position a DUT in the cavity of the raised circuit boards Slots are provided for tweezer access The DUT will rest on two sprin...

Страница 27: ...ce in the cavity It is possible to use a screwdriver to adjust the positioning of the nylon screw This will vary the maximum mechanical pressure applied to the DUT The lever should snap into place whe...

Страница 28: ...D128 The AVX TRR NXPB SOD128 is mostly identical to the AVX TRR NXPB SOD123W described above except the dimensions of the DUT cavity are slightly different It accepts SOD128 packages rather than SOD12...

Страница 29: ...instrument TYPICAL RESULTS CMMR1S 02 The Central Semi CMMR1S 02 is a 1A 200V SOD123F fast recovery rectifier With the amplitudes set to 107V and 83V actual DUT current of 0 5A and 1A observed The full...

Страница 30: ...div The reverse recovery transient is clearly visible now Zooming in further with a very high bandwidth oscilloscope gives 50 mV div 40 dB 25 200 mA div 5 ns div The tRR recovery time to 10 of IRMAX w...

Страница 31: ...To verify the 1 5 ns switching timing we use different oscilloscope measurements This waveform shows that the 0 5A to 1A switching time 10 90 is 0 77 ns 31...

Страница 32: ...coaxial cables connecting the test jig to the output module should normally be 2 meters in length 3 Keep device lead lengths as short as possible to minimize parasitic inductance 4 The test jig lid mu...

Страница 33: ...te rst resets the instrument trigger source hold turns off all triggering output on turns on the output volt ampl1 20 sets the positive pulse amplitude to 20 V volt ampl2 30 sets the negative pulse am...

Страница 34: ...tion EVENt query only always returns 0 CONDition query only always returns 0 ENABle numeric value implemented but not useful QUEStionable EVENt query only always returns 0 CONDition query only always...

Страница 35: ...RST no query form SRE numeric value STB query only TST query only WAI no query form 35...

Страница 36: ...factory for repair Service is to be performed solely by qualified service personnel Caution High voltages are present inside the instrument during normal operation Do not operate the instrument with t...

Страница 37: ...s recommended TRIGGER DAMAGE The rear panel TRIG input used in the external trigger mode is protected by a diode clamping circuit However the protection circuit is not foolproof and it is possible for...

Страница 38: ...WIRING DIAGRAMS WIRING OF AC POWER...

Страница 39: ...PCB 158R6 LOW VOLTAGE POWER SUPPLY...

Страница 40: ...PCB 168C HIGH VOLTAGE DC POWER SUPPLY...

Страница 41: ...PCB 201C SAFETY INTERLOCK...

Страница 42: ...PCB 241F SECONDARY PULSE WIDTH OR DELAY CONTROL...

Страница 43: ...PCB 228D OP AMP LEVEL SHIFTING...

Страница 44: ...PCB 104H KEYPAD DISPLAY BOARD...

Страница 45: ...MAIN WIRING...

Страница 46: ...STANDARD TEST JIG WIRING AVX TRR NXPB SOD123W...

Страница 47: ...TEST JIG WIRING AVX TRR NXPB SOD128...

Страница 48: ...PERFORMANCE CHECK SHEET 48...

Отзывы:

Нет отзывов