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Service Information

4-6

4.4.4 Offset current tests

Offset current tests check leakage current from high (HI) to
guard (L) chassis (common mode) and from high (HI) and
guard (L) (differential) for each pathway. These tests are per-
formed by measuring the leakage current with an electrome-
ter. In the following procedure, the Model 6517 is used to
measure leakage current.

Referring to Figure 4-3, perform the following procedure to
check offset current:

1. Remove all power from the switching matrix and

switching matrix cards.

2. Install the matrix card in the Model 708 or in slot 1 if us-

ing the Model 707.

3. Connect the Model 6517 to ROW A of the matrix card

as shown in Figure 4-2.

Figure 4-2

Path resistance testing

2 0 0 0 M U L T I M E T E R

A

B

C

D

E

F

G

H

1

3

4

5

6

7

8

9

10

11

12

2

Model 7077

Model 2000

H

G

H

G

H

G

H

G

H

G

H

G

H

G

H

G

Jumpers

Ohms Sense HI

Ohms HI

Ohms LO

Ohms
Sense LO

(Measure 4-wire ohms)

Note : Setup shown is configured
to test the high (H) terminal
of row A through crosspoints
A1 through A12.

H

L

4. On the Model 6517, select the 200pA range, and enable

zero check and then zero correct. Leave zero correct en-
abled for the entire procedure.

5. Turn on the Model 707/708 Switching Matrix.
6. Program the Model 707/708 to close crosspoint A1.
7. On the Model 6517, disable zero check and verify that it

is <100pA. This measurement is the leakage current of
the pathway.

8. On the Model 6517, enable zero check. On the Model

707/708, open crosspoint A1.

9. Repeat steps 6 through 8 to check the remaining path-

ways (crosspoints A2 through A12) of the row.

10. Connect the Model 6517 to ROW B and repeat steps 6

through 9 to check crosspoints B1 through B12.

11. Repeat step 10 to check ROWS C through G.
12. To check differential offset current, connect the Model

6517 to ROW A as shown in Figure 4-4 and repeat steps
5 through 12.

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Содержание 7077

Страница 1: ...Instruction Manual Contains Operating and Servicing Information Model 7077 Isolated Coaxial Matrix Card 7077 901 01 Rev B 4 97...

Страница 2: ...SE THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDI RECT SPECIAL INCIDENTAL OR CONSEQU...

Страница 3: ...Model 7077 Isolated Coaxial Matrix Card Instruction Manual 1995 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Second Printing April 1997 Document Number 7077 901 01 Rev B...

Страница 4: ...he manual Addenda are num bered sequentially When a new Revision is created all Addenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual Each ne...

Страница 5: ...age is present in any unknown circuit before measuring Users of this product must be protected from electric shock at all times The responsible body must ensure that users are prevented access and or...

Страница 6: ...result in personal injury or death Always read the associated infor mation very carefully before performing the indicated procedure The CAUTION heading in a manual explains hazards that could damage...

Страница 7: ...ife CONTACT POTENTIAL 5 V per crosspoint HI to LO OFFSET CURRENT 100pA AC PERFORMANCE ZL ZS 50 100 kHz 1 MHz Insertion Loss1 0 05 dB 0 1 dB Crosstalk 65 dB 45 dB 1Excludes loss caused by DC path resis...

Страница 8: ...trix configurations 2 1 2 3 Typical matrix switching schemes 2 4 2 3 1 Single ended switching 2 4 2 3 2 Differential switching 2 4 2 3 3 Sensing 2 4 2 4 Connections 2 5 2 5 Matrix expansion 2 6 2 5 1...

Страница 9: ...ditions 4 4 4 4 2 Recommended equipment 4 4 4 4 3 Path resistance tests 4 5 4 4 4 Offset current tests 4 6 4 4 5 Path isolation tests 4 8 4 4 6 Differential and common model isolation tests 4 10 4 5 P...

Страница 10: ...le Model 707 2 14 Figure 2 15 Multiple switching matrix example Model 708 2 15 Figure 2 16 Matrix multiplexer system 2 16 3 Applications Figure 3 1 Thick film resistor network testing 3 2 Figure 3 2 F...

Страница 11: ...rame matrix expansion Model 708 2 10 3 Applications Table 3 1 Minimum input impedance Model 2000 DMM 3 3 4 Service Information Table 4 1 Verification equipment 4 4 Table 4 2 Path isolation tests 4 9 T...

Страница 12: ...lete pages with the new pages where indicated 1 5 Safety symbols and terms The following symbols and terms may be found on an instru ment or used in this manual The symbol on an instrument indicates t...

Страница 13: ...er the manual package Keithley part number 7077 901 00 The manual package includes an instruction manual and any applicable addenda 1 8 Optional accessories The following optional accessories are avai...

Страница 14: ...rosspointA10 ROWA COLUMN 10 To connect ROW E to COLUMN 10 crosspoint E10 must be closed The crosspoint assignments in Figure 2 1 View B are valid regardless of how the card is configured When installe...

Страница 15: ...E12 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 Note Crosspoint assignments of Model 7077 Matrix Card shown above apply when installed i...

Страница 16: ...Operation 2 3 Backplane Jumpers Figure 2 2 Simplified component layout...

Страница 17: ...MNS System Common Figure 2 5 Sensing example A A A A Sense HI Source HI Sense LO Source LO Source or Measure 7077 DUT H L H L ROWS COLUMNS 2 3 Typical matrix switching schemes The following paragraphs...

Страница 18: ...ng or disconnecting cables from the matrix card 2 4 Connections CAUTION To prevent damage not covered by the warranty do not exceed the maximum allowable limits of the Model 7077 Maximum signal levels...

Страница 19: ...7 has eight sets of backplane jumpers that connect the rows of the matrix card to the switching matrix backplane Model 707 switching matrix The set of backplane jumpers located in the Model 707 Switch...

Страница 20: ...and W139 identify the LO jumpers of the card These jumpers connect the LO signal paths of the card to the GUARD back plane terminals of the Model 707 or 708 Adjacent to each HI jumper identified by th...

Страница 21: ...77 Matrix Card in each would result in an 8 36 matrix Refer to paragraph 2 5 5 for infor mation on external mainframe matrix expansion for the Model 708 Switching Matrix Figure 2 9 Narrow matrix expan...

Страница 22: ...rix into the design of the matrix specific devices can be isolated avoiding direct connection with an accidental crosspoint clo sure For example a source in Figure 2 11 cannot be con nected to DUT 2 w...

Страница 23: ...matrix cards per mainframe Resulting matrix per Model 707 Switching Matrix 1 2 3 4 5 6 8 12 8 24 8 36 8 48 8 60 8 72 struction Manual for detailed information on daisy chaining Model 708 Switching Ma...

Страница 24: ...ure 2 12 Single card example A B C D E F G H Instruments DUTs DUTs Simplified Equivalent Circuit 5 H G F E D C B A 8 7 6 4 3 2 1 7077 Matrix Card 9 10 11 12 Instrumentation DUT Test Fixture BNC Cables...

Страница 25: ...ation 2 12 Figure 2 13 Multiple card system example AAA AAA AAA COLUMNS DUT Test Fixture 1 12 A H Instruments DUTs 13 24 25 36 37 48 BNC Cables Model 707 Instrumentation ROWS Simplified Equivalent Cir...

Страница 26: ...of how the Model 7077 is used with a multiplexer card Keithley Model 7075 in the same test system In this example the Model 7077 is config ured as an 8 12 matrix and the Model 7075 is configured as a...

Страница 27: ...lent Circuit DUT Slot 1 Slot 2 Slot 3 Slot 4 Slot 1 Slot 2 Slot 5 Slot 6 DUT Instruments Slave Master ROWS COLUMNS COLUMNS COLUMNS COLUMNS COLUMNS COLUMNS DUT Test Fixture COLUMNS Instrumentation BNC...

Страница 28: ...6 7 8 9 10 11 12 A B C D E F G H Master 1 2 3 4 5 6 7 8 9 10 11 12 Slave DUTs 14 Connections Instrumentation 10 Connections Simplified Equivalent Circuit Master Slave IN OUT Cables Model 708 Master M...

Страница 29: ...Jumpers Backplane Jumpers Model 7075 Model 7077 Instrument 1 Instrument 2 1 12 1 12 H 1 12 1 12 1 12 1 12 1 12 1 12 1 12 1 12 24 Lines 24 Lines Model 7077 Model 7075 24 Lines 24 Lines Note 7075 Config...

Страница 30: ...wing 90 three element thick films to be tested The Model 708 Switching Matrix accommodates one Model 7077 Matrix Card Daisy chaining five Model 708s expands the system to five matrix cards allowing up...

Страница 31: ...Output Common Source V Ohms Sense HI Volts Ohms LO Ohms Sense LO TF 1 TF 2 TF 3 Model 7077 8X12 Matrix Sense Output Sense Common Measure V or 4 terminal Figure 3 2 Four terminal measurement 2 0 0 0 M...

Страница 32: ...four terminal connections are made at the Mod el 2000 and the resistor networks the sense leads are inter nally disconnected from the input of the DMM when the volts function is selected The simplifie...

Страница 33: ...IM E T E R Model 2000 HI LO Output Common AAA AAA AAA AAA Model 230 Measure V Source V H A B Model 7077 C V Model 2000 Model 230 Equivalent Circuit D L Sense Output Sense Common R 1 R 2 R 3 Thick Fil...

Страница 34: ...ecking 2 0 0 0 M U L T IM E T E R A B C D E F G H 1 3 4 5 6 7 8 9 10 11 12 2 Model 7077 Matrix Card Volts LO Common Output AAA AAA AAA Model 224 Volts HI Amps HI HI LO Model 2000 AAA AAA AAA Model 230...

Страница 35: ...U L T IM E T E R Volts HI Volts LO 1 2 3 4 H H A B Model 7077 H H E F H H C D H G H G H G H G L L L L L L H G L H H L AAA AAA AAA Model 224 Model 2000 AAA AAA AAA Model 230 Measure V or I Source V Sou...

Страница 36: ...it and used to measure emitter current and base to emit ter voltage Notice that external connection changes are not required All connection changes are accomplished by con trol of matrix crosspoints C...

Страница 37: ...1 2 3 4 H H A B Model 7077 H H E F H H C D H G H G H G H G L L L L L L H G L H H L AAA AAA AAA Model 224 Model 2000 AAA AAA AAA Model 230 Measure V or I Source V Source I Amps HI Amps LO Output Common...

Страница 38: ...ts LO 1 2 3 4 H H A B Model 7077 H H E F H H C D H L H L H L H L L L L L L L H G L H H L AAAA AAAA AAAA Model 224 Model 2000 AAAA AAAA AAAA Model 230 Measure V or I Source V Source I Amps HI Amps LO O...

Страница 39: ...der repairs on the circuit board use a flux that is rosin RMA based Remove the flux from these areas when the repair is complete using Genesolve or the equivalent and clean cotton swabs Take care not...

Страница 40: ...ove cover plate and mounting screws Figure 4 1 3 Install the Matrix Card WARNING Both spring loaded panel fasteners must be secured to ensure a proper chassis ground connection between the matrix card...

Страница 41: ...PERSON NEL ONLY INSTRU MENT INTERNA LLY FUSED FOR CONTIN UED PROTEC TION AGAINS T FIRE HAZARD REPLAC E FUSE WITH SAME TYPE AND RATING LINE RATING 90 250V 50 60HZ 50VA MAX FUSE RATING 2A 250V Model 708...

Страница 42: ...6517 Model 182 Model 7025 Model 1484 100 008 20pA 200pA 1 100V source 15 2mV 0 015 Path resistance Offset current path isolation Contact potential Offset current Contact potential 4 4 Performance ver...

Страница 43: ...ctions at columns 1 through 12 as shown in Figure 4 2 8 Connect the Ohms LO and Ohms Sense LO leads from the Model 2000 to the high terminal marked H in Fig ure 4 2 of ROW A 9 Turn on the switching ma...

Страница 44: ...H G H G H G H G H G Jumpers Ohms Sense HI Ohms HI Ohms LO Ohms Sense LO Measure 4 wire ohms Note Setup shown is configured to test the high H terminal of row A through crosspoints A1 through A12 H L...

Страница 45: ...250V IEEE 488 CHANGE IEEE ADDRESS WITH FRONT PANEL MENU DIGITAL I O TRIG LINK 115V Model 4802 10 Coaxial Cable Figure 4 4 Differential offset current testing Measure Current INPUT Note Setup shown is...

Страница 46: ...On the Model 6517 select the 200pA range and release zero check 6 On the Model 6517 press suppress to cancel offset cur rent and then enable zero check 7 On the Model 6517 set the voltage source for...

Страница 47: ...USE SLOWBLOW 1 2A 90 125V 1 4A 180 250V IEEE 488 CHANGE IEEE ADDRESS WITH FRONT PANEL MENU DIGITAL I O TRIG LINK 115V Source V and measure V I Model 4802 10 Coaxial Cable Table 4 2 Path isolation test...

Страница 48: ...eck and then zero correct Leave zero correct en abled for the entire procedure 5 On the Model 6517 set the voltage source for 42V and select the 200nA current range Make sure the voltage source is sti...

Страница 49: ...S WITH FRONT PANEL MENU DIGITAL I O TRIG LINK 115V Source V and measure V I Figure 4 7 Common mode isolation testing Measure Current Note Electrometer high is connected to chassis ground Model 237 ALG...

Страница 50: ...708 so the switching matrix can determine which type of matrix card is installed in a particular slot This lets the Model 707 708 send valid configuration data to the matrix card On power up control l...

Страница 51: ...the body do not touch the pins Any printed circuit board into which the device is to be inserted must first be grounded to the bench or table Use only anti static type de soldering tools and grounded...

Страница 52: ...byte transfer sequence upon power up Low logic pulse before each byte transfer 1 79MHz clock Card identification logic pulse train on power up Remains low during power up Logic pulse train to load re...

Страница 53: ...clude the following information Card model number 7077 Card serial number Part description Circuit description if applicable Keithley part number 5 4 Factory service If the card is to be returned to K...

Страница 54: ...IN5711 CONNECTOR RELAY MINI SIGNAL REL RES 10K 5 1 4W COMPOSITION OR FILM RES 200 5 1 4W COMPOSITION OR FILM RES 47K 5 1 4W COMPOSITION OR FILM RES 11K 5 1 4W COMPOSITION OR FILM RES 5 1K 5 1 4W COMP...

Страница 55: ...HIELD TO PCB 6 32X3 8LG PHIL FLAT HD SCR FOR MOUNTING HANDLE 6 32X5 16PHIL PAN HD SEMS SCR PANEL TO PCB 6 32 PEM NUT CONNECTOR CONNECTOR BNC CONNECTOR HOUSING HANDLE REAR PANEL ASSEMBLY SHIELD BOTTOM...

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Страница 60: ...system 2 13 N Narrow matrix expansion 2 8 O Offset current tests 4 6 Operation 2 1 Optional accessories 1 2 Ordering information 5 1 P Partial matrix implementation 2 9 Parts list 5 1 Path isolation t...

Страница 61: ...nstable Will not read applied input Overload Calibration only Certi cate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measurement system...

Страница 62: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...

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