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5.1 CUSTOMER SERVICE.

Our warranty (at the front of this manual) attests the quality of

materials and workmanship in our products. If

malfunction does occur, our service engineers will assist in any way possible.

If the difficulty cannot be eliminated by use of the following service

instructions, please write or

phone the nearest GenRad service facility (see back page), giving full

information of the trouble and of steps taken to remedy it. Describe the

instrument by name, catalog number, serial number, and 10 (lot) number if

any. (Refer to

front and rear panels.)

5.2 INSTRUMENT RETURN.

5.2.1 Returned Material Number.

Before returning an instrument to GenRad for service, please ask our

nearest office for a "Returned Material" number. Use of this number in

correspondence and on a tag tied to the instrument will ensure proper

handling and identification. After the initial warranty period, please avoid

unnecessary delay by indicating how payment will be made, i.e., send a

purchase-order number.

5.2.2 Packaging.

To safeguard your instrument during storage and shipment, please use

packaging that is adequate to protect it from damage, ie., equivalent to the

original packaging. Any GenRad field office can advise or provide packing

material

for this purpose. Contract packaging companies in many cities can

provide dependable custom packaging on short notice. Here are two

recommended packaging methods.

Rubberized Hair. 

Cover painted surfaces of instrument with protective

wrapping paper. Pack instrument securely in strong protective corrugated

container (350 Ib/sq in.

bursting test), with 2-in. rubberized hair pads placed along

all surfaces of the instrument. Insert fillers between pads and container to ensure

a snug fit. Mark the box "Delicate Instrument" and seal with strong tape or metal

bands.

Excelsior. 

Cover painted surfaces of instrument with protective wrapping

paper. Pack instrument in strong corrugated container (350 Ib/sq in. bursting

test), with a layer of excelsior about 6 in. thick packed firmly against all surfaces

of the instrument. Mark and seal the box as described above.

5.3 REPAIR AND REPLACEMENT OF CIRCUIT BOARDS.

This instruction manual contains sufficient information to guide an

experienced and skillful electronic technician in

fault analysis and the repair of some circuits in this instrument. If a

malfunction is localized to one board (or more) that is not readily repairable, it

can be returned to GenRad for repair. To save time, we recommend that you

obtain a replacement first, as described below, before returning the faulty board.

Exchanges. 

For economical, prompt replacement of any etched-circuit board,

order an exchange board. Its price is considerably less than that of a new one.

Place the order through your nearest GenRad repair facility. (Refer to the last

page of this manual.) Be sure to request an exchange board and supply the

following information:

1. Instrument description: name and catalog and serial numbers. Refer to

front and rear panels.

2. Part number of board. Refer to the parts lists in this manual. (The number

etched in the foil is generally NOT the part number.)

3. Your purchase order number. This number facilitates billing if the unit is

out of warranty and serves to iden

tify the sh ipment.

To prevent damage to the board, return the defective

board in the packing supplied with the replacement (or equivalent protection).

Please identify the return with the

SERVICE 5-1

Содержание 1657 RLC Digibridge

Страница 1: ...adTech assumes no responsibility for any error or for consequential damages that may result from the misinterpretation of any procedures in this publication Contents Instruction Manual Changes Specifi...

Страница 2: ...ove fuse drawer by pressing up on release tab Ref No 3R Line voltage switch has been deleted power input is from 90 250V AC Page 1 4 Table 1 3 Accessories A quantity of two spare fuses are supplied 6...

Страница 3: ...ons Monthly more or less depending on usage the built in test fixture should be cleaned with a soft brush and isopropyl alcohol Avoid getting excess alcohol on instrument paint surfaces otherwise dama...

Страница 4: ...table Measurement Mode Measures R series or parallel L and Q series or parallel C and D series or parallel All measurement modes are pushbutton selectable Displays LED type numerical display with auto...

Страница 5: ...VICE POLICY QuadTech policy is to maintain product repair capability for a period of five 5 years after original shipment and to make this capability available at the then prevailing schedule of charg...

Страница 6: ...Table of Contents...

Страница 7: ...ptors Figure 1 shows the front panel conrols and indicators receives any common component part axial lead or radial Table 1 1 identifies them with descriptions and functions lead so easily that insert...

Страница 8: ...1 2 INTRODUCTION...

Страница 9: ...INTRODUCTION 1 3...

Страница 10: ...1 4 INTRODUCTION...

Страница 11: ...with a power connector that is in conformance with the International Electrotechnical Commission publication 320 The 3 flat contacts are surrounded by a cylindrical plastic shroud that reduces the pos...

Страница 12: ...ies See Table 1 3 BNC Adaptor 1689 9601 BNC Cable Assembly 1689 9602 or equivalent Remote Test Fixture 1689 9600 or equivalent handler or special fixture This remote test fixture functions like the on...

Страница 13: ...arly Connect the outer shield contacts to the shield or case of the DUT only if it is isolated from both ends of the DUT EXTENDER CABLE COLOR CODE RED AND RED 1 current drive to high end of DUT RED AN...

Страница 14: ...s a regulated power supply with the usual characteristic that it functions properly only as a source not a sink then the following test setup is recommended Connect across the power supply a bleeder r...

Страница 15: ...OPERATION 3 1...

Страница 16: ...is connected to one of its 2 main terminals 3 2 OPERATION Notice that the 2 red tips must connect to the same end of the DUT The terminals with white bands are potential connections with no bands cur...

Страница 17: ...s given in paragraph 3 1 To correct for cable capacitance refer to paragraph 3 7 3 3 FUNCTION AND RANGE SELECTIONS 3 3 1 Function Pushbuttons The selection of the principal parameter to be measured is...

Страница 18: ...e is a factor of 5 with 2 exceptions going from 19999 up to 99999 and finally to blank without any change in decimal point but with reduced accuracy Any measurement in the high extension of either the...

Страница 19: ...se a capacitor measured at 1 kHz has C 400 uF and D 0 5 The R LC basic accuracy is 0 4 and the R LC accuracy factor is 1 5 Therefore the accuracy of the C measurement is 0 6 Notice that the D or Q of...

Страница 20: ...o the applicable specifications If there are none known be sure to 3 6 OPERATION specify with your results whether they are parallel or series and what the measurement frequency was Resistors below ab...

Страница 21: ...er than the ohmic resistance of the wire leads and foils that are physically in series with the heart of a capacitor ESR includes also the effect of dielectric loss and is therefore dependent on frequ...

Страница 22: ...tall an adaptor GR 874 Q2 on each of the two coaxial connectors Land H of the capacitor b Connect cable branch G to the ground post of the low terminal adaptor With a clip lead or plain wire connect t...

Страница 23: ...ue The only precision Patent applied for 4 1 4 2 components in this instrument are three standard resistors and a quartz crystal stabilized oscillator There is no reactance standard For example C and...

Страница 24: ...4 2 THEORY...

Страница 25: ...driving the sine wave generator described below 4 2 3 Sine Wave Generation Figure 4 4 Starting with a digital signal at 256 times the selected test frequency the sinewave generator provides the test...

Страница 26: ...esistance be sure that grounded equipment has rubber feet or other means of insulation from the work surface The instrument or system component being serviced should be similarly insulated while groun...

Страница 27: ...placed along all surfaces of the instrument Insert fillers between pads and container to ensure a snug fit Mark the box Delicate Instrument and seal with strong tape or metal bands Excelsior Cover pa...

Страница 28: ...rrectly set for your power Iine voltage Verify performance as follows a Set the line voltage switch connect the power cord and depress the POWE R button b Press the PARALLEL SERIES button if necessary...

Страница 29: ...w Calibration of Standard The acceptable RLC readout min to max range may have to be modified if your actual Zx or Zx accuracy is different from the value tabulated For example if your 1 k standard is...

Страница 30: ...5 4 SERVICE...

Страница 31: ...fer to para 3 7 for details of connection to 3 terminal capacitors with coaxial connectors and for the determ ination of cable capacitance The corrected readout of capacitance is the actual display mi...

Страница 32: ...etails of setup and performance b For check CA the GR 1482 B inductor must be measured twice i e once with a shorting link from center to left reference terminals once with the link from center to rig...

Страница 33: ...front corners are unhooked Lift it directly upward Figure 5 1 Reassembly note 2 screws 13 mm long The next step removal of display board is recommended though not absolutely necessary before removal o...

Страница 34: ...es Be sure to enfold the pliable dirt seals at left and right sides of main chassis as you start to slide bottom shell onto main chassis use 4 screws 8 mm long h Remove 8 screws shown in Figure 5 5 as...

Страница 35: ...own to make a 1657 9700 function as a 1657 9800 or vice versa See para 3 1 for line frequency consideration Conversion involves relocating 2 jumpers and substitution of precision oscillator U7 refer t...

Страница 36: ...e 5 5 screws KL 5 10 SERVICE b Clean and check the 4 contact strips Use a card wet with isopropyl alcohol for cleaning Hold the board at an angle so that any drip falls away from the circuits c If nec...

Страница 37: ...oint may be caused by a fault in the directly associated circuit on the display board Refer to comments above Pushbutton Malfunction of any pushbutton may be caused by a fault in the switch or in buff...

Страница 38: ...nal changes amplitude as you switch ranges thus RANGE 1 0 68 V pk pk RANGE 3 20 mV pk pk d If no fault appears in steps a b c skip to para 5 8 4 e Verify that 0 25 V RMS TEST SIGNAL found at S03 pin 1...

Страница 39: ...ins 12 9 5 for similar pulses as shown with frequencies as follows Pin 12 276 or261 12 kHz Pin 9 61 440 or 78 3 kHz Pin 5 30 720 or 26 112 kHz Otherwise U10 is faulty NOTE At pin 12 for the 1657 9700...

Страница 40: ...ate signal SSW1 U39 pin 5 as a trigger for your scope Pin 3 should be a 1 kHz switched sine wave 500 to 620 mV pk pk for a few cycles while SSW1 is logic high e Similarly check at switch U39 pin 10 us...

Страница 41: ...sses all the preceding checks i e no fault can be found in the analog circuitry the fault is liable to be in digital circuitry See below 5 8 5 Control Signal Checks Figures 5 10 5 11 If there is no st...

Страница 42: ...5 16 SERVICE...

Страница 43: ...the reset pulse provided in step aa Provide reset pulses in either of 2 ways Preferably set up a pulse generator as follows Source resistance 50 Repetition rate period 1 s Pulse polarity and duration...

Страница 44: ...associated circuits 5 8 6 Digital Circuitry Display Board A faulty integrated circuit package can usually be identified by interchanging plug in component parts of the same type between display chann...

Страница 45: ...or signal flow Reference designation usage is described below 6 2 REFERENCE DESIGNATIONS Each electrical component part on an assembly is identi fied on equipment and drawings by means of a reference...

Страница 46: ......

Страница 47: ...657 7800 Matching test fixture contacts 4 required included on 1657 4700 board each 5 alt Test fixture upper assembly with squared ends of slots 1689 2000 24655 1689 2000 includes dross tray and pad...

Страница 48: ...reintm MAO2 6 6 3 7 ion Cerbidr Nw Yo L NY 001 6 6 6 4 United Csrr Fat Sorton MA 63060 inoreen C ew a d OH 44104 83743 Wed Le erd Mt ernon NY 10550 66083 Westinglvme 6loo e d N 0 003 66062 We n Newerk...

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