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1657 RLC Digibridge®Instruction ManualFoun 1657-0120-07/B1®QuadTech, Inc., 19925 Clock Tower Place, 210 EastMaynard, Massachusetts, U.S.A. 01754Januar

1-4 INTRODUCTION

2.1 UNPACKING AND INSPECTION.If the shipping carton is damaged, ask that the carrier'sagent be present when the instrument is unpacked. Inspect t

If your line voltage is in the higher range selectable by the line voltageswitch, use a power cord of the proper rating (250 V, 15 A) that mateswith b

P-(potential, low) = Black/whiteI-(current, low) = BlackP+(potential, high) = Red/whiteI+(current, high) = RedGuard = Black/green2.5.4 The 1688-9600 E

b. Connect a suitable bias voltage source (see below)in series with the 1+ connection, basically as shown inthe diagram, with the following details.Wi

OPERATION 3-1

3.1 BASIC PROCEDURE. Figure 3-1.For initial familiarization, follow this procedure carefully. For details, refer to later paragraphs in Operation.a. B

3.2 CONNECTION OF THE DUT.3.2.1 The Integral Test Fixture.The test fixture provided on the front ledge of the Digibridge provides convenient, reliable

Each basic range is slightly more than 2 decades wide, from an R LCdisplay of 01900, with an automatic decimalpoint change between the decades, to 199

Figure 3-2. R L C basic accuracy as a percent of reading. Heavy lines (solid and dotted) represent bestchoice of range. Range 2 is dotted. Notice that

These two supplementary pages contain information of improvements or modifications notdocumented in the current manual. All references to GenRad in th

The logarithmic scales on these figures make it very easy to apply theaccuracy factors visually. For example, suppose a capacitor is being measuredon

3.5.4 Equivalent Series R for Capacitors.The total loss of a capacitor can be expressed in several ways, includingD and "ESR." To obtain equ

WARNINGTo minimize shock hazard, limit bias to 30 V. Bias voltage is present at connectors, testfixtures and on capacitors under test.Capacitors remai

4.1 INTRODUCTION.4.2 PRINCIPAL FUNCTIONS.4.1 INTRODUCTION.4.1.1 General.This instrument uses an unusual method of measurement, which is quitedifferent

4-2 THEORY

4.2.2 Frequency and Time Source. Figure 4-3.A necessary standard for accuracy is the frequency of the test signal; andequally important are the genera

5.1 CUSTOMERSERVICE... 5-15.2 INSTRU

5.1 CUSTOMER SERVICE.Our warranty (at the front of this manual) attests the quality ofmaterials and workmanship in our products. Ifmalfunction does oc

1. Instrument description: name and catalog and serialnumbers. Refer to front and rear panels.2. Part number of board. Refer to the parts lists in thi

Insignificant figures. The right-hand digit(s) of the display normally flickerand change if they are not significant for the specified accuracy of the

Page 2-1 -Power-Line ConnectionPower line switch for 115V or 230V operation has been removed, switching isautomatic for voltages between 90 -250V AC.P

5-4 SERVICE

5.5.2 Resistance Measurement Accuracy.a. Set the line voltage switch, connect the powercord, and depress the POWER button. Allow 5 minutes for warm-up

box. (Be sure this is not strapped to G.) Connect cable tip G to G of theresistance box and to the outer terminals of the capacitance box.b. Follow ch

5.6.1 Disassembly. Figures 5-1 through 5-6.Use the following procedure for access to replaceableparts and contact points used in trouble analysis.a. D

d. Remove the ribbon cable (1657-0200) from power supply (at V-J1)and main board (at C-J1). Notice that the connectors are symmetrical andreversible;

Screw K must contact etched-circuit ground. A washer is supplied(under screw head) if necessary to do so.5.6.2 Access. Figures 5-7 and 5-8.Interior lo

5.6.3 Reference Designations.Refer to Section 6 for an explanation of these designations.For example, V- T1 designates transformer number one in thepo

a mild glass cleaner, such as "Windex" (Drackett Products Co., Cincinnati,Ohio). Do NOT use a paper towel; do NOT use enough liquid to drip

5.8.2 Power Supply.Check the power supply (V assembly) if there is a massive failure(nothing works) or as a starting procedure in any thorough analysi

they will fit the socket directly.) Check at U12 pin 4 for a1-kHz noisy sine wave, 0.4 V pk-pk. If this is verified butstep g is not, fault is in U18.

Environment: TEMPERATURE: 0° to 50°C operating, -40° to +75°Cstorage. HUMIDITY: 0 to 85% R.H., operating.Supplied: Power cord, axial-lead adaptors, in

p. While monitoring U14 pin 2, push the FREQUENCY pushbutton andselect 120 Hz, (or 100 Hz). Check thatthe monitored signal (which should always be 256

Also, the amplitudes of the staircases depend on the RANGE selectedand the impedance components of the DUT. The chosen conditionsmake 1 staircase tall

5-16 SERVICE

a. Look at the following control signals with a scopeand compare them with the timing diagram:PBST, at C-U33 pin 10;PMSR, at U33 pin 12.If they are no

c. If the feedback signals are present, look at each of the followingcontrol signals and compare it with the timing diagram: (The first 4 signalshave

Parts Lists and Diagrams- Section 66.1 GENERAL . . . . . . . . . . . . . . . . .6.2 REFERENCE DESIGNATIONS . . . . . . . . . .6.3 DIAGRAMS. . . . . .

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SERVICE POLICYQuadTech policy is to maintain product repair capability for a period of five (5) years after originalshipment and to make this capabili

Table of Contents

1.1 PURPOSE 1-11.2 GENERAL DESCRIPTION 1-11.3 CONTROLS, INDICATORS, AND CONNECTORS 1-11.4 ACCESSORIES 1-11.1 PURPOSE. in keeping with the long-life

1-2 INTRODUCTION

INTRODUCTION 1-3