Keithley 199 - Page 121

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Input

3.84MHz

l Clock

I

U43D

) ND Counts Output

D

Final Slope Comparator

R60

U7,

‘J6.

Fi8

--

,111

017

Duty Cycle

Comparator

D-

U5A

“-vi

Feedback

control

Circuit

*

R9B

R62

u45c

1.

1OVR

Figure 5-6. A/D Converter Simplified Schematic

5-9

Table of Contents

Table of Contents11
SECTION L-General Information20
- Features20
Warranty Information20
Manual Addenda Manual Ai20
Specifications21
Inspection21
- Manual21
Getting Started21
Accessories22
SECTION 2-Basic DMM Operation23
Introduction23
- Linepower23
Powerupsequence23
Default Conditions23
Front Panel Familiarizaxton25
Display and Indicators25
Controls26
Model 199 Rear Panel27
CAL LOCK Switch27
Inputswitch27
Connectors and Terminals28
- Line Voltage Aspects28
IEEE-488 Connector28
- Scanner Card Slot. T28
- Display Messages28
- Error Messages28
BASICMEAS-Ijrements29
Warmupperiod29
- Zero29
DC Voltage Measurements32
Low-Level Measurement Considerations32
- Resistance Measurements33
- Two-Terminal Resistance Measurements33
- Four-Terminal Resistance Measurements33
- Resistance Ranges33
- TRMS AC Voltage Measurements34
Dbmeasurements35
Corresponding Voltage Reference Levels for Impedance References36
Trmsconsiderations36
Comparison of Average and TRMS Meter Readings37
- Db Applications38
- DMM Setup PROGRAMS38
- Softwarerevisionlevei39
- Multiplexer, Autozeroical39
- Scanner Connections46
- Voltage Test Connections49
- Amplifier Gain Test Configuration57
- Typical Minimum Usable Scan Intervals60
- Section 3-Ieee-48865
- IEEE-488 Connector66
- Section 3-Ieee-48866
- Model 199 Interface Function Codes67
- BASIC Statements Necessary to Send Bus Commands68
- Factory Default Conditions72
- SDC (Selective Device Clear)73
- GET (Group Execute Trigger)73
- Device-Dependent Command Summary76
- Range(R)77
- Scanner Programming Commands. _77
- Zero(Z)78
- Filter (I')78
- Triggermode80
- Reading Mode (B)80
- Data Store Interval(Q) and Size (I)80
- Value (V) and Calibration (C)81
- Defaultc&Ditions(L)82
- Data Format (G)82
- SRQ Mask (M) and Serial Poll Byte Format83
- SRQ Mask and Serial Poll Byte Format84
- EOI and Bus Hold-Off Modes (K)85
- Terminator (Y)86
- Status(U)86
- Auto/Cal Multiplex (A)89
- Trigger Delay (W)89
- Self-Test(J)90
- Hit Button (H)90
- Display(D)91
- Translatorsoftware91
- Translatoe Format92
- Wild Card ($)93
- Translator Error Messages93
- NEW and OLD94
- Combiningtranslator Words94
- Combining Translator Words with Keithley IEEE-488 Comniarids95
- Executing Translator Words A& Keithley IEEE Commands95
- Save95
- List95
- Forget96
- Bus Data Transmission96
- Times96
- Scanner Programming96
- Scanner Setup (N)99
- Pole/Ratio Mode (0)100
- Reading Interval and Delay Programming100
- Using Data Store with the Scanner101
- Testing Resistors102
- Amplifier Gain Testing105
- SECTION 4-Performance Verification108
- Introduction108
- Initialconditions108
- Recommended Test Equipment108
- Verification Procedures109
- DC Volts Verification109
- TRMS AC Volts Verifications109
- Ohms Verification110
- Connections for TRMS AC Volts Verification110
- Limits for TRMS AC Volts Verification110
- DC Current Verification111
- TRMS AC Current Verification112
- Connections for DC Current Verification112
- Connections for TRMS AC Current Verification112
- Limits for AC Current Verification112
- SECTION 5-Principles of Operation113
- Introduction113
- Analog Circuitry113
- Inputsignalconditioning113
- SECTION 5-Principles of Operation116
- Multiplexer . ~5-6120
- 28V Reference Source120
- Inputbufferamplifier120
- Controlcircuitry122
- Digitalcircuitry122
- Display Circuitry122
- Powersui'I'lies122
- Scanner122
- Switching Relays123
- SECTION 6-Maintenance124
- Introduction124
- Linevoltageselection124
- Linefuse124
- Current Fuse125
- Calibration125
- Recommended Calibration Equipment125
- SECTION 6-Maintenance125
- Environmental Conditions126
- Warm-Upperiod126
- CAL Lock Switch126
- Front Panel Calibration126
- Recommended Calibration Equipment126
- IEEE-488 Bus Calibration127
- Ieee-488127
- Calibration Sequence128
- Dcvoltscalibration128
- DC Volts Calibration129
- Resistance Calibration129
- Trmsacvoltscalibration131
- TRMS AC Volts Calibration131
- TRMS AC Current Calibration135
- DC Current Calibration135
- Disassembly Instructions136
- TRMS AC Current Calibration136
- Special Handling140
- Troubleshooting140
- Recommended Test Equipment140
- Diagnostics141
- Signal Conditioning Checks141
- Scanner Checks141
- Power Supply Checks144
- Digital Circuitry144
- Installation145
- Scannerboard Checks145
- Card Checkout146
- Relay Shield Jumper147
- ~.~~_150
- ~ T153
- ,,,._J153
- Appendix C-Ieee-488183
- IEEE Command Group187

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