Geräte Informationen:

Keithley 179A Digital Multimeter
Hersteller:
Keithley
Modell: 179A
Datum: 1982
Kategorie: Messgeräte
Gruppe: Digital Multimeter
Beschreibung: TRMS Multimeter
Informationen:
                                    	INTRODUCTION

The Model 179A is a precision 4 1/2 digit TRMS multimeter
useful for measurement of AC and DC voltage, AC and DC
current and resistance. Ranges and accuracies are listed in
the detailed specifications which precede this section.
Ranges and functions are selected with front panel push
buttons. The decimal point is also positioned by the
selected range push button. Polarity of the measured signal
is automatically displayed.

	FEATURES

The Model 179A includes the following features:

•	TRMS AC measurement capability gives waveform-insensitive
measurement accuracy to applications such as solid-state
regulator design, measurement of power transformer input
currents and capacitor ripple currents.

•	AC and DC CURRENT ranges allow continuous measurements of
up to 15A or periodic measurement up to 20A.

•	10µV AC and DC sensitivity

•	HI-LO Ohms. In the HI mode, enough voltage can be applied
to semiconductors to turn them on for a test. LO can be used
for in-circuit measurements without turning on semiconductor
junctions. Full-scale compliance voltage is 2V on HI, 200mV
on LO.

•	1kV protection on Ω. 1000V overload protection on ohms
eliminates accidental damage due to improper function selection.

•	Optional BCD output. The Model 1792 Isolated BCD Output
may be ordered and is field installable.

•	Optional IEEE-488 data output. The Model 1793 IEEE-488
Interface can be ordered with the unit, or can be easily
field-installed with a screwdriver, It is powered internally
from the instrument. With the interface and any of the low
cost controllers now on the market, it is possible to set up
an economical, automated test system that saves the time of
manually recording, transcribing and entering large amounts
of measurement data.

Folgende Anleitungen sind hier verfügbar:

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Dokumenttyp: Service- und Bedienungsanleitung Keithley-11208-Manual-Page-1-Picture
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SECTION 1 GENERAL INFORMATION

1.1	Introduction..........................

1.2	Features .............................

1.3	Warranty Information..................

1.4	Manual Addenda.........-............

1.5	Safety Symbols and Terms.............

1.6	Unpacking and Inspection.......-......

1.7	Optional Accessories ..................
1.8
Specifications..................................................................1-2

SECTION 2 OPERATION

2.1	Preparation for
Use..........................................................2-1

2.1.1	Line
Power....................................................................2-1

2.1.2	Battery Pack Power
....................................................2-1

2.1.3	Battery
Charging..........................................................2-1

2.2 Operating
Instructions....................................................2-1

2.2.1	Environmental
Conditions..........................................2-1

2.2.2	Front Panel Familiarization
........................................2-1

2.3	DMM Measurements
-....................................................2-3

2.3.1	DC Voltage Measurement.................................2-3

2.3.2	TRMS AC Voltage
Measurement..............................2-4

2.3.3	Resistance (HI Measurement.................. .	2-4

2.3.4	Current Measurement (DC or TRMS ACI ................2-4

2.3.5	AC and DC Measurement
..........................................2-5

SECTION 3 PERFORMANCE VERIFICATION

3.1
Introduction......................................................................3-1

3.2	Environmental
Conditions..............................................3-1

3.3	Recommended Test
Equipment....................................3-1

3.4	Performance Verification Procedure
............................3-1

3.5	Initial
Conditions..............................................................3-1

3.6	DC Volts Verification
......................................................3-1

3.7	AC Volts Verification
......................................................3-2

3.8	Resistance
Verification....................................................3-2

3.9	DC Current
Verification..................................................3-2

3.10	AC Current
Verification..................................................3-2

SECTION 4 THEORY OF OPERATION

4.1
Introduction..................................................4-1

4.2	Overall Operation
............................................................4-1

4.2.1	Signal Conditioning
....................................................4-1

4.2.2	Ohms
Conversion........................................................4-1

4.2.3	A/D Converter
................................................4-1

4.3
Attenuation......................................................................4-2

4.3.1	DC
Volts........................................................................4-2

4.3.2	AC
Volts........................................................................4-2
4.4	AC Conversion
................................................................4-2

4.5	Ohms
Conversion..........................................................4-2

4.5.1	Range
Selection......................................................4-2

4.5.2	1!
Circuit..................................................................4-2

4.6	A/D
Converter........................................................4-3

4.6.1	Auto-Zero
................................................4-3

4.6.2	Signal-Integrate . . . .	........................4-3

4.6.3	Reference-Integrate....................................4-3

4.6.4	Reference
Voltages..............................................4-3

4.7	Display
........................................................................4-4

4.8	Current
Measurements....................................................4-4

4.9	AC Power
Supply........................................................4-4

4.10	Model 1788 Battery
Pack..............................................4-4

4.10.1	Battery Charging Circuit
........................................4-5

4.10.2	Battery Operation and Shutdown Circuit
................4-5

SECTION 5 MAINTENANCE

5.1
Introduction............................................................5-1

5.2	Calibration
Procedure......................................5-1

5.2.1	Recommended Test Equipment.............	5-1

5.2.2	Environmental
Conditions..................................5-1

5.2.3	Calibration Shield Installation......................5-1

5.2.4	Calibration
Adjustments....................................5-1

5.3	Battery Pack (Model 17881 Installation
....................5-2

5.4
Troubleshooting..................................................5-2

5.4.1	Troubleshooting Procedure..........................5-3

5.5	Special Handling of Static Sensitive Devices	5-3

5.6	Battery Charge Voltage Adjustments....................5-3

5.7	Fuse
Replacement..........................................5-4
SECTION 6 REPLACEABLE PARTS

6.1	Introduction.......................

6.2	Replaceable Parts..................

6.3	Ordering Information ...............

6.4	Factory Service...................

6.5	Component Location Drawings .

6.6	Schematic Diagram..............
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