Geräte Informationen:

Fluke 734A Netzteil
Hersteller:
Fluke
Modell: 734A
Datum: 1992
Kategorie: Messgeräte
Gruppe: Netzteil
Beschreibung: DC Reference Standard
Informationen:
                                    The Model 734A DC Reference Standard is made up of one
734A-7001 Instrument
Enclosure and four 732B DC Standards. The Model 734A-7001
can be purchased
separately as needed for your application. The enclosure
securely holds up to four 732B
DC Standards and/or 732B-7001 External Battery/Chargers
(described next).
An ac power bus inside the 734A-7001 enclosure powers up to
four 732B units with only
one ac line cord. Using the enclosure allows you to rack
mount 732Bs.


Model 732B is a dc voltage laboratory standard that produces
reference voltages of 10V
and 1.018V. Model 734A contains four 732B DC Standards in a
chassis. The 732B is
highly stable, rugged and transportable. Its 10V output
excels in stability, and can be
used as your direct link in the traceability chain to
national standards. You can use the
732B 1.018V output to transfer the "volt" at the 1.018V
level from one set of saturated
standard cells to another. You can also use the 1.018V
output as a working standard with
older equipment that requires a standard cell voltage input.
The 10V output’s long-term stability, predictable drift
rate, low uncertainty, convenient
level, and immunity to accidental damage make the 732B or
734A the preferred artifact
for maintaining a local standard of voltage. With time
characterization (Calibration
Option 732B-100) the drift rate for the 10V output is given.
This reduces the 10V output
uncertainty from 2 ppm/year to 1 ppm/year.
All outputs of the 732B can withstand short circuit
indefinitely, without damage to the
instrument or disruption of the state of calibration.
Recovery time for a momentary short
is less than 2 minutes; for an extended short, recovery time
is less than 2 hours.
To maintain calibration as a traceable standard, the 732B
must continue to receive
uninterrupted operating voltage from ac line power or from
the internal battery. If
battery voltage drops too low, the front panel IN CAL
indicator goes out and
recalibration is required.
The internal rechargeable battery (if switched on) protects
the standard from line power
interruption and provides power for hot shipment (shipment
under power). The 732B
outputs are unaffected as you change between battery or ac
line power. Battery operation
with a fully charged battery lasts at least 72 hours. You
can extend battery operation by
connecting an external 12V battery such as Model 732B-7001
to the rear panel
MONITOR/EXT BAT IN connector. Plugging the 732B into ac line
power for 24 hours
fully recharges the internal battery.
Four front panel indicators show operating status. Model
732B-7001 External Battery
and Charger has all but the IN CAL indicator.
· AC PWR lights when the 732B is connected to ac line power.
· IN CAL goes out to warn you when the 732B may have lost
its calibration. This
indicator responds to an excessively large drop in battery
voltage or a large change
in oven temperature. If battery voltage falls below the
level needed to keep the 732B
working normally, the IN CAL indicator extinguishes,
indicating a loss of the state
of calibration. Once power is restored and the output has
been verified, you can reset
the IN CAL indicator.
· LOW BAT blinks to warn you to plug the line cord into ac
power when only a few
hours of battery operation remain.
· CHARGE lights when the battery is being recharged in
constant-current charge
mode, and is off when the battery is charged to the 90%
level. At 90% of full charge,
a float charge completes and maintains full charge.

Folgende Anleitungen sind für obiges Gerät verfügbar:

Fluke -- 734A -- Service- und Bedienungsanleitung
Dateiname: Fluke-6495-Manual-Page-1-Picture
Dokumenttyp: Service- und Bedienungsanleitung
Seitenanzahl: 126
Dateigröße: 1.46 Mbytes (1534685 Bytes)
Sprache: Englisch
Revision: 3
Dokument-ID/Nummer: PN 869321
Datum: November 1997
Qualität: Elektronisches Dokument, kein Scan, sehr gut lesbar.
Upload Datum:
MD5: 96c7e0dc0a8e2b24df9d3509db4519bb
ed2kID: 75fc645959ba27de9ce7a6b23d18ccc3
Downloads: 111 seit 29 November 2014
Informationen:
1 Introduction and
Specifications..........................................................
1-1
1-1. Introduction
...........................................................................................
1-3
1-2. Hardware Options
..................................................................................
1-4
1-3. 734A-7001 Instrument Enclosure
..................................................... 1-4
1-4. 723B-7001 External Battery and Charger
......................................... 1-4
1-5. Accessory Y734 Rack Mount Kit
..................................................... 1-4
1-6. Calibration Options
...............................................................................
1-5
1-7. 732B-000 Special Calibration
........................................................... 1-5
1-8. 732B-100 Special Calibration and Drift Characterization
................ 1-5
1-9. 732B-200 On-Site Calibration
.......................................................... 1-5
1-10. Warranty Information
............................................................................
1-5
1-11. Service and Reshipment Information
.................................................... 1-6
1-12. Specifications
........................................................................................
1-6
2
Installation............................................................................................
2-1
2-1. Introduction
...........................................................................................
2-3
2-2. Unpacking and Inspection
.....................................................................
2-3
2-3. Selecting Line Voltage and Accessing the Fuse
................................... 2-4
2-4. Connecting to Line Power
.....................................................................
2-5
2-5. Installing a 732B or 732B-7001 in a 734A-7001
Instrument Enclosure 2-5
3
Operation..............................................................................................
3-1
3-1. Introduction
...........................................................................................
3-3
3-2. Summary of the Features
.......................................................................
3-3
3-3. 732B DC Standard Front Panel
......................................................... 3-3
3-4. 732B DC Standard Rear Panel
.......................................................... 3-3
3-5. 732B-7001 External Battery and Charger Front Panel
..................... 3-3
3-6. 732B-7001 External Battery and Charger Rear Panel
...................... 3-3
3-7. 734A-7001 Instrument Enclosure Front Panel
................................. 3-3
3-8. 734A-7001 Instrument Enclosure Rear Panel
.................................. 3-3
3-9. Powering the Standard
..........................................................................
3-11
3-10. Setting the BAT Switch
....................................................................
3-12
3-11. Charging the Internal Battery
........................................................... 3-12
3-12. Powering the Standard from a 732B-7001
........................................ 3-12
3-13. Replacing the Internal Battery
.......................................................... 3-13
3-14. Connecting Cables to the Output
.......................................................... 3-14
3-15. Connecting the GUARD and GROUND
.......................................... 3-15
3-16. Monitoring Oven Temperature
..............................................................
3-16
3-17. Resetting the IN CAL Indicator
............................................................
3-16
3-18. Monitoring The IN CAL Indicator State Remotely
.............................. 3-16
3-19. Monitoring Long-Term Stability
........................................................... 3-17
3-20. Minimizing Error Sources
.....................................................................
3-18
3-21. Mechanically Induced Errors
............................................................
3-18
3-22. Thermal EMFs
..................................................................................
3-18
3-23. Output Cable Loading
.......................................................................
3-18
4 Theory of
Operation.............................................................................
4-1
4-1. Introduction
...........................................................................................
4-3
4-2. Overall Functional Description
............................................................. 4-3
4-3. Model 734A Functional Description
................................................ 4-5
4-4. Model 732B-7001 External Battery/Power Supply
.......................... 4-5
4-5. 732B Circuit Description
......................................................................
4-5
4-6. 10V Reference Circuit
......................................................................
4-5
4-7. Generating the 1.018V Output
...................................................... 4-7
4-8. Biasing the Refamp for Low Temperature Coefficient
................ 4-7
4-9. Sense Current Cancellation
.......................................................... 4-7
4-10. Buffering of the 10V Output
........................................................ 4-8
4-11. Oven Temperature Controller A4
..................................................... 4-8
4-12. A1 Front Panel Assembly
.................................................................
4-8
4-13. Power Supplies and Battery Charger Assembly A5
......................... 4-9
4-14. Overvoltage Protection Circuitry
................................................. 4-9
4-15. Raw DC Power Supply
.................................................................
4-11
4-16. Battery Charger
.............................................................................
4-11
4-17. +11.5V Preregulator
.....................................................................
4-11
4-18. +11.5V Low-Dropout Regulator
.................................................. 4-12
4-19. -6V Power Supply
.........................................................................
4-12
4-20. IN CAL Logic
...............................................................................
4-12
4-21. LED Drive Logic
..........................................................................
4-12
4-22. AC Power to Battery Power Switching Circuitry
......................... 4-13
4-23. Battery Circuit
..............................................................................
4-13
4-24. Rear Panel Connections
................................................................
4-13
4-25. Low-Battery Shutdown Circuitry
................................................. 4-14
5 Maintenance
.........................................................................................
5-1
5-1. Introduction
...........................................................................................
5-3
5-2. Service Information
...............................................................................
5-3
5-3. Replacing the Fuse
................................................................................
5-3
5-4. Cleaning the External Surfaces
............................................................. 5-3
5-5. Calibration
.............................................................................................
5-3
5-6. Preparing for Calibration
..................................................................
5-4
5-7. Preparing for 10V Calibration with Adjustment
............................... 5-4
5-8. Calibration with Adjustment
............................................................. 5-6
5-9. Calibration Without Adjustment
....................................................... 5-8
5-10. Access Procedures
.................................................................................
5-9
5-11. Initial Access Procedure
...................................................................
5-9
5-12. Replacing the Battery
........................................................................
5-9
5-13. Replacing the Oven Assembly
.......................................................... 5-13
5-14. Accessing the A5 Battery Charger
.................................................... 5-13
5-15. Removing the Power Transformer Assembly
................................... 5-13
5-16. Troubleshooting
....................................................................................
5-14
5-17. 10V Reference Performance Test
..................................................... 5-14
5-18. Troubleshooting the A5 Battery Charger Assembly
......................... 5-14
5-19. Transformer/Rectifier/Filter
......................................................... 5-15
5-20. Battery Charger
.............................................................................
5-15
5-21. +11.5V DC Preregulator
...............................................................
5-15
5-22. +11.5V DC Regulator
...................................................................
5-16
5-23. -6V DC Supply
.............................................................................
5-16
5-24. IN CAL LED Logic
......................................................................
5-16
6 List of Replaceable Parts
....................................................................
6-1
6-1. Introduction
...........................................................................................
6-3
6-2. How to Obtain Parts
..............................................................................
6-3
6-3. Manual Status Information
....................................................................
6-3
6-4. Newer Instruments
................................................................................
6-3
6-5. Service Centers
.....................................................................................
6-4
6-6. Parts
.......................................................................................................
6-4
7 Schematic
Diagrams............................................................................
7-1
A1 Front Panel
PCA............................................................................................
7-3
A2 Flex Circuit PCA
...........................................................................................
7-5
A3 BCD Switch PCA
..........................................................................................
7-6
A4 Oven Control
PCA.........................................................................................
7-7
A5 Power Supply
PCA........................................................................................
7-8
Index
Fluke-6495-Manual-Page-1-Picture
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