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Gerät:
4911
Datum:
1990
Kategorie:
Gruppe:
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The 4910 and 4911 are Electronic DC Voltage
Reference Standards which feature four separate
and highly stable 10V outputs. While their
performance is comparable to that of saturated Weston standard cells, they eliminate most of the
drawbacks encountered in standard cell use and
maintenance. In addition to replacing saturated Weston cells as a laboratory standard, the 4910 and 4911 can also be used as a readily
transportable standard.
The 4910 and 4911 DC Voltage Standards are
based on the latest zener-diode technology. Their
four separate 10V outputs are fully independent,
but can if required be averaged to provide a very
low noise 10V output on separate front-panel
terminals. The provision of both individual and
average outputs enables direct inter-comparison
between the cells at the output terminals, allowing
excessive drift in any cell to be detected without
the use of higher accuracy standards. The
individual outputs-are adjustable to within
microvolts of one another, so that inter
comparison is possible to a very high level of
accuracy.
In addition to itsfour individual cell outputs and its
average 10V output, the4910also features IV and
1.018V outputs, and a low-impedance 10V output
with 4-wire sensing.
In their normal operating mode, the units can be
powered from an ac line supply or from their
internal batteries. Both models also feature a
special low-power transit mode, which can be used
during transportation or shipment of a unit to
maintain its calibration. In transit mode, power
can be derived from the unit’s internal batteries,
from an external DC supply, or from an AC line
supply.
1 Handbuch
Bedienungsanleitung
Dokumenttyp:
Bedienungsanleitung
Seitenanzahl:
80
Größe:
5,7 MB
Sprache:
englisch
Revision:
Issue 1
Dokument-ID:
850254
Datum:
Januar 1990
Qualität:
Gescanntes Dokument, teilweise schwer oder teilweise nicht zu lesen.
Upload Datum:
29. Dezember 2016
MD5:
80b0a6aa-7065-b23d-3b69-78b1c9be1cff
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1247
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USER'S HANDBOOK
SECTION 1 INTRODUCTION AND GENERAL DESCRIPTION
Introduction
General Description Accessories Principles of Operation
Operating Modes
SECTION 2 INSTALLATION
Unpacking and Inspection
Preparation for Operation
Preparation for Operation - Coid Shipment
Line Voltage Selection and Fuse Rating
Internal Battery Connection
AC Line Supply Connection
DC Power Connection
Calibration
Preparation for Operation - Hot Shipment
Immediate Checks
Line Voltage Selection and Fuse Rating
AC Line Supply Connection
DC Power Connection
Specification Verification
Mounting
SECTION 3 USING THE 4910 4911 4910 Front Panel Features 4911 Front Panel Features 4910 4911 Rear Panel Features
Setting Up the 4910 4911 Operating Modes
Normal Operating Mode
10V Cell Outputs
Average Output
Average Switching
4-Wire Output Buffer 4910 only)
Divided Outputs 4910 only)
Battery LEDs and Battery Supply LED
SECTION 3 (Contd.)
Normal Operating Mode (Contd.)
Temp LEDs
Line Supply LED
Guard T eiminal
Case Terminal
Battery/Charge Voltages
Normal/Transit Mode Switching
Transit Operating Mode
Battery LEDs
Temp LEDs
Transit/Normal Mode Switching
SECTION 4 SPECIFICATIONS
General Specifications
Output Specifications
SECTION 5
Introduction
SPECIRCATION VERIFICATION AND CALIBRATION
Calibration Confidence-check
Equipment Requirements
Interconnecting Leads
Null Detector Zeroing
Calibration Confidence-check Procedure
Calibration
Introduction
Equipment Requirements
Adjustment of Unit Under Test Outputs
Interconnecting Leads
Null Detector Zeroing
Calibration Procedure
Appendices:
A 4910 4911 Calibration Confidence-check Report Sheet
В 4910 4911 Calibration Report Sheet
С
Battery Charging Voltage Limits
D 4910 Measurement of Divided Outputs