Fluke 731B User manual

731
B
Table of Contents
SECTION TITLE PAGE
1INTRODUCTION AND SPECIFICATTONS M
M. INTRODUCTION 1-1
1-
7. SPECIFICATIONS 1-2
2OPERATING INSTRUCTIONS 2-1
2-
LINTRODUCTION 2-1
2-3. SHIPPING INFORMATION 2-1
2-6. INPUT POWER 2-1
2-9. RACK INSTALLATION 2-2
2-11. OPERATING FEATURES 2-2
2-13. OPERATING NOTES 2-2
2-15. Guarded Operation 2-2
2-18. Battery Operation 2-4
2-20. OPERATION 24
2-21. Turn-On Procedure 2-4
2-23. Standard Cell Transfer 24
2-
25. Reference Voltage Modes 2-5
3THEORY OF OPERATION 3-1
3-
1. INTRODUCTION 3-1
3-3. OVERALL FUNCTIONAL DESCRIPTION 3-1
3-5. BLOCK DIAGRAM ANALYSIS 3-1
3-6. General 3-1
3-8. Charging Circuit 3-2
3-11. Reference Supply 3-2
3-14. Output Divider 3-2
{Continued on page ii
}

731
B
TABLE OF CONTENTS (Continued)
SECTION TITLE PAGE
4MAINTENANCE 4.I
4-1. INTRODUCTION 4.I
4-3. SERVICE INFORMATION ^i4.I
4-6. GENEIU\L MAINTENANCE 4*2
4-7, Access Information 4_2
4-9. Cleaning 4.2
4-11. Fuse Replacement 4.2
4-13. Service Tools 4.2
4-15. PERFORMANCE TEST !!.^!4-2
4-17. Line Regulation 4.2
4-18. Output Noise, DC to IHz 4.2
4-19. Output Noise, 1Hz to 1MHz 4^
4-20. Common Mode Rejection 44,
4-21. Isolation 4.5
4-22. Transfer Accuracy 4.5
4-23. CAUBRATION 4-6
4-
25. TROUBLESHOOTING !!!!!.'!!! 4-7
5LIST OF REPLACEABLE PARTS 5.I
TABLE OF CONTENTS 5.I
5-
1. INTRODUCTION !!!!
!5*2
5.4. HOW TO OBTAIN PARTS !!! !
!5^2
5-
7. USE CODE EFFECTIVITY UST !!!^!5-2
6OPTIONS AND ACCESSORIES
6-
i. INTRODUCTION ^j
6-3. RACK MOUNTING KITS !!!!!!!!! 6*1
7GENERAL INFORMATION 7.I
8SCHEMATIC DIAGRA.MS g.j
ii

731
B
List of Illustrations
'III"'*,I—
FIGURE TITLE PAGE
1-
1Outline Drawing j-3
2-
1731 BControls, Indicators, and Connectors 2-2
2-2 Guard Connections 2-4
2-
3Standardizing the 73 IB 2-5
3-
173 IB Simplified Block Diagram 3-1
3-
2Reference Amplifier 3-2
4-
1Adjustment Locations 4-3
4-2 Equipment Connections for Line Regulation, DC to 1Hz Output
Noise, and Transfer Accuracy Tests 4A
4-3 Equipment Connections for 1Hz to 1MHz Output Noise Test ..,.4-4
4-4 Equipment Connections for Common Mode Rejection Test 4-5
4-5 Equipment Connections for Divider Adjustment 4-6
4-
6Equipment Connections for Absolute Voltage Adjustments 4-7
5-
173 IB Final Assembly 5-4
5-2 Reference Regulator PCB Assembly 5-7
5-
3Power Supply and Adjustment PCB Assembly 5-10
6-
1Rack Mounting Configurations 6-1
6-2 Rack Ear Installation 6-2
6-3 Dual, Triple, and Quad Mounting 6-3
B-1 73 IB DC Reference Standard (73 IB-1011) 8-3
iii

TABLE TITLE PAGE
2-1 73 IB Controls, Indicators and Connectors 2-3
4-1 Required Test Equipment 4-1
4-2 73 IB Calibration 4-6
7-1. List of Abbreviations &Symbols 7-1
7-2. Federal Supply Codes for Manufacturers 7-3
7-3. Fluke Technical Centers y.jO
7-4. Sales Representatives 7-1
1
7-5. Sales Representatives -International 7-13
IV

731
B
Section 1
Introduction &Speci ications
1-1. INTRODUCTION
1-2. The Model 731 BDC Reference Standard is an ultra-
stable dc power supply which, when standardized, is cap-
able of providing avariety of precision output voltages
with standard cell accuracy. The 73 IB will furnish basic
dc voltage outputs of lOV, IV, AE (000 to 999 pV),
1.018 +AE, and 1.019 +AE.
1-3. The desired voltage mode is selected using afront
panel function switch and the value of AE is adjustable us-
ing a10-turn linear potentiometer. The front panel AE con-
trol includes a3digit turn counter to indicate the selected
value of AE, i.e., 000 to 999 pV. The counter is equipped
with alocking lever to prevent accidental changing of ase-
lected AE setting,
1-4. Afront panel guard connection is provided for use
in reducing errors causedby common mode voltages. The
guarded internal circuitry is isolated from the chassis and
earth ground.
1-5. Power to operate the 73 IB can be derived from
either an internal battery pack for field or portable use, or
from the ac power line for bench use. Afront panel meter
indicates the relative charge level of the internal battery
pack during portable use. The AC line requirements are
1I5/230V ac,50to 400 Hz.
1-6. The 73 IB is supplied with non-marring feet for
bench or field use. It may also be conveniently mounted in
astandard 19” equipment rack using one of the rack mount-
ing accessory kits shown in Table 1-1.
Table M. ACCESSORY RACK MOUNTING KITS
MODEL NUMBER MOUNTING
CONFIGURATION
M03-201-601
M03-202-603
M03-206-604
M03-205-605
One 731 B, Offset mounting
Two731B's, Side-by-side
Three 731 B's, Side-by-side
Four 731 B's, Side-by-side
1-1

731B
1-7. SPECIFICATIONS
Output Voltage
Range
10.0
1.0
1.018 +AE
1.019 +AE
AE
Output
10.0V dc
1.OV dc
1.018 to 1.018999V dc
1.019 to 1.019999V dc
0to 999 liV dc with
1juV resolution
Output Accuracy: Absolute accuracy at 23°C +1°C
after 30 minute warm-up
Range Period
10V
IV
1.01 8+ -Ae
Ae
30 days 90 Days 1Year
+10 PPM
+10 PPM
+10 PPM
+15 PPM
+15 PPM
+15 PPM
+30 PPM
+30 PPM
+30 PPM
+2uV
Transfer Accuracy: 4Hr
Between standard cells on 1.018V +2ppm
AE or 1.019V +AE ranges:
Between standard cell and IV 3ppm
output:
Between 10V output and standard 5ppm
ceil or IV output:
Temperature Coefficient:
Less than 1PP^/i/C^ 10°Cto45°C
Less than 2PPM/c“, 0'’C to lO^C and 45°C to 55°C
Output Current:
IV, 1.018V, 1.019V Ranges:
The Reference Transfer Standard is designed to per-
form as astandard cel! and therefore is intended to
operate into ahigh impedance on the IV, 1.018V and
1.019V ranges drawing minute currents. This impe-
dance is usually infinity as in potentiometric circuits,
or, in other applications should be at least 100 Meg-
ohms to prevent source loading.
Source Resistance:
10V Range <0.0717
IV, 1.018V. 1.019V,
AE Ranges: <1kS7
Output Protection:
The output may be shorted indefinitely without
damage to instrument.
Line Regulation:
Less than 1PPM for +10% line variation.
Ripple &Noise:
Less than 1PPM P-P dc to 1Hz
Less than 20 juV RMS 1Hz to 1MHz
Except <70 juV RMS @10V output
Common Mode Rejection:
120 db at DC
100 dbateO Hz
85 db at 400 Hz
Isolation:
Output may be floated up to 500 VDC between
chassis ground and guard.
Calibration Adjustment:
10 Volt Range:
The 10 volt range is used in applications where some
degree of loading is placed on the Reference Transfer
Standard such as aKelvin Varley Divider or other re-
sistance networks.
Loading Effect on the 10V Range
;
Load R. Output Change (PPM)
100 M12 0
10 M17 0.005 «=0
1M17 .05
0.1 M17 .5
10 KQ 5
Separate internal adjustments for the 5output vol-
tages. Front panel adjustment common to ail voltages
including the 10.000V output. Basic reference adjust-
ments accessible from the front panel.
Temperature/Humidity:
+0°C to +55°C operating.
—40'^C to +60°C non-operating.
Up to 70% RH for temperatures <35°C
Shock &Vibration:
Meets requirements of MIL-T-21200L
1-2

731
B
Terminals:
Four five-way binding posts for positive, negative,
ground and guard. Positive and negative are solid
copper with gold flash.
Battery Operation:
Rechargeable nickel-cadmium batteries provide at least
30 hours of continuous operation.
input Power:
115V or 230V +10V ac, 50 to 400 Hz single phase or
interna! battery operation.
6watts maximum, 120 Ma maximum
Size:
SVa" high X4%" wide x12" deep. (8.8 x10.7 x30.4
(8.8 X10.7 X30.4 cm)
Weight:
5lbs (2.26 kg)
Figure 1-1. 7318 OUTLINE DRAWING

731 B
2-1. INTRODUCTION
2-2. This section of the manual contains infonnation re-
garding instaliation and operation of the Model 731 BDC
Reference Standard. It is recommended that the contents of
this section be read and understood before any attempt is
made to operate the 73 IB. Should any difficulties arise
during operation, please contact your nearest John Fluke
ISales Representative or the John Ruke Mfg. Co., Inc.,
P.O. Box 43210, Mountlake Terrace, WA 98043; telephone
(206) 774-221 1. Alist of Sales Representatives is located
in Section 7of this manual.
2-3. SHIPPING INFORMATION
2-4, The 73 1Bis packaged and shipped in afoam -
packed container. Upon receipt of the instrument, athor-
ough inspection should be made to reveal any possible
shipping damage. Special instructions for inspection and
claims are included in the shipping carton.
2-5. If reshipment of the equipment is necessary, the
original container should be used. If the original container
is not available, anew container can be obtained from tlie
John Fluke Mfg. Co., Inc. Please reference the equipment
model number when requesting anew shipping container.
2-6. INPUT POWER
2-7 .The 73 1Bcan be operated from a115 or 230V ac,
50 to 400 Hz power line. Before connecting the instrument
to the power line, check and, if necessary, set the instrument
to operate at the local line voltage as follows:
2-1

731B
a. RemoVethe to pCOve rfroiri the73iBa n d1oc ate
the input power selection switch on the inside of
the 73 IB.
b. Set the slide switch to the desired operating vol-
tage, 115(white dot) or 230 (red dot).
c. Install the proper fuse (i.e., AGC ViK for 115V ac
and AGC %A for 230V ac) in the rear panel fuse
holder.
2-8. The rear panel input power connector is athree
prong, U-ground connector which permits the in-
strument to be connected, via the power cord, to
the appropriate line power. The offset prong on
this connector is connected to the 73 IB chassis
and power supply, and should be connected, via
the power cord, to ahigh quality earth ground.
2-9. RACK INSTALLATION
2-10, The 73 1Bis designed for bench-top use or for in-
stallation in astandard 19-inch equipment rack, using one
of the optional accessory rack mounting kits. Information
regarding rack installation procedures is given in Section 6
of this manual.
2-11. OPERATING FEATURES
2-12. The 731 Bcontrols, indicators and connectors
are shown in Figure 2-1, and described in Table 2-1.
2-13. OPERATING NOTES
2-14, The following paragraphs describe various condi-
tions which .should be considered before operating the 73 IB.
2-15. Guarded Operation
2-1 6, The 73 IB is equipped with aguard that isolates its
internal circuitry from the chassis and earth ground. A
GUARD terminal is provided on the Torntpanel, and when
used, greatly reduces errors caused by common mode vol-
tages. In general, guarded operation will be necessary under
the following conditions:
a. Wlren apotential exists between equipment power
line grounds.
b. Wlien long connecting leads are used to contact a
higli impedance load.
2-2
Figure 2-1. 731 BCONTROLS, INDICATORS AND CONNECTORS