Fluke 8505A User manual

Instruction Manual
P/N 638841
MARCH 1983 REV 1,3/86
®1986, John Fluke Mfg. Co., Inc. All Rights Reserved. Litho in U.S.A.

1-1. INTRODUCTION
1-2. This eight-section manual provides comprehensive
information for installing, operating and maintaining
your Fluke digital multimeter. Complete descriptions and
instructions are included for the instrument mainframe,
for all modules necessary in making dc volts
measurements, and for any optional modules ordered
with the instrument. Appropriate sectionalized
information is also included with any optional modules
subsequently ordered and may be inserted in Section 6.
1-3. DESCRIPTION
1-4. The multimeter features 6-1/2 digit resolution, full
annunciation and simplicity of operation. Modular
construction, microprocessor control, and abus structure
provide excellent flexibility. Memory programming from
the front panel (or through aremote interface) controls all
measurement parameters, mathematic operations and
special operations. An averaging mode is available to
automatically optimize display resolution and stability
for each function and range. The standard hardware
configuration allows for measurement of dc volts in five
ranges with 100 nV resolution on the lowest range.
Optional modules are available for ac volts (four ranges),
ac or dc current (five ranges), and resistance (eight ranges)
in two-wire or four-wire arrangements.
1-5. Modular Construction
1-6. Considerable versatility is realized through unique
contruction. All active components are contained in
modules which plug into amainframe motherboard. This
module-motherboard mating, combined with bus
architecture and microprocessor control, yields both ease
of option selection and reduced downtime.
NOTE
The A3 Isolator PCS is standard in the
8505A. This assembly is documented in
Section 6ofthis manual as Option -08A.
1-7. Microprocessor Control
1-8. All modules function under direct control of a
microprocessor based controller. Each module is
addressed by the controller as virtual memory. External
reference values and offsets can be applied separately,
stored in memory, and automatically used as factors in all
subsequent readings. Digital filtering utilizes averaged
samples for each reading.
1-9. Software Calibration
1-10. The 8505A features microprocessor-controlled
calibration of all ranges and functions. Any range can be
calibrated using areference input of any known value
from 60% of range to full scale. Software calibration can
be performed using front-panel or remote control,
allowing recertification without opening the case or
removing the multimeter from the system.
1-11. R@elreufating Remainder A/D Conversion
1-12. The multimeter adapts Fluke’s patented
recirculating remainder (R2)A/D conversion technique
to microprocessor control. This combination provides
fast, accurate, linear measurements and long-term
stability.
1-13. Options and Accessories
1-14. Remote interfaces, ac converters, acurrent
converter, and an ohms converter are among the
numerous options and accessories available for use with
the multimeter. Refer to Tables 1-1 and 1-2 for complete
listings. AC conversion can be accomplished with either
the AC Averaging module (Option 01) or the RMS
module (Option 09A). Any one of the three Remote
Interface modules (Option 05, 06, or 07) can be installed
at one time.
1-15. SPECIFICATIONS
1-16. Mainframe specifications with dc volts and dc
ratio measurement capability are presented in Table 1-3.
Optional function specifications are supplied with the
respective option modules and included in Section 6.

8505A
Table 1-1. Options
OPTION
NO. NAME NOTES
01 AC/DC Converter (Averaging) 1, 3
02A Ohms Converter
03 Current Shunts 3
05 IEEE Standard 488-1975 Interface 2
06 Bit Serial Asynchronous Interface 2
07 Parallel Interface 2
09A AC/DC Converter (True RMS) 1, 3
1) Options 01 and 09A cannot be
installed simultaneously.
2) Only one of Options 05. 06. and 07
can be installed at any time.
3) For the ac portion of Option 03 to
operate, either Option 01 or 09A .....
must be installed.
Table 1-2. Accessories
MODEL OR
PART NO. NAME
M04-205-600 574-inch Rack Adapter
M00-260-610 18-inch Rack Slides
M00-280-61
0
24-inch Rack Slides
80K-6 High Voltage Probe
80K-40 High Voltage Probe
83RF High Frequency Probe
85RF High Frequency Probe
Y8001 IEEE Std. Cable, 1Meter Length
Y8002 IEEE Std. Cable, 2Meter Length
Y8003 IEEE Std. Cable, 4Meter Length
MIS-701 IK* Extender Card
MIS-71 90K’ Static Controller
MIS-7191K* Test Module
MIS-7013K* Bus Interconnect and Monitor
Tor use during service or repair.
j
Table 1-3. Specifications
GENERAL SPECIFICATIONS
Dimensions 10.8 cm High x43.2 cm Wide x42.5 cm Long
(4.25 in High x17 in Wide x16.75 in Long) (See Figure 1-1)
Weight
BASIC ... .10 kg (22 lbs)
FULLY LOADED .... 12 kg (26 lbs)
Operating Power
VOLTAGE .... 100V ac, 120V ac, 220V ac, or 240V ac (±10%)
BASIC INSTRUMENT POWER . .
.
—12 watts
FULLY LOADED POWER 24 watts
FREQUENCY —47 Hz to 63 Hz (400 Hz available on request)
Warm-Up —2hours to rate accuracy
Shock and Vibration —Meets requirements of MIL-T-28800 for type III, class 5,
style Eequipment.
Temperature Range
OPERATING .... 0°C to 50°
C
NON-OPERATING .... -40° Cto 70°
C
Humidity Range
0°C TO 18°C ....80% RH
18°C TO 40° C. . . . 75% RH
40° CTO 50° C... . 45% RH
Maximum Terminal Voltage
LO TO GUARD 127V rms
GUARD TO CHASSIS 500V rms
HI SENSE TO HI SOURCE .... 127V rms
LO SENSE TO LO SOURCE .... 127V rms
HI SENSE TO LO SENSE .... 1000V rms or 1200V dc
HI SOURCE TO LO SOURCE .... 280V rms
1-2

8505A
DC VOLTAGE
Input Characteristics
FULL SCALE RESOLUTION INPUT
RESISTANCE
RANGE 6’/
2DIGITS rvh 1
DIGITS*
6’/2
DIGITS
100 mV 200.0000 mV —100 nV >10,000MQ
IV 2.000000V —1//V >10,000MQ
10V 20.00000V 1/iV 10 >10,000MQ
100V 128.0000V —100 //V 10MQ
1000V 1200.000V —1mV 10MQ
’7'/
2-digit resolution: In AVG operating mode.
Accuracy
DC VOLTS: ±(% of Reading +Number of Counts)
24-HOUR 90-DAY
RANGE 23°C ±1°C’ 23° C±5°C
OPERATING MODE OPERATING MODE
NORM AVG NORM AVG3
100 mV 0.0018 +15 0.0010 +80.0025 +40 0.0020 +8
IV 0.0008 +70.0005 +40.0015 +80.0012 +6
10V 0.0006 or 6* 0.0005 or 502*0.0010 +80.0008 +602
100V0.0010 +60.0005 +50.0018 +80.0015 +6
1000V 0.0008 +6 0.0005 +50.0018 +80.0015 +6
'Whichever is greater
>90-Day: 23° C±5°C
Add to the 90-day specification per month the following %of Reading and Number of Counts.
RANGE OPERATING MODE
NORM AVG3
100 mV
IV
10V
100V
1000V
0.00017 +5.6
0.0001 +0.1
0.0001 +0.1
0.00013 +0.1
0.00013 +0.1
0.0001 +0.1
0.0001 +0.1
0.00008 +I2
0.0001 +0.1
0.0001 +0.1
NOTES:
’Relative to calibration standards, 4-hour warm-up, within 1hour of dc zero. After software calibration
add the following to the 24 hour accuracy specification:
TIME SINCE INTERNAL
(HARDWARE) CALIBRATION NUMBER OF COUNTS'
<30 Days 0
<90 Days 1
<1 Year 2
>1 Year 3
'With 6VS?-digit display. For 714-digits, multiply Number of Counts by 10.
27Vi>-digit mode of operation.
3After 4-hour warm-up, within 1hour of dc zero.
1-3

8505A
Table 1-3. Specifications (cont)
Operating Characteristics
TEMPERATURE COEFFICIENT: ±(% of Reading +Number of Counts)/°C
RANGE 0°C TO 18°C AND 28°C TO 50°C
100 mV 0.0003 +5
IV 0.0003 +1
10V 0.0002 +0.5*
100V 0.0003 +1
1000V 0.0003 +0.5
’Multiply Number of Counts by 10 for AVG operating mode (7Vfe-digit).
INPUT BIAS CURRENT
AT TIME OF ADJUSTMENT 1-YEAR 23° C±1°C TEMPERATURE COEFFICIENT
<±5 pA <±30 pA <±1 pA/°C
ZERO STABILITY Less than 5/iV for 90 days after afour-hour warm-up. Front panel
pushbutton zero is provided for permanent storage of azero
correction for each range. Zero may be turned off at any time.
MAXIMUM INPUT VOLTAGE +1200V dc or 1000V rms ac to 60 Hz, or 1400V peak above 60 Hz may
be applied continuously to any dc range without permanent damage.
Maximum common mode rate of voltage rise is 1000V //vsec.
ANALOG SETTLING TIME
FILTER MODE FILTER
COMMAND TO 0.01% OF
STEP CHANGE TO 0.001% OF STEP CHANGE
Bypassed FI 2ms 20 ms
Fast F0 or F3 40 ms 50 ms
Slow For F2 400 ms 500 ms
DIGITIZING TIME
Line Synchronous For 2° to 217 samples per reading digitizing time is from 4ms to 9
minutes 6seconds using a60 Hz ac line with times increasing 20%
using a50 Hz ac line. Selectable in 18 binary steps.
Line Asynchronous 2ms. {In 3byte binary mode with dc zero, offset, limits and calibration
factors turned off.)
NOISE REJECTION
Normal Mode Rejection
LINE
FREQUENCY FILTER
MODE 4SAMPLES/ READING 32 SAMPLES/ READING 128 SAMPLES/
READING
50 hertz Fast 60 dB 70 dB 75 dB
50 hertz Slow 85 dB 90 dB 95 dB
60 hertz Fast 60 dB 70 dB 75 dB
60 hertz Slow 90 dB 95 dB 100 dB
Common Mode Rejection 160 dB at 60 hertz with 1kO in series with either lead, and 4samples or
more per reading. Greater than or equal to 100 dB with less than 4
samples per reading.
1-4

8505A
Table 1-3. Specifications (cont)
DC RATIO
Accuracy
EXTERNAL REFERENCE VOLTAGE’ ACCURACY’
±20V to ±4QV ±(A +B+0.001%)
±Vmin to ±20V ±(A +B+(0.02% /|Vxref D)
'Maximum External Reference Voltage =±40V between External Reference HI and LO terminals,
providing neither terminal is greater than ±20V relative to the Sense LO or Ohms Guard2terminals.
Operating Characteristics
INPUT IMPEDANCE External Reference HI or LO >10,000 MQ relative to Ohms Guard2or
Sense LO.
BIAS CURRENT External Reference HI or LO relative to Ohms Guard2or Sense LO <5
nA.
SOURCE IMPEDANCE Resistive Unbalance (External Reference HI to LO) <4 kfl Total
Resistance to Sense LO from either External Reference HI or LO <20
kQ.
MAXIMUM OVERLOAD VOLTAGE ... ±180V dc or peak ac (relative to Ohms Guard2orSense LO). ±360V dc
or peak ac (External Reference HI to LO).
NOISE REJECTION
INPUT
TERMINALS NORMAL MODE COMMON MODE
Sense Same as dc volts Same as dc volts
External line frequency and line frequency and
Reference 2x line frequency 2x line frequency
>100 dB >75 dB
RESPONSE TIME
Analog Settling Time
FILTER MODE FILTER
COMMAND TO 0.01% OF STEP CHANGE TO 0.001% OF
STEP CHANGE
Bypassed FI 2ms 20 ms
Fast F0 or F3 40 ms 50 ms
Slow F or F2 400 ms 500 ms
NOTES: (DC Ratio)
'A -10V dc range accuracy for the appropriate period of time.
BInput signal function and range accuracy for the appropriate period of time.
Vdiin Minimum allowable External Reference Voltage =±0. 0001V, or V.nput /109(whichever is greater).
lV/r..f| Absolute value of the External Reference Voltage
Ohms Guard is available through the rear input.
1-5

8505A
Table 1-3. Specifications (cont)
DC RATIO (cont)
Operating Characteristics (cont)
Digitizing Time For 2° to 2’ 7samples per reading digitizing time is from 196 ms to9
minutes 6seconds using a60 Hz ac line with times increasing 20%
using a50 Hz ac line. Selectable in 18 binary steps.
MAXIMUM RATIO DISPLAY +1.00000 E±9
EXTERNAL TRIGGER INPUT
Polarity
High Level
Low Level
Pulse Width
Connector
Maximum Input
Maximum Shell to Ground
May be wired internally for either rising or falling edge. Factory wired
for falling edge.
+4.3V (minimum)
+0.7V (maximum)
10 fjs (minimum)
BNC with the outer shell at interface common
±30V
±30V
SCAN ADVANCE OUTPUT
Polarity
High Level
Low Level
Pulse Width
Connector
Maximum Shell to Ground
Positive
>+4V (TTL High)
<+0.7V (TTL Low)
3/js (minimum)
BNC with the outer shell at interface common
±30V
13.25 cm r*
(5.219 in) 5.72 cm
3.77 cm
(1.484 in) FRONT VIEW
(4.25 in)
1.27 cm
(.5 in)
41.66 cm (16.4 in)
-46.23 cm (18.2 in)
RIGHT SIDE VIEW
Figure 1-1. Dimension Drawing
1-6

2-1. INTRODUCTION
2-2. installation and operation of the multimeter are
explained in this section. These instructions should be
read thoroughly prior to multimeter operation. Once a
familiarization with the instrument is achieved, parts of
this section will serve as aquick reference. Explanations
and applications are provided for all standard functions
and operations. Should any difficulties arise, contact
your nearest Fluke Sales Representative (listed in Section
7) or the John Fluke Mfg. Co., Inc.; P.O. Box C9090;
Everett, WA. 98206; tel. [phone]).
2-3. SHIPPING INFORMATION
2-4. The multimeter is packaged and shipped in afoam-
packed container. Upon receipt of the instrument, a
thorough inspection should be made to reveal any
possible shipping damage. Special instructions for
inspection and claims are included with the shipping
container.
2-5. If reshipment is necessary, the original container
should be used. 1fthe original container is not available, a
new container can be obtained from John Fluke Mfg.
Co., Inc. Please reference the instrument model number
when requesting anew shipping container.
2-6. INSTALLATION
2-7. Non-marring feet and atilt-down bail arrangement
are installed on the instrument for field or bench use. A
rack-mounting kit and rack slides are available for use
with the standard 19-inch equipment racks. Information
regarding installation and rack-mounting accessories is
contained in Section 6.
2-8. The multimeter operates from 100, 120, 220, or
240V ac (±10%) at 50 or 60 Hz. Line voltage selection
must be verified before the power cord is connected. This
verification procedure is explained in Section 4.
WARNING
TO AVOID ELECTRICAL SHOCK, PRO-
PERLY GROUND THE CHASSIS. AGROUND
CONNECTION IS PROVIDED ON THE
THREE-PRONG POWER CONNECTOR. IF
PROPER GROUND IN YOUR POWER
SYSTEM IS IN DOUBT, MAKE ASEPARATE
GROUND CONNECTION TO THE REAR
PANEL CHASSIS BINDING POST.
OTHERWISE, THE POSSIBILITY OF
ELECTRICAL SHOCK MAY EXIST IF HIGH
VOLTAGE IS MEASURED WITH THE LEADS
REVERSED (INPUT HI GROUNDED).
2-9. OPERATING FEATURES
2-10. Front and rear panel features are illustrated in
Figure 2-1 and described in Table 2-1. Use this
information for initial familiarization with the
multimeter. Afull explanation of all features is presented
later in this section.
2-11. OPERATING NOTES
2-12. Input Power
2-13. Abinding post on the rear panel has been
provided as an earth ground connection. Line voltage
selection (100, 120, 220, or 240V ac) is explained in
Section 4. With the exception of proportionately slower
reading rates and filter time-outs, operation at 50 Hz is
identical to that at 60 Hz.
2-14. The line fuse (0.5A MDL Slow Blow for 100 or
120V ac, or 0.25 MDL Slow Blow for 220 or 240V ac) is
located on the lower right side of the rear panel (in the
heat sink). The current and ohms protection fuse (1.5
A
AGC) is located in the lower right-hand corner of the
front panel for front input connections and on the left side
of the rear panel (as seen from the rear) for rear input
connections. Refer to Fuse Replacement in Section 4
before replacing any fuse.
2-1

85i
ITEM NAME
Displays 5Vs, QVz or 7Vz digits with polarity and decimal point. Also
displays errors and warnings, prompts, numerics, recalled values, and
limits indications.
Mantissa Field
Exponent Field Polarity and value of exponent shown for engineering notation of
display value. In Averaging or Calibration mode, the exponent may
be used as an extra digit of resolution.
Function Annunciators Annunciator lights to indicate function selection. VDC and VAC
annunciators will both light when respective functions are simul-
taneously selected and the RMS Converter is installed.
TRIGGER Push Buttons TRIGGER push buttons used to select continuous (AUTO) or indiv-
idual (MANUAL/EXTERNAL) measurement triggers.
IT '
IIl: ;
-Vj—
2-2