Equipment information:

Fluke 57LFC Calibrator
Manufacturer:
Fluke
Model: 57LFC
Date: 2004
Category: Measurement instruments
Group: Calibrator
Description: System Calibrator
Information:
                                    The Fluke Model 57LFC System Calibrator (hereafter called
the Calibrator) is a precise
instrument that calibrates a wide variety of electrical
measuring instruments. This
calibrator maintains a high accuracy over a wide ambient
temperature range, and is able
to test instruments in harsh environments, eliminating the
restriction of calibrating only in
a temperature-controlled standards laboratory. With a 57LFC,
you can calibrate precision
multimeters that measure ac or dc voltage, ac or dc current,
and resistance. The Calibrator
operates in a similar manner to the 57XXA series calibrators.
Specifications are provided at the end of this chapter. The
Calibrator is a fullyprogrammable
precision source of the following:
• DC voltage to 220 V.
• AC voltage to 220 V rms, with output available from 10 Hz
to 100 kHz.
• AC and DC current to 2.2 A, with AC output available from
10 Hz to 20 kHz.
• Resistance in values from 0 Ω to 19 MΩ in 1 and 1.9x.
Features of the calibrator include the following:
• Automatic meter error calculation obtained through using a
simple remote adjust.
• Programmable entry limits used for restricting the levels
that can be remotely keyed
into the calibrator, preventing access to levels that may be
harmful to equipment or
personnel.
• Real-time clock and calendar.
• Offset and scaling modes that simplify linearity testing
of multimeters.
• Standard IEEE-488 (GPIB) interface, complying with
ANSI/IEEE Standards 488.1-
1987 and 488.2-1987.
• Internal self-testing and diagnostics of analog and
digital functions.
• Status LEDs on front panel to indicate standby (yellow),
operate (green), high
voltage (red), and fault (red and yellow).

These manuals are available for the above equipment:

Fluke -- 57LFC -- Service Manual
File name: Fluke-6523-Manual-Page-1-Picture
Manual Type: Service Manual
Pages: 208
Size: 4.63 Mbytes (4853336 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date: March 2004
Quality: Electronic document, no scan, very well readable.
Upload date:
MD5: 171d891cbaf195552a2fef5e40509212
ed2kID: 0ae391dd040f44791d2b56c64af7bf5c
Downloads: 77 since 29 November 2014
Information:
1 Introduction and Specifications
........................................................ 1-1
Introduction........................................................................................................
1-3
Service Information
...........................................................................................
1-3
Accessories
........................................................................................................
1-4
Low Thermal EMF Test
Leads......................................................................
1-4
Rack Mount Kit
.............................................................................................
1-4
Shielded IEEE-488 Cables (Y8021, Y8022, and Y8023)
............................. 1-4
Contacting
Fluke................................................................................................
1-5
Specifications.....................................................................................................
1-6
General
Specifications...................................................................................
1-6
Accuracy Specifications
................................................................................
1-7
DC Voltage Accuracy
...............................................................................
1-7
DC Current
Accuracy................................................................................
1-7
Resistance Accuracy
.................................................................................
1-7
AC Voltage Accuracy
...............................................................................
1-8
AC Voltage Distortion
..............................................................................
1-9
AC Current
Accuracy................................................................................
1-10
AC Current
Distortion...............................................................................
1-11
2 Theory of Operation
...........................................................................
2-1 
Introduction........................................................................................................
2-3
A1 LED
PCA.....................................................................................................
2-5
A3 Motherboard
PCA........................................................................................
2-5
Relay Control and Switch
Matrix..................................................................
2-5
LED Control and Output Cables
...................................................................
2-10
Signal Buses
..................................................................................................
2-10
Low Volt Buffer
............................................................................................
2-10
In-guard Power Supplies
...............................................................................
2-10
Outguard Power Supplies
..............................................................................
2-11
Miscellaneous Circuits
..................................................................................
2-11
Troubleshooting Test
Points..........................................................................
2-12
List of Fuses
..................................................................................................
2-13
A5 Ohms PCA
...................................................................................................
2-13
Precision Resistor
Networks..........................................................................
2-14
Relay Switch Matrix and
Control..................................................................
2-14
Other Control Circuits
...................................................................................
2-26
Guard Circuits
...............................................................................................
2-26
Compensation Circuits
..................................................................................
2-27
Monitor......................................................................................................
2-27
Diagnostics................................................................................................
2-29
A6 Digital Synthesis PCA
.................................................................................
2-33
Precision, Dual Tracking, +/-7 V
References................................................ 2-33
Precision, 28bit, PWM, Dual DAC’s
............................................................. 2-33
DC Voltage
Operation...................................................................................
2-34
DDS Waveform Generation
..........................................................................
2-34
AC Voltage
Operation...................................................................................
2-35
DC Current Operation
...................................................................................
2-35
AC Current Operation
...................................................................................
2-35
Thermocouple Temperature
Measurement....................................................
2-35
Iso-thermal Block Reference Junction Temperature Measurement
.............. 2-36
Thermocouple Voltage Measurement:
.......................................................... 2-36
Thermocouple Temperature
Simulation........................................................
2-36
Analog to Digital Converter
..........................................................................
2-36
Fault Detection
..............................................................................................
2-36
Digital
Control...............................................................................................
2-37
A7 Current
PCA.................................................................................................
2-37
Detailed Hardware Description of DC/AC
Current....................................... 2-40
Low Current Output
Amplifier......................................................................
2-40
Mid-Current Output Amplifier
......................................................................
2-41
High Current Output Amplifier
.....................................................................
2-42
High Current Amplifier Power Supplies (Mongo Supplies)
......................... 2-43
A8 High Voltage PCA
.......................................................................................
2-44
Detailed Hardware Description of the 22 V Amplifier
................................. 2-46
Detailed Description of the 220 V Amplifier
................................................ 2-47
Detailed Hardware Description of the High Voltage
Regulator.................... 2-49
Heat Sink Temperature Measurement
........................................................... 2-51
Digital Interface and
Control.........................................................................
2-51
A9 Out-Guard CPU
PCA...................................................................................
2-52
Real Time Clock Memory
.............................................................................
2-52
IEEE-488
Interface........................................................................................
2-52
3 Calibration and
Verification...............................................................
3-1 
Calibration
.........................................................................................................
3-3
Procedure
Architecture..................................................................................
3-3
ZERO
........................................................................................................
3-3
MAIN........................................................................................................
3-3
DIAG.........................................................................................................
3-3
Calibration Steps
...........................................................................................
3-3
RUN
..........................................................................................................
3-4
Instruction Step (INS)
...............................................................................
3-4
Reference Step (REF)
...............................................................................
3-4
NOT
..........................................................................................................
3-4
Verification
Tests...............................................................................................
3-5
Test
Equipment..............................................................................................
3-5
Calibrator Configuration and
Pre-check........................................................
3-6
DC Voltage Test
............................................................................................
3-7
AC Voltage Tests
..........................................................................................
3-9
AC Voltage Accuracy Test
.......................................................................
3-9
Frequency Accuracy
Test..........................................................................
3-10
DC Current Test
............................................................................................
3-14
AC Current Test
............................................................................................
3-15
Current Output Compliance
Test...................................................................
3-17
Voltage Output Compliance Test
..................................................................
3-17
Harmonic Test Levels for AC
Volts..............................................................
3-19
Harmonic AC Current Test
...........................................................................
3-21
External
Trigger.............................................................................................
3-21
Verification Test Check
List..........................................................................
3-22
4
Maintenance........................................................................................
4-1 
Introduction........................................................................................................
4-3
Replacing the
Fuse.............................................................................................
4-3
Cleaning the Air Filter
.......................................................................................
4-4
Replacing PCA Modules
...................................................................................
4-6
Cleaning the Exterior
.........................................................................................
4-7
5 List of Replaceable
Parts...................................................................
5-1 
Introduction........................................................................................................
5-3
How to Obtain
Parts...........................................................................................
5-3
Service Centers
..................................................................................................
5-4
Parts
Lists...........................................................................................................
5-4
6 Schematic Diagrams
..........................................................................
6-1
Fluke-6523-Manual-Page-1-Picture
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