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2638A Users Manual About this Manual This manual has seven chapters: • Chapter 1 supplies product information, safety information, contact information, and product specifications. • Chapter 2 supplies information and instructions on how to set up and configure the Product for first time use. • Chapter 3 supplies instructions on how to wire inputs to the Input Module then configure the associated channel. • Chapter 4 supplies information and instructions on how to do a scan, monitor a channel, and record measurement data. • Chapter 5 supplies instructions on how to operate the DMM function of the Product. • Chapter 6 supplies information on how to clean the Product and replace the fuse in the rear of the Product. • Chapter 7 supplies information on error messages and how to troubleshoot the Product. The Product Manual Set The Product manual set includes: • This 2638A Users Manual that contains feature information, operation instructions, and basic user maintenance and troubleshooting information. The Users Manual is translated into many languages. • The 2638A Safety Information is printed and contains important safety information for this Product. The Safety Information is translated into many languages. • The 2638A Remote Programmers Guide contains information on how to remotely operate the Product. The Programmers Guide alphabetically lists all commands and provides example code for different applications. • The 2638A Calibration Manual contains calibration and adjustment procedures to keep the Product within specifications. 1-10 MyFlukeStore Shop for Fluke products online at: www. .com 1.888.610.7664

Section	Page
2638A Users Manual	1
Warranty	2
Table of Contents	3
List of Tables	7
List of Figures	8
1. Product Overview and Specifications	9
Introduction	9
Product Overview	9
Front and Rear-Panel Overview	11
Safety Information	15
Screen Capture Feature	17
About this Manual	18
The Product Manual Set	18
How to Contact Fluke Calibration	19
Measurement Specifications	21
DC Voltage	21
DC Voltage Input Characteristics	21
DC Voltage Accuracy	21
DC Voltage Additional Errors	22
AC Voltage	22
AC Voltage Input Characteristics	22
AC Voltage Accuracy	23
Additional Low Frequency Errors	23
DC Current	23
DC Current Input Characteristics	23
DC Current Accuracy	24
DC Current Additional Errors	24
AC Current	24
AC Current Input Characteristics	24
AC Current Accuracy	25
Additional Low Frequency Errors	25
Frequency	25
Frequency Accuracy	25
Resistance	25
Resistance Input Characteristics	26
Resistance Accuracy	26
Resistance Additional Errors	26
RTD	26
RTD Temperature Accuracy	27
RTD Measurement Characteristics	27
Thermistor	27
Thermistor Temperature Accuracy	27
Thermistor Measurement Characteristics	28
Thermocouple	28
Thermocouple Temperature Accuracy	28
Thermocouple Measurement Characteristics	29
Digital I/O	29
Totalizer	29
Trigger	30
Alarm Output	30
2638A-100 Universal Input Module	30
General	30
2. Initial Setup and Configuration	31
Introduction	31
Set the Regional Voltage	31
Connect to Mains Power	33
Set the Handle Position	34
Power On and Standby	35
Warm-Up the Product	36
Configure the Product	36
Input Module and Relay Card Installation	37
Set Up Security	40
3. Input and Channel Configuration	41
Introduction	41
Input Wiring	41
The Universal Input Module	41
Wiring Safety and Considerations	42
3-Wire and 4-Wire Sense Input Configuration	43
Input Types and Wiring Diagrams	45
Input Wiring Instructions	46
Channel Configuration	47
About Channel Numbers	47
Basic Channel Operations	50
Open the Channel Setup Menu	50
Set Channels to ON or OFF	51
Verify a Channel	52
Zero a Channel	52
Copy a Channel	53
Save or Load a Channel Configuration (Setup File)	54
Reset the Channel and Test Configuration	56
Analog Channel Configuration (Ch001, Ch101 to Ch322)	56
Current and Voltage Channels	57
Resistance Channels	58
Thermocouple Channels	59
Frequency Channels	60
Thermistor Channels	61
PRT Channels	62
Digital I/O (DIO) Channel Configuration (Ch401)	63
Totalizer Channel Configuration (Ch402)	64
Read Mode	64
Debounce	64
Math Channel Configuration (Ch501 to Ch520)	66
Mx+B, Alarms, and Channel Options	69
Mx+B Scaling	69
HI and LO Channel Alarms	70
Channel Delay	72
Rate of Change	72
NPLC	73
Input Impedance	73
Bandwidth	73
Display As	73
Open Detect	73
4. Scan/Monitor, Record, and Data	74
Introduction	74
Scan	74
About Scan Timing and Sampling	76
Configure a Scan	78
Trigger Type	79
Auto Recording	80
File Destination	80
Sample Rate	80
Data Security	81
Temperature Unit	82
Align Channels	82
Automatic Power Loss Scan Resume	83
Basic Scan Procedures	83
Start a Scan	83
View Scan Data and Statistics	84
Graph the Measurements	85
Monitor	86
Record	87
Record Measurement Data	87
Memory Consumption for Recorded Data	88
Open and View Measurement Data on a PC	88
How to Read the Setup CSV File	90
How to Read the Data CSV File	92
5. DMM Operation	93
Introduction	93
About the DMM Function	93
Input Type Selection and Range Adjustment	94
More Functions (PT385 or PT392)	94
Relative Measurements	94
Graph the Measurements	95
Measurement Statistics	96
6. Maintenance and Care	97
Introduction	97
Clean the Product	97
Replace the Fuse	97
Memory Reset and Factory Reset	98
Firmware Update	99
User-Replaceable Parts and Accessories	101