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Setting an Offset Value, Using MX+B, To enter the M value

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8845A/8846A Users Manual Setting an Offset Value The offset function provides a means of displaying the difference between a measured value and a stored offset value. This type of measurement is referred to as a relative measurement. There are two methods of entering an offset value into the Meter. The first method is to enter a specified number into the offset register either through the front-panel or over the remote interface. Previously stored values are replaced with the new value. The offset value is stored in volatile memory and is set to zero when power is applied to the Meter or the Meter receives a reset through the remote interface. The second method is to measure the desired reference value through the Meter's input connections and press Z. The measured value is placed into the offset register and the display immediately starts showing the difference between measurements and the stored value. Note The Zero key cannot be used to zero a DB or DBM measurement. Refer to "Measuring AC Voltage" in Chapter 4 of this manual. To enter an offset value through the front-panel: 1. Press J 2. Press the MATH soft key 3. Press the OFFSETsoft key. To select the digit to adjust, press either . With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character. The right most character is the multiplier. This character can be set to p, n, µ, m, k, M, or G. 4. Press ENTER to set the value in the offset register. Using MX+B The MX+B function provides a means of calculating a linear value using a measured value (X) and two constants: M and B. The constant M represents a gain, while the constant B represents an offset. To make an mX+B calculation: 1. Press J. 2. Press the MATH soft key. 3. Press the mX+B soft key. To enter the M value: 4. Press the mX soft key To select the digit to adjust, press either . With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character. 5. Press ENTER to enter the M value. 6. Press Bto return to the MX+B menu. 3-12

Section	Page
8845A/8846A Digital Multimeter Users Manual	1
LIMITED WARRANTY AND LIMITATION OF LIABILIT	2
Table of Contents	3
List of Tables	7
List of Figures	9
1. Introduction and Specifications	11
Introduction	13
Manual Set	13
About this Manual	14
Safety Information	14
General Safety Summary	14
Symbols	16
Instrument Security Procedures	16
Volatile Memory	16
Non Volatile Memory	17
Media Memory (8846A Only)	17
Accessories	17
General Specifications	19
Power	19
Dimensions	19
Display	19
Environment	19
Safety	19
EMC	19
Triggering	19
Memory	20
Math Functions	20
Electrical	20
Remote Interfaces	20
Warranty	20
Electrical Specifications	20
DC Voltage Specifications	20
Input Characteristics	20
8846A Accuracy	21
8845A Accuracy	21
Additional Errors	21
AC Voltage Specifications	21
Input Characteristics	22
8846A Accuracy	22
8845A Accuracy	23
Additional Low Frequency Errors	23
Resistance	23
Input Characteristics	24
8846A Accuracy	24
8845A Accuracy	24
Additional Ohms Errors	24
DC Current	25
Input Characteristics	25
Accuracy (8846A)	25
Accuracy (8845A)	25
Additional Current Errors	25
AC Current	26
Input Characteristics	26
8846A Accuracy	26
8845A Accuracy	27
Additional Low Frequency Errors	27
Frequency	28
8846A Accuracy	28
8845A Accuracy	28
Gate Time vs. Resolution	28
Additional Low Frequency Errors	28
Capacitance (8846A Only)	29
Temperature (8846A only)	29
Additional Temperature Errors	29
Continuity	29
Diode Test	30
Measurement Rates	30
2. Preparing the Meter for Operation	31
Introduction	33
Unpacking and Inspecting the Meter	33
Contacting Fluke	33
Storing and Shipping the Meter	33
Power Considerations	33
Selecting the Line Voltage	34
Replacing the Fuses	34
Line-Power Fuse	34
Current-Input Fuses	35
Connecting to Line Power	37
Turning Power-On	38
Adjusting the Bail	38
Installing the Meter in an Equipment Rack	38
Cleaning the Meter	39
3. Front-Panel Operation	41
Introduction	43
Controls and Indicators	43
Front-Panel Feature Descriptions	43
Display Panel	44
Rear-Panel Connectors	46
Adjusting the Meter's Range	47
Navigating the Front-Panel Menu	47
Configuring the Meter for a Measurement	47
Setting the Display Resolution	47
Setting the AC Signal Filter	48
Setting Continuity Resistance Threshold and Diode Test Parameters	48
Setting the Continuity Threshold Resistance	48
Setting the Diode Test Voltage and Current	49
Setting the Default Temperature Scale (8846A Only)	49
Enabling Automatic Input Impedance	49
Using the Analyze Functions	49
Collecting Statistics on Measurements	50
Starting the Measurement Collection	50
Reading the Min, Max, Std. Dev. and Avg. Values	50
Stopping Measurement Collection	50
Testing Using Limits	51
Setting an Offset Value	52
Using MX+B	52
Using TrendPlot	53
Using the Histogram Function	54
Controlling Trigger Functions	55
Choosing a Trigger Source	55
Auto Triggering	55
External Triggering	55
Setting the Trigger Delay	56
Setting the Number of Samples	56
Understanding the Measurement Complete Signal	57
Accessing and Controlling Memory	57
Storing Readings in Memory	57
Recalling Readings from Memory	58
Storing Meter Configuration Information	58
Recalling a Meter Configuration	59
Managing Memory	60
Controlling System-Related Operations	61
Identifying Meter Errors	61
Querying the Firmware for Revision Level	61
Adjusting Display Brightness	61
Setting the Meter's Date and Time	61
Configuring the Remote Interface	62
Checking the Meter's Calibration Date	62
Resetting the Meter's Default Settings	62
4. Making Measurements	63
Introduction	65
Selecting Function Modifiers	65
Activating the Secondary Display	65
Measuring Voltage	66
Measuring DC Voltage	66
Measuring AC Voltage	67
Measuring Frequency and Period	68
Measuring Resistance	69
Making a Two-Wire Resistance Measurement	69
Making a Four-Wire Resistance Measurement	70
Measuring Current	71
Measuring DC Current	72
Measuring AC Current	73
Measuring Capacitance (8846A only)	74
Measuring RTD Temperature (8846A only)	75
Testing Continuity	76
Checking Diodes	76
Making a Triggered Measurement	77
Setting the Trigger Mode	78
Setting a Trigger Delay	78
Setting Number of Samples per Trigger	78
Connecting an External Trigger	79
Monitoring the Measurement-Complete Signal	79
Appendices	81
A. 2X4 Test Leads	83
B. Errors	85
C. RS-232 Port Connections	89

Match case Limit results 1 per page

8845A/8846A

Users Manual

3-12

Setting an Offset Value

The offset function provides a means of displaying the difference between a measured

value and a stored offset value. This type of measurement is referred to as a relative

measurement.

There are two methods of entering an offset value into the Meter. The first method is to

enter a specified number into the offset register either through the front-panel or over the

remote interface. Previously stored values are replaced with the new value. The offset

value is stored in volatile memory and is set to zero when power is applied to the Meter

or the Meter receives a reset through the remote interface.

The second method is to measure the desired reference value through the Meter’s input

connections and press

. The measured value is placed into the offset register and the

display immediately starts showing the difference between measurements and the stored

value.

Note

The Zero key cannot be used to zero a DB or DBM measurement. Refer to

“Measuring AC Voltage” in Chapter 4 of this manual.

To enter an offset value through the front-panel:

Press

Press the

MATH

soft key

Press the

OFFSET

soft key.

To select the digit to adjust, press either

<--

-->

With the desired digit selected, press the soft key labeled

to decrement the digit

to increment the character. The right most character is the multiplier. This

character can be set to p, n,

, m, k, M, or G.

Press

ENTER

to set the value in the offset register.

Using MX+B

The MX+B function provides a means of calculating a linear value using a measured

value (X) and two constants: M and B. The constant M represents a gain, while the

constant B represents an offset.

To make an mX+B calculation:

Press

Press the

MATH

soft key.

Press the

mX+B

soft key.

To enter the M value:

Press the

soft key

To select the digit to adjust, press either

<--

-->

With the desired digit selected, press the soft key labeled

to decrement the digit

to increment the character.

Press

ENTER

to enter the M value.

Press

to return to the MX+B menu.