ADCMT 7451A Operation Manual
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ADCMT 7451A Operation Manual

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Cover
7451A/61A/61P
Digital Multimeter
Operation Manual
FOE-00000061B00
MANUAL NUMBER
Applicable Models
7451A
7461A
7461P
First printing January 20, 2011
C
2011
ADC CORPORATION
All rights reserved.
Printed in Japan

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Summary of Contents for ADCMT 7451A

  • Page 1 Cover 7451A/61A/61P Digital Multimeter Operation Manual FOE-00000061B00 MANUAL NUMBER Applicable Models 7451A 7461A 7461P First printing January 20, 2011 2011 ADC CORPORATION All rights reserved. Printed in Japan...
  • Page 3 Certificate of Conformity Certificate of Conformity This is to certify, that Digital Multimeter 7451A / 7461A / 7461P instrument, type, designation complies with the provisions of the EMC Directive, 2004/108/EC in accordance with EN61326-1. and Low Voltage Directive, 2006/95/EC in accordance with EN61010.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS 7451A/7461A/7461P Digital Multimeter Operation Manual TABLE OF CONTENTS INTRODUCTION ..................Contents of this Manual ..................Product Overview ....................PRECAUTIONS ..................If a Fault Occurs ....................Removing the Case ................... Power Fuse ......................Electromagnetic Interference ................Note When Turning on the Power ..............
  • Page 6 7451A/7461A/7461P Digital Multimeter Operation Manual Table of Contents Menu ......................... 5.1.1 How to Navigate the Menus ............... 5.1.2 Menu List ....................Measurement Functions and Parameters ............5.2.1 DC Voltage Measurement (DCV) .............. 5.2.2 DC Voltage Measurement (DCV-Bch) ............5.2.3 Continuity Measurement ................
  • Page 7 7451A/7461A/7461P Digital Multimeter Operation Manual Table of Contents HOW TO USE THE INTERFACE ............Interface Selection ..................... 6.1.1 Response to the *IDN? Command (7451A/61A Only) ......GPIB ........................6.2.1 Overview ....................6.2.2 Precautions in Use of GPIB ................ 6.2.3 GPIB Setting ....................
  • Page 8 7451A/7461A/7461P Digital Multimeter Operation Manual Table of Contents MAINTENANCE ..................Replacing Fuses ....................8.1.1 Replacing a Power Fuse ................8.1.2 Replacing a Protection Fuse ............... Cleaning ......................8.2.1 Cleaning the Outside .................. 8.2.2 Cleaning Others ..................Calibration ......................8.3.1 Preparing for Calibration ................
  • Page 9 7451A/7461A/7461P Digital Multimeter Operation Manual LIST OF ILLUSTRATIONS Title Page Operating Environment ..................... Electrostatic Countermeasures for the Work Floor and Human Body ......Electrostatic Countermeasures for the Workbench ............Indication of the Set Power Supply Voltage ..............Connecting the Power Cable .....................
  • Page 11 7451A/7461A/7461P Digital Multimeter Operation Manual LIST OF TABLES Title Page Standard Accessories ......................ESD Countermeasures ...................... Accessories ........................Relation Table between AC Power Supply Voltage and Indication of Set Power Supply Voltage 3-8 Maximum Allowable Applied Voltage (DCV) ..............Range and Input impedance (DCV) ..................
  • Page 12 7451A/7461A/7461P Digital Multimeter Operation Manual List of Tables Title Page Fuse Rating and Compliant Standard ................Calibration Point (7461A/61P) ..................Calibration Point (7451A) ....................Parts with Limited Life ..................... 8-11 Disposal ..........................8-12 Initial Values of Setting Parameters ................. 8-16 Self-Test Items ........................

  • Page 13: Introduction

    7451A/7461A/7461P Digital Multimeter Operation Manual 1. INTRODUCTION INTRODUCTION This chapter describes the contents of this manual and the product overview of the 7451A/7461A/7461P Dig- ital Multimeter. Contents of this Manual This manual can be used by novices or experienced users of this instrument. This manual can be read from Chapter 1 to learn more about this instrument or it can be used as a reference.

  • Page 14: Product Overview

    High sensitivity: 0.1 V (7461A/7461P) and 1 V (7451A) in the DC voltage measurement • • Wide dynamic range: 1 nA to 3 A (7461A/7461P) and 10 nA to 3 A (7451A) in the DC current mea- surement • Low power resistance measurement function that reduces the self-heating effect of the device •...

  • Page 15: Precautions

    7451A/7461A/7461P Digital Multimeter Operation Manual 2. PRECAUTIONS PRECAUTIONS This chapter describes precautions when using this instrument. Read this chapter before using this instru- ment. CAUTION: Using this instrument while it is stood on end or stacked with other products is unstable and danger- ous.

  • Page 16: Note When Turning On The Power

    7451A/7461A/7461P Digital Multimeter Operation Manual 2.5 Note When Turning on the Power Note When Turning on the Power When turning on the power, do not connect any DUTs.

  • Page 17: Setup

    7451A/7461A/7461P Digital Multimeter Operation Manual 3. SETUP SETUP This chapter describes how to set up this instrument on delivery. The following topics are covered in this chapter. 3.1 Inspection on Delivery 3.2 Installation Environment 3.3 Accessories 3.4 Power Requirements Inspection on Delivery After receiving the product, inspect the outside and the accessories according to the following procedure.

  • Page 18: Standard Accessories

    7451A/7461A/7461P Digital Multimeter Operation Manual 3.1 Inspection on Delivery Table 3-1 Standard Accessories Name Model Quantity Remarks Power cable A01402 Input cable (Red, Black) CC010001 Each 1 Alligator clip adapter (Red, Black) CC015001 Each 1 Power Fuse (For 100V/120V) DFT-AAR25A-1...

  • Page 19: Installation Environment

    7451A/7461A/7461P Digital Multimeter Operation Manual 3.2 Installation Environment Installation Environment This section describes the environment into which this instrument should be installed. 3.2.1 Operating Environment Install this instrument in an environment in which the following conditions are satisfied. Ambient temperature: 0 C to +50 C (operating temperature) •...

  • Page 20: Protecting Against Electrostatic Discharge

    7451A/7461A/7461P Digital Multimeter Operation Manual 3.2.2 Protecting Against Electrostatic Discharge 3.2.2 Protecting Against Electrostatic Discharge To prevent semiconductors from being damaged by electrostatic discharge (ESD), the precautions shown below should be taken. We recommend combining two or more countermeasures to prevent damage from ESD.

  • Page 21: Accessories

    7451A/7461A/7461P Digital Multimeter Operation Manual 3.3 Accessories Accessories The accessories of this instrument are shown in Table 3-3. This section describes the accessories necessary to use this instrument. Table 3-3 Accessories Name Model Remarks Input cable CC010001 Standard Accessory A01001...
  • Page 22 7451A/7461A/7461P Digital Multimeter Operation Manual 3.3.1 Input Cable Barrier Probe Protect tip Alligator clip adapter To reduce the effects of short-term stability in high resistance (in the order of M) or high sensitivity (in the order of V) measurements, use the optional input cable A01001 in which the HI side is shielded.

  • Page 23: Caution When Connecting Peripherals

    7451A/7461A/7461P Digital Multimeter Operation Manual 3.3.2 Caution when Connecting Peripherals 3.3.2 Caution when Connecting Peripherals When making up a system, which consists of two or more devices, be careful of the following: Before connecting this instrument to a controller and peripherals, check that each device operates cor- rectly according to each manual.

  • Page 24: Power Requirements

    7451A/7461A/7461P Digital Multimeter Operation Manual 3.4 Power Requirements Power Requirements This section describes power requirements and how to connect the power cable. 3.4.1 Checking the Power Supply Voltage Check that the power supply voltage setting on the rear panel of this instrument accords with the AC power supply voltage to be used.

  • Page 25: 3.4.2 Changing The Power Supply Voltage

    7451A/7461A/7461P Digital Multimeter Operation Manual 3.4.2 Changing the Power Supply Voltage 3.4.2 Changing the Power Supply Voltage Remove the fuse holder assembly from the rear panel. Push both side of the fuse holder assembly by using flathead screwdrivers ( and then pull it out ( Remove the power supply voltage selector from the fuse holder assembly.
  • Page 26 7451A/7461A/7461P Digital Multimeter Operation Manual 3.4.2 Changing the Power Supply Voltage Replace the fuse holder assembly into the rear panel. Check that the correct power supply voltage is indicated in the window. 3-10...

  • Page 27: Connecting The Power Cable

    7451A/7461A/7461P Digital Multimeter Operation Manual 3.4.3 Connecting the Power Cable 3.4.3 Connecting the Power Cable This instrument includes a three-core power cable with a grounding conductor. To prevent accidents caused by electric shocks, only use the included power cable and securely connect to the ground through a three-pin power outlet.

  • Page 29: Quick Start

    7451A/7461A/7461P Digital Multimeter Operation Manual 4. QUICK START QUICK START The high speed measurement and high accuracy measurement can be performed in this digital multimeter. To make the performing operations easier, this instrument includes the following functions on the front panel.

  • Page 30: Display Section Description

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.1.1 Front Panel Description 4.1.1.1 Display Section GPIB address (My Address) Remote control Sampling indicator Calibration Sampling hold Numerical value display section Unit display section mode Sampling rate setting Fast M: Medium Slow RCL:Recall setting...

  • Page 31: Measurement Range Selection Keys

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.1.1 Front Panel Description LP-2W/LP-4W (SHIFT + 2W/4W Selects the low power resistance measurement. Either 2W or 4W can be selected. (SHIFT + DCI) Selects the diode measurement ( 11. AC + DC (SHIFT + ACI) Selects the AC+DC coupling or AC coupling in the AC current measurement.

  • Page 32: Shift/Exit/Local Key

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.1.1 Front Panel Description 4.1.1.8 SHIFT/EXIT/LOCAL Key SHIFT Sets or cancels the SHIFT mode. • In the setting mode EXIT Exits from MENU and returns to the measurement state display. (The data in process of changing the setting is not saved.) •...

  • Page 33: Rear Panel Description

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.1.2 Rear Panel Description 4.1.2 Rear Panel Description Figure 4-3 Rear Panel Description Power connector Used to supply the AC power by connecting the included power cable (A01402). Fuse holder assembly The power supply voltage can be selected from 100 V, 120 V, 220 V, and 240 V.

  • Page 34: Basic Operation

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2 Basic Operation Basic Operation When the power is turned on, this instrument automatically performs the self-test and then proceeds to the measurement sequence. For more information on the detail of the self-test, refer to Chapter 8, “MAINTENANCE.”...

  • Page 35: Dc Voltage Measurement (Dcv-Bch)

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions DC voltage measurement (DCV-Bch) Press SHIFT ‘BDC’ is displayed. The measurement is performed between Bch HI and COM terminals in the fixed range of 10 V. Table 4-3 Maximum Allowable Applied Voltage (DCV-Bch)

  • Page 36: Ac Voltage Measurement (Acv And Acv(Ac+Dc))

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions AC voltage measurement (ACV and ACV(AC+DC)) ACV measurement Press AC voltage with AC coupling is measured. Pressing continuously switches the AC filter in turn. ACV(AC+DC) measurement Press SHIFT ACV and DCV are measured and the root mean square value ( +DCV is displayed.

  • Page 37: Resistance Measurement (2W, 4W, Lp-2W, And Lp-4W)

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions Table 4-7 Measurement range 7461A/61P 7451A Measurement method TrueRMS Measurement range 5% or more of the range Crest factor  1000Vpeak AC700Vrms or less 2.2  10  500V or less Figure 4-6 AC Voltage Measurement (ACV and ACV(AC+DC)) Resistance measurement (2W, 4W, LP-2W, and LP-4W)

  • Page 38: Maximum Allowable Applied Voltage (2W, 4W, Lp-2W, Lp-4W)

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions Table 4-8 Maximum Allowable Applied Voltage (2W, 4W, LP-2W, LP-4W) Between  and COM 1000 Vpeak *1 Between 4WHI and LO 200 Vpeak Between 4WHI/LO and COM 200 Vpeak Between COM and chassis...

  • Page 39: Dc Current Measurement (Dci)

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions DC current measurement (DCI) Press Maximum allowable applied current WARNING: Must not measure the current source whose potential is more than 250 V. This instrument may be damaged and injury accidents may be caused.

  • Page 40: Ac Current Measurement (Aci And Aci(Ac+Dc))

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions AC current measurement (ACI and ACI(AC+DC)) ACI measurement Press AC current with AC coupling is measured. Pressing continuously switches the AC filter in turn. ACI(AC+DC) measurement Press SHIFT ACI and DCI are measured and the root mean square value (...
  • Page 41 7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions Table 4-10 Measurement Range 7461A/61P 7451A Measurement method TrueRMS Measurement range 5% or more of the range Crest factor *1 Except for the 3 A range DC 3A or less AC3Arms or less ...
  • Page 42 7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions Continuity measurement ( FREQ Press SHIFT The resistance is measured in 2W. If the measured resistance is lower than the continuity threshold constant, the buzzer sounds. Table 4-11 Continuity Measurement 7461A/61P 7451A 1000 ...

  • Page 43: Diode Measurement

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions Diode measurement ( Press SHIFT The voltage between the terminals is measured while the current of about 1 mA is applied to the diode. Table 4-12 Diode Measurement 7461A/61P 7451A Measurement range...

  • Page 44: Maximum Allowable Applied Voltage (Freq)

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions Frequency measurement (FREQ) FREQ Press The frequency in the ACV measurement function is displayed. The DC component of the input signal is cut by using the AC coupling and the frequency is measured at the zero-cross point.

  • Page 45: Display Resolution

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions 10. Temperature measurement (TEMP-2W, TEMP-3W, TEMP-4W) TEMP Press The temperature is measured by using the 2W, 3W or 4W (formerly set method). Table 4-14 Temperature Measurement Resistance bulb Pt100 JPt100 -200 C to +850 C -200 C to +649 C...
  • Page 46 7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.1 Measurement Functions Current (a) 2W measurement Current (b) 3W measurement Current (c) 4W measurement Figure 4-13 Temperature Measurement 4-18...

  • Page 47: Setting The Measurement Range

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.2 Setting the Measurement Range 4.2.2 Setting the Measurement Range Increases the measurement range by one level and fixes the range. DOWN Decreases the measurement range by one level and fixes the range. AUTO Switches the measurement range between auto-range and fixed range.

  • Page 48: Sampling Rate And Display Digits

    7451A/7461A/7461P Digital Multimeter Operation Manual 4.2.3 Setting the Sampling Rate Table 4-17 Sampling Rate and Display Digits Function DCV/DCI DCV-Bch 2W/4W ACV(AC+DC) LP-2W/4W ACI(AC+DC) ACV/ACI Diode/Continuity Sampling rate 7461A/61P 7451A 7461A/61P 7451A FAST1, FAST2 4 1/2-digit display 4 1/2-digit display...

  • Page 49: Menu Operation And Function Description

    7451A/7461A/7461P Digital Multimeter Operation Manual 5. MENU OPERATION AND FUNCTION DESCRIPTION MENU OPERATION AND FUNCTION DESCRIPTION Menu The functions and conditions in this instrument are set by using layered menus. 5.1.1 How to Navigate the Menus Menus have a three-layer structure. (Some menus have a four-layer structure.)
  • Page 50 7451A/7461A/7461P Digital Multimeter Operation Manual 5.1.1 How to Navigate the Menus Press MENU The Category layer in which be selected is displayed. 1 MEAS 9 SYS Select the category by using Press The Selection layer is displayed. Select the parameters by using Press The Entry/Execution layer is displayed.

  • Page 51: Menu Operation Key And Function

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.1.1 How to Navigate the Menus Table 5-1 Menu Operation Key and Function Entry/Execution layer Numerical value parameter Category layer Selection layer Selectable parameter/ Parameter: Dark display, Target items: Numerical execution item No blinking value/decimal point/unit...

  • Page 52: Menu List

    OFF/ON/ONCE IT SEC Integration time (sec) 10 sec to 10 sec (For 7461A/61P) 100 sec to 10 sec (For 7451A) IT PLC Integration time (PLC) 0.02 PLC to 100 PLC When the integration time is outside this range, it is set in seconds.
  • Page 53 N.Smpl Number of samples 1 to 16000 Sampling interval 50 s to 3600 s (For 7461A/61P) 200 s to 3600 s (For 7451A) Trigger source Selection IMMED/MAN/EXT/BUS/LEVEL/DELTA LEVEL Level count value (For the trigger source is set to only LEVEL)
  • Page 54 7451A/7461A/7461P Digital Multimeter Operation Manual 5.1.2 Menu List Category layer Selection layer Entry/Execution layer HIGH HIGH constant 4 CONST -9999.999E+9 to 9999.999E+9 (For 7461A/61P) -999.999E+9 to 999.999E+9 (For 7451A) LOW constant -9999.999E+9 to 9999.999E+9 (For 7461A/61P) -999.999E+9 to 999.999E+9 (For 7451A) ...
  • Page 55 7451A/7461A/7461P Digital Multimeter Operation Manual 5.1.2 Menu List Category layer Selection layer Entry/Execution layer Interface selection 8 I/F GPIB/USB GP.Adr GPIB address (Only when GPIB is selected for the interface) 0 to 30 USBid USB ID (Only when USB is selected for the interface)
  • Page 56 7451A/7461A/7461P Digital Multimeter Operation Manual 5.1.2 Menu List Category layer Selection layer Entry/Execution layer WIRE Measurement wire connection 10 TEMP 2W/3W/4W * 7461P only TYPE Platinum resistance bulb selection PT/JPT UNIT Temperature unit C/F/K...

  • Page 57: Measurement Functions And Parameters

    The input impedance in the following range can be selected from HiZ and 10 M. 100 mV, 1000 mV, and 10 V ranges (7461A/61P) 300 mV and 3000 mV ranges (7451A) Select HiZ or 10 M from ‘ZIn’ in 1 MEAS...

  • Page 58: Continuity Measurement

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.2.3 Continuity Measurement 5.2.3 Continuity Measurement Setting the continuity threshold constant The continuity threshold constant can be selected in the range between 1  and 1000  from ‘BEEP’ in 1 MEAS category in MENU...

  • Page 59: Measurement Range And Auto-Range

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.3 Measurement Range and Auto-Range Measurement Range and Auto-Range 5.3.1 Measurement Function and Range Structure Table 5-2 shows the range structure corresponding to the measurement function. Table 5-2 Measurement Function and Range Structure 2W/ LP-2W/...

  • Page 60: Auto-Range

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.3.2 Auto-range 5.3.2 Auto-range When Auto-range is set to ON, the measurement range of this instrument automatically changes to the optimum range depending on the input voltage. The judgment value used when the range is changed...

  • Page 61: Auto-Zero Operation

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.4 Auto-Zero Operation Auto-Zero Operation Auto-zero function eliminates the offset error in the measurement system of this instrument. Set Auto-zero in ‘A.Zero’ in 1 MEAS MENU If Auto-zero is set to ON, the internal offset is measured and the offset error is eliminated because the offset is subtracted from the input measurement value.

  • Page 62: Display Mode Setting

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.5 Display Mode Setting If ONCE is set and Auto-zero is performed, the offset error is eliminated and then Auto-zero is turned off. If the resolution and measurement speed are changed by using the RATE key, Auto-zero is switched ON or OFF.

  • Page 63: Sampling Operation

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.7 Sampling Operation Sampling Operation Figure 5-2 shows the measurement sequence of this instrument. Measurements are performed when the trigger event is received. When each measurement is complete, the COMPLETE signal is output and the data output starts.

  • Page 64: Sampling Interval (Si) And Integration Time (It) Settings

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.7.1 Sampling Interval (SI) and Integration Time (IT) Settings 5.7.1 Sampling Interval (SI) and Integration Time (IT) Settings The integration time and sampling interval can be set by using MENU as well as the RATE key on the front panel.

  • Page 65: Setting Range Of Sampling Interval (Si)

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.7.1 Sampling Interval (SI) and Integration Time (IT) Settings Table 5-5 shows the setting range of the sampling interval. Table 5-5 Setting Range of Sampling Interval (SI) 7461A/61P 7451A Setting range Setting range 50 s to 3600 s 200 s to 3600 s...

  • Page 66: Sampling Count Setting

    When data is stored in the measurement data memory in conjunction with this setting on the 7461A or 7451A, the number of data to be stored is up to 10,000 even if the number of sampling is set to more than 10,000.

  • Page 67: Trigger Function

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.8 Trigger Function Trigger Function The trigger system of this instrument allows trigger detection, the sampling start to be delayed, and multiple samplings per trigger. Figure 5-3 shows the trigger model. IDLE state :ABORt *RST...

  • Page 68: Trigger System Operation

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.8.1 Trigger System Operation 5.8.1 Trigger System Operation IDLE state The trigger system is in the IDLE state before the trigger sequence starts, after the trigger sequence is terminated, and while the processes of this system are not performed such as a reset state.

  • Page 69: Trigger Source Selection

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.8.2 Trigger Source Selection 5.8.2 Trigger Source Selection The trigger source is selected in 'SRC' in the 2 TRIG category in MENU Trigger source IMMED Performs the continuous measurement at the timing of the sampling interval in this instrument.
  • Page 70 7451A/7461A/7461P Digital Multimeter Operation Manual 5.8.2 Trigger Source Selection [Measurement timing according to the trigger source] A: HOLD: OFF 1. TRIGger:Source:IMMediate Measurement Measurement Measurement Measurement Complete Complete Complete Complete SI=TRIGger:TIMer<n> TRIGger:DELay is invalid. HOLD: ON 2. TRIGger:Source:MANual Example of Cs = 4...

  • Page 71: Trigger Delay (Td)

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.8.3 Trigger Delay (Td) Level trigger/Delta trigger 5. TRIGger:Source:LEVel (Memory store: ON, Auto-range: OFF, automatically set) Count depending on Cs and PT Trigger Key TRIG detection or *TRG Measurement Measurement Measurement Measurement Measurement Measurement Measurement...

  • Page 72: Trigger Count Setting

    Procedure Set the trigger source to LEVEL or DELTA. Set the sampling count. (7451A/61A: up to 10000, 7461P: up to 16000) Set the parameter for detecting a trigger level.(LEVEL, SLOPE, DELTA, PATRN) The measurement in the set sampling interval starts when the...

  • Page 73: Level Trigger

    Set LEVEL to 500000 when setting the threshold level to 5.00000 V in DCV 10V range of the 7461A. If the setting exceeds the maximum display, the trigger cannot be detected. Example: When LEVEL is set to 200000 in DCV-Bch of the 7451A. 5-25...

  • Page 74: Delta Trigger

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.8.5 Level Trigger and Delta Trigger 5.8.5.2 Delta Trigger An event is detected when the difference between delta 1 and delta 2 exceeds the set DELTA (threshold value). Example: SLOPE:POSI, PATRN:CONV The trigger is detected when 1 is larger than DELTA and 2 is smaller than DELTA.

  • Page 75: Delta Trigger Detection Pattern

    If the setting exceeds the maximum display, the trigger cannot be detected. Example: When DELTA is set to 200000 in DCV-Bch of the 7451A. The trigger is detected when the polarity of change and direction of change judgment conditions are satis- fied (refer to Table 5-8).

  • Page 76: Pre-Trigger Operation

    Although the data before the trigger event is stored in the measurement data memory by setting the pre- trigger, the total data amount cannot exceed the capacity of the data memory. The 7451A/61A stores up to 10000 data and the 7461P stores up to 20000 data.

  • Page 77: Calculation Functions

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.9 Calculation Functions • Memory recall Reads out the number of measurement results IRPO? Outputs the number of valid measurement results. Example of reply: IRPO01000 Reads out the data range IRNO? Outputs the range of valid data.

  • Page 78: Calculation System Diagram

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.9 Calculation Functions Calculation Smoothing Measurement NULL Comparator Scaling Results data Number of data Statistics Data memory Maximum value Minimum value Average value Standard deviation Dispersion MAX/MIN Number of data Maximum value Minimum value Average value...

  • Page 79: Null Calculation

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.1 NULL Calculation 5.9.1 NULL Calculation Function The NULL calculation subtracts the NULL constant from the measurement value and outputs the re- sult. Measurement data output = Measurement value - NULL constant Pressing the key performs the calculation and turns on the NULL lamp in the display sec- NULL tion.

  • Page 80: Smoothing Calculation

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.2 Smoothing Calculation • Decimal point Change the setting value by using at the blinking position. The unit prefix is switched according to the following order. p  n    m  No unit prefix  k  M  G  T Press to apply the setting.
  • Page 81 7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.2 Smoothing Calculation When the smoothing count, N, is set to 3, the operation is as follows. Smoothing start Measured value Measurement value output (D3+D4)/2 (D3+D4+D5)/3 (D4+D5+D6)/3 (D5+D6+D7)/3 The SM The SM lamp blinks. lamp turns on.
  • Page 82 7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.2 Smoothing Calculation Canceling the smoothing calculation The smoothing calculation is canceled when any of the following conditions occur. • The key is pressed while the smoothing calculation is performed. • The measurement function is changed.

  • Page 83: Scaling Calculation

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.3 Scaling Calculation 5.9.3 Scaling Calculation Function The scaling calculation equation is shown below. Measurement value M - Constant B  Constant C Display = Constant A When SCL is selected from the MATH item in...
  • Page 84 7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.3 Scaling Calculation Setting the numerical value of the constant The setting ranges of Constants A, B, and C are shown below. Minimum Constant Setting range resolution 0.000001E - 9 7461A/61P -9999999.E +6 to +9999999.E + 6 0.000000E - 9...

  • Page 85: Db And Dbm Calculation

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.4 dB and dBm calculation 5.9.4 dB and dBm calculation Function The dB calculation, in which the decibel conversion is performed, can be performed only in the volt- age and current measurements. The dBm calculation, which is useful to calculate the power gain per 1 mV, can be performed only in the voltage measurement.
  • Page 86 7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.4 dB and dBm calculation Setting Constant D The setting range of Constant D is shown below. Setting range Minimum resolution 7461A/61P 0.000001E -9 to 9999999.E + 6 0.000001E - 9 7451A 0.000001E -9 to 999999.E + 6 The exponential part is set by using a unit prefix (p, n, , m, k, M, G, T).

  • Page 87: Comparator Calculation

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.5 Comparator Calculation 5.9.5 Comparator Calculation Function The comparator calculation equation is shown below. HI = (Measurement value > HI setting value) LO = (Measurement value < LOW setting value) GO = (LOW setting value  Measurement value  HI setting value) (Processing the special data) •...
  • Page 88 7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.5 Comparator Calculation Setting the numerical value of the constant The setting ranges of the High and Low constants are shown below. Constant Setting range Minimum resolution High 7461A/61P -9999999.E +6 to +9999999.E + 6 0.0000001E - 9...
  • Page 89 7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.5 Comparator Calculation PASS condition setting In the PASS condition setting, each comparator calculation result (HI, GO, and LO) is specified as either PASS or not. For example, if HI is specified as the PASS condition and LO and GO are not specified as the PASS conditions, the comparator measurement result of HI is judged as PASS.

  • Page 90: Max/Min Calculation

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.6 MAX/MIN Calculation 5.9.6 MAX/MIN Calculation Function This function calculates the maximum, minimum, and average values while the MAX/MIN calculation is performed. The following calculations are performed at the same time in the MAX/MIN cal- culation.
  • Page 91 7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.6 MAX/MIN Calculation How to call the MAX/MIN calculation result Select RSLT in MENU to see the calculation results display. MENU ..3.. CALC RSLT Measurement count Maximum value Minimum value Average value Select a display item by pressing The measurement count, maximum value, minimum value, and average value are displayed in this order.

  • Page 92: Statistical Calculation

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.7 Statistical Calculation 5.9.7 Statistical Calculation Function This function calculates the maximum value, minimum value, average value, standard deviation, and range of the measurement data that is stored in the mea- surement memory. The following calculations are performed at the same time in the statistical cal- culation.
  • Page 93 7451A/7461A/7461P Digital Multimeter Operation Manual 5.9.7 Statistical Calculation How to call the calculation result The display item of the calculation results can be selected in STAT in MENU MENU ..7.. MEM SAMPL (Number of samples) STAT (Maximum value) (Minimum value)

  • Page 94: 5.10 Saving And Loading The Measurement Condition Settings

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.10 Saving and Loading the Measurement Condition Settings 5.10 Saving and Loading the Measurement Condition Settings In this instrument, four files of measurement condition setting parameters can be saved in non-volatile mem- ory USER0 to USER3.

  • Page 95: 5.11 Storing And Recalling The Measurement Data

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.11 Storing and Recalling the Measurement Data 5.11 Storing and Recalling the Measurement Data This instrument includes the measurement data memory, in which the following number of measurement results can be stored. • 7451A/61A: 10000 data •...

  • Page 96: 5.12 System Settings

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.12 System Settings 5.12 System Settings 5.12.1 Buzzer Setting Select ON or OFF in ‘BEEP’ in 9 SYS MENU The buzzer sounds. The buzzer does not sound. The buzzer does not sound regardless of the result of comparator calculation.

  • Page 97: Relationship According To Disabling The Function

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.12.3 Disabling Functions using Press ENTER to apply the setting. • The relationship according to disabling the function setting Although the ENA or DIS can be set for each function, some functions are automatically disabled depending on the settings of other functions.

  • Page 98: Front Panel Disabling Function

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.12.4 Front Panel Disabling Function 5.12.4 Front Panel Disabling Function This function disables all panel keys on the front panel in this instrument. The following shows how to set the front panel disabling function. Password setting The password is required to enable or disable the front panel keys.
  • Page 99 7451A/7461A/7461P Digital Multimeter Operation Manual 5.12.4 Front Panel Disabling Function Panel lock setting Set the panel lock according to the following procedure. Character Operation display section MENU MENU Press and select 9 SYS by using Press BEEP Select ‘P.Lock’ by using P.Lock...

  • Page 100: Error Queue

    7451A/7461A/7461P Digital Multimeter Operation Manual 5.12.5 Error Queue Canceling the panel lock Cancel the panel lock according to the following procedure. Character Operation display section 1. If pressing any key while the panel lock is set, the entry layer of P.Lock is set.

  • Page 101: How To Use The Interface

    6.1.1 Response to the *IDN? Command (7451A/61A Only) This instrument has changed its model name from “AD7451A/AD7461A” to “7451A/7461A.” Accord- ingly, the response to the *IDN? command has also been changed. Note that an old model name response can also be set to maintain the compatibility with the application software.
  • Page 102 7451A/7461A/7461P Digital Multimeter Operation Manual 6.1.1 Response to the *IDN? Command (7451A/61A Only) Specification of response to *IDN? New model name ADC Corp.,xxxxx,nnnnnnnnn,mmm response xxxxx: 7451A or 7461A (Product model name) nnnnnnnnn: Serial No. mmm: Revision No. Old model name...

  • Page 103: Gpib

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.2 GPIB GPIB 6.2.1 Overview The automatic measurement system can be set up easily by using GPIB (General Purpose Interface Bus) because measurement functions and parameters can be set and measurement data can be read by using the external control.

  • Page 104: 6.2.2 Precautions In Use Of Gpib

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.2.2 Precautions in Use of GPIB 6.2.2 Precautions in Use of GPIB Do not use too long a bus cable to connect any instrument or controller. Ensure that the total cable length does not exceed 20 m. ADC CORPORATION uses the following cables as the standard bus cable.

  • Page 105: Gpib Setting

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.2.3 GPIB Setting 6.2.3 GPIB Setting The following setting menu can be used when the GPIB is selected as the interface. Address setting Operations Display MENU MENU Press and select by using 8 I/F Press ENTER to move to the I/F category layer.
  • Page 106 7451A/7461A/7461P Digital Multimeter Operation Manual 6.2.3 GPIB Setting Talk-Only setting Operations Display MENU MENU Press and select 8 I/F by using the keys. Press ENTER to move to the I/F category layer. Select BUS by using the keys. Press to move to the BUS selection layer.

  • Page 107: Usb

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.3 USB 6.3.1 Overview A USB (Universal Serial Bus), which is compliant with the USB2.0 Full Speed, is included in this instru- ment as standard. By connecting multiple instruments to the USB ports on a personal computer, the functions of the instru- ments can be set, measurement data can be read from the personal computer, and the automatic measure- ment system can be set up easily.

  • Page 108: Usbid Setting

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.4 Control Signal 6.3.3.2 USBid Setting The USBid setting menu can be used when USB is selected for the interface. Enter any address from 1 to 127 in ‘USBid’ in 8 I/F MENU Press ENTER to apply the setting.

  • Page 109: Measurement Complete Signal Terminal (Complete Out)

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.4.2 Measurement Complete Signal Terminal (COMPLETE OUT) 6.4.2 Measurement Complete Signal Terminal (COMPLETE OUT) A negative logic pulse is output from the measurement complete signal terminal (COMPLETE OUT) on the rear panel when the measurement is complete.
  • Page 110 7451A/7461A/7461P Digital Multimeter Operation Manual 6.4.2 Measurement Complete Signal Terminal (COMPLETE OUT) Complete signal output timing The typical value of the complete signal output timing under the following setting conditions is shown. Function: DCV, Auto-zero: OFF, Auto-range: OFF Single output Time from the trigger signal input at the external trigger terminal to the complete signal output: Tc Tc=Tin ...
  • Page 111 7451A/7461A/7461P Digital Multimeter Operation Manual 6.5 Comparator Output Comparator Output The comparator calculation result is output from the comparator output terminal (COMPARATOR) on the rear panel as the TTL signal and the optical semiconductor relay contact signal. Specifications Connector D-Sub9 pin...

  • Page 112: 6.5 Comparator Output

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.5 Comparator Output The calculation result signals of Hi, Go, and Lo are output to the signal output pins of HI, PASS, and LO. The output to the PASS pin depends on the PASS conditions as shown in Table 6-3 and Table 6-4.

  • Page 113: Digital Output (7461P Only)

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.6 Digital Output (7461P Only) Digital Output (7461P Only) The TTL signal or the optical semiconductor relay contact signal can be output arbitrarily from the compar- ator output terminal (COMPARATOR) on the rear panel by using the remote commands.

  • Page 114: Signal Output Pin

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.6 Digital Output (7461P Only) Table 6-6 SCPI Commands Command Description :DOUTput:STATe {OFF|ON} Digital output disabled/enabled :DOUTput:STATe? Query of digital output :DOUTput:BITS {0-31} Digital output setting Controls arbitrarily the TTL signal or relay contact signal corresponding to 5 bits.

  • Page 115: Command Reference

    SCPI: SCPI Command (GPIB only) ADC: Command used in ADC CORPORATION (GPIB/USB only) R6552: Command used in ADC CORPORATION's R6552 (only 7451A, GPIB only) For more information on operations, refer to “R6552 Series Digital Multimeter Operation Manual”. 6.7.1.1 Compatibility If the R6552 command is selected, this instrument receives the R6552 command and executes it.

  • Page 116: Output Data Format

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.2 Output Data Format Command enabled when Command disabled when R6552 is selected R6552 is selected STP n RCLP n BZ n Note that the descriptions of the sampling rate setting commands vary depending on the selected language...
  • Page 117 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.2 Output Data Format With header S DD...DD EDD , S DD...DD EDD , Without header In the above case, header (1) and space (2) are not output. Main header of 3 characters ( ) + Sub header of 1 character (...
  • Page 118 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.2 Output Data Format Sub header Description Priority Error information Range over Calculation Scaling error Err D (dB/dBm calculation error) Calculation result infor- Comparator result HIGH mation MAX data MIN data dB data dBm data...
  • Page 119 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.2 Output Data Format Measurement data • 7461A/61P  E (6 1/2-digit display) 9.999999E+37 Overload (OL) 9.999999E+36 OVER of the scaling calculation result 9.999999E+35 dB/dBm calculation error • 7451A  E (5 1/2-digit display) 9.99999E+37 Overload (OL) 9.99999E+36...
  • Page 120 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.2 Output Data Format 7461A/61P 7451A 30  dd.ddddE+00 2W 2W 100  ddd.ddddE+00 300  ddd.dddE+00 1000  dddd.dddE+00 3000  dddd.ddE+00 dd.dddddE+03 dd.ddddE+03 10 k 30 k ddd.ddddE+03 ddd.dddE+03 100 k 300 k...
  • Page 121 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.2 Output Data Format 7461A/61P 7451A FREQ (<10 Hz) (d.dddddE+00) FREQ (<10 Hz) (d.dddddE+00) (<100 Hz) (dd.ddddE+00) (<100 Hz) (dd.ddddE+00) (<1000 Hz) (ddd.dddE+00) (<1000 Hz) (ddd.dddE+00) (<10 kHz) (d.dddddE+03) (<10 kHz) (d.dddddE+03) (<100 kHz) (dd.ddddE+03) (<100 kHz)

  • Page 122: 6.7.3 Adc Command Reference

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.3 ADC Command Reference 6.7.3 ADC Command Reference This section describes the ADC command reference of this instrument. “Initial value” shows the status when the *RST command is executed. CAUTION: Ensure the following when using the USB interface.
  • Page 123 Store: OFF memory Store: ON Reply: ST0 or ST1 IRDn, m Readout range setting (0, 0) n, m: 0 to 9999 (7451A/61A) 0 to 19999 (7461P) • Parameters cannot be omitted. IRO? Data reading Reply: See Section 6.7.2, “Output Data Format.”...
  • Page 124 EMISSION (Divergence) TDC? Reply: TDC0 or TDC1 n:50 s to 3600 s (7461A/61P) Sampling interval TRTn (500 ms) n:200 s to 3600 s (7451A) TRT? Reply: TRT+d.ddddddEdd (The position of the decimal point depends on the set- ting.) Trigger delay TRDn...
  • Page 125 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.3 ADC Command Reference Item Command Description Initial value Trigger system Pre-trigger value PTL0 0% (OFF) (LEVEL/DELTA PTL1 trigger) PTL2 PTL3 PTL? Reply: PTLd Complete signal TRCM0 SINGLE output mode TRCM1 MULTI TRCM? Reply: TRCM0 or TRCM1...
  • Page 126 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.3 ADC Command Reference Initial Item Command Description value Measurement Measurement range 7461A/61P condition 2W 4W Freq (AC+DC) (AC+DC) 2W 4W AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO 100  100 ...
  • Page 127 3 1/2-digit display digits 4 1/2-digit display 5 1/2-digit display 6 1/2-digit display (7461A/61P only) Reply : One of RE3 to RE6 (7461A/61P) : One of RE3 to RE5 (7451A) AC filter*2 FAST SLOW Reply: One of FL1 to FL3 Auto-zero ONCE (Auto-zero is set to OFF after executing once.)
  • Page 128 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.3 ADC Command Reference Initial Item Command Description value Calculation NULL calculation Reply: NL0 or NL1 KNLn NULL constant setting n:-9999999.E+6 to +9999999.E+6 (7461A/61P) n:-999999.E+6 to +999999.E+6 (7451A) Setting resolution: 0.000001E-9 Note: The setting is disabled when the NULL calculation is set to OFF.
  • Page 129 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.3 ADC Command Reference Initial Item Command Description value Calculation Scaling calculation Reply: KCd.ddddddEdd (7461A/61P) Reply: KCd.dddddEdd (7451A) dB/dBm calculation dB calculation OFF dB calculation ON dBm calculation ON Reply: One of DB0 to DB2 Constant D n:0.000001E-9 to 9999999.E+6 (7461A/61P)
  • Page 130 SIRDn, m Statistical calculation range setting and performing the calculation (0, -1) calculation n, m: 0 to 9999 (7451A/61A) n, m: 0 to 19999 (7461P) Note: 1. An error occurs if no data exists in the range set by the measurement data memory.
  • Page 131 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.3 ADC Command Reference Initial Item Command Description value Calculation Statistical SAVE? Average value reading calculation Reply: SAVEd.ddddddEdd (7461A/61P) *3 Reply: SAVEd.dddddEdd (7451A) SSIG? Standard deviation value reading Reply: SSIGd.ddddddEdd (7461A/61P) *3 Reply: SSIGd.dddddEdd (7451A) However, if the number of samples is 1 or less: Outputs SSIG+9.999999E+30 (7461A/61P)
  • Page 132 Instrument *IDN? New model name response information ADC Corp.,xxxxx,nnnnnnnnn,mmm *For 7461P, new xxxxx: 7451A, 7461A or 7461P (Product model name) model name nnnnnnnnn: Serial No. response only mmm: Revision No. The new model name response is applied to software revi- sion C00 or later.
  • Page 133 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.3 ADC Command Reference Item Command Description Initial value System Status *CLS Clears each status byte. *STB? Reads the status byte register Reply: ddd *SREn Sets the service request enable register (SRER). n: 0 to 255 (However, bit6 cannot be set.)
  • Page 134 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.3 ADC Command Reference Item Command Description Initial value System Calibration CAL0 Sets the calibration mode to OFF. (Writes the calibration factor when leaving the calibration mode.) CAL1 Sets the calibration mode to ON. CAL?

  • Page 135: Scpi Command Reference

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.4 SCPI Command Reference 6.7.4 SCPI Command Reference 6.7.4.1 SCPI Command Reference Syntax This section describes the syntax to explain each SCPI command. Descriptions of each command include the following items: Function description SCPI command...
  • Page 136 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.4 SCPI Command Reference • [Parameter] Describes a parameter required for sending a command. When the parameter is a numeric type or a character (string) type, it is enclosed in angle brackets (< >). If the parameter is optional, it is enclosed in braces { }.

  • Page 137: Remote Command

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.4 SCPI Command Reference 6.7.4.2 Remote Command Measurement command Function description SCPI command Parameter Query reply Setting the DCV measurement :MEASure? Refer to Section 6.7.2, function and sending the read out “Output Data Format.” request at the same time 1Performing the measurement :MEASure:<Function>?
  • Page 138 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.4 SCPI Command Reference Function description SCPI command Parameter Query reply LP-2W "RESistance:LPOWer" "RES:LPOW" LP-4W "FRESistance: "FRES:LPOW" LPOWer" Continuity "CONTinuity" "CONT" Freq "FREQuency" "FREQ" TEMP *7461P only "TEMPerature" "TEMP" DCV-Bch HI-COM "VOLTage:BDC: "VOLT:BDC:BCOM" BCOM" DCV-Bch HI-LO "VOLTage:BDC:B"...
  • Page 139 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.4 SCPI Command Reference Function description SCPI command Parameter Query reply AC filter setting [:SENSe]:<Function>:FILTer {FAST|MED|SLOW} {FAST|MED|SLOW} The setting is enabled in the ACV, ACV(AC+DC), ACI, and ACI(AC+DC) functions. Auto-zero setting [:SENSe]:ZERO:AUTO {ON,1|OFF,0|ONCE} {1|0} Continuity threshold constant...
  • Page 140 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.4 SCPI Command Reference Calculation function command Function description SCPI Command Parameter Query reply NULL Calculation setting [:SENSe]:<Function>:REFerence:STATe {ON,1|OFF,0} {1|0} NULL constant setting [:SENSe]:<Function>:REFerence [-9999999.E+6|0| <real_6> (7461A/61P) The setting is enabled when 9999999.E+6] <real_5> (7451A)
  • Page 141 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.4 SCPI Command Reference Function description SCPI Command Parameter Query reply Whether to set the calculation :CALCulate:LIMit:PASS:UPPer {ON,1|OFF,0} {1|0} result HI to PASS. Buzzer setting :CALCulate:LIMit:BEEPer {OFF|FAIL|PASS} {OFF|FAIL|PASS} Statistical calculation Calculation range specifying :CALCulate:STATistics [0|0|9999], [0|-1|9999] <int_4>,<int_4>...
  • Page 142 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.4 SCPI Command Reference Trigger system command Function description SCPI Command Parameter Query reply Trigger system starting :INITiate Continuous setting :INITiate:CONTinuous {ON,1|OFF,0} {1|0} Trigger system initialization and :READ? Refer to Section 6.7.2, measurement data reading “Output Data Format.”...
  • Page 143 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.4 SCPI Command Reference System relevant command Function description SCPI Command Parameter Query reply Buzzer Setting :SYSTem:BEEPer:STATe {ON,1|OFF,0} {1|0} Error queue reading :SYSTem:ERRor? <int_3>,<str> SCPI version reading :SYSTem:VERSion? <str> Block delimiter :SYSTem:GPIB:DELimiter:BLOCk {CRLF|LF|EOI} {CRLF|LF|EOI} Power supply frequency...
  • Page 144 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.4 SCPI Command Reference Status command Function description SCPI Command Parameter Query reply Operation Event Enable :STATus:OPERation:ENABle [0|0|65535] <int_5> Register setting Operation Event Register reading :STATus:OPERation:EVENt? <int_5> Questionable Event Enable :STATus:QUEStionable:ENABle [0|0|65535] <int_5> Register setting...

  • Page 145: Status Register Structure

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.5 Status Register Structure 6.7.5 Status Register Structure This instrument has a layered status register structure that is compliant with IEEE standard 488.2-1987 and can send various statuses of this instrument to the controller. This section describes the operation model of status structure and allocation of events.

  • Page 146: Status Register Structure

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.5 Status Register Structure The status register structure in this instrument is shown in Figure 6-4 and Figure 6-5. SRQ transmitting Figure 6-4 Status Register Structure (1/2) 6-46...

  • Page 147: Status Register Structure

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.5 Status Register Structure Figure 6-5 Status Register Structure (2/2) Event enable register Each event register has an enable register that determines which bit is to be enabled. The enable reg- ister sets the corresponding bit in decimal.

  • Page 148: Status Byte Register Structure

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.5 Status Register Structure • Questionable Event Enable Register (QEER): QSE • Operation Event Enable Register (OEER) OSE Status byte register The status byte register summarizes the information from the status register. A summary of this status byte register is sent to the controller as a service request.

  • Page 149: Status Byte Register (Stb)

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.5 Status Register Structure This register responds to the serial polling from the controller. When the register responds to the serial polling, bit0 to bit5, bit7, and the RQS of the status byte register are read, and then the RQS is reset to 0.
  • Page 150 7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.5 Status Register Structure Conditions which clear the status byte register • When the power is turned on. • When the *CLS command is executed. However, the MAV bit is not cleared if data exists in the output buffer.

  • Page 151: Standard Event Status Register (Sesr)

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.5 Status Register Structure Standard event status register Allocation in the standard event register is shown in Table 6-8. Table 6-8 Standard Event Status Register (SESR) Name Description ON: This bit is set to 1 when all operations are complete after receiving the *OPC Operation Complete command.

  • Page 152: Measurement Event Register (Mer)

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.5 Status Register Structure Measurement event register Allocation in the measurement event register is shown in Table 6-9. Table 6-9 Measurement Event Register (MER) Name Description ON: This bit is set to 1 when the comparator calculation result satisfies the FAIL FAIL conditions.

  • Page 153: Questionable Event Register (Qer)

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.5 Status Register Structure Questionable event register Allocation in the questionable event register is shown in Table 6-10. Table 6-10 Questionable Event Register (QER) Name Description Voltage Overload ON: This bit is set to 1 when OL occurs in the voltage or diode measurement.

  • Page 154: Operation Event Register (Oer)

    7451A/7461A/7461P Digital Multimeter Operation Manual 6.7.5 Status Register Structure Operation event register Allocation in the operation event register is shown in Table 6-11. Table 6-11 Operation Event Register (OER) Name Description Not used Always 0 Not used Always 0 Not used...

  • Page 155: Sample Programs (Command Used In Adc Corporation)

    Compatible language: Microsoft Excel Visual Basic for Application NOTE: These samples are programmed assuming that the 7461A is used. If the 7451A is used, change the settings such as a range configuration which depends on the multimeter. Example 1 Measures a voltage in the DCV 10 V range and reads the measurement data from the 7461A.
  • Page 156 7451A/7461A/7461P Digital Multimeter Operation Manual 6.8 Sample Programs (Command used in ADC CORPORATION) Example 2 Sets the measurement function to the 2W measurement, detects the measurement end by using the status byte, and reads the measurement data from the 7461A. The GPIB address of the 7461A is set to 1.
  • Page 157 7451A/7461A/7461P Digital Multimeter Operation Manual 6.8 Sample Programs (Command used in ADC CORPORATION) Call ibconfig(0, IbcAUTOPOLL, 0) ' Disables the automatic serial polling. (Note) Call ibwrt(dmm, "*RST" & Chr(10)) ' Initializes the 7461A. Call ibwrt(dmm, "H0" & Chr(10)) ' Sets the header of the output data to OFF.
  • Page 158 7451A/7461A/7461P Digital Multimeter Operation Manual 6.8 Sample Programs (Command used in ADC CORPORATION) Call ibwrt(dmm, "DS1" & Chr(10)) ' Sets the display to ON. ' Terminates. Call ibonl(dmm, 0) (Note): The GPIB hardware setting is changed. Return to the original setting if other programs may case a failure.

  • Page 159: Sample Programs (Scpi Command)

    Compatible language: Microsoft Excel Visual Basic for Application NOTE: These samples are programmed assuming that the 7461A is used. If the 7451A is used, change the settings such as a range configuration which depends on the multimeter. Example 1 Measures the D.U.T in the DCV 10 V range and reads the measurement data from the 7461A.
  • Page 160 7451A/7461A/7461P Digital Multimeter Operation Manual 6.9 Sample Programs (SCPI command) Example 2 Sets the measurement function to the 2W measurement, detects the measurement end by using the status byte, and reads the measurement data from the 7461A. The GPIB address of the 7461A is set to 1.
  • Page 161 7451A/7461A/7461P Digital Multimeter Operation Manual 6.9 Sample Programs (SCPI command) Example 3 Sets the measurement function to the DCV 10 V range and performs the high-speed measure- ment (Sampling interval: 500 s). In the high-speed measurement, the data is read after the measurements of the specified count are complete.
  • Page 162 7451A/7461A/7461P Digital Multimeter Operation Manual 6.9 Sample Programs (SCPI command) Call ibwrt(dmm, ":DIPLAY ON" & Chr(10)) ' Sets the display to ON. Call ibonl(dmm, 0) ' Terminates. Exit Sub Else Call ibrsp(dmm, s) ' Reads the status byte. End If Call ibwrt(dmm, ":TRACE:DATA?"...

  • Page 163: Specifications

    7451A/7461A/7461P Digital Multimeter Operation Manual 7. SPECIFICATIONS SPECIFICATIONS Specifications Unless otherwise specified, the measurement accuracy of this instrument is guaranteed for one year under the following conditions: Temperature; 23 5C, relative humidity; 85% or less (75% or less in a resistance measurement of larger than 10 M...
  • Page 164 7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.1 DC Voltage Measurement (DCV) Maximum allowable applied voltage Between V and COM 1000 Vpeak Between BchHi and BchLo 200 Vpeak Between BchHi, BchLo and COM 200 Vpeak Between COM and the chassis 500 V...

  • Page 165: Ac Voltage Measurement (Acv, Acv(Ac+Dc))

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.2 AC Voltage Measurement (ACV, ACV(AC+DC)) Maximum allowable applied voltage Between V and COM 1000 Vpeak Between BchHi and BchLo 200 Vpeak Between BchHi, BchLo and COM 200 Vpeak Between COM and the chassis 500 V...
  • Page 166 7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.2 AC Voltage Measurement (ACV, ACV(AC+DC)) ACV(AC+DC) Measurement accuracy *1 (% of reading + digits) 23C5C Input Maximum Input Range Resolution 20 Hz - 45 Hz - 100 Hz - 20 kHz - 50 kHz -...
  • Page 167 7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.2 AC Voltage Measurement (ACV, ACV(AC+DC)) Additional error depending on the integration time AC filter: SLOW Integration time Additional error (digit) 10 s  IT < 200 s In a 3 1/2-digit display 200 s  IT  2 ms Includes FAST1 and FAST2.
  • Page 168 7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.2 AC Voltage Measurement (ACV, ACV(AC+DC)) ACV(AC+DC) Measurement accuracy *1 ( of reading digits) Input Maximum Range Resolution Input impedance 20 Hz - 45 Hz - 100 Hz - 20 kHz - 50 kHz -...

  • Page 169: Resistance Measurement (2W, Lp-2W, 4W, Lp-4W)

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.3 Resistance Measurement (2W, LP-2W, 4W, LP-4W) 7.1.3 Resistance Measurement (2W, LP-2W, 4W, LP-4W) • 7461A/61P 2W and 4W measurements Measurement accuracy *1 Temperature coefficient *4 (% of reading + digits) (ppm of reading + digits)/C...
  • Page 170 7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.3 Resistance Measurement (2W, LP-2W, 4W, LP-4W) Additional error depending on the integration time Additional error (digit + m) Integration time 10 s IT 200 s In a 3 1/2-digit display 2+20 200 s < IT  2 ms Includes FAST1 and FAST2.
  • Page 171 7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.3 Resistance Measurement (2W, LP-2W, 4W, LP-4W) Low Power 2W and 4W measurements (LP-2W/LP-4W) Measurement accuracy *1 Temperature coefficient *5 (% of reading + digits) (ppm of reading + digits)/C Maximum Measurement Range Resolution display...

  • Page 172: Dc Current Measurement (Dci)

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.4 DC Current Measurement (DCI) 7.1.4 DC Current Measurement (DCI) • 7461A/61P Measurement accuracy *1 Temperature coefficient Resistance (% of reading + digits) (ppm of reading + digits)/C Input Maximum between Range Resolution terminal display...

  • Page 173: Ac Current Measurement (Aci, Aci(Ac+Dc))

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.5 AC Current Measurement (ACI, ACI(AC+DC)) Additional error depending on the integration time Integration time Additional error (digit) 100 s  IT < 200 s In a 3 1/2-digit display 200 s  IT  2 ms Includes FAST1 and FAST2.
  • Page 174 7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.5 AC Current Measurement (ACI, ACI(AC+DC)) ACI(AC+DC) Measurement accuracy *1 Resistance (% of reading + digits) 23C5C Input Maximum between Range Resolution terminal display input 20 Hz - 45 Hz - 100 Hz - terminals...
  • Page 175 7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.5 AC Current Measurement (ACI, ACI(AC+DC)) • 7451A Measurement method True RMS measurement, RMS display Input range 5% or more of full scale Crest factor 3:1 at a full scale (Except for the 3 A range) Temperature coefficient (1/10 of measurement accuracy that includes the additional error)/C in each...

  • Page 176: Frequency Measurement (Freq)

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.6 Frequency Measurement (FREQ) Additional error depending on the AC filter Integration time: 10 PLC Additional error (% of reading) Frequency bandwidth Response time *1 20 Hz - 45 Hz 45 Hz - 100Hz 100 Hz - 1 kHz More than 1 kHz...

  • Page 177: Diode Measurement

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.7 Diode Measurement Gate time Maximum display Maximum Measurement Sampling rate Gate time measurement 7461A/ frequency range 7451A period SLOW 1000 ms 1 Hz to 300 kHz 2.2 s 9999999 999999 100 ms 10 Hz to 300 kHz...

  • Page 178: Continuity Measurement

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.8 Continuity Measurement 7.1.8 Continuity Measurement • 7461A/61P Range Maximum display Resolution Measurement current 1000  1199.999 1 m 1 mA Specifications not described above are the same as those in the 1000  range in the 2W measurement.

  • Page 179: Measurement Time And Display Digits

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.10 Measurement Time and Display Digits 7.1.10 Measurement Time and Display Digits Measurement speed (In Auto-range OFF) Integration Bch-DCV Sampling rate Auto-zero 4W ACV(AC+DC) time LP-4W Continuity ACI(AC+DC) 2W Diode LP-2W FAST1 1000 times/s *1...
  • Page 180 7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.10 Measurement Time and Display Digits Integration Time (IT) and Sampling Interval (SI) 7461A/61P 7451A Integration time (IT) Integration time (IT) Setting range Resolution Setting range Resolution 10 s to 199 s 1 s 100 s to 199 s 1 s...

  • Page 181: 7.1.11 Calculation Functions

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.1.11 Calculation Functions 7.1.11 Calculation Functions • NULL calculation Display value (NULL) = Measurement value - NULL constant • Smoothing calculation Display value (SM) = Moving average over a specified number of measurements • Comparator calculation Display (HIGH) ...

  • Page 182: Interface Specifications

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.2 Interface Specifications Interface Specifications Item Specifications Remote control Remote command Compliance with SCPI and the command format for the ADC CORPO- RATION's R6552 and R64 series Interface Either GPIB or USB can be selected.

  • Page 183: General Specifications

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.3 General Specifications General Specifications Item Specifications Operation environment Ambient temperature:0C to +50C Relative humidity: 85%RH or less no condensation 75% or less in resistance measurement of larger than 10 M and low power resistance measurement of larger than 1 M...

  • Page 184: Options

    7451A/7461A/7461P Digital Multimeter Operation Manual 7.4 Options Options Table 7-1 Options Option Description OPT32 Changing the power supply voltage: For 120 V OPT42 Changing the power supply voltage: For 220 V OPT44 Changing the power supply voltage: For 240 V...

  • Page 185: Maintenance

    7451A/7461A/7461P Digital Multimeter Operation Manual 8. MAINTENANCE MAINTENANCE This chapter describes the following information which relates to the maintenance of this instrument. 8.1 Replacing Fuses 8.2 Cleaning 8.3 Calibration 8.4 Replacing Parts with Limited Life 8.5 Product Disposal and Recycle 8.6 Storage...

  • Page 186: Replacing A Power Fuse

    7451A/7461A/7461P Digital Multimeter Operation Manual 8.1.1 Replacing a Power Fuse 8.1.1 Replacing a Power Fuse The power fuse is placed in the AC power supply connector on the rear panel. For more information on how to check and replace the power fuse, refer to Section 3.4.2, “Changing the Power Supply Voltage.”...

  • Page 187: Cleaning

    7451A/7461A/7461P Digital Multimeter Operation Manual 8.2 Cleaning Cleaning This section describes the cleaning procedure of this instrument and warning messages. WARNING: To prevent accidents caused by electric shocks, remove all cables from this instrument. Never attempt to remove the cover to clean the inside of this instrument.

  • Page 188: Calibration

    7451A/7461A/7461P Digital Multimeter Operation Manual 8.3 Calibration Calibration To maintain the measurement accuracy of this instrument, perform calibration at least once a year; warranty period. 8.3.1 Preparing for Calibration Power supply Use an AC power supply in a voltage range listed in Table 3-4 and frequency of 50 Hz or 60 Hz.

  • Page 189: Calibration Point

    7451A/7461A/7461P Digital Multimeter Operation Manual 8.3.3 Calibration Point 8.3.3 Calibration Point Perform calibration for each range of each measurement function. For more information on relation- ships between functions and ranges, refer to Table 5-2. First, calibrate the zero point in each range calibration.
  • Page 190 100 k 1000 k Short 1000 k 10 M Short 10 M 100 M Short 100 M Table 8-3 Calibration Point (7451A) (1 of 2) Measurement Range Zero Calibration point1 Calibration point2 Calibration point3 function 300 mV Short +300 mV...
  • Page 191 7451A/7461A/7461P Digital Multimeter Operation Manual 8.3.3 Calibration Point Table 8-3 Calibration Point (7451A) (2 of 2) Measurement Range Zero Calibration point1 Calibration point2 Calibration point3 function 3000 A +3000 A Open 30 mA Open +30 mA 300 mA Open +300 mA...

  • Page 192: Calibration Procedure

    7451A/7461A/7461P Digital Multimeter Operation Manual 8.3.4 Calibration Procedure 8.3.4 Calibration Procedure Perform calibration in following procedure. Set the calibration mode. Short-circuit all input terminals on the rear panel. Select the input terminal on the front panel. Short-circuit the V, COM, HI, and LO terminals and then open the mA termi- nal.
  • Page 193 7451A/7461A/7461P Digital Multimeter Operation Manual 8.3.4 Calibration Procedure Set a range to be calibrated. Pressing the HOLD key displays the measurement value as a setting value. 10. Adjust the setting value to the calibration value by using the keys. EXIT...
  • Page 194 7451A/7461A/7461P Digital Multimeter Operation Manual 8.3.4 Calibration Procedure 22. Press the ENTER key to start the calibration. 23. Return to step 21 after displaying “PASS” or “FAIL” If “PASS” is displayed, press the EXIT key to exit. If “FAIL” is displayed, restart the calibration after checking that all input termi- nals on the rear panel are short-circuited.

  • Page 195: Replacing Parts With Limited Life

    7451A/7461A/7461P Digital Multimeter Operation Manual 8.4 Replacing Parts with Limited Life Replacing Parts with Limited Life Parts with limited life used in this instrument are listed in the following table. Contact an ADC CORPORATION sales representative to replace any parts, referring to the limited lives listed in the following table.

  • Page 196: Product Disposal And Recycle

    7451A/7461A/7461P Digital Multimeter Operation Manual 8.5 Product Disposal and Recycle Product Disposal and Recycle This product should be disposed of according to the regulations and laws that are established by your country and municipality. When treating this product, separately collect components according to this section to prevent the spread of substances, which may be harmful to humans, and to protect the global environment.
  • Page 197 7451A/7461A/7461P Digital Multimeter Operation Manual 8.5 Product Disposal and Recycle Table 8-5 Disposal (2 of 2) Quantity in Used/ Substance/Component Location Unit Component maximum Not used configuration External electric cables Used Main frame Accessories Power cable Input cable Components containing...

  • Page 198: Storage

    7451A/7461A/7461P Digital Multimeter Operation Manual 8.6 Storage Storage If not using this instrument for a long time, put it in a carton case and store it in an area away from dust and direct sunlight. Storage temperature: -25C to +70C...

  • Page 199: System Recovery Procedure

    7451A/7461A/7461P Digital Multimeter Operation Manual 8.9 System Recovery Procedure System Recovery Procedure Initialization The following shows how to initialize the setting parameters. 6 INIT Select from the mode and press to enter the selection MENU layer. The ‘Param’ parameter is displayed. Press to enter the entry layer.
  • Page 200 7451A/7461A/7461P Digital Multimeter Operation Manual 8.9 System Recovery Procedure Table 8-6 Initial Values of Setting Parameters (1 of 3) Selecting ‘LOAD’ in 5PARAM Selecting When DFLT from Parameter P.OFF from *RST *CLS shipping 6INIT in DFLT USER setting ‘PON.LD’ MENU...
  • Page 201 7451A/7461A/7461P Digital Multimeter Operation Manual 8.9 System Recovery Procedure Table 8-6 Initial Values of Setting Parameters (2 of 3) Selecting ‘LOAD’ in 5PARAM Selecting When DFLT from Parameter P.OFF from *RST *CLS shipping 6INIT in DFLT USER setting ‘PON.LD’ MENU...
  • Page 202 7451A/7461A/7461P Digital Multimeter Operation Manual 8.9 System Recovery Procedure Table 8-6 Initial Values of Setting Parameters (3 of 3) Selecting ‘LOAD’ in 5PARAM Selecting When DFLT from Parameter P.OFF from *RST *CLS shipping 6INIT in DFLT USER setting ‘PON.LD’ MENU...

  • Page 203: 8.10 Self-Test

    7451A/7461A/7461P Digital Multimeter Operation Manual 8.10 Self-Test 8.10 Self-Test 8.10.1 Self-Test The self-test can be performed from the panel operations or by executing the remote command. The self-test is performed by selecting ‘TEST’ from or executing the *TST? 9 SYS MENU remote command.
  • Page 204 7451A/7461A/7461P Digital Multimeter Operation Manual 8.10.2 Display and Key Tests Operations Display Select ‘P/KEY’ by using P/KEY P/KEY Press ENTER All segments Press ENTER of the display are turned on. The display changes after a few seconds. Push Press a key to be checked.

  • Page 205: 8.11 Error Message List

    7451A/7461A/7461P Digital Multimeter Operation Manual 8.11 Error Message List 8.11 Error Message List This section describes the error number and how to deal with error displayed on this instrument. Error description Error display Solution [ ]: Response to the ERR? command...
  • Page 206 7451A/7461A/7461P Digital Multimeter Operation Manual 8.11 Error Message List Error description Error display Solution [ ]: Response to the ERR? command Err208 LV100 zero measurement test error in analog operation No solution [LV 100 Zero Check] Err210 Communication error in Analog...
  • Page 207 7451A/7461A/7461P Digital Multimeter Operation Manual 8.11 Error Message List Error description Error display Solution [ ]: Response to the ERR? command Err-200 Execution error (Command which cannot be executed now) Solution7 [Execution error] Err-213 The INITiate command is ignored because the measurement Solution7 is performing.

  • Page 209: Dimensional Outline Drawing

    DIMENSIONAL OUTLINE DRAWING EXT-1...

  • Page 211: Alphabetical Index

    ALPHABETICAL INDEX ALPHABETICAL INDEX 7451A/7461A/7461P Digital Multimeter Operation Manual ALPHABETICAL INDEX Display Digit Setting ......5-14 Display Mode Setting ......5-14 AC Current Measurement Display Section ........4-2 (ACI, ACI(AC+DC)) ......7-11 AC Voltage Measurement (ACV, ACV(AC+DC)) ......7-3 Accessories ..........3-5 Electromagnetic Interference ....
  • Page 212 7451A/7461A/7461P Digital Multimeter Operation Manual Alphabetical Index Measurement Functions and Parameters 5-9 Response to the *IDN? Command Measurement Range and Auto-Range ..5-11 (7451A/61A Only) ........6-1 Measurement Range Selection Keys ..4-3 Measurement Time and Display Digits .. 7-17 Memory Clear .........

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