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Keysight Technologies
Fully-Automatic DMM Calibration System




                                                                             White Paper




     Abstract
     This paper describes a fully-automatic calibration system for digital
     multimeters (DMMs), and uncertainty estimation of the DCV
     measurements of the system. A connection mechanism whose rating
     is more than 1000 V/1 A/1 MHz was developed for the system.
     By using compressed air to drive the mechanism, we were able to
     eliminate operator bias, as well as improve the thermal electromotive
     force and measurement repeatability of the system. For the standard
     in the system, an 8 1/2 digital multimeter was used, which was
     calibrated by the standards laboratory of Keysight Technologies Japan
     Ltd. The measurement uncertainty was estimated by referring to the
     ISO Guide to the Expression of Uncertainty in Measurement[1] (GUM).
Introduction

   Issue for Designing Fully-Automatic DMM Calibration System

   There are some points to be considered in order to design a digital multimeter
   (DMM) calibration system, such as traceability to an upper level standards
   laboratory, selection of a stable standard, and evaluation of the measurement
   repeatability. Furthermore, for a fully -automatic DMM calibration system, it
   is necessary to consider signal switching mechanisms, system noise, and
   countermeasures for abnormal conditions.

   Generally, a relay switch is used to route test signals between the unit under
   test (UUT) and signal sources. However, a relay switch isn't suitable for
   precision measurement of low voltage because thermal electromotive force
   (thermal-emf) is caused by self-heating due to the driving current of the relay.
   Therefore, a commercially available low thermal-emf scanner is widely used
   for a precision measurement system for a standard cell or a Zener voltage
   standard. On the other hand, as maximum DC voltage and DC current of the
   DMM calibration are 1000 V and 1 A, the scanner whose maximum rate is 24
   V 0.5 A is unlikely to be used in the fully-automatic DMM calibration system.

   Besides, a fully-automatic calibration system is physically larger than a
   manual calibration system. Because the cables between the equipment
   become long and are easily affected by environment noise, the problem of
   measurement repeatability can occur.

   Furthermore, as the fully-automatic calibration system can perform calibration
   without operators, it is important to take countermeasures for unexpected
   damage to the equipment or the software into consideration.


   Authors: Yuko Hirota, Tos hiaki Aoki and Masao Noguchi
   Keysight Technologies Japan, Ltd.
   2000 NCSL Workshop & Symposium
Design for Fully-Automatic DMM Calibration System
We developed the fully-automatic system in order to improve upon operation
quality and throughput of 81/2-digit DMM calibration, considering the above-
mentioned problems. The calibration parameters are DCV, DCI, DCR, ACV, ACI
and frequency at 1 MHz. For example, calibration ranges are from 100 mV to
1 kV for DCV and from 100 

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