VTI EX1000系列高精度电压测量仪器用户手册

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"VTI EX1000系列手册提供了关于精密电压测量和热电偶仪器的详细信息，包括EX1000A/EX1000A-TC、EX1016A、EX1032A、EX1048A和EX10SC等不同型号的设备。这些仪器主要用于精确测量电压和温度，适用于各种高精度应用。手册还涵盖了用户保修信息、安全指南、术语和符号，以及设备的主要特性和功能。" VTI EX1000系列是针对高精度电压测量和热电偶测量的专业仪器，主要型号包括： 1. **EX1000A/EX1000A-TC**：这是一款48通道的精密电压测量仪器，同时也具备热电偶测量功能。 2. **EX1016A**：32通道的精密电压测量仪器，同时具有16通道的精密热电偶测量能力。 3. **EX1032A**：16通道的精密电压测量和32通道的精密热电偶测量结合的设备。 4. **EX1048A**：专为热电偶测量设计，提供48通道的高精度测量。 5. **EX10SC**：16通道的信号调理扩展机箱，用于增强系统扩展能力。手册中强调了以下几个关键特性： - **结合热电偶和模拟输入**：这些设备能够同时处理电压和温度测量，适合复杂的多通道应用。 - **端到端自校准**：每个设备都具有自我校准功能，确保在整个测量链路中的准确性。 - **可扩展性**：设计上支持同步高速、高通道数的扩展，适应大规模测量需求。 - **开放热电偶检测(OTD)**：能够识别并处理热电偶断开或未连接的情况，提高系统的可靠性和安全性。 - **冷结点补偿**：对于热电偶测量，内置的冷结点补偿技术确保了温度读取的精确性，即使在变化的环境条件下。此外，手册还包含了重要的安全信息，如认证、保修条款、限制性权利声明以及符合性的声明。用户必须遵循一般安全指示，理解并遵守警告，以确保操作安全。手册还提供了支持资源，帮助用户更好地理解和使用这些精密仪器。 VTI Instruments Corp.是一家专业制造高精度测量设备的公司，其提供的EX1000系列是工程师和科研人员在电压和温度测量领域的理想工具，特别是在需要大量同步测量数据的场合。

VTI Instruments Corp.

16 EX10xxA Introduction

SECTION 1

INTRODUCTION

OVERVIEW

The EX10xxA family of products provides a total of 48-channels, with an exception of RX10xx

products which has 32-channels, of high-performance thermocouple and/or voltage measurement

in a single instrument. This family includes the EX1000A, EX1000A-TC, EX1016A, EX1032A,

EX1048A and RX1032. The last two digits of the model name indicate the number of

thermocouple channels available on the model. For example, the EX1016A has sixteen

thermocouple channels and thirty-two voltage channels. Its combination of measurement

performance and integrity, configuration flexibility, package density, and network connectivity

make it the most powerful, yet easy-to-use, instrument of its kind. The EX10xxA is a complete,

self-contained temperature measurement system that communicates over Ethernet. Unlike other

data acquisition offerings in its class, the EX10xxA offers a tightly integrated solution that frees

the user from the complexity of marrying terminal blocks, signal conditioning cards, digitizer,

power supply, and chassis together.

RX10xx is the rugged version of the EX10xxA family of products, has 32 Channels and most

importantly provides the user with the flexibility to place this instrument even in extreme

conditions and directly in the test cells because of its rugged build.

The EX10xxA also provides a level of measurement integrity and channel independence that far

exceeds the typical data acquisition system. Absent are caveats about scanning speed, channel

order, and overload effects. In the EX10xxA, channels have no influence on each other, regardless

of scanning speed or channel state. Excellent common mode rejection performance provides

immunity from not only power line interference, but also high frequency noise. Moreover, it aids

in maintaining overall system integrity by offering a high-performance open transducer detection

system.

The EX10xxA provides a high level of configuration flexibility as well. Each channel can be

configured independently with regards to measurement function, hardware filter setting, and limit

values. In addition to measuring all standard thermocouples, the EX10xxA can be programmed

with user-defined thermocouple polynomial equations or be used as a low-noise voltmeter.

Scanning speed is programmable up to a maximum of 1 kSa/s, independent of the number of

channels being scanned. This combination of filtering and scanning speed provides the EX10xxA

with the low noise performance required for sensitive applications as well as the speed necessary

to measure fast, fine-gauge thermocouples.

For highest accuracy and stability, the EX10xxA provides an embedded isothermal input section

that is monitored by up to twelve precision thermistors (depending on model), one for every four

thermocouple channels. Moreover, it features an internal calibration source that can be used to

self-calibrate the unit upon command. This extends the unit‟s high accuracy over a wide ambient

temperature range. Thermocouple accuracy is detailed in Table 2-2.

www.vtiinstruments.com

EX10xxA Introduction 17

The EX10xxA is as easy-to-use as it is powerful. An integrated web page provides a convenient

way to instantly verify communications and instrument functionality, while industry standard VXI

plug & play and IVI drivers provide a familiar application programming interface to reduce

integration and program development time.

FEATURES

Combined Thermocouple and Analog Inputs

Easily combine thermocouple and analog signals on these versatile instruments with sampling

rates up to 1 kSa/s (kilosamples per second) per channel. Each input incorporates an independent

signal conditioning path with software selectable filters for maximum flexibility. Complete

channel independence ensures data integrity regardless of sample speed or input overload

conditions.

End-to-end Self-calibration

Complete end-to-end self-calibration is provided for each signal path on a programmable basis. A

highly accurate calibration source provides reference signals that are applied prior to analog

filtering and gain circuits to compensate for drift, aging, or temperature variations. Self-calibration

is simple and quick, and can be performed as often as desired.

Scalable for Synchronized High-Speed, High-Channel Count

With LXI™ Class A compliant features like a built-in Trigger Bus™ hardware trigger subsystem,

the EX10xxA supports easy integration and synchronization of multiple devices, including

existing VXIbus instrumentation.

Note: LXI Class A compliance for RX1032 is in progress.

Open Thermocouple Detection (OTD)

While the integration of the EX10xxA removes many of the reliability and connectivity problems

typically faced by system designers, they still must contend with the reliability of the sensor

connections. Fortunately, the EX10xxA aids a great deal in that regard as well. Each thermocouple

input channel generates a very small current (±7.5 nA/channel) which drives the input to an open-

circuit state if the transducer is disconnected. Implemented in this way, open transducer detection

is continuous and requires no discrete function call on the part of the user to be activated, offering

more protection than systems that only check on command, as a broken sensor can occur at any

time during testing, not just at installation. In a typical application, the OTD has no effect on the

measurement. However, many thermocouple simulators have a much higher impedance than a

thermocouple so an offset may be introduced into the reading when using a simulator. In general,

the OTD should only be active on channels that are being used with actual thermocouples.

The EX10xxA additionally offers a front panel OTD LED for each channel that illuminates upon

the recognition of a fault condition. This provides for quick and easy problem channel

identification. Moreover, to ensure that even intermittent problems are identified, the fault

recognition is a latching mechanism, retaining the information of the current acquisition sequence

until a new acquisition is initiated. Note that voltage channels do not include internal CJC

thermistors, but that each voltage D-sub includes connections for the connection of user-supplied

thermistors.

Cold Junction Compensation (CJC)

For highest accuracy and stability, the EX1000A-TC, EX1016A, EX1032A, EX1048A and

RX1032 provide embedded isothermal input sections that are monitored by twelve precision

thermistors (based on Model#, the number of thermistors can vary), one for every four

thermocouple channels. (Note, the EX1000A may utilize external thermistors as described in the

Voltage Connections section). To ensure that the CJC information is current and time correlated

VTI Instruments Corp.

18 EX10xxA Introduction

with the input channels, the CJC channels are measured with every scan, providing a maximum

time separation of less than 4 ms between the measurement of an input channel and its associated

CJC measurement. For those users that prefer to employ an external cold junction, the EX10xxA

also allows for the programming input of up to forty-eight unique external cold junction

temperatures, one for every input channel. Moreover, the use of internal and external CJC inputs

can be mixed throughout the unit on a per channel basis.

Simplified Installation, Setup and Control

Full LXI Class A compliance makes the EX10xxA of instruments ideal for distributed

measurements throughout a facility – reducing cabling and installation expense. Connect directly

to an Ethernet network using industry standard Ethernet cable and connections. Experience how

plug&play capability simplifies installation and setup.

An onboard, web-accessible user interface allows you to instantly verify communications and

instrument functionality, while IVI and VXI plug&play drivers provide a familiar application

programming interface to further reduce integration and program development time. For

comprehensive, programming-free data recording setup, management and viewing, use EX10xxA

instruments with one of VTI‟s full-featured, turnkey software solutions: EXLab or VTICODA.

Channel Independence

Each of the EX10xxA‟s 48 differential input channels is an independent signal conditioning path,

complete with amplification, programmable hardware filtering, and continuous open transducer

detection. This independence frees the user from the problem of channel-to-channel crosstalk that

is pervasive in most multi-channel data acquisition systems. In the EX10xxA, channels have no

influence on each other, regardless of scanning speed or channel state. Specifically, open or

significantly overloaded channels do not affect the measurement results of any other channels.

Measurement Range

The measurement range of the EX10xxA in terms of temperature is a function of its input voltage

range and the capabilities of the thermocouple sensors themselves. Specifically, the measurement

range of the EX10xxA for the standard thermocouple types is the following:

Type

Min Temp

Max Temp

-200 °C (-328 °F)

1200 °C (2192 °F)

-200 °C (-328 °F)

1372 °C (2502 °F)

-200 °C (-328 °F)

400 °C (752 °F)

-200 °C (-328 °F)

900 °C (1652 °F)

-50 °C (-58 °F)

1768 °C (3214 °F)

-50 °C (-58 °F)

1768 °C (3214 °F)

250 °C (482 °F)

1820 °C (3308 °F)

-200 °C (-328 °F)

1300 °C (2372 °F)

TABLE 2-1: EX10XXA MEASUREMENT RANGE

In terms of voltage, the thermocouple connectors may only accept an input voltage of ±67 mV

when performing temperature conversion. When in voltage mode, these connectors can accept

either ±0.067 V or ±0.1 V inputs. The voltage connectors may use either ±0.01 V, ±0.067 V,

±0.1 V, ±1.0 V, or ±10.0 V inputs for both EU temperature conversion or voltage measurements.

When temperature is selected, the instrument automatically switches the selected channel(s) to the

±67 mV range. The EX1000A-TC is a special case where thermocouple inputs are used for

voltage measurement and may utilize all input ranges available to the voltage connectors.

Table 2-3 provides an overview of each models capabilities.

www.vtiinstruments.com

EX10xxA Introduction 19

For maximum flexibility, each channel can be independently configured with regards to its

thermocouple conversion. Moreover, non-standard thermocouples are accommodated through the

input of user-defined thermocouple polynomial coefficients.

Hardware Filter

Each EX10xxA input channel can be individually configured with one of six low-pass hardware

filters. Five of these filters are 2-pole Bessel filters with frequencies of 4 Hz, 15 Hz, 40 Hz,

100 Hz and 500 Hz. The sixth filter is a single-pole Butterworth filter with a frequency of 1 kHz,

providing a simple anti-alias filter when the 1 kSa/s range is used. These filters allow the

EX10xxA to cover a diverse range of applications, even within the same unit. Suitable for most

applications, the 4 Hz setting provides the lowest noise floor and exceptional common mode

rejection. For higher speed applications, the 1 kHz filter will pass the output from even the fastest

fine-gauge thermocouples with little distortion.

Input Connectors

The EX1016A, EX1032A, and EX1048A employ uncompensated (Cu-Cu) mini-thermocouple

female jacks as an input connector. This connector provides a solid, reliable connection that is also

easily changeable. Since it is not thermocouple-type specific, different thermocouple types can be

mixed throughout the unit without hardware modification. The EX1000A, EX1016A and

EX1032A also employ a standard 50-pin D-sub connector for the voltage input channels. All the

RX10xx channels are individually routed via the screw terminals which is placed just below the

instrument top cover and the cable bunch is brought out through the cable gland.

Sampling Rate

The EX10xxA can be configured for a sampling rate up to a maximum of 1 kSa/s, regardless of

the number of channels included in the scan list. When the requested sampling rate is significantly

less than 1 kSa/s, however, the EX10xxA automatically takes and averages multiple samples. This

offers improved noise performance, while maintaining the requested data output rate.

Digital I/O and Limits

The EX10xxA provides two unique sets of programmable limits that are used for open transducer

detection as well as general purpose input channel monitoring. These limits are programmable on

a per channel basis and are evaluated with each completed scan. The output of limit evaluations is

presented in three forms. The operation of the front panel LEDs is tied to the upper and lower limit

values of one limit set. The operation of the digital I/O port can be optionally linked to any

combination of the upper and lower limit values of either or both limit sets. Finally, the limit

condition information is accessible through the instrument driver.

The EX10xxA features an 8-channel digital I/O port on the rear panel of the instrument, except

RX10xx which has 2-channel digital I/O routed through the 13 pin circular connector (P1). This

port can be used as an arm/trigger source, for presentation of limit evaluation information, and as a

general purpose output device. As a general purpose output device, each DIO channel can be

independently programmed with regards to its output functionality and its static level to assume

when enabled as an output. For expanded and more automated operation, each DIO channel can be

independently linked to one or multiple limit conditions on one or more input channels.

LXI Trigger Bus

The EX10xxA features an 8-channel LXI (LAN eXtensions for Instrumentation) trigger bus on the

rear panel of the instrument. This differential-pair LVDS (Low Voltage Differential Signal) bus

consists of two identical ports connected in parallel. The primary use of the trigger bus is the

transmission of high-speed signals for multiple-unit triggering and synchronization.

Note: RX1032 doesn’t have LXI trigger bus

VTI Instruments Corp.

20 EX10xxA Introduction

Triggering

The EX10xxA supports a full function trigger model with a separate arm source and trigger source

event structure. Trigger and arm source events can be independently programmed from a variety

of sources including Immediate, Timer, Digital I/O, LAN events, the LXI Trigger Bus, and the

LXI alarm.

EX10XXA SPECIFICATIONS

GENERAL SPECIFICATIONS

NUMBER OF CHANNELS

EX10XXA

RX10XX

48 differential inputs

32 differential inputs

CHANNEL TYPES

Thermocouple and voltage

J, K, T, E, S, R, B, N (EX1000A-TC, EX1016A, EX1032A, EX1048A, RX1032)

mV, V (EX1000A, EX1000A-TC, EX1016A, EX1032A)

SAMPLING RATE

1000 Sa/s per channel maximum

TEMPERATURE RESOLUTION

0.1 °C

TEMPERATURE ACCURACY

See Table 2-2 below

TEMPERATURE NOISE

Peak-to-peak

0.08 °C typical (J, K, T, E)

PROGRAMMABLE FILTERS

Bessel (2 pole)

Butterworth (1 pole)

4 Hz, 15 Hz, 40 Hz, 100 Hz, and 500 Hz (-3 dB cutoff frequency)

1000 Hz (-3 dB cutoff frequency)

VOLTAGE INPUT RANGE

Voltage input channels

Thermocouple input channels

±0.01 V, ±0.067 V, ±0.1 V, ±1.0 V, ±10.0 V

±0.067 V for temperature measurement, ±0.067 V and ±0.1 V for voltage measurement.

INPUT POWER

Input voltage/frequency

Power

90 V ac – 264 V ac*, 50 Hz/60 Hz (nominal ac)

47 VA

*Note, fluctuations for mains voltage to the power supply not exceeding 10% of the nominal voltage.

VOLTAGE RESOLUTION

±10.0 V

±1.0

±0.1 V

±0.067 V

±0.01 V

300 µV

30 µV

3.0 µV

2.0 µV

0.3 µV

VOLTAGE ACCURACY

± ( % of reading + offset )

±10.0 V

±1.0 V

±0.1 V

±0.067 V

±0.01 V

± (0.025% + 500 µV) with self-cal, ± (0.05% + 1 mV) without self-cal

± (0.025% + 50 µV) with self-cal, ± (0.05% + 100 µV) without self-cal

± (0.025% + 10 µV) with self-cal, ± (0.05% + 20 µV) without self-cal

± (0.050% + 10 µV) with self-cal, ± (0.10% + 20 µV) without self-cal

VOLTAGE OFFSET STABILITY

±10.0 V

±1.0 V

±0.1 V

±0.067 V

±0.01 V

± 20 µV/°C typical

± 10 µV/°C typical

± 5 µV/°C typical

± 2 µV/°C typical

VOLTAGE GAIN STABILITY

Voltage input channels (all ranges)

and thermocouple input channels

± 25 ppm/°C without self-cal (typical)

± 5 ppm/°C with self-cal at any operating temperature (typical)

INPUT IMPEDANCE

40 MΩ differential

INPUT BIAS CURRENT

5 nA typical

COMMON MODE INPUT RANGE

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