Chapter 9 Specifications

DC Measurement and Operating Characteristics

DC Measurement and Operating Characteristics

DC Measurement Characteristics [1]

DC Voltage

Continuously Integrating,

Measurement Method:

 

Multi-slope III A/D Converter

A/D Linearity:

0.0002% of reading + 0.0001% of range

Input Resistance:

Selectable 10 MΩ or >10 GΩ

100 mV, 1 V, 10 V ranges

100 V, 300 V ranges

10 MΩ ±1%

Input Bias Current:

< 30 pA at 25 °C

Input Protection:

300 V on all ranges

 

 

Resistance

Selectable 4-wire or 2-wire Ohms,

Measurement Method:

 

Current source reference to LO input

Offset Compensation:

Selectable on 100Ω , 1 kΩ , 10 kΩ ranges

Max. Lead Resistance:

10% of range per lead for 100Ω and

Input Protection:

1 kΩ ranges. 1 kΩ on all other ranges

300 V on all ranges

 

 

DC Current

5Ω for 10 mA, 100 mA; 0.1Ω for 1A.

Shunt Resistance:

Input Protection:

1.5A 250 V fuse on 34901A module

 

 

Thermocouple

ITS-90 software compensation

Conversion:

Reference Junction Type:

Internal, Fixed, or External

Open T/C Check:

Selectable per channel. Open > 5 kΩ

 

 

RTD

α = 0.00385 (DIN/IEC 751) using

 

ITS-90 software compensation or

 

α = 0.00391 using IPTS-68 software

 

compensation.

 

 

Thermistor

44004, 44007, 44006 series

 

Measurement Noise Rejection 60 Hz (50 Hz) [2]

DC CMRR:

140 dB

Integration Time

Normal Mode Rejection [3]

200 PLC / 3.33s (4s)

110 dB [4]

100 PLC / 1.67s (2s)

105 dB [4]

20 PLC / 333 ms (400 ms)

100 dB [4]

10 PLC / 167 ms (200 ms)

95 dB [4]

2 PLC / 33.3 ms (40 ms)

90 dB

1 PLC / 16.7 ms (20 ms)

60 dB

< 1 PLC

0 dB

 

 

DC Operating Characteristics [5]

 

Digits [6]

 

 

Additional

Function

Readings/s

Noise Error

DCV, DCI, and

61⁄2

0.6

(0.5)

0% of range

Resistance:

61⁄2

6

(5)

0% of range

 

51⁄2

60

(50)

0.001% of range

 

51⁄2

300

0.001% of range [7]

 

41⁄2

600

0.01% of range [7]

Single Channel Measurement Rates [8]

Function

Resolution

Readings/s

DCV, 2-Wire Ohms:

61

⁄2 (10 PLC)

6

(5)

 

51

⁄2

(1 PLC)

57

(47)

 

41

⁄2

(0.02 PLC)

600

Thermocouple:

0.1 °C (1 PLC)

57

(47)

 

(0.02 PLC)

220

RTD, Thermistor:

0.01 °C (10 PLC)

6

(5)

 

0.1 °C (1 PLC)

57

(47)

 

1 °C (0.02 PLC)

220

 

 

 

 

 

 

Autozero OFF Operation

Following instrument warm-up at calibration temperature ±1 °C and < 10 minutes, add 0.0002% range additional error + 5 ∝V.

Settling Considerations

Reading settling times are affected by source impedance,

low dielectric absorption characteristics, and input signal changes.

[1]300 Vdc isolation voltage (ch-ch, ch-earth)

[2]For 1 kΩ unbalance in LO lead

[3]For power line frequency ±0.1%

[4]For power line frequency ±1%, use 80 dB. For power line frequency ±3%, use 60 dB.

[5]Reading speeds for 60 Hz and (50 Hz) operation; autozero OFF

[6]61⁄2 digits=22 bits, 51⁄2 digits=18 bits, 41⁄2 digits=15 bits

[7]Add 20 ∝V for DCV, 4 ∝A for DCI, or 20 mΩ for resistance

[8]For fixed function and range, readings to memory, scaling and alarms off, autozero OFF

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Agilent Technologies 34970A manual DC Measurement and Operating Characteristics
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34970A specifications

Agilent Technologies 34970A is a versatile data acquisition and measurement system that has gained popularity in various industries, including research and development, manufacturing, and education. The primary purpose of the 34970A is to offer an efficient solution for data collection, monitoring, and analysis, which can significantly enhance productivity and accuracy in testing applications.

One of the main features of the 34970A is its modular design, allowing users to customize the system according to their specific measurement needs. The mainframe can accommodate up to three plug-in measurement modules, which can include various types of measurements such as analog, digital, temperature, and frequency. This modularity provides flexibility for users to tailor the system to their requirements, making it highly adaptable to different applications.

Another notable characteristic of the Agilent 34970A is its impressive channel configuration. The system can support up to 120 measurement channels when fully configured, enabling extensive data acquisition without the need for multiple devices. This capability is essential for applications requiring simultaneous monitoring of multiple parameters or locations.

The 34970A utilizes advanced signal processing technologies to ensure high-accuracy measurements. The internal 6.5-digit resolution multimeter provides precise readings, while the device also supports various input types, such as thermocouples and RTDs for temperature measurements. The ability to perform mathematical functions, such as summation and averaging, on the acquired data further enhances its usability.

For data storage and management, the Agilent 34970A features built-in memory for storing up to 20,000 readings. Users can also easily transfer data to a PC through the RS-232 interface or GPIB (IEEE 488) for further analysis and reporting. Additionally, it offers the capability to program automatic data logging and scheduling of measurements, which streamlines the testing process and reduces manual intervention.

In terms of user interface, the 34970A is equipped with a large graphical display that provides clear visualization of measurement data and easy navigation through settings and options. The menu-driven interface makes it accessible for users of all skill levels, simplifying the setup and operation of the device.

Overall, the Agilent Technologies 34970A stands out for its modularity, high channel capacity, advanced measurement technologies, and user-friendly interface. As a reliable and efficient data acquisition system, it is well-suited for a wide range of applications, making it an essential tool for engineers and technicians looking to enhance measurement precision and efficiency.
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