Agilent Technologies 34970A Specifications download pdf

This document lists specifications for

the Agilent Technologies 34970A Data

Acquisition/Switch Unit and its mod-

ules. The explanations and examples

below are helpful in understanding

how to interpret these specifications:

• Measurement accuracy is specified

as percent of reading plus percent

of range, where reading is the actu-

al measured value and range is the

name of the scale (1V, 10V, etc)—not

the full scale value (1.2V, 12V, etc.).

• DMM measurement accuracies

include all switching errors.

Switching errors are also listed sep-

arately in the module specifications

section. Temperature measurement

accuracies include ITS-90 conver-

sion errors. The thermocouple accu-

racies include the reference junc-

tion error as well.

• Accuracies are listed as either

24-hour, 90-day, or 1-year specifica-

tions. This refers to the length of

time since the instrument’s last cal-

ibration. Use the specification that

matches your calibration cycle. The

24-hour specifications are useful for

determining short-term relative

performance.

EXAMPLE 1: Basic dcV accuracy

Calculate the accuracy of the

following measurement:

9 V dc input

10 V dc range

1 year accuracy specifications

Normal operating temperature

(18°C - 28°C)

From the following page, the 1-year

accuracy is

0.0035% of reading + 0.0005%

of range,

which translates into

(0.0035/100 x 9 V) +

(0.0005/100 x 10 V) = 365µV,

for a total accuracy of

365 µV / 9 V = 0.0041%.

EXAMPLE 2: Extreme operating

temperature

When the 34970A is used outside

of its 18ºC-28ºC temperature range,

there are additional temperature drift

errors to consider. Assume the same

conditions in example 1, but at a 35°C

operating temperature:

The basic accuracy is again

0.0035% of reading + 0.0005% of

range=365 µV.

Now, multiply the 10 V temperature

coefficient from the following page by

the number of degrees outside of oper-

ating range for additional error:

(0.0005% reading + 0.0001%

range)/°C x (35°C - 28°C) =

(0.0005% reading + 0.0001%

range)/°C x 7°C =

0.0035% reading + 0.0007% range =

385 µV.

Total error is then

365 µV + 385 µV = 750 µV or

0.008%.

EXAMPLE 3: Thermocouple

measurement accuracy

Calculating the total thermocouple

reading error is easy with the 34970A—

just add the listed measurement accu-

racy to the accuracy of your transducer.

Switching, conversion, and reference

junction errors are already included in

the measurement specification.

For this example, assume a J-type

thermocouple input reading 150°C.

From the following page, total error is

Thermocouple probe accuracy

+ 1.0 °C.

The probe vendor specifies accuracy

of 1.1°C or 0.4 %, whichever is

greater.

Total error is then

1.0°C + 1.1°C = 2.1°C total,

or 1.4%.

EXAMPLE 4: acV accuracy

The acV function measures the true

RMS value of the input waveform,

regardless of waveshape. Listed

accuracies assume a sinewave input.

To adjust accuracies for non-sinusoids,

use the listed crest factor adder.

For this example, assume a ±1 V

square wave input with 50% duty cycle

and a 1 kHz frequency.

Accuracy for 1 V, 1 kHz sinusoid is

0.06% reading + 0.04% range.

A 50% duty cycle squarewave has a

crest factor of

Peak Value / RMS value =

1 V / 1 V = 1

From Crest Factor table, add

0.05% of reading.

The total accuracy is

0.11% of reading + 0.04% of

range = 1.5 mV or 0.15%.

Agilent 34970A

Data Sheet

1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - Agilent 34970A

This document lists specifications forthe Agilent Technologies 34970A DataAcquisition/Switch Unit and its mod-ules. The explanations and examplesbelow

Page 2 - 2 digits, Slow ac filter

10Digital Input/OuputUse the digital outputs with an exter-nal power supply to control microwaveswitches and attenuators, solenoids,power relays, indi

Page 3 - Measurement Characteristics

34970ADATA ACQUISITION/SWITCH UNIT34970ADATA ACQUISITION/SWITCH UNIT34970ADATA ACQUISITION/SWITCH UNIT11Rack Mounting and DimensionsTo rack mount a si

Page 4 - Software

Ordering InformationMainframe34970 Data Acquisition/Switch UnitIncludes internal 61/2 digit DMM, Operating and Service Manuals, Test report, power cor

Page 5 - Module Specifications

2Accuracy Specifications ±(% of reading + % of range)[1]Includes measurement error, switching error, and transducer conversion errorTemperature Coeffi

Page 6 - Agilent 34901A

3Measurement Characteristics[8]DC VoltageMeasurement Method: Continuously Integrating Multi-slope IIIA-D ConverterA-D Linearity: 0.0002% of reading +

Page 7 - Agilent 34908A

4System CharacteristicsScanning InputsAnalog Agilent 34901A, 34902A, and 34908A multiplexer channelsDigital 34907A digital in and totalizeScan List Sc

Page 8 - Agilent 34904A

5Module SpecificationsThe Agilent 34970A accuracy specifi-cations already include the switchingoffset and reference junction errorsshown below. These

Page 9 - Agilent 34906A 75Ω

6Multiplexer Selection GuideChoose between the broad functional-ity of the 34901A, the high speedscanning of the 34902A, or the single-ended density o

Page 10 - Totalize Input

7Agilent 34902A16-Channel High-Speed Multiplexer• 250 ch/s scanning• Two- and four-wire scanning • Built-in thermocouple referencejunctionThe 34902A e

Page 11 - Rack Mounting and Dimensions

8Agilent 34903A 20-Channel Actuator/ General Purpose Switch• SPDT (Form C) latching relays• 300 V, 1 A actuation and controlThis general-purpose switc

Page 12 - Ordering Information

9Agilent 34905A 50ΩAgilent 34906A 75ΩDual 4-channel RF Multiplexers• 2 GHz bandwidth • BNC to SMB adaptercables includedThe 34905A and 34906A RF multi