Agilent 34970A Data Sheet

This document lists specifications for
the Agilent Technologies 34970A Data
Acquisition/Switch Unit and its mod­ules. 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 actu­al 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 sep­arately in the module specifications
section. Temperature measurement
accuracies include ITS-90 conver­sion errors. The thermocouple accu­racies include the reference junc­tion error as well.

• Accuracies are listed as either
24-hour, 90-day, or 1-year specifica­tions. This refers to the length of
time since the instrument’s last cal­ibration. 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) = 365µ V,

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 oper­ating 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 accu­racy 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

2

Accuracy Specifications ±(% of reading + % of range)

[1]

Includes measurement error, switching error, and transducer conversion error

Temperature
Coefficient

Frequency, 24 Hour

[2]

90 Day 1 Year 0°C – 18°C

Range

[3]

etc. 23°C ± 1°C 23°C ± 5°C 23°C ± 5°C 28°C – 55°C

dc Voltage 100.0000 mV 0.0030 + 0.0035 0.0040 + 0.0040 0.0050 + 0.0040 0.0005 + 0.0005

1.000000 V 0.0020 + 0.0006 0.0030 + 0.0007 0.0040 + 0.0007 0.0005 + 0.0001

10.00000 V 0.0015 + 0.0004 0.0020 + 0.0005 0.0035 + 0.0005 0.0005 + 0.0001

100.0000 V 0.0020 + 0.0006 0.0035 + 0.0006 0.0045 + 0.0006 0.0005 + 0.0001

300.000 V 0.0020 + 0.0020 0.0035 + 0.0030 0.0045 + 0.0030 0.0005 + 0.0003

True rms 100.0000 mV 3 Hz - 5 Hz 1.00 + 0.03 1.00 + 0.04 1.00 + 0.04 0.100 + 0.004
ac Voltage

[4]

to 100.0000V 5 Hz - 10 Hz 0.35 + 0.03 0.35 + 0.04 0.35 + 0.04 0.035 + 0.004

10 Hz - 20 kHz 0.04 + 0.03 0.05 + 0.04 0.06 + 0.04 0.005 + 0.004

20 kHz - 50 kHz 0.10 + 0.05 0.11 + 0.05 0.12 + 0.05 0.011 + 0.005
50 kHz - 100 kHz 0.55 + 0.08 0.60 + 0.08 0.60 + 0.08 0.060 + 0.008
100 kHz - 300 kHz

[5]

4.00 + 0.50 4.00 + 0.50 4.00 + 0.50 0.20 + 0.02

300.0000V 3 Hz - 5 Hz 1.00 + 0.05 1.00 + 0.08 1.00 + 0.08 0.100 + 0.008
5 Hz - 10 Hz 0.35 + 0.05 0.35 + 0.08 0.35 + 0.08 0.035 + 0.008

10 Hz - 20 kHz 0.04 + 0.05 0.05 + 0.08 0.06 + 0.08 0.005 + 0.008

20 kHz - 50 kHz 0.10 + 0.10 0.11 + 0.12 0.12 + 0.12 0.011 + 0.012
50 kHz - 100 kHz 0.55 + 0.20 0.60 + 0.20 0.60 + 0.20 0.060 + 0.020
100 kHz - 300 kHz

[5]

4.00 + 1.25 4.00 + 1.25 4.00 + 1.25 0.20 + 0.05

Resistance

[6]

100.0000Ω 1 mA current source 0.0030 + 0.0035 0.008 + 0.004 0.010 + 0.004 0.0006 + 0.0005

1.000000 kΩ 1 mA 0.0020 + 0.0006 0.008 + 0.001 0.010 + 0.001 0.0006 + 0.0001

10.00000 kΩ 100 µA 0.0020 + 0.0005 0.008 + 0.001 0.010 + 0.001 0.0006 + 0.0001

100.0000 kΩ 10 µA 0.0020 + 0.0005 0.008 + 0.001 0.010 + 0.001 0.0006 + 0.0001

1.000000 MΩ 5.0 µA 0.002 + 0.001 0.008 + 0.001 0.010 + 0.001 0.0010 + 0.0002

10.00000 MΩ 500 nA 0.015 + 0.001 0.020 + 0.001 0.040 + 0.001 0.0030 + 0.0004

100.0000 MΩ 500 nA/10 MΩ 0.300 + 0.010 0.800 + 0.010 0.800 + 0.010 0.1500 + 0.0002

Frequency 100 mV 3 Hz - 5 Hz 0.10 0.10 0.10 0.005
or Period

[7]

to 5 Hz - 10 Hz 0.05 0.05 0.05 0.005

300 V 10 Hz - 40 Hz 0.03 0.03 0.03 0.001

40 Hz - 300 kHz 0.006 0.01 0.01 0.001

dc Current 10.00000 mA <0.1 V burden 0.005 + 0.010 0.030 + 0.020 0.050 + 0.020 0.002+ 0.0020

(34901A only) 100.0000 mA <0.6V 0.010 + 0.004 0.030 + 0.005 0.050 + 0.005 0.002 + 0.0005

1.000000 A <2 V 0.050 + 0.006 0.080 + 0.010 0.100 + 0.010 0.005 + 0.0010

True rms 10.00000 mA 3 Hz - 5 Hz 1.00 + 0.04 1.00 + 0.04 1.00 + 0.04 0.100 + 0.006
ac Current and

[4]

5 Hz - 10 Hz 0.30 + 0.04 0.30 + 0.04 0.30 + 0.04 0.035 + 0.006

(34901A only) 1.000000 A 10 Hz - 5 kHz 0.10 + 0.04 0.10 + 0.04 0.10 + 0.04 0.015 + 0.006

100.0000 mA

[8]

3 Hz - 5 Hz 1.00 + 0.5 1.00 + 0.5 1.00 + 0.5 0.100 + 0.06
5 Hz - 10 Hz 0.30 + 0.5 0.30 + 0.5 0.30 + 0.5 0.035 + 0.06
10 Hz - 5 kHz 0.10 + 0.5 0.10 + 0.5 0.10 + 0.5 0.015 + 0.06

Temperature Coefficient

Temperature Type 1-Year Accuracy

[9]

Extended Range 1-Year Accuracy

[9]

0°C – 18°C, 28°C – 55°C

Thermocouple B -1100°C to 1820°C 1.2°C -400°C to 1100°C 1.8°C

E -150°C to 1000°C 1.0°C -200°C to -150°C 1.5°C

J -150°C to 1200°C 1.0°C -210°C to -150°C 1.2°C

K -100°C to 1200°C 1.0°C -200°C to -100°C 1.5°C 0.03 °C
N -100°C to 1300°C 1.0°C -200°C to -100°C 1.5°C
R -300°C to 1760°C 1.2°C -50°C to 300°C 1.8°C
S -400°C to 1760°C 1.2°C -50°C to 400°C 1.8°C
T -100°C to 400°C 1.0°C -200°C to -100°C 1.5°C

RTD R

0

from 49 Ω to 2.1 kΩ -200°C to 600°C 0.06°C 0.003°C

Thermistor 2.2 k, 5k, 10k -80°C to 150°C 0.08°C 0.002°C

[1] Specifications are for 1 hr warm-up and 61/2 digits, Slow ac filter
[2] Relative to calibration standards
[3] 20% over range on all ranges except 300 Vdc and ac ranges and 1 Adc and ac cur-

rent ranges

[4] For sinewave input > 5% of range. For inputs from 1% to 5% of range and < 50 kHz,

add 0.1% of range additional error

[5] Typically 30% of reading error at 1 MHz, limited to 1 x 10

8

V Hz

[6] Specifications are for 4- wire ohms function or 2-wire ohms using Scaling to remove

the offset. Without scaling, add 1 Ω additional error in 2-wire Ohms function

[7] Input > 100 mV. For 10 mV inputs multipy % of reading error x 10
[8] Specified only for inputs >10 mA
[9] For total measurement accuracy, add temperature probe error

3

Measurement Characteristics

[8]

DC Voltage

Measurement Method: Continuously Integrating Multi-slope

IIIA-D Converter
A-D Linearity: 0.0002% of reading + 0.0001 % of range
Input Resistance:

100 mV, 1 V, 10 V ranges Selectable 10 MΩ or > 10,000 MΩ
100V, 300V ranges 10 MΩ ±1%

Input Bias Current: < 30 pA at 25°C
Input Protection: 300 V all ranges

True RMS AC Voltage

Measurement Method: AC coupled True RMS — measures the

AC component of the input with up to

300 Vdc of bias on any range
Crest Factor: Maximum of 5:1 at Full Scale
Additional Crest Factor
Errors (non-sinewave): Crest Factor 1-2 0.05 % of reading

Crest Factor 2-3 0.15 % of reading

Crest Factor 3-4 0.30 % of reading

Crest Factor 4-5 0.40 % of reading
Input Impedance: 1 MΩ ± 2% in parallel with 150 pF
Input Protection: 300 Vrms all ranges

Resistance

Measurement Method: Selectable 4-wire or 2-wire Ohms

Current source referenced to LO input
Offset Compensation: Selectable on 100Ω, 1kΩ, 10kΩranges
Maximum Lead Resistance: 10% of range per lead for 100 Ω and

1 kΩ ranges. 1 kΩ on all other ranges
Input Protection: 300 V on all ranges

Frequency and Period

Measurement Method: Reciprocal counting technique
Voltage Ranges: Same as AC Voltage function
Gate Time: 1s, 100 ms, or 10 ms
Measurement Timeout: Selectable 3Hz, 20Hz, 200Hz LF limit

DC Current

Shunt Resistance: 5 Ωfor 10 mA, 100 mA; 0.1 Ωfor 1 A
Input Protection: 1A 250V fuse on the 34901A module

True RMS AC Current

Measurement Method: Direct coupled to the fuse and shunt.

AC coupled True RMS measurement

(measures the ac component only)
Shunt Resistance: 5 Ωfor 10 mA; 0.1 Ωfor 100 mA, 1 A
Input Protection: 1A 250V fuse on the 34901A module

Thermocouple

Conversion: ITS-90 software compensation
Reference Junction Type: Internal, Fixed, or External
Open Thermocouple Check: Selectable per channel. Open >5kΩ

Thermistor 44004, 44007, 44006 series
RTD α = 0.00385 (DIN) and α = 0.00392

Measurement Noise Rejection 60 (50) Hz

[1]

dc CMRR: 140 dB
ac CMRR: 70 dB

Integration Time Normal Mode Rejection

[2]

200 plc / 3.33s (4s) 110 dB

[3]

100 plc / 1.67s (2s) 105 dB

[3]

20 plc / 333 ms (400 ms) 100 dB

[3]

10 plc / 167 ms (200 ms) 95 dB

[3]

2 plc / 33.3 ms (40 ms) 90 dB
1 plc / 16.7 ms (20 ms) 60 dB
< 1 plc 0 dB

Operating Characteristics

[4]

Single Channel Measurement Rates

[5]

Function Resolution

[9]

Reading/s

dcV, 2-wire Resistance 6

1

/2 digits (10 plc) 6 (5)

5

1

/2 digits (1 plc) 57 (47)

4

1

/2 digits (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

acV 6

1

/2 Slow (3 Hz) 0.14

6

1

/2 Med (20 Hz) 1

6

1

/2 Fast (200 Hz) 8

6

1

/2

[6]

100

Frequency, Period 6

1

/2 digits (1s gate) 1

5

1

/2 digits (100 ms) 9

41/2 digits (10 ms) 70

System Speeds

[7]

INTO Memory ch/s

Single Channel dcV 600
34902A Scanning dcV 250
34907A Scanning Digital in 250
34902A Scanning dcV with Scaling & 1 Alarm Fail 220
34907A Scanning Totalize 170
34902A Scanning Temperature 160
34902A Scanning acV

[6]

100
34902A Scanning dcV/Ohms on Alternate Channels 90
34901A/34908A Scanning dcV 60

INTO and OUT of Memory to GPIB or RS-232 (init, fetch)

34902A Scanning dcV 180
34902A Scanning dcV with Timestamp 150

OUT of Memory to GPIB

Readings 800
Readings with Timestamp 450
Readings with All Format Options ON 310

OUT of Memory to RS-232

Readings 600
Readings with Timestamp 320
Readings with All Format Options ON 230

DIRECT to GPIB or RS-232

Single Channel dcV 440
34902A Scanning dcV 200
Single Channel MEAS DCV 10 / MEAS DCV 1 25
Single Channel MEAS DCV/ MEAS OHMS 12

[1] For 1 KΩ unbalance in LO lead
[2] For power line frequency ±0.1%
[3] For power line frequency ±1% use 80 dB or ±3% use 60 dB
[4] Reading speeds for 60 Hz and (50 Hz) operation
[5] For fixed function and range, readings to memory, scaling and alarms off, AZERO

OFF
[6] Maximum limit with default settling delays defeated
[7] Speeds are for 4

1

/2 digits, delay Ø, display off, autozero off. Using 115 kbaud RS-232

setting
[8] Isolation voltage (ch - ch, ch - earth) 300 Vdc, ac rms
[9] 6

1

/2 digits = 22 bits, 51/2 digits = 18 bits, 41/2 digits = 15 bits

4

System Characteristics

Scanning Inputs

Analog Agilent 34901A, 34902A, and 34908A

multiplexer channels
Digital 34907A digital in and totalize
Scan List Scans channels in ascending order

Scan Triggering

Source Interval, external, button press, software,

or on monitor channel alarm
Scan Count 1 to 50,000 or continuous
Scan Interval 0 to 99 hours; 1ms step size
Channel Delay 0 to 60 seconds per channel; 1 ms step size
External Trig Delay <2 ms. With monitor on <200 ms
External Trig Jitter <2 ms

Alarms

Analog Inputs Hi, Lo, or Hi + Lo evaluated each scan
Digital Inputs 34907A digital in: maskable pattern

match or state change

34907A totalize: Hi limit only
Monitor Channel Alarm evaluated each reading
Alarm Outputs 4 TTL compatible

Selectable TTL logic Hi or Lo on fail
Latency 5 ms (typical)

Memory

Battery backed, 4 year typical life

[1]

Readings 50,000 with timestamp

Readable during scan
States 5 instrument states with user label
Alarm Queue Up to 20 events with channel number, read-

ing, and timestamp

System Features

Per-channel Math Individual Mx + B scaling and

Min/Max/Average calculated real time
Power Fail Recovery Resumes scanning automatically
Relay Maintenance Counts each relay closure and stores

on module

User resettable.
Real Time Clock Battery-backed, 4 year typical life

[1]

General Specifications

Power Supply 100V / 120V / 220V / 240V ±10%
Power Line Frequency 45 Hz to 66 Hz automatically sensed
Power Consumption 12 W (25 VA peak)
Operating Environment Full accuracy for 0°C to 55°C

Full accuracy to 80% R.H. at 40°C
Storage Environment -40°C to 70°C

[1]

Weight Net: 3.6 kg (8.0 lbs)
Safety Conforms to CSA, UL-1244, IEC 1010 Cat I
RFI and ESD CISPR 11, IEC 801/2/3/4
Warranty 3 years

Software

HP BenchLink Data Logger (not included with Option 001)

System Requirements

[2]

PC Hardware 486, 66 MHz, 16 MB RAM, 12 MB

disk space

Operating System Windows® 3.1,Windows 95®,

Windows NT 4.0®

Instrument Support Single 34970A operation

Single program window

Computer Interfaces

[3]

GPIB 82335B, 82340A/B/C, 82341A/B/C/D

National Instruments AT-GPIB/TNT,

PCI-GPIB, PC-MCIA
LAN -to- GPIB E2050A (Windows 95 and NT only)
RS-232 (Serial Port) PC COM 1-4

HP BenchLink Features

Configuration Spreadsheet-like setup page

Upload and Download intrument setups

Computed channels using

+ - * / , dB, dBm, dBV, x

2

,

√x

and full, 1/2, or 1/4 bridge strain

Graphical Displays Real-time and historical data displays

Add, delete, size, and configure real time

Strip chart with markers and alarm indica-

tion, X-Y chart with curve fit, Histogram with

statistics, Bar meter, Digital meter, and Data

table

Graphical Controls Sliders, switches, buttons, and LED lights

Alarm / Limit Testing Start / Stop scanning on alarm condition

Control 34903A relay state or 34907A digital

output on alarm

Data Real time streamed (saved) to disk

Copy data or graphics to windows clipboard

Export user-selected data to ASCII file,

CSV, TSV

Event Logging Automatic entry of alarms and errors

Enter user notes real time

Printing Setup spreadsheet, all graphics, and event

log entries

HP BenchLink Performance

[4]

Scan and Save to Disk 100 ch/s 2 strip charts displayed
Readings Saved Maximum 150M/file

Instrument Driver Support for Programming Languages

Universal Compatible with Windows 95 and NT
Instrument Driver

[5]

Agilent VEE 3.2 or greater

Visual Basic 4.0,

LabWindows CVI 4.0,

LabVIEW 4.0
Labview Driver (VI) LabVIEW 4.0

_

[1] Storage at temperatures above 40°C will decrease battery life
[2] Software provided on CD-ROM and includes utility to create floppy disks

for installation
[3] Interface and driver must be purchased and installed separately
[4] 90 MHz Pentium, 20 MB RAM
[5] Requires VISA command library for IEEE-488

Windows, Windows 95, and Windows NT are registered trademarks of Microsoft Corp.
LabVIEW is a registered trademark of National Instruments Corporation.

5

Module Specifications

The Agilent 34970A accuracy specifi­cations already include the switching
offset and reference junction errors
shown below. These errors are listed
separately for determining system
error with external measurement
devices.

Up to three modules, in any combina­tion, can be inserted into a single
mainframe. The 34970A's internal
DMM connections are accessible only
through the 34901A, 34902A, and
34908A low-frequency multiplexers.

On-module screw terminals accept
wire sizes from 16 gage to 22 gage. 20
gage wire is recommended for high
channel count applications. The
34905A and 34906A RF Multiplexers
use SMB connectors. A standard set
of (10) BNC-to-SMB adapter cables is
provided with each RF module for
convenient BNC connections.

Multiplexer Actuator Matrix RF Multiplexer Multifunction

GENERAL 34901A 34902A

[1]

34908A 34903A 34904A 34905A 34906A 34907A

Number of Channels 20 + 2 16 40 20 4 x 8 Dual 1 x 4 See

2/4 wire 2/4 wire 1 wire SPDT 2 wire 50 Ω 75 Ω Page 22

Connects to Internal DMM • • • for module
Scanning Speed 60 ch/s 250 ch/s 60 ch/s specifications
Open/Close Speed 120/s 120/s 70/s 120/s 120/s 60/s

INPUT

Voltage (dc, ac rms)

[2]

300V 300V 300V 300V 300V 42
Current (dc, ac rms) 1A 50mA 1A 1A 1A 0.7A
Power (W, VA) 50W 2W 50W 50W 50W 20W

DC Characteristics

Offset Voltage

[3]

< 3uV < 6uV < 3uV < 3uV < 3uV < 6uV
Initial Closed Channel R

[3]

< 1 Ω < 1 Ω < 1 Ω < 0.2 Ω < 1 Ω < 0.5 Ω
Isolation ch-ch, ch-earth > 10 G Ω > 10 G Ω > 10 G Ω > 10 G Ω > 10 G Ω > 1 G Ω

AC Characteristics

Bandwidth

[4]

10 MHz 10 MHz 10 MHz 10 MHz 10 MHz 2 GHz

[5]

2 GHz

[5]

Insertion Loss (dB) 10 MHz -0.1 -0.1

100 MHz -0.4 -0.4
500 MHz -0.6 -0.5

1 GHz -1 -1

1.5 GHz -1.2 -1.5
2 GHz -3 -2

SWR 10 MHz 1.02 1.02

100 MHz 1.05 1.05
500 MHz 1.20 1.25

1 GHz 1.20 1.40

1.5 GHz 1.30 1.40
2 GHz 1.40 2.00

ch-ch Cross Talk (dB)

[4]

10 MHz -45 -45 -18

[6]

-45 -33 -100 -85
100 MHz -85 -75
500 MHz -65 -65

1 GHz -55 -50

1.5 GHz -45 -40
2 GHz -35 -35

Risetime < 300 ps
Signal Delay < 3 ns
Capacitance HI - LO < 50 pF < 50 pF < 50 pF < 10 pF < 50 pF < 20 pF

LO - Earth < 80 pF < 80 pF < 80 pF < 80 pF < 80 pF —

Volt-Hertz limit 10

8

10

8

10

8

10

8

10

8

10

10

OTHER

T/C Cold Junction Accuracy

[3]

(typical) 0.8°C 0.8°C 0.8°C

Switch Life No Load (typical) 100M 100M 100M 100M 100M 5M 5M

Rated Load (typical)

[7]

100k 100k 100k 100k 100k 100k 100k

Temperature Operating all cards — 0°C to 55°C

Storage all cards — -20°C to 70°C

Humidity (non-condensing) all cards — 40°C / 80% RH

[1] Not recommended for connection to ac line without external transient suppression
[2] Channel-to-channel or channel-to-earth
[3] Errors included in DMM measurement accuracy specifications
[4] 50Ω source, 50Ω load

[5] Bandwidth direct to card SMB connectors
[6] Isolation within channel 1 to 20 or 21 to 40 banks is -40 dB
[7] Applies to resistive loads only

6

Multiplexer Selection Guide

Choose between the broad functional­ity of the 34901A, the high speed
scanning of the 34902A, or the single­ended density of the 34908A. These
three modules are the only way to
connect to the 34970A internal DMM.
They can be used to scan with exter­nal instruments as well.

All multiplexer modules employ
break-before-make scanning, ensuring
only one closed channel (or channel
pair) at a time. Multiple channel clo­sures are allowed on the 34901A and
34902A modules when not configured
for scanning.

The 34908A does not allow multiple
channel closures at any time.

Agilent 34901A

20-Channel
General-Purpose Multiplexer

• 60 ch/s scanning

• Two- and four-wire scanning

• Built-in thermocouple reference
junction

• 300 V switching

The 34901A is the most versatile mul­tiplexer for general purpose scanning.
It combines dense,
multi-function switching with
60 channel/second scan rates to
address a broad spectrum of data
acquisition applications.

Two- and four-wire channels can
be mixed on the same module.
Two additional fused inputs (22 chan­nels total) route up to 1A of current
to the internal DMM, allowing ac and
dc current measurements without the
need for external shunt resistors.

34901A 34902A 34908A

Number of Channels 20 + 2 16 40
Max scan speed 60 ch/s 250 ch/s 60 ch/s
Number of contacts 2 or 4 2 or 4 1

Temperature

Thermocouple •••

2-wire RTD •••
4-wire RTD ••

Thermistor •••
dc Volts •••
ac Volts •••
2-wire Ohms •••
4-wire Ohms ••
Frequency •••
Period •••
dc current •
ac current •

Backplane Switches

H

L

Internal
DMM Input

T

Reference
Junction
Sensor

H

L

Internal
DMM Input
(4W Sense)

I

L

Internal
DMM Input
(Current)

Channel Switches

Bank Switch

Shunt Switches

Fuse

Fuse

H

01

L

H

10

L

H

Com

L

H

Com

L

(4W Sense)

H

11

L

H

20

L

I

21

L

Current
Channels

I

22

L

I

Com

L

(Current)

7

Agilent 34902A

16-Channel
High-Speed Multiplexer

• 250 ch/s scanning

• Two- and four-wire scanning

• Built-in thermocouple reference
junction

The 34902A employs reed relays to
achieve scan rates up to 250 chan­nels-per-second. Use this module for
high-throughput automated test
applications as well as high-speed
data logging and monitoring tasks.

Sixteen two-wire inputs switch up to
300 V. Two- and four-wire channels
may be mixed on the same module.
User provided shunt resistors are
required for current measurements.

Agilent 34908A

40-Channel
Single-Ended Multiplexer

• 60 ch/s scanning

• Single-wire switching for common­low applications

• Built-in thermocouple
reference junction

Use the 34908A for the greatest den­sity in common-low applications,
such as battery test, component char­acterization, and benchtop testing.

Each module switches 40 one-wire
inputs. All two-wire internal meas­urements except current are supported.
The module low connection is isolated
from earth and can float up to 300V.

s

Note: Not recommended for connection to
ac line without external transient suppression.

Note: Thermocouples must be electrically isolat­ed from each other to avoid current loops and
subsequent measurement errors.

Backplane Switches
H
L

Internal
DMM Input

T

Reference
Junction
Sensor

H
L

Internal
DMM Input
(4W Sense)

Channel Switches

Bank Switch

H
L

H
L

H
L

H
L
H
L

H
L

01

08

Com

Com
(4W Sen

09

16

Channel Switches

Backplane

Switch

H
L

Internal
DMM Input

T

Reference
Junction
Sensor

Bank Switch

01

H

20

H

H

Com

L

Com

21

H

H

40

8

Agilent 34903A

20-Channel Actuator/
General Purpose Switch

• SPDT (Form C) latching relays

• 300 V, 1 A actuation and control

This general-purpose switch module
has 20 independent single-pole, dou­ble-throw (SPDT) relays. Use it to
cycle power to products under test,
control indicator and status lights,
and to actuate external power relays
and solenoids. Combine it with
matrix and multiplexer modules to
build custom switch systems. Its
300V, 1A contacts can handle up to
50W, enough for many power line
switching applications.

Agilent 34904A

4x8 Two-wire Matrix Switch

• 32 two-wire crosspoints

• 300V, 1A switching

The 34904A gives you the most f lexi­ble connection path between your
device under test and your test
equipment, allowing different instru­ments to be connected to multiple
points on your DUT at the same time.

Rows or columns may be connected
between multiple modules to build
8x8, 4x16 or larger matrices, with up
to 96 crosspoints in a single frame.

NC

COM

NO

NC

COM

NO

01

20

Col 1

H L

Col 2

H L

Col 8

H L

H

Row 1

L

H

Row 2

L

H

Row 3

L

H

Row 4

L

H

L

H

Channel 31
(Row 3, Column 1)

L

9

Agilent 34905A 50Ω
Agilent 34906A 75Ω

Dual 4-channel RF Multiplexers

• 2 GHz bandwidth

• BNC to SMB adapter
cables included

The 34905A and 34906A RF multi­plexers offer broadband switching
capabilities for high-frequency and
pulsed signals. Use them to route test
signals between your device under
test and your signal generator, oscil­loscope, spectrum analyzer, or other
instrumentation.

The RF multiplexers are arranged as
two independent 1x4 multiplexers,
each with a common shield and a
switched center conductor.
Connections can be made directly to
SMB inputs with 2 GHz usable band­width, or to the BNC-to-SMB

adapters provided with 1 GHz band­width. Multiple banks may be cascad­ed together for applications requiring
even larger topologies—create a stub­less 16:1 multiplexer in a single
frame.

50Ω MUX Typical AC Performance Graphs

Insertion Loss VSWR Crosstalk

75Ω MUX Typical AC Performance Graphs

Insertion Loss VSWR Crosstalk

direct to card
using provided adapter cables

11

12

Com

13

14

21

22

Com

23

24

0 dB

-1 dB

-2 dB

-3 dB

-4 dB

0 dB

-1 dB

-2 dB

-3 dB

-4 dB

10 MHz 100 MHz 1 GHz 3 GHz

10 MHz 100 MHz 1 GHz 3 GHz

1.80

1.60

1.40

1.20

1.00

10 MHz 100 MHz 1 GHz 3 GHz

1.80

1.60

1.40

1.20

1.00

10 MHz 100 MHz 1 GHz 3 GHz

-20 dB

-40 dB

-60 dB

-80 dB

-100 dB

10 MHz 100 MHz 1 GHz 3 GHz

-20 dB

-40 dB

-60 dB

-80 dB

-100 dB

10 MHz 100 MHz 1 GHz 3 GHz

10

Digital Input/Ouput

Use the digital outputs with an exter­nal power supply to control microwave
switches and attenuators, solenoids,
power relays, indicators, and more.
Use the digital inputs to sense limit
switch and digital bus status. There
are no complex handshake modes;
reads and writes are initiated either
from the front panel or the bus.

Digital Input/Output

Port 1, 2 8 bit, input or output, non-

isolated
Vin(L) < 0.8V (TTL)
Vin(H) > 2.0V (TTL)
Vout(L) < 0.8V @ Iout = - 400 mA
Vout(H) > 2.4V @ Iout = 1 mA
Vout(H) max < 42V with external open

drain pull-up
Alarming Maskable pattern match

or state change

Speed 4 ms (max) alarm

sampling

Latency 5 ms (typical) to 34970A

alarm output
Read/Write Speed 95/s

Agilent 34907A

Multifunction Module

• 16 bits of digital input and output

• 100 kHz totalizer input

• Two ±12V analog outputs

The 34907A allows great flexibility
for a variety of sense and control
applications. It combines two 8-bit
ports of digital input and output, a
100 kHz gated totalizer, and two ±12V
analog outputs—all on a single earth­referenced module. The digital inputs
and totalizer input may be included
in a scan. Alarm limits for the digital
and event counter inputs are evaluat­ed continuously, capturing and log­ging alarm conditions even between
scans.

Analog Output

Use the two electronically calibrated
analog outputs to source bias voltages
to your device under test, to control
your analog programmable power
supplies, or use the outputs as set­points for your control systems. The
outputs are programmed directly in
volts, either from the front panel or
from the bus.

Analog Output

DAC 1, 2 ± 12V, non-isolated
Resolution 1 mV
I

OUT

10 mA max

Settling time 1 ms to 0.01% of

output

Accuracy ±(% of output + mV)

1 year ±5°C 0.25% + 20 mV

Temp. Coefficient ± (0.015% + 1 mV)/°C

Totalize Input

Count events from devices like photo
interrupters, limit switches, and
Hall-effect sensors.

It keeps an updated total which can
be read via the front panel or pro­grammatically at any time. With 26
bits of resolution, it can count events
at full speed for nearly 11 minutes
without an overflow.

Totalize Input

Max Count 226- 1
Totalize Input 100 kHz (max)

Rising or falling edge,
programmable

Signal level 1 Vp-p (min)

42 Vpk (max)

Threshold 0V or TTL,

jumper selectable
Gate Input TTL-Hi, TTL-Lo, or none
Count Reset Manual or Read + Reset
Read Speed 85/s9

8

8

28 Bits

16

16

DIO

TOT

DAC 1

DAC 2

Bit 0

Bit 7
Bit 0

Bit 7

+IN

-IN

Gate
Gate

Channel 04

Channel 05

Port 1
Channel 01

Port 2
Channel 02

Channel 03

11

Rack Mounting and Dimensions

To rack mount a single instrument, order adapter kit 5063-9240 (Option 1CM).

To rack mount two instruments side-by-side, order lock-link kit 5061-9694 and flange kit 5063-9212.

To install one or two instruments in a sliding support shelf, order shelf 5063-9255, and slide kit 1494­0015 (for single instrument, also order filler panel 5002-3999).

34970A
DATA ACQUISITION/SWITCH UNIT

34970A
DATA ACQUISITION/SWITCH UNIT

34970A
DATA ACQUISITION/SWITCH UNIT

Ordering Information

Mainframe

34970 Data Acquisition/Switch Unit

Includes internal 61/2 digit DMM, Operating and Service Manuals,
Test report, power cord, and Quick Start package (includes HP Benchlink
Data Logger software, RS-232 Cable, Thermocouple, and screwdriver)
Modules are purchased separately and are required to operate.

Option 001 Delete Internal DMM

Same as above but deletes DMM and quick start package.

Order 34970-80010 to retrofit DMM at a later time.
Option 1CM Rack Mount Kit
Option 0B0 Delete Manual Set

Modules

34901A 20-Channel Armature Multiplexer
34902A 16-Channel Reed Multiplexer
34903A 20-Channel Actuator/General Purpose Switch
34904A 4 x 8 Two-Wire Matrix Switch
34905A Dual 4-Channel RF Multiplexer, 50 Ohms
34906A Dual 4-Channel RF Multiplexer, 75 Ohms
34907A Multifunction Module
34908A 40-Channel Single-Ended Multiplexer

Accessories

34307A 10-pack of J-type thermocouples
34308A 5-pack of 10 kΩthermistors
34161A Accessory Pouch
34131A Hard Carrying Case (Transit Case)
34397A dc-to-ac Inverter
E2050A LAN/GPIB Gateway
34970-80010 DMM Field Installation Kit

Fully calibrated with Test Report and Quick Start Kit
34905-60001 Kit of 10 SMB-to-BNC adapter cables, 50Ω
34906-60001 Kit of 10 SMB-to-BNC adapter cables, 75Ω

Related Literature Pub. Number

Accessories for the Agilent 34970A Data Acquisition/Switch Unit 5966-4443EUS
Practical Temperature Measurements 5965-7822E

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