Wavetek 1271, 1281 Datasheet

Model1281/1271

Selfcal Digital Multimeters

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Model 1281/1271

2

◆

Configurable for DCV, ACV, DCI, ACI and Ohms measurement

◆

Dual inter-compared ‘Selfcal’ references for enhanced confidence levels — stability
better than 3 ppm/year over a ±5°C temperature range

◆

81/2-digit DCV and Ohms, 61/2-digit ACV, 100% over-ranging

◆

10 GΩinput impedance (up to 20 V DC) and 10 nV input sensitivity

◆

Special Ohms functions for ultra-high accuracy resistance measurements

◆

Range-to-range and function-to-function ratio measurements

◆

Simultaneous display of
voltage and frequency

Model 1281 — versatile precision for Standards
Laboratory measurements

◆

Configurable for DCV, ACV, DCI, ACI and Ohms measurement

◆

‘Selfcal’ for stability over a 0°C to 50°C temperature range

◆

Simultaneous display of voltage and frequency — saving the cost
of a separate frequency counter

◆

High-speed AC measurements — 61/2digit readings at
20 readings/second

◆

Special Ohms functions for high accuracy in-circuit measurements

◆

Comprehensive IEEE 488.2 interface

Model 1271 — speed and accuracy
for Bench and ATE systems

3

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Stable enough to replace standard cells.
Much easier to use.

8

1

/2-digit scale length with usable last-

digit resolution.

100% over-ranging maintains 10 GΩ
input impedance up to 20 V.

Simultaneous readout of AC voltage/current and
frequency saves the cost of an additional
instrument in ATE systems.

Monitor functions give instant access to
measurement uncertainties and
secondary measurement parameters.

Access secondary functions using
no more than two front-panel
keystrokes, followed if necessary
by simple numeric entry.

Math functions allow direct
display of derived values.

Trade speed for resolution to optimise
performance in every application.

Special Ohms Functions: ‘2/4-Wire Ohms’ eliminates errors due to
lead resistance. ‘True Ohms’ eliminates errors due to thermal emfs.
‘LoI Ohms’ minimises self-heating in PRTs and allows in-circuit
measurements with diode junctions in parallel. ‘Ohms Guard’ allows
in-circuit resistance measurements and guards out leakage paths.

Three separate input channels save the cost
of an external scanner and allow function­to-function ratio measurements.

Comprehensive self-test ensures maximum operability.

Accuracy

Functionality

Ease-of-Use

Model 1281/1271

4

Model 1281 —
Working for Cal
Lab Efficiency

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hile continuously striving to
reduce measurement

uncertainties, calibration
laboratories are also under
commercial pressure to reduce
costs. Calibration equipment needs
to be chosen not only for the
uncertainty levels it can deliver,
but also the range of uses to which
it can be put. For accuracy coupled
with versatility, no other standards
laboratory DMM matches the
superb performance of Wavetek’s
Model 1281.

At the heart of the Model 1281,
two specially conditioned 10-volt
zener references are continuously
inter-compared to minimize drift
rate. Coupled with the DC input
amplifier’s incredibly low 0.25 µV/°C
temperature coefficient, this allows
the Model 1281 to achieve a
10-volt range stability over a 1 year
period and ±5°C temperature range
of 3ppm. That’s as good as many
Weston cells. And because the
Model 1281’s temperature coeffi­cient is far superior to a Weston
cell’s, you don’t have to worry about
precision temperature control.

Add the fact that it offers excep­tional 0.1 ppm (± 2 µV) single-range
linearity from zero to 20 V, and you
realise that the Model 1281 not
only substitutes for Weston cells. It
also doubles up as a highly sensi­tive null detector (with an input

impedance >10 GΩ) and a Kelvin

Varley divider.

The Model 1281 also features
exceptional AC performance, with
1-year uncertainties significantly
below 100 ppm up to 10 kHz on its
1 V to 100 V ranges. Its ‘spot cali­brated frequency’ feature gives you
even greater precision. Coupled
with unique AC/DC transfer capa­bilities, this allows the Model 1281
to replace a conventional thermal
transfer standard.

The Model 1281 also has unique
Ohms measurement features. Its
active ‘Ohms Guard’ terminal lets
you guard out leakage current paths
when measuring very high value
resistors. And its ‘LoI’ mode prevent
excessive self-heating in PRTs. The
Model 1281’s 2-input ratio function
allows you to use it as a high per­formance automated bridge.

When you purchase the Model
1281 you’re not only buying a multi­function DMM. You’re also buying
a multi-purpose instrument that’s

much easier to use than tradi-

tional cal lab equipment. Plus

you’ll benefit from more

than 25 years of Wavetek

experience in leading

edge standards lab
metrology.

The Model 1281
Can Replace:-

◆

Standard ‘Weston’ Cells

◆

Null Detectors and µV Meters

◆

Kelvin Varley Dividers

◆

Thermal Transfer Standards

◆

Resistance Bridges

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Model 1271 —
The Best in
Precision ATE
Performance

T

he Model 1271 is a true systems
multimeter, capable of taking

1000 readings per second,
operating over a wide ambient
temperature range, and making in­circuit measurements. Yet it’s more
than accurate enough to satisfy the
most demanding ATE
requirements.

In addition to superb DC volt­age capabilities, the Model 1271
features AC performance that is
unsurpassed by any other systems
DMM. Above 1kHz, it can take up
to 20 high-accuracy 61/2-digit AC
readings per second. And simulta­neous measurement of the input
signal frequency saves the cost of a
separate frequency counter.

ATE systems often cause prob­lems for high-accuracy DMMs
because of the large temperature
rise that can occur in equipment
racks. Not so for the Model 1271.

Using its Selfcal feature, you can
maintain full measurement accuracy
at temperatures as high as 35°C,
without losing traceability. And you
only need to perform Selfcal every
30 days or when the ambient tem­perature shifts more than 5°C.
Compare that to other precision

systems DMMs that require an
internal cal every 24 hours to main­tain full specification.

The Model 1271 also excels at
in-circuit testing. Its special Ohms
functions allow accurate measure­ment of resistors even when they
are part of complex resistor net­works or when they have diode
junctions in parallel. Its True-Ohms
function eliminates thermal emfs
and similar offset voltages in signal
multiplexers. The availability of
three separate input channels
means that in many applications
you won’t even need to use an
external signal multiplexer.

The Model 1271 is also
built for safety. Two rear-panel
mounted input channels keep
signal cabling safely in the back
of the cabinet, leaving the front­panel terminals free for manual
testing or system debugging.

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The Model 1271 –
True Systems
Capabilities

◆

1000 Fully Formatted 5-1/2Digit
DC Readings/Second into Internal
Memory

◆

20 High-Accuracy AC
Readings/Second above 1 kHz

◆

Extended Volt.Hz Envelope for
High Voltage, High Frequency
Signals

◆

High Accuracy In-Circuit Ohms
Measurements

◆

Fully Traceable Measurement Over a
Wide Operating Temperature Range

Model 1281/1271

6

Model 1281 Uncertainty Specifications

Function Range Frequency Uncertainty Relative to Calibration Standards Typical Temperature

[1] (Hz) ±(ppmR + ppmFS) [2][3][4] Calibration Coefficient

or Mode Uncertainty 13°C - 18°C

24 Hour 1 Year (ppm) 28°C - 33°C

23°C ± 1°C 23°C ± 1°C after Selfcal [5]

or 23°C ± 5°C after Selfcal [5] (ppm/°C)

DC Voltage

100.000 00mV 1.0 + 0.5 6 + 0.5 6.5 0.3

1.000 000 00V 0.5 + 0.2 3 + 0.2 3.5 0.25

10.000 000 0V 0.5 + 0.1 3 + 0.1 2.5 0.25

100.000 000V 1.0 + 0.2 6 + 0.2 3.5 0.4

1000.000 00V 1.0 + 0.2 6 + 0.2 3.5 0.4

AC Voltage 100.000 0mV 40 - 10k 60 + 20 100 + 20 155 5

[7][8] 10k - 30k 250 + 30 300 + 40 220 10

30k - 100k 400 + 100 700 + 100 430 40

1.000 000V 40 - 100 50 + 10 80 + 10 75 5
to 100 - 2k 30 + 10 60 + 10 35 5

100.000 0V [9] 2k - 10k 50 + 10 80 + 10 35 5
10k - 30k 100 + 20 200 + 20 50 10
30k - 100k 250 + 100 500 + 100 70 40

100k - 300k 0.15% + 0.1% 0.3% + 0.1% 180 40
300k - 1M 1% + 0.5% 1% + 1% 1400 40

1000.000V [9][10] 40 - 10k 50 + 10 80 + 10 75 10
10k - 30k 100 + 20 200 + 20 250 10
30k - 100K 250 + 100 500 + 100 700 40

Spot Frequency AC 100.000 0mV 40 - 10k 40 + 10 100 + 10 155 5
Voltage [11][12] 10k - 30k 60 + 25 150 + 25 220 10

30k - 100k 100 + 100 500 + 100 430 20

1.000 000V 40 - 10k 30 + 5 60 + 5 75 5

to 10k - 30k 50 + 15 150 + 15 50 10

100.000 0V [9] 30k - 100k 100 + 50 400 + 50 70 40

100k - 300k 0.1% + 0.05% 0.2% + 0.05% 180 40
300k - 1M 0.2% + 0.3% 0.5% + 0.3% 1400 40

1000.000V [9][10] 40 - 10k 30 + 5 60 + 5 75 10
10k - 30k 50 + 15 150 + 15 250 10
30k - 100K 100 + 50 400 + 50 700 40

Resistance 10.000 000Ω [14] Normal Mode 10mA 3.0 + 1.0 12 + 1.0 15 0.8

[13] 100.000 000Ω Normal Mode 10mA 1.5 + 0.3 8 + 0.3 7.5 0.5

1.000 000 00kΩ Normal Mode 1mA 1.0 + 0.3 6 + 0.3 6 0.5

10.000 000 0kΩ Normal Mode 100µA 1.0 + 0.3 6 + 0.3 5.5 0.5

100.000 000kΩ Normal Mode 100µA 1.0 + 0.3 6 + 0.3 10 0.8

1.000 000 00MΩ Normal Mode 10µA 2.0 + 0.7 10 + 0.7 20 1.0

10.000 000 0MΩ Normal Mode 1µA 4.0 + 4.0 20 + 4.0 30 1.5

100.000 0MΩ Normal Mode 100nA 30 + 45 200 + 45 140 15

1.000 000GΩ Normal Mode 10nA 300 + 450 0.2% + 0.045% 350 150

10.000 000Ω [14] Lo

I

Mode 10mA 3 + 1 12 + 1 15 0.8

100.000 000Ω Lo

I

Mode 1mA 5 + 1 12 + 1 7.5 0.8

1.000 000 00kΩ Lo

I

Mode 100µA 5 + 1 12 + 1 6 0.8

10.000 000 0kΩ Lo

I

Mode 10µA 5 + 1 15 + 1 5.5 1.0

100.000 000kΩ Lo

I

Mode 1µA 50 + 3 70 + 3 10 2.0

1.000 000 00MΩ Lo

I

Mode 100nA 200 + 10 400 + 10 20 15

DC Current 100.000 0µA 20 + 2 25 + 2 35 8

1.000 000mA 20 + 2 25 + 2 20 8

10.000 00mA 20 + 2 25 + 2 20 8

100.000 0mA 30 + 5 50 + 5 25 8

1.000 000A 100 + 10 150 + 10 40 10

AC Current 100.000µA 10 - 5k 150 + 50 200 + 100 200 15

[7]

1.000 00mA to 10 - 5k 150 + 50 200 + 100 200 15

100.000mA

1.000 00A 10 - 1k 400 + 100 500 + 200 200 15

1k - 5k 0.1% + 0.03% 0.15% + 0.04% 350 15

Model 1281 Model 1271

Resistance

Type True 4-wire with Ohms guard. 2-wire selectable
Max Lead Resistance 100Ω in any or all leads
Protection (all ranges) 250Vrms
Ratio Accuracy ± (Net ChA Accuracy + Net ChB Accuracy)
Settling Time Up to 100kΩ range generally the same as

DC Voltage but depends on external connections

DC Current

Type Multi-slope, multi-cycle A-D converter.
Protection <2A, internally clamped

>2A, rear panel fuse
Ratio Accuracy ±( Net ChA Accuracy + Net ChB Accuracy)
Settling Time As DCV

AC Current

Type True RMS AC coupled.

DC coupled gives √(AC2+ DC2)
Crest Factor 3:1 at Full Range
Protection <2A, internally clamped

>2A, rear panel fuse
Ratio Accuracy ±( Net ChA Accuracy + Net ChB Accuracy)
Settling Time As AC Voltage

Environment

Temperature

Operating 0°C to +50°C

Storage -40°C to +70°C
Relative Humidity
(non condensing)

0°C to 30°C < 95%

30°C to 40°C < 75%

40°C to 50°C < 45%
Warm-up 4 hours to full uncertainty specification

Power

Voltage 100V to 130V or 200V to 260V
Frequency 47Hz to 63Hz
Consumption 37VA

Dimensions

Height 88mm (3.5 inches)
Width 427mm (16.8 inches)
Depth 487mm (19.2 inches)
Weight 13.5kg (30 lbs)

Safety Designed to UL1244, IEC348 and BS4743
EMC (incl. options) CE Marked
Warranty 1 year

Model 1281 Model 1271

DC Voltage

Type Multi-slope, multi-cycle A-D converter
CMRR (1kΩ 140dB at DC
unbalance) >80dB + NMRR at 1 to 60Hz
NMRR

filter out 60dB at 50/60Hz ± 0.09% 60dB at 50/60Hz

filter in 110dB at 50/60Hz 100dB at 50Hz + 12dB/oct
Protection (all ranges) 1kV rms
Input impedance

0.1V to 10V ranges > 10.000MΩ

100V & 1kV ranges 10MΩ ± 0.1%
Max input Current 50pA
Ratio Accuracy ±(Net ChA Accuracy + Net ChB Accuracy)
Settling Time
(to 10ppm step size)

filter out <50ms <500µs

filter in <1s <500ms

AC Voltage

Type True RMS. AC coupled measures AC component

with up to 1000V DC bias on any range.

DC coupled gives √(AC2+DC2)
CMRR (1kΩ >90dB DC to 60Hz
unbalance)
Crest Factor 5:1 at Full Range (10:1 at 25% of range)
Protection (all ranges) 1kV rms
Input Impedance 1MΩ in parallel with 150pF
LF Accuracy
(DC coupled)

DC Add ±(50ppmR + 20ppmFS + 20µV)
1Hz - 10Hz Add ±(20ppmR + 50ppmFS)

10Hz - 40Hz Add ±20ppmR
Ratio Accuracy ±(Net ChA Accuracy + Net ChB Accuracy)
Settling Time
(to 100ppm step size)

1kHz – <30ms (option 10 only)

360Hz – <100ms (option 10 only)

100Hz <0.5s –

40Hz <1.25s <1s

10Hz <5s <5s

1Hz <50s –
Frequency

Range 10Hz to 1MHz, from 5% of range

to limits set by Max Volt.Hertz
Resolution 4.5 digits or 6.5 digits
Accuracy (1 Year,

±(10ppmR + 2 digits) ±(10ppmR+0.5ppmFS+1digit)

13˚C - 33˚C, typical)

Sample Interval

Fast Gate 50ms (4.5 digits, 200Hz to 1MHz)
Normal Gate 1s (6.5 digits, 10Hz to 1MHz)

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7

Model 1271 Uncertainty Specifications

Function Range Frequency Uncertainty Relative to Calibration Standards Typical Temperature

[1] (Hz) ±(ppmR + ppmFS) [2][3][4] Calibration Coefficient

or Mode Uncertainty (ppm/˚C) [6]

24 Hour 1 Year

[6] (ppm)

23˚C ± 1˚C

DC Voltage

100.000 00mV 3 + 1 10 + 1 6.5 0.3

1.000 000 00V 2 + 0.5 8 + 0.5 3.5 0.25

10.000 000 0V 2 + 0.25 7 + 0.25 2.5 0.25

100.000 000V 3 + 0.5 8 + 0.5 3.5 0.4

1000.000 00V 3 + 1 10 + 1 3.5 0.4

AC Voltage 100.000 0mV 40 - 2k 150 + 70 250 + 70 155 10

[7] 2k - 20k 300 + 120 400 + 120 220 20

20k - 100k 800 + 220 0.16% + 0.022% 430 60

1.000 000V 40 - 20k 100 + 50 200 + 50 75 20
to 20k - 100k 400 + 200 0.1% + 0.02% 70 60

100.000 0V 100k- 300k 0.5% + 0.5% 1% + 1% 180 60
300k - 1M 1.5% +1% 2% + 2% 1400 60

1000.000V [9][10] 40 - 2k 150 + 70 250 + 70 75 10

2k - 20k 300 + 120 400 + 120 250 20

20k - 100K 800 + 220 0.16% + 0.022% 700 60

Resistance 10.000 000Ω [14] Normal Mode 10mA 6 + 2 18 + 2 15 4

[13] 100.000 000Ω Normal Mode 10mA 3 + 0.5 10 + 0.5 7.5 2

1.000 000 00kΩ Normal Mode 1mA 3 + 0.5 10 + 0.5 6 2

10.000 000 0kΩ Normal Mode 100µA 3 + 0.5 10 + 0.5 5.5 2

100.000 000kΩ Normal Mode 100µA 3 + 0.5 10 + 0.5 10 2

1.000 000 00MΩ Normal Mode 10µA 6 + 1 15 + 1 20 2

10.000 000 0MΩ Normal Mode 1µA 12 + 5 30 + 5 30 4

100.000 0MΩ Normal Mode 100nA 50 + 50 400 + 50 140 40

1.000 000GΩ Normal Mode 10nA 500 + 500 0.3% + 0.05% 350 300

10.000 000Ω [14] Lo

I

Mode 10mA 6 + 2 18 + 2 15 4

100.000 000Ω Lo

I

Mode 1mA 10 + 2 17 + 2 7.5 4

1.000 000 00kΩ Lo

I

Mode 100µA 10 + 2 17 + 2 6 4

10.000 000 0kΩ Lo

I

Mode 10µA 10 + 2 20 + 2 5.5 4

100.000 000kΩ Lo

I

Mode 1µA 150 + 5 180 + 5 10 5

1.000 000 00MΩ Lo

I

Mode 100nA 400 + 15 600 + 15 20 400

DC Current 100.000 0µA 20 + 2 50 + 2 35 8

1.000 000mA 20 + 2 50 + 2 20 8

10.000 00mA 20 + 2 50 + 2 20 8

100.000 0mA 30 + 5 100 + 5 25 8

1.000 000A 100 + 10 150 + 10 40 10

AC Current 100.000 0µA 10 - 5k 150 + 50 200 + 100 200 15

[7]

1.000 00mA to 10 - 5k 150 + 50 200 + 100 200 15

100.000mA

1.000 00A 10 - 1k 400 + 100 500 + 200 200 15

1k - 5k 0.1% + 0.03% 0.15% + 0.04% 350 15

Notes for 1281 and 1271 Specification Tables :
[1] 100% over-range on all ranges (except 1kV DC & AC).
[2] Combined uncertainties to 95% minimum confidence level for

max resolution in each function, normal read mode.
[3] Assumes 4-hour warm-up period.
[4] FS = 2 x Full Range.
[5] Selfcal required whenever the temperature moves more than

±1°C from the temperature at which the previous Selfcal was

performed.

[6] Valid for 30 days after Selfcal, ±1°C of Selfcal temperature and

within ±15°C (DCV and ACV) or ±5°C (other functions) of

Autocal calibration temperature. Assumes Autocal at 23°C ±5°C.
[7] Valid for signals >1% FS.
[8] Assumes Transfer Mode is active.
[9] Max Volt.Hertz 3 x 10

7

.

[10] >300V add ±0.0024 (R-300)

2

ppmR.

[11] Valid within ±10% of calibrated RMS value and Spot Frequency.
[12] Instrument includes six ‘Spot Frequencies’ per range that are nor-

mally shipped uncalibrated. Contact factory for Spot Frequency

calibration prices.
[13] True Ohms mode available on 10Ω to 100kΩranges.
[14] 10Ω range available only in True Ohms mode.
[15] Calibrated at 23°C. Includes calibration uncertainty.

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8

Read Rate and Additional Uncertainty Specifications

Model 1281 Model 1271

Function Resolution Frequency Read Rate Additional Errors Frequency Read Rate Additional Errors

(Hz) (readings/second) ±(ppmR + ppmFS) (Hz) (readings/second) ±(ppmR + ppmFS)

Normal Fast Normal Fast Normal Fast Normal Fast

DCV, DCI

8 - 1/25 1/6 0 + 0 0 + 0.1 - 1/10 1/6 0 + 0 0 + 0

& Ohms 7 - 1/6 1/2 0 + 0.1 0 + 0.4 - 1/2 3 0 + 0 0 + 0

6 - 2 35 0 + 0.5 0 + 3 - 10 50 0 + 0.5 0 + 3
5 - 35 150 0 + 5 0 + 30 - 50 1000 0 + 5 0 + 30
4 - 35 150 0 + 50 0 + 50 - - - - -

Transfer Off Transfer On Transfer Off Transfer On

ACV & ACI

6 1 1/25 1/50 200 + 20 0 + 0 10 1/5 0 + 0

10 1/2.5 1/5 200 + 20 0 + 0 40 1 0 + 0
40 1 1/2 200 + 20 0 + 0 360 8 0 + 0

100 3 1 200 + 20 0 + 0 1k 20 0 + 0

5 1 1/25 1/50 200 + 20 0 + 5 10 1/5 0 + 0

10 1/2.5 1/5 200 + 20 0 + 5 40 1 0 + 0
40 1 1/2 200 + 20 0 + 5 360 8 0 + 0

100 4 2 200 + 20 0 + 5 1k 20 0 + 0

4 1 1/25 1/50 200 + 20 0 + 50 - - -

10 1/2.5 1/5 200 + 20 0 + 50 - - ­40 1 1/2 200 + 20 0 + 50 - - -

100 4 2 200 + 20 0 + 50 - - -

Ordering Information
Model 1281

Model 1281 8-1/2 Digit Selfcal Digital Multimeter

(includes DCV, Ratio, Rear Inputs and IEEE-488.2 Interface)
Option 10 True RMS AC Converter
Option 20 2 wire and 4 wire Resistance Converter
Option 30* Current Converter (only available with Option 20)
Option 50 10A Shunt
Option 70 Isolated Analog Output
Option 80 115V, 60Hz Line Operation
Option 90 Rack Mounting Kit

*

Requires Option 10 for AC Current Measurements

Model 1271

Model 1271 8-1/2 digit Selfcal Digital Multimeter

( Includes DCV, Rear Input and IEEE-488.2 Interface )
Option 10 True RMS High Speed AC Converter
Option 20 2 wire and 4 wire Resistance Converter
Option 30* Current Converter (only available with Option 20)
Option 40 Comprehensive Ratio
Option 50 10A Shunt
Option 70 Isolated Analog Output
Option 80 115V, 60Hz Line Operation
Option 81 115V, 50Hz Line Operation
Option 90 Rack Mounting Kit

Model 4953 Current Shunt Uncertainty Specifications

Function Range Frequency Resistance Power Rating Accuracy

(Hz) (Ohms) (Watts) (%)

[15]

DC Current 11A max. - 0.01 1.2 0.009
AC Current 11A max. 40 0.01 1.2 0.05

300 0.01 1.2 0.05

1k 0.01 1.2 0.05

10k 0.01 1.2 0.12

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Model 1281/1271

9

Worldwide Sales Offices

Austria

Wavetek Gesellschaft m.b.H.
Pharos Haus
Nordbahnstrasse 36/TOP 1.4 Tel: [phone]
A-1020 Vienna, Austria Fax: [phone]

China

Wavetek Corporation
Room 2701, Citic Building
No. 19 Jianguomenwai Dajie Tel: [phone]
Beijing 100004, P. R. China Fax: [phone]

France

Wavetek S. A.
Immeuble Le Seine St-Germain
hall B, 12 boulevard des Iles, Tel: [phone]
92130 Issy-les-Moulineaux, France Fax: [phone]

Germany

Wavetek GmbH
Gutenbergstrasse 2-4
85737 Ismaning Tel: [phone]
Germany Fax: [phone]

Hong Kong

Wavetek Hong Kong Ltd.
3A HKPC Building
78 Tat Chee Avenue Tel: [phone]
Kowloon, Hong Kong Fax: [phone]

Japan

Yokogawa Electric Corporation
Product Marketing Department
Measuring Instruments Division
155 Takamuro-cho, Kofu-shi Tel: [phone]
Yamanashi-ken, 400 Japan Fax: [phone]

Singapore

Wavetek Asia-Pacific Pte Ltd
51 Goldhill Plaza
#14-04/05 Tel: [phone]
Singapore 308900 Fax: [phone]

United Kingdom

Wavetek Ltd
Hurricane Way Tel: [phone]
Norwich, Norfolk NR6 6JB, U.K. Fax: [phone]

United States

Wavetek Corporation
9045 Balboa Avenue Tel: [phone]
San Diego, CA 92123, U.S.A. Fax: [phone]

Internet

Worldwide Web
http://www.wavetek.com

WAVETEK is a registered trademark of Wavetek Corporation
Muirhead Wheatstone Bridge photographed on front cover courtesy of Metron Designs Ltd.

Specifications may be subject to change without notice
© Wavetek Corporation 1997

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®