Power Meter NRVS
Power, level and voltage measurements from DC to 40 GHz
• Accurate, general-purpose,
easy-to-use
• Intelligent measuring heads:
just plug them in and measure
• DC frequency input for tracking
frequency response correction
•Analog output
• Remote control of all functions
via IEC/IEEE bus
Uncompromizing technology and
ease of operation make the NRVS an
ideal instrument for any kind of power
measurement in manifold laboratory
and system applications. Thanks to its
unique measuring heads with calibration data memory and temperature
sensor, which make adjustments by
the user superfluous, the NRVS measures at all times with high accuracy
and free of operator’s errors.
WF 43 225-3
The range of measuring heads includes thermal power sensors as well as highly sensitive diode power sensors, peak power
sensors, probes and insertion units for voltage measurements. The NRVS covers a power span from 100 pW up to the
kW range. In addition to the power sensors, all voltage probes of the URV5-Z series can be used.
Readout
Measurement results, units and various
items of information are displayed on a
large 41/2-digit LC display in three
steps of resolution.
All standard units of measurement or
relative modes can be selected. A highresolution bargraph indicator with selectable scaling or autoscaling permits
quasi-analog display of measured values with any unit or resolution.
The characters „PEP“ or „PUL“
preceding the numerical value denote the maximum envelope power (measured with a
Peak Power Sensor of the
NRV-Z3x series) or the pulse
power, respectively. The pulse
power is a calculated peak
value for RF bursts with rectangular envelope. It is based on
the duty factor and the average power value. Pulse power measurements can be
made using thermocouple
sensors as well as diode power sensors operated in the
square-law region.
Operation
Operation of the power meter is to a
great extent via selfexplanatory menus
so that the user will hardly ever have to
refer to the manual. For setting the instrument rapidly to a specific status, 20
complete setups can be stored. A selectable write protection prevents inadvertent alteration of stored setup data.
Measurement rate
The attainable measurement rate not
only depends on the type of measuring
head used but also on the setting of the
averaging filter, which must be
matched to the measurement conditions. Taking into account the connected measuring head, the NRVS automatically selects the appropriate measurement rate by determining the optimum
averaging time required for a steady
readout as a function of level and selected resolution. This automatic selection
may be disabled and an averaging
time of between 4 ms and 25 s may be
set manually to measure faster than in
automatic operation or to further reduce the noise.
Measuring heads
Power meters cover a wide range of applications and a great variety of frequency and power ranges. Since suitable measuring heads are available for
the various applications and ranges,
the only factors to influence the selec-
2 Power Meter NRVS
tion of a power meter are versatility,
system compatibility and ease of operation. In these aspects the NRVS is a
top-class unit. NRVS measuring heads
are not type-specific and may therefore
be used with any unit of the R&S power
and voltmeter families.
Thermal power sensors measure the average power irrespective of the signal
shape and meet the highest demands on
accuracy. Diode power sensors are more
sensitive – they are able to measure pow-
er down to the pW range – but their
measurement accuracy is impaired when
high-level, non-sinusoidal signals are to
be measured. In the medium sensitivity
range it is recommended to use diode
power sensors with integrated attenuator, eg NRV-Z2. This combination not
only allows considerably faster level
measurements in the range between 10
and 100 µW than a thermal power sensor, it also offers better matching than a
highly sensitive diode detector and still
measures true rms power.
The maximum envelope power of modulated signals can be measured by
means of a Peak Power Sensor of the
NRV-Z3x series. These sensors are suitable for sync peak power measurements on TV transmitters and transmitter
power measurements on TDMA radio
equipment or for general applications.
Peak Power Sensors, which consist of a
fast diode detector followed by a peakhold circuit, are calibrated individually
like all Rohde&Schwarz power sensors.
Besides the NRV-Z power sensors, all
voltage probes of the URV5-Z series
can be used with the NRVS.
WF 40 103
NRVS in use:
on-site meas-
urement on TV
transmitter
Measurement accuracy
The accuracy of an RF power measurement essentially depends on the characteristics of the power sensor. Errors
encountered in this case are a function
of level, temperature and frequency
and cannot be eliminated completely
by design. Error sources of power sensors:
• Non-linearity
• Level-dependent temperature effect
• Frequency response
To be able to measure correctly under
any conditions, deviations from the ideal must be registered numerically and
considered in the measurement result.
The usual way to obtain accurate results
is to calibrate the sensors with the aid of
a generator prior to their use. The disadvantages of this method are obvious:
a calibration has to be performed before each measurement, for each individual sensor and even at intervals during a measurement (in the case of tem-
perature variations). For this reason,
Rohde&Schwarz has for years been
producing sensors that offer great convenience to the user, although at a higher expenditure to the manufacturer. This
technique can be summarized as: plug
in and go!
All relevant parameters are measured
in the factory individually for each
measuring head and then stored in the
head. The level-dependent temperature
effect is represented as a two-dimensional characteristic with a great
number of measurement points.
Each measuring head comprises a temperature sensor, the signal of which is
evaluated in the power meter at regular
intervals. From the measured temperature and level values, the stored characteristic yields the correction values for
the output voltage of the measuring
head. The input power is then calculated from this corrected voltage with the
aid of a transfer function which is also
stored in the head.
Power Meter NRVS 3
Subsequently, frequency-response correction is carried out. The NRVS multiplies the calculated input power with
the correction factor for the signal frequency. This frequency is either entered
by the user or obtained from a frequency-proportional DC voltage at the DC
FREQ input.
NRVS
Reference plane
This comprehensive error correction
technique offers the following advantages:
• Unrestricted exchange of measuring heads thanks to individual calibration
• Optimum measurement accuracy
• Calibration of measuring heads di-
rectly traceable to PTB standards
• Fast and convenient operation
In spite of all these corrective measures,
one uncertainty remains which is not
caused by the measuring head but by a
possible mismatch of measuring head
and signal source.
As an example, the power applied
from a source to a load with a characteristic impedance Z
(50 or 75 Ω) is to
0
be measured. The output impedance of
the source and the input impedance of
the measuring head, which acts as a
load, deviate from Z
to some extent.
0
This mismatch at both ends causes a
measurement error which is often ignored because it cannot be specified
for the measuring head separately. The
error depends on the degree of mismatch between source and measuring
head. (See diagram on page 7). Since,
generally, the SWR of the source cannot be varied, the measurement accuracy can only be increased by selecting a
low-reflection measuring head. Since
all NRVS power sensors offer excellent
SWR characteristics, no wrong choice
can be made.
Depending on the
measuring head used,
attenuations of up to
90 dB can be measured
with the NRVS.
This setup is used for
measuring and
recording the powertrans-
fer characteristic
of a DUT.
Thanks to their wide dynamic range, the NRVS
power sensors are ideal
for measuring small
reflection coefficients,
eg by using SWR Bridge
ZRB2.
Source
G
Sawtooth
output
Sweep
generator
RF output
DUT
Source
G
G
NRVS
DUT
XY recorder
NRVS
SWR bridge
(eg R&S ZRB2)
Power
sensor
FREQ(DC)
X Y
Power
sensor
Power
sensor
LEV(DC)
DUT
4 Power Meter NRVS
Power sensors
WF 43 230
WF 39 823
WF 39 821
NRV-Z1
828.3018.02
NRV-Z2
828.3218.02
NRV-Z3
828.3418.02
NRV-Z4
828.3618.02
NRV-Z5
828.3818.02
NRV-Z6
828.5010.02
NRV-Z15
1081.2305.02
NRV-Z31
857.9604.02/3/4
NRV-Z32
1031.6807.04/5
NRV-Z33
1031.6507.03/4
NRV-Z51
857.9004.02
NRV-Z52
857.9204.02
NRV-Z53
858.0500.02
NRV-Z54
858.0800.02
NRV-Z55
1081.2005.02
Diode Power Sensor 50 Ω
10 MHz to 18 GHz, 200 pW to 20 mW
Diode Power Sensor 50 Ω
10 MHz to 18 GHz, 20 nW to 500 mW
Diode Power Sensor 75 Ω
1 MHz to 2.5 GHz, 100 pW to 13 mW
Diode Power Sensor 50 Ω
100 kHz to 6 GHz, 100 pW to 20 mW
Diode Power Sensor 50 Ω
100 kHz to 6 GHz, 10 nW to 500 mW
Diode Power Sensor 50 Ω
50 MHz to 26.5 GHz, 400 pW to 20 mW
Diode Power Sensor 50 Ω
50 MHz to 40 GHz, 400 pW to 20 mW
Peak Power Sensor 50 Ω
30 MHz to 6 GHz, 1 µW to 20 mW
Peak Power Sensor 50 Ω
30 MHz to 6 GHz, 100 µW to 2(4) W
Peak Power Sensor 50 Ω
30 MHz to 6 GHz, 1 mW to 20 W
Thermal Power Sensor 50 Ω
DC to 18 GHz, 1 µW to 100 mW
Thermal Power Sensor 50 Ω
DC to 26.5 GHz, 1 µW to 100 mW
Thermal Power Sensor 50 Ω
DC to 18 GHz, 100 µW to 10 W
Thermal Power Sensor 50 Ω
DC to 18 GHz, 300 µW to 30 W
Thermal Power Sensor 50 Ω
DC to 40 GHz, 1 µW to 100 mW
Power measurements of highest sensitivity up to 18 GHz in 50-Ω systems
Power measurements with minimum mismatch, for high powers in 50-Ω systems
Power measurements in 75-Ω systems
Power measurements of highest sensitivity in the frequency range 100 kHz to 6 GHz,
very large dynamic range
Like NRV-Z4, but for high powers and minimum mismatch
Power measurements up to 26.5 GHz with high sensitivity in 50-Ω systems (PC 3.5)
Power m easuremen ts up to 40 G Hz with h ig h sen sitivity i n 50 Ω systems (2.92 mm)
Peak power measurements, pulse width ≥2 (200) µs, pulse repetition rate ≥10 (100) Hz,
3 models
Peak power measurements, pulse width ≥2 (200) µs, pulse repetition rate ≥25 (100) Hz,
2 models
Peak power measurements up to 20 W, pulse width ≥2 (200) µs, pulse repetition rate
≥100 Hz, 2 models
High-precision power measurement also with non-sinusoidal signals, N connector
Same as NRV-Z51, but with PC 3.5 connector for measurements up to 26.5 GHz
High-power measurements up to 10 W also with non-sinusoidal signals
High-power measurements up to 30 W also with non-sinusoidal signals
Same as NRV-Z51, but with 2.92 mm connector for measurements up to 40 GHz
RF insertion units
URV5-Z2
395.1019.02
URV5-Z4
395.1619.02
Probes
URV5-Z7
395.2615.02
with 20-dB plug-on
divider*)
with 40-dB plug-on
divider *)
with 50-Ω adapter
URV-Z50
with 75-Ω adapter
URV-Z3
URV5-Z1
395.0512.02
*) pa rt of UR V-Z6
10-V Insertion Unit 50 Ω
200 µV to 10 V, 9 kHz to 3 GHz
100-V Insertion Unit 50 Ω
2 mV to 100 V, 100 kHz to 3 GHz
RF Probe
200 µV to 10 V, 20 kHz to 1 GHz
2 mV to 100 V,
1 to 500 MHz
20 mV to 1000 V,
500 kHz to 500 MHz
200 µV to 10 V,
20 kHz to 1 GHz
200 µV to 10 V,
20 kHz to 500 MHz
DC Probe
1 mV to 400 V, 9 MΩ ll 3 pF
Low-load RF voltage measurements in 50-Ω coaxial systems, low-loss power measurements on well-matched RF lines
Virtually no-load RF voltage measurements in coaxial 50-Ω systems even at higher voltages. Due to minimum insertion loss and reflection coefficient this unit leaves a 50-Ω line
practically unaffected
For measurements in RF circuits at low capacitive and resistive load
The 20-dB and 40-dB plug-on dividers increase the voltage measurement range of the RF
probe; the high Q factor of the capacitive divider makes the resistive loading negligible,
the capacitive loading goes down to 0.5 pF (40-dB divider)
With integrated termination for power or level measurements on test items with a source
impedance of 50 Ω up to 1 GHz
With integrated termination for power or level measurements in 75-Ω systems such as antenna arrays or video equipment
For low-capacitance DC voltage measurements in RF circuits at minimum loading
Power Meter NRVS 5
Automatic filter setting depending on measurement range
Resolution Filter number
HIGH 0.001 dB 11 9 7 7 7 7 7
MEDIUM 0.01 dB 9 7 3 3 3 3 3
LOW 0.1 dB 7 3 0 0 0 0 0
NRV-Z1, -Z3, -Z4, -Z6, -Z15 10 nW 100 nW 1 µW 10 µW 100 µW 1 mW 20 mW
NRV-Z2, -Z5 1 µW 10 µW 100 µW 1 mW 10 mW 100 mW 500 mW
NRV-Z31 – 1 µW 10 µW 100 µW 1 mW 20 mW –
NRV-Z32 – 100 µW 1 mW 10 mW 100 mW 2 (4) W –
NRV-Z33 – 1 mW 10 mW 100 mW 1 W 20 W –
NRV-Z51, -Z52, -Z55 10 µW 100 µW 1 mW 10 mW 100 mW – –
NRV-Z53 1 mW 10 mW 100 mW 1 W 10 W – –
NRV-Z54 10 mW 100 mW 1 W 10 W 30 W – –
URV5-Z2, -Z7 – 1 mV 10 mV 100 mV 1 V 10 V –
URV5-Z4 – 10 mV 100 mV 1 V 10 V 100 V –
Measurement time in seconds (from trigger to output of first byte) depends on filter setting
Filter number 0 1 2 3 4 5 6 7 8 9 10 11 12
NRV-Z1 to -Z15 0.045 0.05 0.06 0.08 0.15 0.27 0.49 0.95 1.85 3.6 7.2 14.5 28.5
NRV-Z31 Mod. 02 1.04 1.04 1.05 1.07 1.13 1.24 1.44 1.84 2.7 4.3 7.5 14 27
NRV-Z31, -Z33 Mod. 03/04
NRV-Z32 Mod. 04
NRV-Z32 Mod. 05 0.435 0.44 0.45 0.47 0.53 0.64 0.84 1.24 2.07 3.7 6.9 14 27
NRV-Z51 to -Z55 0.115 0.12 0.13 0.15 0.21 0.32 0.52 0.92 1.75 3.4 6.6 13 26
URV5-Z2, -Z4, -Z7 0.065 0.07 0.08 0.10 0.20 0.38 0.72 1.45 2.8 5.5 11 22 44
0.135 0.14 0.15 0.17 0.23 0.34 0.54 0.94 1.77 3.4 6.6 13 26
The individual calibration data are stored in a nonvolatile memory in the connector of each measuring
head.
6 Power Meter NRVS
Specifications
Measurement functions average power, pulse power, max. en-
Frequency and level range DC to 40 GHz, 100 pW to 30 W (de-
Measuring heads all voltage and power measuring
Display LCD for figures, units, user prompting
Readout
absolute W, dBm, V, dBµV
relati ve dB, %W o r %V refe rr ed to a sto red ref-
Analog display automatic or with selectable scale
Resolution of digital display 41/2 digits max., resolution adjustable
Averaging filter over 1 to 512 readings for reducing the
Display noise see data sheet of measuring heads
Measurement rate see table (page 6)
Error limits of power readout in W
(excluding measuring head)
18 to 28 °C 0.017 dB (0.4%) + 1 digit
10 to 40 °C 0.039 dB (0.9%) + 1 digit
0 to 50 °C 0.060 dB (1.4 %) + 1 digit
Zero adjustment manual or via IEC/IEEE bus,
Frequency response correction stored frequency response of measur-
Attenuation compensation attenuation or gain connected ahead
Reference value numeric entry via keyboard or IEC/
Reference impedance for conversion between voltage and
Remote control control of all instrument functions via
DC control input for frequency
response correction BNC female, ±12 V, linear with selecta-
DC output BNC female, source impedance 1 kΩ,
velope power, DC and AC voltage (depending on measuring head)
pending on measuring head)
heads NRV-Z and URV5-Z
and analog display
erence value, numeric readout with or
without display of correction frequency
in 3 modes:
HIGH: 12000 steps or 0.001 dB
MEDIUM: 1200 steps or 0.01 dB
LOW: 120 steps or 0.1 dB
display noise;
manual or automatic setting depending
on measurement range and resolution,
see table (page 6)
duration approx. 4 s
ing head taken into account by numerical entry of test frequency (manually or
via IEC/IEEE bus) or by applying a frequency-proportional DC voltage
taken into account; entry of attenuation
value (±200 dB) via keyboard or IEC/
IEEE bus
IEEE bus,
or use of stored measured value
power, automatic readout of reference
impedance from data store in the measuring head or numeric entry via keyboard or IEC/IEEE bus (for RF probe)
IEC 625/IEEE interface;
interface functions: SH1, AH1, T6, L4,
SR1, RL1, DC1, DT1, PP0
ble scale,
input impedance 9 MΩ,
max. input voltage 50 V
output voltage (EMF) proportional to
deflection of analog display, scale
value: left 0 V, right +3 V, additional
settling time 250 ms, error ≤5 mV,
ripple typ. 5 mV (V
)
pp
Sensor Check Source NRVS-B1 (option)
Frequency 50 MHz, crystal-stabilized
Power 1.00 mW; factory-set to ±0.7%
Deviation from nominal 1.2% max. (0.9% RSS) at 10 to 40 °C
SWR 1.05
RF connector N female (at rear panel); N male/SMA
(traceable to PTB)
or 1.6% max. (1.2 % RSS) at 0 to 50 °C,
for 1 year in each case
female adapter for NRV-Z6/-Z52/Z15/-Z55 included
General data
Temperature range to DIN IEC 68-2-1/68-2-2
Operating 0 to +50 °C
Storage –40 to +70°C
Permissible humidity max. 80%, without condensation
Sinusoidal vibration 5 to 55 Hz, max. 2 g; 55 to 150 Hz,
Random vibration 10 to 500 Hz, 1.9 g rms
Sho ck 40 g shock spectrum (to MIL-STD 810 D;
EMC to EN 50 081-1 and 50082-1, EMC di-
Safety to EN 61010-1
Power supply 115 V +15/–22 % (–15%), 47 to 63
Dimensions (W x H x D), weight 219 mm x 103 mm x 350 mm, 3.2 kg
0.5 g cont. (DIN IEC 68-2-6, IEC 1010-1,
MIL-T-28800 D, class 5 complied with)
(to DIN IEC 68-2-36)
DIN IEC 68-2-27 complied with)
rective of EC (89/336/EEC) and EMC
law of the Federal Republic of Germany;
MIL-STD-461 C, RE 02, CE 03, RS 03,
CS 02 complied with
(440) Hz,
230 V +15/–22%, 47 to 63 Hz, 13 VA,
power transformer with thermal overload protection
Ordering information
Order designation Power Meter NRVS
Option
Sensor Check Source NRVS-B1 1029.2908.02
Recommended extras
Rack Adapter ZZA-97 827.4527.00
Transit Case UZ-24 1029.3379.02
Service Kit NRVS-S1 1029.2708.02
1.5
1.2
sensor
1.1
SWR
0.005
1.05
0
.
0
d
B
(0
.
1
1020.1809.02
0.02
d
1
d
B
(0
.
2
%)
%)
0
B
(0
.
5
%)
0
.
1
d
B
.05 dB (1.2%)
(2
0
.2 dB (4.6%)
.
3
%)
Certified Quality System
ISO 9001
DQS REG. NO 1954-04
1.02
1.02
1.05 1.1 2.0
SWR
source
1.5
Maximum measurement error due to mismatch for source power available
into 50 Ω (75 Ω). Values stated in dB and in % of power in W.
Power Meter NRVS 7
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ROHDE& SCHWARZ GmbH & Co. KG ⋅ Muehldorfstrasse 15 ⋅ 81671 Muenchen, Germany ⋅ P.O.B. 80 14 69 ⋅ 81614 Muenchen, Germany
Telephone +49894129-0 ⋅ www.rohde-schwarz.com ⋅ CustomerSupport: Tel. +491805124242, Fax +49 89 41 29-137 77,
E-mail: CustomerSupport@rohde-schwarz.com
PD 756.3182.23 ⋅ Trade names are trademarks of the owners ⋅ Subject to change ⋅ Data without tolerances: typical values Printed in Germany 1098/800 (Bi we/ko)
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