Agilent N1911A Data Sheet

Agilent

N1911A/N1912A P-Series Power Meters and
N1921A/N1922A Wideband Power Sensors

Data sheet

2

LXI Class-C-Compliant Power Meter

A P-series power meter is a LXI Class-C-compliant instrument,
developed using LXI Technology. LXI, an acronym for LAN
eXtension for Instrumentation, is an instrument standard for
devices that use the Ethernet (LAN) as their primary
communication interface.

Hence, it is an easy- to- use instrument especially with the usage
of an integrated Web browser that provides a convenient way to
configure the instrument’s functionality.

Specification Definitions

There are two types of product specifications:

Warranted specifications are specifications which are covered by
the product warranty and apply over a range of 0 to 55 ºC unless
otherwise noted. Warranted specifications include measurement
uncertainty calculated with a 95 % confidence.

Characteristic specifications are specifications that are not
warranted. They describe product performance that is useful in
the application of the product. These characteristic specifications
are shown in italics.

Characteristic information is representative of the product. In many
cases, it may also be supplemental to a warranted specification.
Characteristic specifications are not verified on all units. There
are several types of characteristic specifications. They can be
divided into two groups:

One group of characteristic types describes ‘attributes’ common to
all products of a given model or option. Examples of characteristics
that describe ‘attributes’ are the product weight and ‘50-ohm
input Type-N connector’. In these examples, product weight is an
‘approximate’ value and a 50-ohm input is ‘nominal’. These two
terms are most widely used when describing a product’s
‘attributes’.

Conditions

The power meter and sensor will meet its specifications when:

• stored for a minimum of two hours at a stable temperature
within the operating temperature range, and turned on for at
least 30 minutes

• the power meter and sensor are within their recommended
calibration period, and

• used in accordance to the information provided in the
User's Guide.

General Features

Number of channels N1911A P-series power meter, single channel

N1912A P-series power meter, dual channel

Frequency range N1921A P-series wideband power sensor, 50 MHz to 18 GHz

N1922A P-series wideband power sensor, 50 MHz to 40 GHz

Measurements Average, peak and peak-to-average ratio power measurements are provided with free-run or time-gated

definitions.
Time parameter measurements of pulse rise time, fall time, pulse width, time-to-positive occurrence and
time-to-negative occurrence are also provided.

Sensor compatibility P-series power meters are compatible with all Agilent P-series wideband power sensors, E-series sensors

and 8480-series power sensors

1

. Compatibility with the 8480 and E-series power sensors will be available

free-of-charge in firmware release Ax.03.01and above.

1. Information contained in this document refers to operations using
P-series sensors. For specifications relating to the use of 8480 and
E-series sensors (except E9320A range), refer to Lit Number 5965-6382E.
For specifications relating to the use of E932XA sensors, refer to Lit
Number 5980-1469E.

3

P-Series Power Meter and Sensor
Key System Specifications and Characteristics

2

Maximum sampling rate 100 Msamples/sec, continuous sampling
Video bandwidth

≥

30 MHz

Single-shot bandwidth

≥

30 MHz

Rise time and fall time ≤ 13 ns (for frequencies ≥ 500 MHz)3,

see Figure 1

Minimum pulse width 50 ns

4

Overshoot

≤

5 %

3

Average power measurement accuracy N1921A: ≤ ± 0.2 dB or ± 4.5 %

5

N1922A: ≤ ± 0.3 dB or ± 6.7 %

Dynamic range –35 dBm to +20 dBm (> 500 MHz)

–30 dBm to +20 dBm (50 MHz to 500 MHz)
Maximum capture length 1 second
Maximum pulse repetition rate 10 MHz (based on 10 samples per period)

Figure 1. Measured rise time percentage error versus signal under test rise time

Although the rise time specification is ≤ 13 ns, this does not mean that the P-series
meter and sensor combination can accurately measure a signal with a known rise time
of 13 ns. The measured rise time is the root sum of the squares (RSS) of the signal
under test rise time and the system rise time (13 ns):

Measured rise time = √((signal under test rise time)

2

+ (system rise time)2),

and the % error is:

% Error = ((measured rise time – signal under test rise time)/signal under test

rise time) x 100

2. See Appendix A on page 9 for measurement uncertainty calculations.

3. Specification applies only when the Off video bandwidth is selected.

4. The Minimum Pulse Width is the recommended minimum pulse width

viewable on the power meter, where power measurements are
meaningful and accurate, but not warranted.

5. Specification is valid over a range of –15 to +20 dBm, and a frequency

range of 0.5 to 10 GHz, DUT Max. SWR < 1.27 for the N1921A, and a
frequency range of 0.5 to 40 GHz, DUT Max. SWR < 1.2 for the N1922A.
Averaging set to 32, in Free Run mode.

4

P-Series Power Meter Specifications

Meter uncertainty

Instrumentation linearity ± 0.8 %

Timebase

Timebase range 2 ns to 100 msec/div
Accuracy ±10 ppm
Jitter ≤ 1 ns

Trigger

Internal trigger

Range –20 to +20 dBm
Resolution 0.1 dB
Level accuracy ± 0.5 dB
Latency

6

160 ns ± 10 ns

Jitter: ≤ 5 ns rms

External TTL trigger input

High > 2.4 V
Low < 0.7 V
Latency

7

90 ns ± 10 ns

Minimum trigger

pulse width 15 ns

Minimum trigger

repetition period 50 ns

Impedance 50

W

Jitter ≤ 5 ns rms

External TTL trigger output Low to high transition on

trigger event
High > 2.4 V
Low < 0.7 V
Latency

8

30 ns ± 10 ns

Impedance 50

W

Jitter ≤ 5 ns rms

Trigger delay

Delay range ± 1.0 s, maximum
Delay resolution 1 % of delay setting

10 ns maximum

Trigger hold-off

Range 1 µs to 400 ms
Resolution 1 % of selected value

(to a minimum of 10 ns)

Trigger level threshold hysteresis

Range ± 3 dB
Resolution 0.05 dB

6. Internal trigger latency is defined as the delay between the applied RF
crossing the trigger level and the meter switching into the triggered state.

7. External trigger latency is defined as the delay between the applied trigger
crossing the trigger level and the meter switching into the triggered state.

8. External trigger output latency is defined as the delay between the meter
entering the triggered state and the output signal switching.

5

P-Series Wideband Power Sensor Specifications

The P-series wideband power sensors are designed for use with the P-series power meters only.

Sensor model Frequency range Dynamic range Damage level Connector type
N1921A 50 MHz to 18 GHz –35 dBm to +20 dBm (≥ 500 MHz) +23 dBm (average power); Type N (m)

–30 dBm to +20 dBm (50 MHz to 500 MHz) +30 dBm (< 1 µs duration)

(peak power)

N1922A 50 MHz to 40 GHz –35 dBm to +20 dBm (≥500 MHz) +23 dBm (average power); 2.4 mm (m)

–30 dBm to +20 dBm (50 MHz to 500 MHz) +30 dBm (< 1 µs duration)

(peak power)

Maximum SWR

Frequency band N1921A N1922A

50 MHz to 10 GHz 1.2 1.2
10 GHz to 18 GHz 1.26 1.26
18 GHz to 26.5 GHz 1.3

26.5 GHz to 40 GHz 1.5

Sensor Calibration Uncertainty

9

Definition: Uncertainty resulting from non-linearity in

the sensor detection and correction process. This can be
considered as a combination of traditional linearity, cal
factor and temperature specifications and the uncertainty
associated with the internal calibration process.

Frequency band N1921A N1922A

50 MHz to 500 MHz 4.5 % 4.3 %
500 MHz to 1 GHz 4.0 % 4.2 %
1 GHz to 10 GHz 4.0 % 4.4 %
10 GHz to 18 GHz 5.0 % 4.7 %
18 GHz to 26.5 GHz 5.9 %

26.5 GHz to 40 GHz 6.0 %

Physical characteristics

Dimensions N1921A 135 mm x 40 mm x 27 mm (5.3 in x 1.6 in x 1.1 in)

N1922A 127 mm x 40 mm x 27 mm (5.0 in x 1.6 in x 1.1 in)

Weights with cable Option 105 0.4 kg (0.88 Ib)

Option 106 0.6 kg (1.32 Ib)
Option 107 1.4 kg (3.01 Ib)

Fixed sensor cable lengths Option 105 1.5 m (5-feet)

Option 106 3.0 m (10-feet)
Option 107 10 m (31-feet)

9. Beyond 70 % humidity, an additional 0.6 % should be added to these
values.

6

1 mW Power Reference

Note: The 1 mW power reference is provided for calibration of E-series and 8480-series sensors. The P-series sensors are automatically

calibrated and therefore do not need this reference for calibration

Power output 1.00 mW (0.0 dBm). Factory set to ± 0.4 % traceable to the National Physical Laboratory (NPL) UK
Accuracy (over 2 years) ±1.2 % (0 to 55 ºC)

±0.4 % (25 ± 10 ºC)
Frequency 50 MHz nominal
SWR 1.08 (0 to 55 ºC)

1.05 typical

Connector type Type N (f), 50 W

Rear-panel inputs/outputs

Recorder output Analog 0-1 Volt, 1 kW output impedance, BNC connector. For dual-channel instruments there will be two

recorder outputs.
GPIB, 10/100BaseT LAN Interfaces allow communication with an external controller.
and USB2.0
Ground Binding post, accepts 4 mm plug or bare-wire connection
Trigger input Input has TTL compatible logic levels and uses a BNC connector
Trigger output Output provides TTL compatible logic levels and uses a BNC connector
Line power

Input voltage range 90 to 264 Vac, automatic selection
Input frequency range 47 to 63 Hz and 440 Hz
Power requirement N1911A not exceeding 50 VA (30 Watts)

N1912A not exceeding 75 VA (50 Watts)

Remote programming

Interface GPIB interface operates to IEEE 488.2 and IEC65

10/100BaseT LAN interface

USB 2.0 interface
Command language SCPI standard interface commands
GPIB compatibility SH1, AH1, T6, TE0, L4, LE0, SR1, RL1, PP1, DC1, DT1, C0

Measurement speed

Measurement speed via remote interface

≥

1500 readings per second

Regulatory information

Electromagnetic compatibility Complies with the requirements of the EMC Directive 89/336/EEC.
Product safety Conforms to the following product specifications:

EN61010-1: 2001/IEC 1010-1:2001/CSA C22.2 No. 1010-1:1993
IEC 60825-1:1993/A2:2001/IEC 60825-1:1993+A1:1997+A2:2001
Low Voltage Directive 72/23/EEC

Physical characteristics

Dimensions The following dimensions exclude front and rear panel protrusions:

7

88.5 mm H x 212.6 mm W x 348.3 mm D (3.5 in x 8.5 in x 13.7 in)

Net weight N1911A

≤

3.5 kg (7.7 lb) approximate

N1912A

≤

3.7 kg (8.1 lb) approximate

Shipping weight N1911A

≤

7.9 kg (17.4 lb) approximate

N1912A

≤

8.0 kg (17.6 lb) approximate

Environmental conditions

General Complies with the requirements of the EMC Directive 89/336/EEC.
Operating

Temperature 0 °C to 55 °C
Maximum humidity 95 % at 40 °C (non-condensing)
Minimum humidity 15 % at 40 °C (non-condensing)
Maximum altitude 3,000 meters (9,840 feet)

Storage

Non-operating storage temperature –30 °C to +70 °C
Non-operating maximum humidity 90 % at 65 °C (non-condensing)
Non-operating maximum altitude 15,420 meters (50,000 feet)

System Specifications and Characteristics

The video bandwidth in the meter can be set to High, Medium, Low and Off. The video bandwidths stated in the table below are
not the 3 dB bandwidths, as the video bandwidths are corrected for optimal flatness (except the Off filter). Refer to Figure 2 for
information on the flatness response. The Off video bandwidth setting provides the warranted rise time and fall time specification
and is the recommended setting for minimizing overshoot on pulse signals.

Dynamic response - rise time, fall time, and overshoot versus video bandwidth settings

Video bandwidth setting

Parameter

Low: 5 MHz Medium: 15 MHz High: 30 MHz

Off

< 500 MHz > 500 MHz

Rise time/ fall time

10

< 56 ns < 25 ns

≤

13 ns < 36 ns ≤ 13 ns

Overshoot

11

< 5 % < 5 %

For option 107 (10m cable), add 5 ns to the rise time and fall time specifications.

Recorder Output and Video Output

The recorder output is used to output the corresponding voltage for the measurement a user sets on the Upper/Lower
window of the power meter.

The video output is the direct signal output detected by the sensor diode, with no correction applied. The video
output provides a DC voltage proportional to the measured input power through a BNC connector on the rear panel. The
DC voltage can be displayed on an oscilloscope for time measurement. This option replaces the recorder output on the
rear panel. The video output impedance is 50 ohm.

10. Specified as 10 % to 90 % for rise time and 90 % to 10 % for fall time on

a 0 dBm pulse.

11. Specified as the overshoot relative to the settled pulse top power.

8

Characteristic Peak Flatness

The peak flatness is the flatness of a peak-to-average ratio measurement for various tone separations for an equal magnitude two-tone
RF input. Figure 2 refers to the relative error in peak-to-average ratio measurements as the tone separation is varied. The measurements
were performed at –10 dBm with power sensors with 1.5 m cable lengths.

Figure 2. N192XA Error in peak-to-average measurements for a two-tone input (High, Medium, Low and Off filters)

Noise and drift

Sensor model

Zeroing

Zero set

Zero drift

12

Noise per sample

Measurement noise

< 500 MHz > 500 MHz (Free run)

13

N1921A /N1922A No RF on input 200 nW

100 nW 2 µW 50 nW

RF present 550 nW 200 nW

Measurement average setting 12481632641282565121024

Free run noise multiplier 1 0.9 0.8 0.7 0.6 0.5 0.45 0.4 0.3 0.25 0.2

Video BW setting Low 5 MHz Medium 15 MHz High 30 MHz Off

Noise per sample multiplier < 500 MHz 0.5 1 2 1

≥ 500 MHz 0.45 0.75 1.1 1

Effect of video bandwidth setting

The noise per sample is reduced by applying the meter video
bandwidth filter setting (High, Medium or Low). If averaging is
implemented, this will dominate any effect of changing the video
bandwidth.

Effect of time-gating on measurement noise

The measurement noise on a time-gated measurement will
depend on the time gate length. 100 averages are carried out
every 1 µs of gate length. The Noise-per-Sample contribution in
this mode can approximately be reduced by √(gate length/10 ns)
to a limit of 50 nW.

12. Within 1 hour after a zero, at a constant temperature, after 24 hours

warm-up of the power meter. This component can be disregarded with
Auto-zero mode set to ON.

13. Measured over a one-minute interval, at a constant temperature, two

standard deviations, with averaging set to 1.

9

Appendix A

Uncertainty calculations for a power measurement (settled, average power)

[Specification values from this document are in bold italic, values calculated on this page are underlined.]

Process:

1. Power level: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

W

2. Frequency: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Calculate meter uncertainty:

Calculate noise contribution

• If in Free Run mode, Noise

= Measurement noise x free run multiplier

• If in Trigger mode, Noise

= Noise-per-sample x noise per sample multiplier

Convert noise contribution to a relative term

14

= Noise/Power . . . . . . . . . . . . . . . . . . . . . . . . . . %

Instrumentation linearity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . %

Drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . %

RSS of above three terms => Meter uncertainty

= . . . . . . . . . . . . . . . . . . . . . . . . . . . . . %

4. Zero Uncertainty

(Mode and frequency-dependent) = Zero set/Power

= . . . . . . . . . . . . . . . . . . . . . . . . . . %

5. Sensor calibration uncertainty

(Sensor, frequency, power and temperature-dependent) = . . . . . . . . . . . . . . . . . . . . . . . . %

6. System contribution

, coverage factor of 2 => sys

rss

= . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . %

(RSS three terms from steps 3, 4 and 5)

7. Standard uncertainty of mismatch

Max SWR (Frequency-dependent) = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

convert to reflection coefficient, |

r

Sensor

| = (SWR–1)/(SWR+1) = . . . . . . . . . . . . . . . . . . .

Max DUT SWR (Frequency dependent) = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

convert to reflection coefficient, |

r

DUT

| = (SWR–1)/(SWR+1) = . . . . . . . . . . . . . . . . . . . . .

8. Combined measurement uncertainty @ k=1

. . . . . . . . . . . . . . . . . . . . . . %

Expanded uncertainty, k = 2, = U

C

• 2 = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . %

14. The noise-to-power ratio is capped for powers > 100 µW, in these

cases use: Noise/100 µW.

Max(

r

DUT

) • Max(

r

Sensor

) sys

rss

2

+

2

2

2

U

C

=

10

Worked Example

Uncertainty calculations for a power measurement (settled, average power)

[Specification values from this document are in bold italic, values calculated on this page are underlined.]

Process:

1. Power level: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 mW

2. Frequency: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 GHz

3. Calculate meter uncertainty: In free run, auto zero mode average = 16

Calculate noise contribution

• If in Free Run mode, Noise

= Measurement noise x free run multiplier = 50 nW x 0.6 = 30 nW

• If in Trigger mode, Noise

= Noise-per-sample x noise per sample multiplier

Convert noise contribution to a relative term

15

= Noise/Power = 30 nW/100 µW . . . . . . . . . 0.03 %

Instrumentation linearity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 %

Drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –

RSS of above three terms => Meter uncertainty

= . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 %

4. Zero Uncertainty

(Mode and frequency dependent) = Zero set/Power

= . . . . . . . . . . . . . . . . . . . . . . . . . . 0.03 %

5. Sensor calibration uncertainty

300 nW/1 mW

(Sensor, frequency, power and temperature-dependent) = . . . . . . . . . . . . . . . . . . . . . . . . 4.0 %

6. System contribution

, coverage factor of 2 => sys

rss

= . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.08 %

(RSS three terms from steps 3, 4 and 5)

7. Standard uncertainty of mismatch

Max SWR (Frequency-dependent) = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25

convert to reflection coefficient, |

r

Sensor

| = (SWR–1)/(SWR+1) = . . . . . . . . . . . . . . . . . . . 0.111

Max DUT SWR (Frequency-dependent) = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.26

convert to reflection coefficient, |

r

DUT

| = (SWR–1)/(SWR+1) = . . . . . . . . . . . . . . . . . . . . . 0.115

8. Combined measurement uncertainty @ k = 1

. . . . . . . . . . . . . . . . . . . . . . 2.23 %

Expanded uncertainty, k = 2, = U

C

• 2 = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4.46 %

15. The noise-to-power ratio is capped for powers > 100 µW, in these

cases use: Noise/100 µW instead.

Max(

r

DUT

) • Max(

r

Sensor

) sys

rss

2

+

2

2

2

U

C

=

11

Graphical Example

A. System contribution to measurement uncertainty versus power level (equates to step 6 result/2)

Note: The above graph is valid for conditions of free-run operation, with a signal within the video bandwidth setting on the system.
Humidity < 70 %.

B. Standard uncertainty of mismatch

SWR r SWR r

1.0 0.00 1.8 0.29

1.05 0.02 1.90 0.31

1.10 0.05 2.00 0.33

1.15 0.07 2.10 0.35

1.20 0.09 2.20 0.38

1.25 0.11 2.30 0.39

1.30 0.13 2.40 0.41

1.35 0.15 2.50 0.43

1.40 0.17 2.60 0.44

1.45 0.18 2.70 0.46

1.5 0.20 2.80 0.47

1.6 0.23 2.90 0.49

1.7 0.26 3.00 0.50

Note: The above graph shows the Standard Uncertainty of Mismatch = rDUT. rSensor /-2, rather than the Mismatch Uncertainty
Limits. This term assumes that both the Source and Load have uniform magnitude and uniform phase probability distributions.

C. Combine A & B

Expanded Uncertainty, k = 2, = 2. UC= . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± %

System uncertainty contribution - 1 sigma (%)

1.0%

10.0%

100.0%

-35 -30 -25 -20 -15 -10 -5 0 5 10 15 20

Power (dBm)

N1921A: 500 MHz to 10 GHz
N1922A:18 to 40 GHz
Other bands

Standard uncertainty of mismatch - 1 sigma (%)

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

0 0.1 0.2 0.3 0.4 0.5

r

Sensor

r

DUT

2

U

C

=

(Value from Graph A) + (Value from Graph B)

2

Related Literature

P-Series Power Meters and Power
Sensors, Technical Overview,

literature number 5989-1049EN

P-Series Power Meters and Power
Sensors, Configuration Guide,

literature number 5989-1252EN

E2094N IO Libraries Suite 14.0,
Data Sheet, literature number 5989-

1439EN

EPM-P Series Power Meters and
E9320 Peak and Average Power
Sensors, Data Sheet, literature

number 5980-1469E

EPM Series Power Meters, E-Series,
and 8480 Series Power Sensors,
Data Sheet, literature number 5965-

6382E

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