Agilent
N1911A/N1912A P-Series Power
Meters and N1921A/N1922A
Wideband Power Sensors
Data sheet
2
Specification Definitions
There are two types of product specifications:
Warranted specifications are specifications which are covered by
the product warranty and apply over 0 to 55ºC 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. These types
can be placed in 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 product weight, and 50 ohm input
Type-N connector. In these examples product weight is an ‘approximate’ value and a 50ohm input is ‘nominal’. These two terms are
most widely used when describing a product’s ‘attributes’.
The second group describes ‘statistically’ the aggregate performance
of the population of products.
These characteristics describe the expected behavior of the
population of products. They do not guarantee the performance
of any individual product. No measurement uncertainty value is
accounted for in the specification. These specifications are
referred to as ‘typical’.
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
definition.
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
in a future firmware release, free of charge.
1. Information contained in this document refers to operation with P-Series
sensors. For specifications when used with 8480 and E-series sensors
(except E9320A range), refer to Lit Number 5965-6382E. For specifications
when used with 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 –15 to +20 dBm, and a frequency range 0.5 to
10 GHz, DUT Max. SWR < 1.27 for the N1921A, and a frequency range
0.5 to 40 GHz, DUT Max. SWR < 1.2 for the N1922A. Averaging set to 32,
in Free Run mode.
Signal under test rise time (nS)
Percent error
15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
35
30
25
20
15
10
5
0
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 0.1dB
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 Ω
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 Ω
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.
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