Atec 8650A User Manual

8650A

S

ERIES

UNIVERSAL

PO WER
M

ETERS

The Capabilities to Test T oday’s
Sophisticated Communications Systems

8650A SERIES

UNIVERSAL

POWER

METERS

The Giga-tronics 8650A
Series Universal Power
Meters have the extensive
measurement capabilities and
unique features required to
test today’s sophisticated
communications systems
faster and more accurately.

TDMA

The 8650A can automatically
measure the average power
of pulse modulated signals or
pulse signals that are ampli-

tude modulated during the
pulse ‘on’ period — such as
TDMA signals.

Using the exclusive Burst
Average Power mode (BAP),
the average power reading in
the pulse burst is automati­cally measured between the
3 dB points. Therefore,the
duty cycle can change in time

without affecting the accura­cy of the meter reading. This
method eliminates the need
to manually set time gating,
which can add errors if the
gate is not set accurately.

GSM

The Time Gating feature of
the 8650A lets you program

The Giga-tronics 8650A Series combines the speed,range and capabilities needed to test today’s sophisticated communications systems.

TIME GATE

5% 95%

TIME

POWER

BURST

POWER

TIME

AVERAGE
POWER

a measurement start time
and duration to measure the
average power during a spe­cific time period of a GSM
burst signal. The graphic dis­play provides visual feedback
if you prefer to set the gate
manually. And,of course,
there is the ability to use the
TTL signal for automatically
setting the time gate control.

CDMA

The 8650A has the wide,
80 dB single sensor dynamic
range required for CDMA
signal open-loop tests,the
speed you need to quickly
measure power during
closed-loop tests,and the
10 MHz bandwidth needed
to test third-generation
CDMA signals.

INSTANTANEOUS
PEAK POWER

You can also measure the
instantaneous peak power
level of a pulse modulated
signal with the 8650A.

A built-in delay line lets you
trigger a few nanoseconds
ahead of the pulse for rising
edge measurements. While a
built-in time base gives you
sample delay control up to
100 ms after the trigger
point with 0.5 ns resolution.
And you can view the profile
and see the exact measure­ment point on the pulse.

MAXIMUM PEAK
PO WER

The peak hold feature of the

8650A lets you display the
highest instantaneous power
measured from the time the
feature is enabled until it is
reset.

The display value tracks

the measured value only

when it is rising to a new
maximum;when the meas­ured value falls,the display
value holds at the maximum.

GPIB CW Measurement Speed (rdgs/s)

Normal Mode >300
Swift Mode >1,750
Fast Buffered Mode >26,000

GPIB Modulated Measurement Speed (rdgs/s)

Normal Mode >150
Swift Mode >800
Fast Modulated Mode >800

Asynchronous Sample Rate 2.5–5 MHz
Maximum Diode Sensor Video Bandwidth 20 MHz

Maximum Instrument Video Bandwidth 10 MHz
Maximum Single Sensor CW Dynamic Range 90 dB

Maximum Single Sensor Modulation Dynamic Range

TDMA/GSM 60–80 dB
CDMA (IS-95) 80 dB

Wideband CDMA (10 MHz bandwidth) 80 dB
Maximum Peak Power Sensor Rise Time 100 ns
Automatic Time Gate Setting Yes
Direct Crest Factor Measurement Yes
Statistical Power Measurement Analysis Yes

Giga-tronics 8650A Features and Specifications

SELECTED
SAMPLE
POINT

AVERAGE

POWER

80 dB

HOLD

POWER

TIME

HOLD

HOLD

(RESET)

POWER

FREQUENCY

Or use our
exclusive fast
buffered
mode to

further
reduce processor overhead
and capture over 26,000
readings per second.

Incredible
speed for CW
and modulated
measurements
results from an
asynchronous
sampling rate of 2.5 to
5 MHz,that minimizes the
aliasing effects of signals to
produce faster average
power measurements.

And the 8650A features a
wide variety of statistical
power meas­urement analy­sis,to evaluate
communica­tions system
efficiency.

BURST START AND
END EXCLUDE

The exclusive burst start and
end exclude capabilities of
the 8650A allow you to
exclude the beginning or end
of a burst when measuring
the average burst power.

Masking the beginning or
the end of a burst signal,in
order to exclude overshoot
or other distortions,can be
desirable or even required
for certain types of power
measurements.

CREST FACTOR

The crest factor capability of
the 8650A displays the ratio
of the maximum peak power
(peak hold) measurement to
the average power measure­ment (in dB) from the time
the feature is enabled until it
is reset.

The crest factor capability
operates in the same manner
as the peak hold capability:
the display value holds at the
maximum until it is reset.

INCREDIBLE SPEED
AND STATISTICAL
ANALY SIS

No other meter delivers the
measurement speed available
from the 8650A.

Achieve over 1,750 read-

ings per second over GPIB.

The Features to do the Job
Faster,Easier and More Accurately

HOLD

HOLD

HOLD

CREST
FACTOR

(dB)

AVG.

HOLD

HOLD

POWER

TIME

(RESET)

HOLD

AVG.

CREST
FACTOR

(dB)

POWER

TIME

BURST WIDTH

EXCLUDE INCLUDE IN BURST AVERAGE

BURST START EXCLUDE

TIME

POWER

BURST WIDTH

INCLUDE IN BURST AVERAGE EXCLUDE

BURST END EXCLUDE