Marconi 6970 User Manual

Power Meters
6970 RF Power Meter
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Hand-held for portability
Battery powered for field use
Wide frequency range: 30 kHz to 46 GHz
Analog bargraph
Excellent accuracy traceable to National Standards
Power levels from -70 dBm (100 pW) to +44 dBm (25 W)
Internal power reference
Audible Pass/Fail limits alarm
Rugged case
Four digit display
The 6970 RF Power Meter provides precision microwave power measurements in a hand portable battery-powered package. A wide range of user features, including duty cycle, rel­ative power measurements and limit checking make the 6970 Power Meter highly versatile. The same wide range of power sensors used with the IFR 6960 Power Meters and the 6200B series Microwave Test Set are used by the 6970.
Field and Bench Use
The 6970 is designed for both field and bench use. For the installa­tion and maintenance engineer the instrument replaces large and expensive meters with no loss of measurement performance. Rechargeable batteries mean that there is no need for an AC supply; this greatly eases measurements at remote sites such as an antenna tower.
Additional benefits of the 6970 are lower cost and portability. An optional soft carrying pouch with both belt loop and shoulder strap enable the 6970 to be easily carried in field environments
For bench operation the instrument takes up little bench space and it can be powered from the AC adapter.
Battery operation is ideal for field operation
High Accuracy
The 6900 series power sensors all have an excellent return loss spec­ification to minimise mismatch errors in power measurements. Correction for power sensor frequency response and high power non-linearity is also provided by entry of calibration factor and lin­earity factor values into the 6970.
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All the power sensors are individually calibrated and supplied with a calibration data chart.
The auto ZERO function reduces offset errors on each of the 6970 ranges. This increases measurement accuracy at low power levels and improves the measurement sensitivity.
Built-In Power Reference
The built-in power reference provides an accurate 0 dBm (1 mW) 50 MHz calibration signal. Power sensors can be calibrated against this reference for improved measurement accuracy and traceability.
The power reference is automatically switched on during a CAL pro­cedure or it can be enabled at any time to provide a traceable 0 dBm signal for verification.
Operation
The instrument front panel consists of a keyboard and a four digit LCD with annunciators. Power levels are clearly displayed on a digi­tal readout with an analog bargraph to facilitate peaking and nulling. Power levels may either be displayed in logarithmic units such as dBm or dBV or in Watts.
To save battery life, the unit powers down six minutes after the last key press. 6970 will operate for 7 hours from a full battery charge. When the instrument powers down the last operator set-up is stored and this will be the state the 6970 assumes when it is next switched on.
Upper and lower power limits can be set. An audio and visual alarm alerts the user of a measurement that is out of limits. This is useful to set a power to a pre-determined level as well as for monitor-ing purposes.
The 6970 is fully auto-ranging but manual range hold is also possible. Manual range selection is used when measuring modulated or unsta­ble signals. The display indicates either AUTO or MAN as appropri­ate and will also provide information of over/under-range conditions.
Wide Range of Power Sensors
The 6970 uses the same rugged IFR power sensors that have been developed for the 6960 Power Meter and 6200B series Microwave Test Set. A wide range of 17 sensors is available covering the frequencies from 30 kHz to 46 GHz. Power level measured depends on sensor type, sensors cover from -70 dBm (0.1 nW) to +44 dBm (25 W).
To cater for the different frequency ranges connector types include N type, PC 3.5 mm, 2.92 mm and N type (75 W).
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Frequency Range
30 kHz to 46 GHz Depending on sensor used
Power Range
-70 dBm (0.1 nW) to +44 dBm (25 W) Depending on sensor used
Power Sensors Supported
6910 series (-30 dBm to +20 dBm) 6920 series (-70 dBm to -20 dBm) 6930 series (-15 dBm to +35 dBm) 6930 series opt 2 (-5 dBm to +44 dBm)
Instrumentation Accuracy Including Carryover
±1% range 0, 1, 2 ±5% range 3
Power Accuracy
After calibration using 0 dBm, 50 MHz power reference: ±0.2 dB Measuring a 50 MHz signal in the centre of the power sensor dynamic range, from a source with a return loss better than 14 dB
DISPLAY
Resolution
4 digits for positive readings 3 digits for negative readings
Units
dBm, nW, mW, mW, W, mV, V, dBV
Annunciators
Analog bargraph, Battery low indicator, Indication of auto-ranging or manual range, Upper and lower limits
CORRECTION
Linearity Factor
Ability to enter in range 0.01 to 15 with 0.01 resolution Defaults to standard setting
Calibration Factor
Ability to enter in range 0.01% to 200% Resolution: 0.01 to 99.99%
0.1 100% and above
Auto-Calibration
Ability to calibrate against a 0 dBm (1 mW), 50 MHz power reference
Auto-Zero
Removes DC offset from gain stages and power sensor
Set
<400 nW (6910 series) <100 pW (6920) <200 pW (6923/6924) <12 mW (6930 series)
Drift
When measured over one hour at constant temperature ±10 nW (6910 series) ±100 pW (6920 series) ±300 nW (6930 series)
NOISE
Averaged over 5 s
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