Atec Aeroflex-6820A Series - Manual (Page 6)

RETURN LOSS MEASUREMENTS
Measurement Update Rate
401 points in 270 ms with DC detection
Calibration
Short, Open, Short/Open
Inputs
Single input or ratio
Accuracy
Linearity + directivity + test port mismatch
Linearity (for Power Levels >-45 dBm)
±0.2 dB / 10 dB but not > 0.5 dB in total
FAULT LOCATION MEASUREMENTS
Measurement Range
Up to 25 km depending on cable or waveguide loss
Units
Feet or meters
Number of Measurement Points
User selectable from 50 to 1601
Minimum Resolution
For two equal amplitude discontinuities using maximum sweep width
6821A: 12.18 x Vr cm
6822A: 4.32 x Vr cm
6823A: 1.82 x Vr cm
6824A: 1.51 x Vr cm
6825A: 0.91 x Vr cm
where Vr is the relative velocity factor for the transmission line
Measurement Update Rate
512 points in 250 ms, DC detection
Dynamic Range
DC detection 70 dB
AC detection 80 dB
Distance Accuracy
3 mm or 0.1% of range for a single fault
Transmission Line Database
Data supplied as standard
Required Accessory
624X series fault locator or 658X series transmission line test head or
accessory power divider (see optional accessories)
FREQUENCY STANDARD
Internal 10 MHz OCXO
Drift
±5 in 10 8 over 0 to 55°C
Ageing
±2 in 10 7 per year (OCXO)
External Frequency Standard
1 MHz or 10 MHz, Connector: BNC
REAR PANEL CONNECTORS
RS-232
9 way D-type connector, male
Baud rate 300 to 9600
GPIB Interface
GPIB is IEEE 488.1 and 488.2 compatible. The interface has 2 func-
tions.
-Instrument control with full Talk/Listen capability
-Control of plotter using HPGL. Plotter is buffered to permit measure-
ments to proceed whilst plotting.
Frequency Standard In/Out BNC
1 MHz or 10 MHz input or 10 MHz output selectable from front panel
Mod In/Out BNC
Mod in/out
Rear panel BNC connector, TTL level. Impedance approx 100
Ω
Printer Outputs
USB (Front Panel) or 25 way D-type connector Parallel Interface
External Monitor
Standard VGA, 640 by 480 color output
15 way high density D-type female connector
Voltage Output
Auxiliary 9-pin connector
Settable for 0 to 10 V ramp, fixed voltage or chart recorder drive
External Levelling Input
Input voltage range: 0 to +1 V
Connector: BNC
GENERAL FEATURES
Number of Display Channels
2
Number of Measurements
4 (2 per display channel)
Number of Measurement Points
2 to 1601 for one trace, scalar
Display
Color active matrix TFT liquid crystal display with 16.5 cm (6.5 in)
visible diagonal
Data Storage
USB Flash Memory
MARKERS
8 per trace plus separate delta marker
Marker Functions
Marker, delta marker, minimum, maximum, search left, search right,
N-dB bandwidth (with center frequency), marker tracking.
Scalar Analyzer
Active marker Max / Min
Max / Min Tracking
Find PK-PK
PK-PK Tracking
Search Right / Left