Atec Agilent-8757D - Manual (Page 3)

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Internal save/recall registers
Up to 9 complete front panel states may be saved
or recalled. If the source (Agilent PSG, 8360 or 8370
series) is connected to the 8757 system interface,
the front panel states of both the network analyzer
and source are saved. Registers 1 through 4 store
the instrument state and the memory traces for
channels 1 and 2. The memory traces for channels
3 and 4 are not stored. Registers 5 through 9 only
store the instrument state.
Display Scale Display Vertical
mode resolution range resolution
dBm 0.1 to 20 dB/div –80 to +80 dBm 0.003 dB 1
(1/2/5 sequence)
dB 0.1 to 20 dB/div –90 to +90 dB 0.006 dB 1
(1/2/5 sequence)
Normalized 0.1 to 20 dB/div –180 to +180 dB 0.01 dB
ratio (1/2/5 sequence)
measurements
SWR 0.02 to 10 units/div 1.0 to 37.0 0.01 at 1
(1/2/4 sequence) 0.1 at 10
0.27 at 30
AUX 0.025 to 5 V/div –10 to +10 V 0.001 V
voltage (1/2.5/5 sequence)
1. 0.01 dB for display cursor
Modulation requirements
Applies to the Agilent 85037 series precision detec-
tors, 85025/26 series detectors, and 85027 series
directional bridges in AC mode.
Square-wave amplitude modulation
Frequency 27,778 Hz ±20 Hz
≥30 dB on/off ratio
45% to 55% symmetry
Rear panel connectors
Sweep voltage requirements (Sweep in)
Horizontal sweep voltage, normally provided by
the sweeper, from 0 to 10 volts.
Marker and blanking requirements (Pos z blank)
Blanking and marker signals are provided by the
sweeper through the “Pos z blank” input on the
rear panel of the Agilent 8757.
Voltage levels
Blanked: +5 V typical
Unblanked: 0 V typical
Marker: –4 V typical
Active marker: –8 V typical
Modulator drive
The modulator drive output of the 8757 scalar
analyzer provides the circuitry to drive the
8340/50/60/70 series synthesized sweepers and the
Agilent 11665B modulator. Modulation drive may
be turned on and off via the front panel or GPIB.
In the “off” state, the modulator drive signal turns
the 11665B fully on for minimum insertion loss.
The 8360 and 8370 synthesized sweepers have the
capability of modulating signals, so an external
modulator such as the 11665B is not necessary
when using the 8360/70 series.
Frequency: 27,778 Hz ±12 Hz
Symmetry: 50% ±1%
Stop sweep
Used with the PSG, 8360 and 8370 series when
controlled by the 8757 system interface to stop the
sweep at band crossings and at the end of sweep.
ADC in
An input connector for auxiliary voltage input
in the –10 to +10 volt range. This voltage can be
displayed (in volts) on any channel.
Control 1 and control 2
These connectors provide digital output signals
(TTL open-collector) as a user convenience for
driving other peripheral equipment in a GPIB
controlled system.
Video outputs
Used to drive an external color monitor that has
the following characteristics:
8757D with LCD monitor (VGA input on the
analyzer’s rear panel)
• VGA compatible
8757D with CRT monitor (RGB inputs on the
analyzer’s rear panel)
• Red, green, and blue (RGB) BNC inputs, sync
on
green
• 75 ohm input impedance
• 26.5 kHz horizontal scan rate
• 60 Hz vertical refresh rate
• 1 V p-p (typically 0.7 V = white; 0 V = black;
-0.3 V = sync)