Agilent Technologies 85330A Timing Sequence Trigger Widths, Trigger Width Description

Service

Theory of Operation

Table 9-1 Timing Sequence Trigger Widths

Trigger	Width			Description
EVENT TRIGGER	1 ∝s≤ tev ≤1 ms			Trigger width dependent on trigger source
MEAS BUSY				Dependent on measurement time of 85330A
RCVR TRIG	1 ∝s≤ trc≤3 ∝ s
RCVR READY:
Switch Settling	Default 2 ∝s			Set by 85330 command- RUNT:SWIT:DEL
Receiver Measurement	typ.	≥	∝	Dependent on measurement time of 8530A
			200 s
SWITCH PORT 1	Variable			Dependent on RCVR TRIG and RCVR READY lines
SWITCH PORT 2	Variable			Dependent on RCVR TRIG and RCVR READY lines
SRC 1 TRIG	10 ∝s≤ tsr1≤14 ∝ s
SRC 2 TRIG	10 ∝s≤ tsr2≤14 ∝ s
Frequency switching	typ ≥5		ms	Dependent on frequency switching time of source
SRC 1 READY	typ 1 ∝s			Trigger width dependent on trigger source
SRC 2 READY	typ 1 ∝s			Trigger width dependent on trigger source

For large systems, the distance between the transmitters and receiver may exceed the physical capabilities of a single controller. For these applications, multiple controllers can be used. The REMOTE1 and REMOTE2 provide the communications between controllers via two balanced twisted-pair wires, similar to RS-422. In defining the runtime parameters, the event sequence is also defined which enables the controllers to operate in unison via these wires.

The AUX POWER IN allows for use of an external ±12 Vdc power supply to be used if the VXI mainframe can not supply the required power for a large switching system, or to compensate for local control cable losses, or special switch voltages. The AUX 1 and AUX 2 outputs can provide a user-controllable TTL line for special applications.

The 85330-60002 card communicates with the switch control units via the SWITCH PORT1 and SWITCH PORT2 connectors. These SCUs decode the switching control signals and provide bias for the Switches. The physical connection of a switch control module is accomplished using one of the two independent output ports on the 85330-60002 card. The separate ports provide the cabling requirements for remote switches to the transmit and receive sites. The cascading feature provides for building switch trees, or simultaneous switching into multiple RF channels.

Switch control units can be individually addressed for independent control, or can share the same address for simultaneous switching or tree configurations. Each module has two bits of unit-address decode and six bits

9-6 85330A Multiple Channel Controller