Keysight Technologies L4490A, User Manual

Page: 141 / 160

Keysight L4490A/L4491A User’s Guide 141
Additional Operating Information
Pairing Channels
With dual-coil devices, the channels in the bank are paired during a bank preset.
Pairing channels allows settings and control to be shared between the two
channels. When paired, channels 1-8 are paired with 11-18 (bank 1), 21-28 with
31-38 (bank 2), 41-48 with 51-58 (bank 3), and 61-68 with 71-78 (bank 4). For
example, a preset of bank 1 (Chapter 4) with an applicable distribution board or
sending the command:
ROUTe:CHANnel:DRIVe:PAIRed:MODE ON, (@1101)
pairs channel 1 and channel 11. A bank preset pairs all channels in a bank as
would the command sent to bank 1:
ROUTe:CHANnel:DRIVe:PAIRed:MODE ON, (@1101:1108)
As mentioned in Chapter 2, paired channels are controlled by a single command
and only the lower channel of the pair is specified. Thus, the settings provided by
the following commands:
ROUTe:CHANnel:DRIVe:PULSe:WIDTh
ROUTe:CHANnel:DRIVe:TIMe:RECovery
ROUTe:CHANnel:DRIVe:TIMe:SETTle
ROUTe:CHANnel:VERify:ENABle
apply to both channels in the pair.
Paired Drive With Separate Position Indicators
The simplified schematic below illustrates the connection for a dual coil switch
with separate position indicators. The position indicators for this type of switch are
independent relay contacts that are mechanically linked to the RF switch position.
The RF paths are not shown in the simplified diagram. The coils are driven in open
collector mode. The position indicator is set so that a high level indicates an active
switch. The logic level of the position indicator can be inverted using the
ROUTe:CHANnel:VERify:POLarity
command.
As shown, Channel 01 was pulsed to close Coil A. The corresponding position
indicator also closed. Closing position indicator A opens position indicator B.