![background image](http://html1.mh-extra.com/html/keithley/system-40/system-40_instruction-manual_4099272016.webp)
2-3
Switch life
The life of a switch is usually specified in cycles, that is the number of times it switches from one position to another and back.
System 40 RF switches have lives from one-million to ten-million (1,000,000 to 10,000,000) cycles per switch position without
noticeable performance degradation.
NOTE
Cold switching (no RF power applied), hot switching (RF power applied) may rapidly
degrade switch performance.
That is:
• No intermittent contacts
• Less than 0.1 dB increase in insertion loss
• Less than 0.3 ohm increase in DC contact resistance
Model 7020-MWS/7020-QCC specifications
Digital I/O
Capability:
40 independent inputs.
40 independent outputs.
Output configuration:
40 open collector drivers (channels). Each driver has an internal flyback diode.
Pull-up voltage:
5.3 V internally supplied, external connection provided for user supplied voltage,
30V max. Removal of internal jumper allows user to use two different pull-up voltages.
Maximum sink current:
Per Channel: 300mA
Per Card: 2.5A
Current limit:
Output current limited to 500mA per channel.
Collector-emitter:
<1V @ 300mA
Logic:
Negative true.
Input configuration:
40 inputs with internal 10k
Ω
pull-up resistors.
Characteristics:
Input logic low voltage:
0.8V max.
Input logic high voltage:
2V min.
Input logic low current:
-600µA max. @0V
Input logic high current:
50µA max. @5V
Maximum voltage level:
42V pk.
Logic:
Positive true.
General
Connector:
96-pin DIN
50-pin Header (7020-MWS only)
Warranty:
1 year
Standards:
Safety:
Conforms with European Union Directive 73/23/EEC
EMC:
Conforms with European Union Directive 89/336/EEC
Environment:
Operating: 0°C to 50°C, <80% relative humidity: (0° to 35°C)
Storage:
-25°C to +65°C
Specifications subject to change without notice.
CAUTION
Exceeding the output sink current specifications may cause damage to the Model
7020-MWS/QCC card. This card is not intended for use in applications other than the
System 40.