Keithley 3730 User Manual

Section
9: Series 3700 Module Schematics and Connections Series 3700 System Switch/Multimeter
User's Manual
9
-2 Document Number: 3700S-900-
01 Rev. A / August 2007
Power budgeting and calculation
Individual relay power consumption generally depends on the type of relay. Latching type relays
consume power only briefly in order to open or close. These types of relays are not of concern
for power budgeting purposes. Non-latching types of relays consume power in a sustained
fashion in order to maintain their state. These types of relays must be considered for power
budgeting purposes.
Another power consideration is the fact that each plug in card consumes an amount of system
power in order to operate. This sustained (and roughly constant) power draw is known as
quiescent power. Quiescent power directly takes away from the power available to operate
relays. So it must also be taken into account when budgeting for power consumption.
The following table shows the power consumption of channel and backplane relays for various
Series 3700 plug-in cards. The quiescent power is also shown. For latching type relays an "NA"
is shown.
Model
Quiescent
Power
(Milliwatts)
Channel Relay Power
Consumption
(Milliwatts) Each
Backplane Relay Power
Consumption
(Milliwatts) Each
3720
975
NA
100
3721
1350
NA
100
3722
475
NA
100
3723
700
100 (2 Pole)
100
50 (1 Pole)
100
3730
780
NA
100
3740
1000
NA (Independent)
100
200 (High Current)
100

Keithley 3730 Specifications

General

Brand	Keithley
Model	3730
Category	Multimeter
Language	English