EasyManuals Logo

Keithley 2450 User Manual

Keithley 2450
878 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #210 background imageLoading...
Page #210 background image
Model 2450
Interactive SourceMeter® Instrument Reference Manual Section 3:
Functions and features
2450-901-01 Rev. B/September 2013 3-65
Vext line
The digital I/O allows connection to an external voltage through a flyback diode clamped line (Vext).
You can connect to the Vext line through the Vext pin (pin 5) and the specified digital I/O line. Use
this connection to drive relay drive coils, a low power solenoid, or similar external inductive circuitry.
The externally supplied voltage can be up to +5 V.
Do not apply more than 50 mA (maximum current) or exceed +5 V (maximum voltage) on the digital
I/O port. Applying current or voltage exceeding these limits may damage the instrument.
Refer to the following figure for a simplified schematic of a sample digital I/O Vext relay circuit. You
can externally power other devices by replacing the relay coil with the other device. When using the
Vext pin to control externally powered devices, make sure to configure the corresponding digital
output lines. In the low state (0 V), the output transistor sinks current through the external device. In
the high state, the output transistor is off (transistor switch is open). This interrupts current flow
through the external device. Most applications use an active-low (ON = 0 V) output sense.
Figure 93: Digital IO Vext (example external circuit)
+5 V line
The digital I/O port provides a +5 V output. You can use this line to drive external logic circuitry. The
maximum current output for this line is 500 mA. A self-resetting fuse with a one-hour recovery time
protects this line.

Table of Contents

Other manuals for Keithley 2450

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Keithley 2450 and is the answer not in the manual?

Keithley 2450 Specifications

General IconGeneral
Model2450
CategorySourceMeter
Voltage Source Range±200 V
Current Source Range±1 A
DC Voltage200 V
DC Current1 A
Power Output20 W
Resolution6.5 digits
Display5-inch capacitive touchscreen
Operating Temperature0°C to 50°C
ConnectivityUSB, LAN, GPIB
Dimensions213 mm × 88 mm × 370 mm

Related product manuals